/**
 * Copyright JS Foundation and other contributors, http://js.foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 **/

RED.subflow = (function() {

    var currentLocale = "en-US";

    var _subflowEditTemplate = '<script type="text/x-red" data-template-name="subflow">'+
        '<div class="form-row">'+
            '<label for="node-input-name" data-i18n="[append]editor:common.label.name"><i class="fa fa-tag"></i> </label>'+
            '<input type="text" id="node-input-name" data-i18n="[placeholder]common.label.name">'+
        '</div>'+
        '<div id="subflow-input-ui"></div>'+
        '</script>';

    var _subflowTemplateEditTemplate = '<script type="text/x-red" data-template-name="subflow-template">'+
        '<div class="form-row">'+
            '<label for="subflow-input-name" data-i18n="[append]common.label.name"><i class="fa fa-tag"></i>  </label>'+
            '<input type="text" id="subflow-input-name" data-i18n="[placeholder]common.label.name">'+
        '</div>'+
        '<div class="form-row">'+
            '<ul style="margin-bottom: 20px;" id="subflow-env-tabs"></ul>'+
        '</div>'+
        '<div id="subflow-env-tabs-content">'+
            '<div id="subflow-env-tab-edit">'+
                '<div class="form-row node-input-env-container-row" id="subflow-input-edit-ui">'+
                    '<ol class="red-ui-editor-subflow-env-list" id="node-input-env-container"></ol>'+
                    '<div class="node-input-env-locales-row"><i class="fa fa-language"></i> <select id="subflow-input-env-locale"></select></div>'+
                '</div>'+
            '</div>'+
            '<div id="subflow-env-tab-preview">'+
                '<div id="subflow-input-ui"/>'+
            '</div>'+
        '</div>'+
        '</script>';

    var _subflowModulePaneTemplate = '<form class="dialog-form form-horizontal" autocomplete="off">'+
        '<div class="form-row">'+
            '<label for="subflow-input-module-module" data-i18n="[append]editor:subflow.module"><i class="fa fa-cube"></i> </label>'+
            '<input style="width: calc(100% - 110px)" type="text" id="subflow-input-module-module" data-i18n="[placeholder]common.label.name">'+
        '</div>'+
        '<div class="form-row">'+
            '<label for="subflow-input-module-type" data-i18n="[append]editor:subflow.type"> </label>'+
            '<input style="width: calc(100% - 110px)" type="text" id="subflow-input-module-type">'+
        '</div>'+
        '<div class="form-row">'+
            '<label for="subflow-input-module-version" data-i18n="[append]editor:subflow.version"></label>'+
            '<input style="width: calc(100% - 110px)" type="text" id="subflow-input-module-version" data-i18n="[placeholder]editor:subflow.versionPlaceholder">'+
        '</div>'+
        '<div class="form-row">'+
            '<label for="subflow-input-module-desc" data-i18n="[append]editor:subflow.desc"></label>'+
            '<input style="width: calc(100% - 110px)" type="text" id="subflow-input-module-desc">'+
        '</div>'+
        '<div class="form-row">'+
            '<label for="subflow-input-module-license" data-i18n="[append]editor:subflow.license"></label>'+
            '<input style="width: calc(100% - 110px)" type="text" id="subflow-input-module-license">'+
        '</div>'+
        '<div class="form-row">'+
            '<label for="subflow-input-module-author" data-i18n="[append]editor:subflow.author"></label>'+
            '<input style="width: calc(100% - 110px)" type="text" id="subflow-input-module-author" data-i18n="[placeholder]editor:subflow.authorPlaceholder">'+
        '</div>'+
        '<div class="form-row">'+
            '<label for="subflow-input-module-keywords" data-i18n="[append]editor:subflow.keys"></label>'+
            '<input style="width: calc(100% - 110px)" type="text" id="subflow-input-module-keywords" data-i18n="[placeholder]editor:subflow.keysPlaceholder">'+
        '</div>'+
    '</form>';

    function findAvailableSubflowIOPosition(subflow,isInput) {
        var pos = {x:50,y:30};
        if (!isInput) {
            pos.x += 110;
        }
        var ports = [].concat(subflow.out).concat(subflow.in);
        if (subflow.status) {
            ports.push(subflow.status);
        }
        ports.sort(function(A,B) {
            return A.x-B.x;
        });
        for (var i=0; i<ports.length; i++) {
            var port = ports[i];
            if (port.x == pos.x && port.y == pos.y) {
                pos.x += 55;
            }
        }
        return pos;
    }

    function addSubflowInput() {
        var subflow = RED.nodes.subflow(RED.workspaces.active());
        if (subflow.in.length === 1) {
            return;
        }
        var position = findAvailableSubflowIOPosition(subflow,true);
        var newInput = {
            type:"subflow",
            direction:"in",
            z:subflow.id,
            i:subflow.in.length,
            x:position.x,
            y:position.y,
            id:RED.nodes.id()
        };
        var oldInCount = subflow.in.length;
        subflow.in.push(newInput);
        subflow.dirty = true;
        var wasDirty = RED.nodes.dirty();
        var wasChanged = subflow.changed;
        subflow.changed = true;
        var result = refresh(true);
        var historyEvent = {
            t:'edit',
            node:subflow,
            dirty:wasDirty,
            changed:wasChanged,
            subflow: {
                inputCount: oldInCount,
                instances: result.instances
            }
        };
        RED.history.push(historyEvent);
        RED.view.select();
        RED.nodes.dirty(true);
        RED.view.redraw();
        $("#red-ui-subflow-input-add").addClass("active");
        $("#red-ui-subflow-input-remove").removeClass("active");
        RED.events.emit("subflows:change",subflow);
    }

    function removeSubflowInput() {
        var activeSubflow = RED.nodes.subflow(RED.workspaces.active());
        if (activeSubflow.in.length === 0) {
            return;
        }
        var removedInput = activeSubflow.in[0];
        var removedInputLinks = [];
        RED.nodes.eachLink(function(l) {
            if (l.source.type == "subflow" && l.source.z == activeSubflow.id && l.source.i == removedInput.i) {
                removedInputLinks.push(l);
            } else if (l.target.type == "subflow:"+activeSubflow.id) {
                removedInputLinks.push(l);
            }
        });
        removedInputLinks.forEach(function(l) { RED.nodes.removeLink(l)});
        activeSubflow.in = [];
        $("#red-ui-subflow-input-add").removeClass("active");
        $("#red-ui-subflow-input-remove").addClass("active");
        activeSubflow.changed = true;
        RED.events.emit("subflows:change",activeSubflow);
        return {subflowInputs: [ removedInput ], links:removedInputLinks};
    }

    function addSubflowOutput(id) {
        var subflow = RED.nodes.subflow(RED.workspaces.active());
        var position = findAvailableSubflowIOPosition(subflow,false);

        var newOutput = {
            type:"subflow",
            direction:"out",
            z:subflow.id,
            i:subflow.out.length,
            x:position.x,
            y:position.y,
            id:RED.nodes.id()
        };
        var oldOutCount = subflow.out.length;
        subflow.out.push(newOutput);
        subflow.dirty = true;
        var wasDirty = RED.nodes.dirty();
        var wasChanged = subflow.changed;
        subflow.changed = true;

        var result = refresh(true);

        var historyEvent = {
            t:'edit',
            node:subflow,
            dirty:wasDirty,
            changed:wasChanged,
            subflow: {
                outputCount: oldOutCount,
                instances: result.instances
            }
        };
        RED.history.push(historyEvent);
        RED.view.select();
        RED.nodes.dirty(true);
        RED.view.redraw();
        $("#red-ui-subflow-output .spinner-value").text(subflow.out.length);
        RED.events.emit("subflows:change",subflow);
    }

    function removeSubflowOutput(removedSubflowOutputs) {
        var activeSubflow = RED.nodes.subflow(RED.workspaces.active());
        if (activeSubflow.out.length === 0) {
            return;
        }
        if (typeof removedSubflowOutputs === "undefined") {
            removedSubflowOutputs = [activeSubflow.out[activeSubflow.out.length-1]];
        }
        var removedLinks = [];
        removedSubflowOutputs.sort(function(a,b) { return b.i-a.i});
        for (i=0;i<removedSubflowOutputs.length;i++) {
            var output = removedSubflowOutputs[i];
            activeSubflow.out.splice(output.i,1);
            var subflowRemovedLinks = [];
            var subflowMovedLinks = [];
            RED.nodes.eachLink(function(l) {
                if (l.target.type == "subflow" && l.target.z == activeSubflow.id && l.target.i == output.i) {
                    subflowRemovedLinks.push(l);
                }
                if (l.source.type == "subflow:"+activeSubflow.id) {
                    if (l.sourcePort == output.i) {
                        subflowRemovedLinks.push(l);
                    } else if (l.sourcePort > output.i) {
                        subflowMovedLinks.push(l);
                    }
                }
            });
            subflowRemovedLinks.forEach(function(l) { RED.nodes.removeLink(l)});
            subflowMovedLinks.forEach(function(l) { l.sourcePort--; });

            removedLinks = removedLinks.concat(subflowRemovedLinks);
            for (var j=output.i;j<activeSubflow.out.length;j++) {
                activeSubflow.out[j].i--;
                activeSubflow.out[j].dirty = true;
            }
        }
        activeSubflow.changed = true;
        RED.events.emit("subflows:change",activeSubflow);
        return {subflowOutputs: removedSubflowOutputs, links: removedLinks}
    }

    function addSubflowStatus() {
        var subflow = RED.nodes.subflow(RED.workspaces.active());
        if (subflow.status) {
            return;
        }
        var position = findAvailableSubflowIOPosition(subflow,false);
        var statusNode = {
            type:"subflow",
            direction:"status",
            z:subflow.id,
            x:position.x,
            y:position.y,
            id:RED.nodes.id()
        };
        subflow.status = statusNode;
        subflow.dirty = true;
        var wasDirty = RED.nodes.dirty();
        var wasChanged = subflow.changed;
        subflow.changed = true;
        var result = refresh(true);
        var historyEvent = {
            t:'edit',
            node:subflow,
            dirty:wasDirty,
            changed:wasChanged,
            subflow: { status: true }
        };
        RED.history.push(historyEvent);
        RED.view.select();
        RED.nodes.dirty(true);
        RED.view.redraw();
        RED.events.emit("subflows:change",subflow);
        $("#red-ui-subflow-status").prop("checked",!!subflow.status);
        $("#red-ui-subflow-status").parent().parent().toggleClass("active",!!subflow.status);
    }

    function removeSubflowStatus() {
        var subflow = RED.nodes.subflow(RED.workspaces.active());
        if (!subflow.status) {
            return;
        }
        var subflowRemovedLinks = [];
        RED.nodes.eachLink(function(l) {
            if (l.target.type == "subflow" && l.target.z == subflow.id && l.target.direction == "status") {
                subflowRemovedLinks.push(l);
            }
        });
        subflowRemovedLinks.forEach(function(l) { RED.nodes.removeLink(l)});
        delete subflow.status;

        $("#red-ui-subflow-status").prop("checked",!!subflow.status);
        $("#red-ui-subflow-status").parent().parent().toggleClass("active",!!subflow.status);

        return { links: subflowRemovedLinks }
    }

    function refresh(markChange) {
        var activeSubflow = RED.nodes.subflow(RED.workspaces.active());
        refreshToolbar(activeSubflow);
        var subflowInstances = [];
        if (activeSubflow) {
            RED.nodes.filterNodes({type:"subflow:"+activeSubflow.id}).forEach(function(n) {
                subflowInstances.push({
                    id: n.id,
                    changed: n.changed
                });
                if (markChange) {
                    n.changed = true;
                }
                n.inputs = activeSubflow.in.length;
                n.outputs = activeSubflow.out.length;
                n.resize = true;
                n.dirty = true;
                RED.editor.updateNodeProperties(n);
            });
            RED.editor.validateNode(activeSubflow);
            return {
                instances: subflowInstances
            }
        }
    }

    function refreshToolbar(activeSubflow) {
        if (activeSubflow) {
            $("#red-ui-subflow-input-add").toggleClass("active", activeSubflow.in.length !== 0);
            $("#red-ui-subflow-input-remove").toggleClass("active",activeSubflow.in.length === 0);

            $("#red-ui-subflow-output .spinner-value").text(activeSubflow.out.length);

            $("#red-ui-subflow-status").prop("checked",!!activeSubflow.status);
            $("#red-ui-subflow-status").parent().parent().toggleClass("active",!!activeSubflow.status);

        }
    }

    function showWorkspaceToolbar(activeSubflow) {
        var toolbar = $("#red-ui-workspace-toolbar");
        toolbar.empty();

        // Edit properties
        $('<a class="button" id="red-ui-subflow-edit" href="#" data-i18n="[append]subflow.editSubflowProperties"><i class="fa fa-pencil"></i> </a>').appendTo(toolbar);

        // Inputs
        $('<span style="margin-left: 5px;" data-i18n="subflow.input"></span> '+
            '<div style="display: inline-block;" class="button-group">'+
            '<a id="red-ui-subflow-input-remove" class="button active" href="#">0</a>'+
            '<a id="red-ui-subflow-input-add" class="button" href="#">1</a>'+
            '</div>').appendTo(toolbar);

        // Outputs
        $('<span style="margin-left: 5px;" data-i18n="subflow.output"></span> <div id="red-ui-subflow-output" style="display: inline-block;" class="button-group spinner-group">'+
            '<a id="red-ui-subflow-output-remove" class="button" href="#"><i class="fa fa-minus"></i></a>'+
            '<div class="spinner-value">3</div>'+
            '<a id="red-ui-subflow-output-add" class="button" href="#"><i class="fa fa-plus"></i></a>'+
            '</div>').appendTo(toolbar);

        // Status
        $('<span class="button-group"><span class="button" style="padding:0"><label for="red-ui-subflow-status"><input id="red-ui-subflow-status" type="checkbox"> <span data-i18n="subflow.status"></span></label></span></span>').appendTo(toolbar);

        // $('<a class="button disabled" id="red-ui-subflow-add-input" href="#" data-i18n="[append]subflow.input"><i class="fa fa-plus"></i> </a>').appendTo(toolbar);
        // $('<a class="button" id="red-ui-subflow-add-output" href="#" data-i18n="[append]subflow.output"><i class="fa fa-plus"></i> </a>').appendTo(toolbar);

        // Delete
        $('<a class="button" id="red-ui-subflow-delete" href="#" data-i18n="[append]subflow.deleteSubflow"><i class="fa fa-trash"></i> </a>').appendTo(toolbar);

        toolbar.i18n();


        $("#red-ui-subflow-output-remove").on("click", function(event) {
            event.preventDefault();
            var wasDirty = RED.nodes.dirty();
            var wasChanged = activeSubflow.changed;
            var result = removeSubflowOutput();
            if (result) {
                var inst = refresh(true);
                RED.history.push({
                    t:'delete',
                    links:result.links,
                    subflowOutputs: result.subflowOutputs,
                    changed: wasChanged,
                    dirty:wasDirty,
                    subflow: {
                        instances: inst.instances
                    }
                });

                RED.view.select();
                RED.nodes.dirty(true);
                RED.view.redraw(true);
            }
        });

        $("#red-ui-subflow-output-add").on("click", function(event) {
            event.preventDefault();
            addSubflowOutput();
        });

        $("#red-ui-subflow-input-add").on("click", function(event) {
            event.preventDefault();
            addSubflowInput();
        });

        $("#red-ui-subflow-input-remove").on("click", function(event) {
            event.preventDefault();
            var wasDirty = RED.nodes.dirty();
            var wasChanged = activeSubflow.changed;
            activeSubflow.changed = true;
            var result = removeSubflowInput();
            if (result) {
                var inst = refresh(true);
                RED.history.push({
                    t:'delete',
                    links:result.links,
                    changed: wasChanged,
                    subflowInputs: result.subflowInputs,
                    dirty:wasDirty,
                    subflow: {
                        instances: inst.instances
                    }
                });
                RED.view.select();
                RED.nodes.dirty(true);
                RED.view.redraw(true);
            }
        });

        $("#red-ui-subflow-status").on("change", function(evt) {
            if (this.checked) {
                addSubflowStatus();
            } else {
                var currentStatus = activeSubflow.status;
                var wasChanged = activeSubflow.changed;
                var result = removeSubflowStatus();
                if (result) {
                    activeSubflow.changed = true;
                    var wasDirty = RED.nodes.dirty();
                    RED.history.push({
                        t:'delete',
                        links:result.links,
                        changed: wasChanged,
                        dirty:wasDirty,
                        subflow: {
                            id: activeSubflow.id,
                            status: currentStatus
                        }
                    });
                    RED.view.select();
                    RED.nodes.dirty(true);
                    RED.view.redraw();
                }
            }
        })

        $("#red-ui-subflow-edit").on("click", function(event) {
            RED.editor.editSubflow(RED.nodes.subflow(RED.workspaces.active()));
            event.preventDefault();
        });

        $("#red-ui-subflow-delete").on("click", function(event) {
            event.preventDefault();
            var subflow = RED.nodes.subflow(RED.workspaces.active());
            if (subflow.instances.length > 0) {
                var msg = $('<div>')
                $('<p>').text(RED._("subflow.subflowInstances",{count: subflow.instances.length})).appendTo(msg);
                $('<p>').text(RED._("subflow.confirmDelete")).appendTo(msg);
                var confirmDeleteNotification = RED.notify(msg, {
                    modal: true,
                    fixed: true,
                    buttons: [
                        {
                            text: RED._('common.label.cancel'),
                            click: function() {
                                confirmDeleteNotification.close();
                            }
                        },
                        {
                            text: RED._('workspace.confirmDelete'),
                            class: "primary",
                            click: function() {
                                confirmDeleteNotification.close();
                                completeDelete();
                            }
                        }
                    ]
                });

                return;
            } else {
                completeDelete();
            }
            function completeDelete() {
                var startDirty = RED.nodes.dirty();
                var historyEvent = removeSubflow(RED.workspaces.active());
                historyEvent.t = 'delete';
                historyEvent.dirty = startDirty;
                RED.history.push(historyEvent);
            }

        });

        refreshToolbar(activeSubflow);

        $("#red-ui-workspace-chart").css({"margin-top": "40px"});
        $("#red-ui-workspace-toolbar").show();
    }

    function hideWorkspaceToolbar() {
        $("#red-ui-workspace-toolbar").hide().empty();
        $("#red-ui-workspace-chart").css({"margin-top": "0"});
    }

    function removeSubflow(id, keepInstanceNodes) {
        // TODO:  A lot of this logic is common with RED.nodes.removeWorkspace
        var removedNodes = [];
        var removedLinks = [];
        var removedGroups = [];

        var activeSubflow = RED.nodes.subflow(id);

        RED.nodes.eachNode(function(n) {
            if (!keepInstanceNodes && n.type == "subflow:"+id) {
                removedNodes.push(n);
            }
            if (n.z == id) {
                removedNodes.push(n);
            }
        });
        RED.nodes.eachConfig(function(n) {
            if (n.z == id) {
                removedNodes.push(n);
            }
        });
        RED.nodes.groups(id).forEach(function(n) {
            removedGroups.push(n);
        })
        var removedConfigNodes = [];
        for (var i=0;i<removedNodes.length;i++) {
            var removedEntities = RED.nodes.remove(removedNodes[i].id);
            removedLinks = removedLinks.concat(removedEntities.links);
            removedConfigNodes = removedConfigNodes.concat(removedEntities.nodes);
        }
        // TODO: this whole delete logic should be in RED.nodes.removeSubflow..
        removedNodes = removedNodes.concat(removedConfigNodes);

        removedGroups = RED.nodes.groups(id).filter(function(g) { return !g.g; });
        for (i=0;i<removedGroups.length;i++) {
            removedGroups[i].nodes.forEach(function(n) {
                if (n.type === "group") {
                    removedGroups.push(n);
                }
            });
        }
        // Now remove them in the reverse order
        for (i=removedGroups.length-1; i>=0; i--) {
            RED.nodes.removeGroup(removedGroups[i]);
        }
        RED.nodes.removeSubflow(activeSubflow);
        RED.workspaces.remove(activeSubflow);
        RED.nodes.dirty(true);
        RED.view.redraw();

        return {
            nodes:removedNodes,
            links:removedLinks,
            groups: removedGroups,
            subflows: [activeSubflow]
        }
    }

    function init() {
        RED.events.on("workspace:change",function(event) {
            var activeSubflow = RED.nodes.subflow(event.workspace);
            if (activeSubflow) {
                showWorkspaceToolbar(activeSubflow);
            } else {
                hideWorkspaceToolbar();
            }
        });
        RED.events.on("view:selection-changed",function(selection) {
            if (!selection.nodes) {
                RED.menu.setDisabled("menu-item-subflow-convert",true);
            } else {
                RED.menu.setDisabled("menu-item-subflow-convert",false);
            }
        });

        RED.actions.add("core:create-subflow",createSubflow);
        RED.actions.add("core:convert-to-subflow",convertToSubflow);

        $(_subflowEditTemplate).appendTo("#red-ui-editor-node-configs");
        $(_subflowTemplateEditTemplate).appendTo("#red-ui-editor-node-configs");

    }

    function createSubflow() {
        var lastIndex = 0;
        RED.nodes.eachSubflow(function(sf) {
           var m = (new RegExp("^Subflow (\\d+)$")).exec(sf.name);
           if (m) {
               lastIndex = Math.max(lastIndex,m[1]);
           }
        });

        var name = "Subflow "+(lastIndex+1);

        var subflowId = RED.nodes.id();
        var subflow = {
            type:"subflow",
            id:subflowId,
            name:name,
            info:"",
            in: [],
            out: []
        };
        RED.nodes.addSubflow(subflow);
        RED.history.push({
            t:'createSubflow',
            subflow: {
                subflow:subflow
            },
            dirty:RED.nodes.dirty()
        });
        RED.workspaces.show(subflowId);
        RED.nodes.dirty(true);
    }

    function snapToGrid(x) {
        if (RED.settings.get("editor").view['view-snap-grid']) {
            x = Math.round(x / RED.view.gridSize()) * RED.view.gridSize();
        }
        return x;
    }

    function convertToSubflow() {
        var selection = RED.view.selection();
        if (!selection.nodes) {
            RED.notify(RED._("subflow.errors.noNodesSelected"),"error");
            return;
        }
        var i,n;
        var nodeList = new Set();
        var tmplist = selection.nodes.slice();
        var includedGroups = new Set();
        while(tmplist.length > 0) {
            n = tmplist.shift();
            if (n.type === "group") {
                includedGroups.add(n.id);
                tmplist = tmplist.concat(n.nodes);
            }
            nodeList.add(n);
        }

        nodeList = Array.from(nodeList);

        var containingGroup = nodeList[0].g;
        var nodesMovedFromGroup = [];

        for (i=0; i<nodeList.length;i++) {
            if (nodeList[i].g && !includedGroups.has(nodeList[i].g)) {
                if (containingGroup !== nodeList[i].g) {
                    RED.notify("Cannot create subflow across multiple groups","error");
                    return;
                }
            }
        }
        if (containingGroup) {
            containingGroup = RED.nodes.group(containingGroup);
        }
        var nodes = {};
        var new_links = [];
        var removedLinks = [];

        var candidateInputs = [];
        var candidateOutputs = [];
        var candidateInputNodes = {};

        var boundingBox = [nodeList[0].x,
            nodeList[0].y,
            nodeList[0].x,
            nodeList[0].y];

        for (i=0;i<nodeList.length;i++) {
            n = nodeList[i];
            nodes[n.id] = {n:n,outputs:{}};
            boundingBox = [
                Math.min(boundingBox[0],n.x),
                Math.min(boundingBox[1],n.y),
                Math.max(boundingBox[2],n.x),
                Math.max(boundingBox[3],n.y)
            ]
        }
        var offsetX = snapToGrid(boundingBox[0] - 200);
        var offsetY = snapToGrid(boundingBox[1] - 80);


        var center = [
            snapToGrid((boundingBox[2]+boundingBox[0]) / 2),
            snapToGrid((boundingBox[3]+boundingBox[1]) / 2)
        ];

        RED.nodes.eachLink(function(link) {
            if (nodes[link.source.id] && nodes[link.target.id]) {
                // A link wholely within the selection
            }

            if (nodes[link.source.id] && !nodes[link.target.id]) {
                // An outbound link from the selection
                candidateOutputs.push(link);
                removedLinks.push(link);
            }
            if (!nodes[link.source.id] && nodes[link.target.id]) {
                // An inbound link
                candidateInputs.push(link);
                candidateInputNodes[link.target.id] = link.target;
                removedLinks.push(link);
            }
        });

        var outputs = {};
        candidateOutputs = candidateOutputs.filter(function(v) {
             if (outputs[v.source.id+":"+v.sourcePort]) {
                 outputs[v.source.id+":"+v.sourcePort].targets.push(v.target);
                 return false;
             }
             v.targets = [];
             v.targets.push(v.target);
             outputs[v.source.id+":"+v.sourcePort] = v;
             return true;
        });
        candidateOutputs.sort(function(a,b) { return a.source.y-b.source.y});

        if (Object.keys(candidateInputNodes).length > 1) {
             RED.notify(RED._("subflow.errors.multipleInputsToSelection"),"error");
             return;
        }

        var lastIndex = 0;
        RED.nodes.eachSubflow(function(sf) {
           var m = (new RegExp("^Subflow (\\d+)$")).exec(sf.name);
           if (m) {
               lastIndex = Math.max(lastIndex,m[1]);
           }
        });

        var name = "Subflow "+(lastIndex+1);

        var subflowId = RED.nodes.id();
        var subflow = {
            type:"subflow",
            id:subflowId,
            name:name,
            info:"",
            in: Object.keys(candidateInputNodes).map(function(v,i) { var index = i; return {
                type:"subflow",
                direction:"in",
                x:snapToGrid(candidateInputNodes[v].x-(candidateInputNodes[v].w/2)-80 - offsetX),
                y:snapToGrid(candidateInputNodes[v].y - offsetY),
                z:subflowId,
                i:index,
                id:RED.nodes.id(),
                wires:[{id:candidateInputNodes[v].id}]
            }}),
            out: candidateOutputs.map(function(v,i) { var index = i; return {
                type:"subflow",
                direction:"out",
                x:snapToGrid(v.source.x+(v.source.w/2)+80 - offsetX),
                y:snapToGrid(v.source.y - offsetY),
                z:subflowId,
                i:index,
                id:RED.nodes.id(),
                wires:[{id:v.source.id,port:v.sourcePort}]
            }})
        };

        RED.nodes.addSubflow(subflow);

        var subflowInstance = {
            id:RED.nodes.id(),
            type:"subflow:"+subflow.id,
            x: center[0],
            y: center[1],
            z: RED.workspaces.active(),
            inputs: subflow.in.length,
            outputs: subflow.out.length,
            h: Math.max(30/*node_height*/,(subflow.out.length||0) * 15),
            changed:true
        }
        subflowInstance._def = RED.nodes.getType(subflowInstance.type);
        RED.editor.validateNode(subflowInstance);
        RED.nodes.add(subflowInstance);

        if (containingGroup) {
            RED.group.addToGroup(containingGroup, subflowInstance);
            nodeList.forEach(function(nl) {
                if (nl.g === containingGroup.id) {
                    delete nl.g;
                    var index = containingGroup.nodes.indexOf(nl);
                    containingGroup.nodes.splice(index,1);
                    nodesMovedFromGroup.push(nl);
                }
            })
            containingGroup.dirty = true;
        }


        candidateInputs.forEach(function(l) {
            var link = {source:l.source, sourcePort:l.sourcePort, target: subflowInstance};
            new_links.push(link);
            RED.nodes.addLink(link);
        });

        candidateOutputs.forEach(function(output,i) {
            output.targets.forEach(function(target) {
                var link = {source:subflowInstance, sourcePort:i, target: target};
                new_links.push(link);
                RED.nodes.addLink(link);
            });
        });

        subflow.in.forEach(function(input) {
            input.wires.forEach(function(wire) {
                var link = {source: input, sourcePort: 0, target: RED.nodes.node(wire.id) }
                new_links.push(link);
                RED.nodes.addLink(link);
            });
        });
        subflow.out.forEach(function(output,i) {
            output.wires.forEach(function(wire) {
                var link = {source: RED.nodes.node(wire.id), sourcePort: wire.port , target: output }
                new_links.push(link);
                RED.nodes.addLink(link);
            });
        });

        for (i=0;i<removedLinks.length;i++) {
            RED.nodes.removeLink(removedLinks[i]);
        }

        for (i=0;i<nodeList.length;i++) {
            n = nodeList[i];
            if (/^link /.test(n.type)) {
                n.links = n.links.filter(function(id) {
                    var isLocalLink = nodes.hasOwnProperty(id);
                    if (!isLocalLink) {
                        var otherNode = RED.nodes.node(id);
                        if (otherNode && otherNode.links) {
                            var i = otherNode.links.indexOf(n.id);
                            if (i > -1) {
                                otherNode.links.splice(i,1);
                            }
                        }
                    }
                    return isLocalLink;
                });
            }
            n.x -= offsetX;
            n.y -= offsetY;
            RED.nodes.moveNodeToTab(n, subflow.id);
        }


        var historyEvent = {
            t:'createSubflow',
            nodes:[subflowInstance.id],
            links:new_links,
            subflow: {
                subflow: subflow,
                offsetX: offsetX,
                offsetY: offsetY
            },

            activeWorkspace: RED.workspaces.active(),
            removedLinks: removedLinks,

            dirty:RED.nodes.dirty()
        }
        if (containingGroup) {
            historyEvent = {
                t:'multi',
                events: [ historyEvent ]
            }
            historyEvent.events.push({
                t:'addToGroup',
                group: containingGroup,
                nodes: [subflowInstance]
            })
            historyEvent.events.push({
                t:'removeFromGroup',
                group: containingGroup,
                nodes: nodesMovedFromGroup,
                reparent: false
            })
        }
        RED.history.push(historyEvent);
        RED.editor.validateNode(subflow);
        RED.nodes.dirty(true);
        RED.view.updateActive();
        RED.view.select(null);
    }


    /**
     * Create interface for controlling env var UI definition
     */
    function buildEnvControl(envList,node) {

        var tabs = RED.tabs.create({
            id: "subflow-env-tabs",
            onchange: function(tab) {
                if (tab.id === "subflow-env-tab-preview") {
                    var inputContainer = $("#subflow-input-ui");
                    var list = envList.editableList("items");
                    var exportedEnv = exportEnvList(list, true);
                    buildEnvUI(inputContainer, exportedEnv,node);
                }
                $("#subflow-env-tabs-content").children().hide();
                $("#" + tab.id).show();
            }
        });
        tabs.addTab({
            id: "subflow-env-tab-edit",
            label: RED._("editor-tab.envProperties")
        });
        tabs.addTab({
            id: "subflow-env-tab-preview",
            label:  RED._("editor-tab.preview")
        });

        var localesList = RED.settings.theme("languages")
            .map(function(lc) { var name = RED._("languages."+lc); return {text: (name ? name : lc), val: lc}; })
            .sort(function(a, b) { return a.text.localeCompare(b.text) });
        RED.popover.tooltip($(".node-input-env-locales-row i"),RED._("editor.locale"))
        var locales = $("#subflow-input-env-locale")
        localesList.forEach(function(item) {
            var opt = {
                value: item.val
            };
            if (item.val === "en-US") { // make en-US default selected
                opt.selected = "";
            }
            $("<option/>", opt).text(item.text).appendTo(locales);
        });
        var locale = RED.i18n.lang();
        locales.val(locale);

        locales.on("change", function() {
            currentLocale = $(this).val();
            var items = $("#node-input-env-container").editableList("items");
            items.each(function (i, item) {
                var entry = $(this).data('data');
                var labelField = entry.ui.labelField;
                labelField.val(lookupLabel(entry.ui.label, "", currentLocale));
                if (labelField.timeout) {
                    clearTimeout(labelField.timeout);
                    delete labelField.timeout;
                }
                labelField.addClass("input-updated");
                labelField.timeout = setTimeout(function() {
                    delete labelField.timeout
                    labelField.removeClass("input-updated");
                },3000);
            });
        });
    }

    var DEFAULT_ENV_TYPE_LIST = ['str','num','bool','json','bin','env'];
    var DEFAULT_ENV_TYPE_LIST_INC_CRED = ['str','num','bool','json','bin','env','cred'];

    /**
     * Create env var edit interface
     * @param container - container
     * @param node - subflow node
     */
    function buildPropertiesList(envContainer, node) {

        var isTemplateNode = (node.type === "subflow");

        if (isTemplateNode) {
            buildEnvControl(envContainer, node);
        }
        envContainer
            .css({
                'min-height':'150px',
                'min-width':'450px'
            })
            .editableList({
                header: isTemplateNode?$('<div><div><div></div><div data-i18n="common.label.name"></div><div data-i18n="editor-tab.defaultValue"></div><div></div></div></div>'):undefined,
                addItem: function(container, i, opt) {
                    // If this is an instance node, these are properties unique to
                    // this instance - ie opt.parent will not be defined.

                    if (isTemplateNode) {
                        container.addClass("red-ui-editor-subflow-env-editable")
                    }

                    var envRow = $('<div/>').appendTo(container);
                    var nameField = null;
                    var valueField = null;

                    nameField = $('<input/>', {
                        class: "node-input-env-name",
                        type: "text",
                        placeholder: RED._("common.label.name")
                    }).attr("autocomplete","disable").appendTo(envRow).val(opt.name);
                    valueField = $('<input/>',{
                        style: "width:100%",
                        class: "node-input-env-value",
                        type: "text",
                    }).attr("autocomplete","disable").appendTo(envRow)
                    valueField.typedInput({default:'str',types:isTemplateNode?DEFAULT_ENV_TYPE_LIST:DEFAULT_ENV_TYPE_LIST_INC_CRED});
                    valueField.typedInput('type', opt.type);
                    if (opt.type === "cred") {
                        if (opt.value) {
                            valueField.typedInput('value', opt.value);
                        } else if (node.credentials && node.credentials[opt.name]) {
                            valueField.typedInput('value', node.credentials[opt.name]);
                        } else if (node.credentials && node.credentials['has_'+opt.name]) {
                            valueField.typedInput('value', "__PWRD__");
                        } else {
                            valueField.typedInput('value', "");
                        }
                    } else {
                        valueField.typedInput('value', opt.value);
                    }


                    opt.nameField = nameField;
                    opt.valueField = valueField;

                    var actionButton = $('<a/>',{href:"#",class:"red-ui-editableList-item-remove red-ui-button red-ui-button-small"}).appendTo(envRow);
                    $('<i/>',{class:"fa "+(opt.parent?"fa-reply":"fa-remove")}).appendTo(actionButton);
                    var removeTip = RED.popover.tooltip(actionButton,RED._("subflow.env.remove"));
                    actionButton.on("click", function(evt) {
                        evt.preventDefault();
                        removeTip.close();
                        container.parent().addClass("red-ui-editableList-item-deleting")
                        container.fadeOut(300, function() {
                            envContainer.editableList('removeItem',opt);
                        });
                    });

                    if (isTemplateNode) {
                        // Add the UI customisation row
                        // if `opt.ui` does not exist, then apply defaults. If these
                        // defaults do not change then they will get stripped off
                        // before saving.
                        if (opt.type === 'cred') {
                            opt.ui = opt.ui || {
                                icon: "",
                                type: "cred"
                            }
                            opt.ui.type = "cred";
                        } else {
                            opt.ui = opt.ui || {
                                icon: "",
                                type: "input",
                                opts: {types:DEFAULT_ENV_TYPE_LIST}
                            }
                        }
                        opt.ui.label = opt.ui.label || {};
                        opt.ui.type = opt.ui.type || "input";

                        var uiRow = $('<div/>').appendTo(container).hide();
                        // save current info for reverting on cancel
                        // var copy = $.extend(true, {}, ui);

                         $('<a href="#"><i class="fa fa-angle-right"></a>').prependTo(envRow).on("click", function (evt) {
                            evt.preventDefault();
                            if ($(this).hasClass('expanded')) {
                                uiRow.slideUp();
                                $(this).removeClass('expanded');
                            } else {
                                uiRow.slideDown();
                                $(this).addClass('expanded');
                            }
                        });

                        buildEnvEditRow(uiRow, opt.ui, nameField, valueField);
                        nameField.trigger('change');
                    }
                },
                sortable: ".red-ui-editableList-item-handle",
                removable: false
            });
        var parentEnv = {};
        var envList = [];
        if (/^subflow:/.test(node.type)) {
            var subflowDef = RED.nodes.subflow(node.type.substring(8));
            if (subflowDef.env) {
                subflowDef.env.forEach(function(env) {
                    var item = {
                        name:env.name,
                        parent: {
                            type: env.type,
                            value: env.value,
                            ui: env.ui
                        }
                    }
                    envList.push(item);
                    parentEnv[env.name] = item;
                })
            }
        }

        if (node.env) {
            for (var i = 0; i < node.env.length; i++) {
                var env = node.env[i];
                if (parentEnv.hasOwnProperty(env.name)) {
                    parentEnv[env.name].type = env.type;
                    parentEnv[env.name].value = env.value;
                } else {
                    envList.push({
                        name: env.name,
                        type: env.type,
                        value: env.value,
                        ui: env.ui
                    });
                }
            }
        }
        envList.forEach(function(env) {
            if (env.parent && env.parent.ui && env.parent.ui.type === 'hide') {
                return;
            }
            if (!isTemplateNode && env.parent) {
                return;
            }
            envContainer.editableList('addItem', JSON.parse(JSON.stringify(env)));
        });
    }

    /**
     * Create UI edit interface for environment variable
     * @param container - container
     * @param env - env var definition
     * @param nameField - name field of env var
     * @param valueField - value field of env var
     */
     function buildEnvEditRow(container, ui, nameField, valueField) {
         container.addClass("red-ui-editor-subflow-env-ui-row")
         var topRow = $('<div></div>').appendTo(container);
         $('<div></div>').appendTo(topRow);
         $('<div>').text(RED._("editor.icon")).appendTo(topRow);
         $('<div>').text(RED._("editor.label")).appendTo(topRow);
         $('<div>').text(RED._("editor.inputType")).appendTo(topRow);

         var row = $('<div></div>').appendTo(container);
         $('<div><i class="red-ui-editableList-item-handle fa fa-bars"></i></div>').appendTo(row);
         var typeOptions = {
             'input': {types:DEFAULT_ENV_TYPE_LIST},
             'select': {opts:[]},
             'spinner': {},
             'cred': {}
         };
         if (ui.opts) {
             typeOptions[ui.type] = ui.opts;
         } else {
             // Pick up the default values if not otherwise provided
             ui.opts = typeOptions[ui.type];
         }
         var iconCell = $('<div></div>').appendTo(row);

         var iconButton = $('<a href="#"></a>').appendTo(iconCell);
         iconButton.on("click", function(evt) {
             evt.preventDefault();
             var icon = ui.icon || "";
             var iconPath = (icon ? RED.utils.separateIconPath(icon) : {});
             RED.editor.showIconPicker(iconButton, null, iconPath, true, function (newIcon) {
                 iconButton.empty();
                 var path = newIcon || "";
                 var newPath = RED.utils.separateIconPath(path);
                 if (newPath) {
                     $('<i class="fa"></i>').addClass(newPath.file).appendTo(iconButton);
                 }
                 ui.icon = path;
             });
         })

         if (ui.icon) {
             var newPath = RED.utils.separateIconPath(ui.icon);
             $('<i class="fa '+newPath.file+'"></i>').appendTo(iconButton);
         }

         var labelCell = $('<div></div>').appendTo(row);

         var label = ui.label && ui.label[currentLocale] || "";
         var labelInput = $('<input type="text">').val(label).appendTo(labelCell);
         ui.labelField = labelInput;
         labelInput.on('change', function(evt) {
             ui.label = ui.label || {};
             var val = $(this).val().trim();
             if (val === "") {
                 delete ui.label[currentLocale];
             } else {
                 ui.label[currentLocale] = val;
             }
         })
         var labelIcon = $('<span class="red-ui-editor-subflow-env-lang-icon"><i class="fa fa-language"></i></span>').appendTo(labelCell);
         RED.popover.tooltip(labelIcon,function() {
             var langs = Object.keys(ui.label);
             var content = $("<div>");
             if (langs.indexOf(currentLocale) === -1) {
                 langs.push(currentLocale);
                 langs.sort();
             }
             langs.forEach(function(l) {
                 var row = $('<div>').appendTo(content);
                 $('<span>').css({display:"inline-block",width:"120px"}).text(RED._("languages."+l)+(l===currentLocale?"*":"")).appendTo(row);
                 $('<span>').text(ui.label[l]||"").appendTo(row);
             });
             return content;
         })

         nameField.on('change',function(evt) {
            labelInput.attr("placeholder",$(this).val())
        });

        var inputCell = $('<div></div>').appendTo(row);
        var inputCellInput = $('<input type="text">').css("width","100%").appendTo(inputCell);
        if (ui.type === "input") {
            inputCellInput.val(ui.opts.types.join(","));
        }
        var checkbox;
        var selectBox;

        inputCellInput.typedInput({
            types: [
                {
                    value:"input",
                    label:RED._("editor.inputs.input"), icon:"fa fa-i-cursor",showLabel:false,multiple:true,options:[
                        {value:"str",label:RED._("editor.types.str"),icon:"red/images/typedInput/az.svg"},
                        {value:"num",label:RED._("editor.types.num"),icon:"red/images/typedInput/09.svg"},
                        {value:"bool",label:RED._("editor.types.bool"),icon:"red/images/typedInput/bool.svg"},
                        {value:"json",label:RED._("editor.types.json"),icon:"red/images/typedInput/json.svg"},
                        {value: "bin",label: RED._("editor.types.bin"),icon: "red/images/typedInput/bin.svg"},
                        {value: "env",label: RED._("editor.types.env"),icon: "red/images/typedInput/env.svg"},
                        {value: "cred",label: RED._("editor.types.cred"),icon: "fa fa-lock"}
                    ],
                    default: DEFAULT_ENV_TYPE_LIST,
                    valueLabel: function(container,value) {
                        container.css("padding",0);
                        var innerContainer = $('<div class="red-ui-editor-subflow-env-input-type"></div>').appendTo(container);

                        var input = $('<div class="placeholder-input">').appendTo(innerContainer);
                        $('<span><i class="fa fa-i-cursor"></i></span>').appendTo(input);
                        if (value.length) {
                            value.forEach(function(v) {
                                if (!/^fa /.test(v.icon)) {
                                    $('<img>',{src:v.icon,style:"max-width:14px; padding: 0 3px; margin-top:-4px; margin-left: 1px"}).appendTo(input);
                                } else {
                                    var s = $('<span>',{style:"max-width:14px; padding: 0 3px; margin-top:-4px; margin-left: 1px"}).appendTo(input);
                                    $("<i>",{class: v.icon}).appendTo(s);
                                }
                            })
                        } else {
                            $('<span class="red-ui-editor-subflow-env-input-type-placeholder"></span>').text(RED._("editor.selectType")).appendTo(input);
                        }
                    }
                },
                {
                    value: "cred",
                    label: RED._("typedInput.type.cred"), icon:"fa fa-lock", showLabel: false,
                    valueLabel: function(container,value) {
                        container.css("padding",0);
                        var innerContainer = $('<div class="red-ui-editor-subflow-env-input-type">').css({
                            "border-top-right-radius": "4px",
                            "border-bottom-right-radius": "4px"
                        }).appendTo(container);
                        $('<div class="placeholder-input">').html("&bull;&bull;&bull;&bull;&bull;&bull;&bull;&bull;").appendTo(innerContainer);
                    }
                },
                {
                    value:"select",
                    label:RED._("editor.inputs.select"), icon:"fa fa-tasks",showLabel:false,
                    valueLabel: function(container,value) {
                        container.css("padding","0");

                        selectBox = $('<select></select>').appendTo(container);
                        if (ui.opts && Array.isArray(ui.opts.opts)) {
                            ui.opts.opts.forEach(function(o) {
                                var label = lookupLabel(o.l, o.l["en-US"]||o.v, currentLocale);
                                // $('<option>').val((o.t||'str')+":"+o.v).text(label).appendTo(selectBox);
                                $('<option>').val(o.v).text(label).appendTo(selectBox);
                            })
                        }
                        selectBox.on('change', function(evt) {
                            var v = selectBox.val();
                            // var parts = v.split(":");
                            // var t = parts.shift();
                            // v = parts.join(":");
                            //
                            // valueField.typedInput("type",'str')
                            valueField.typedInput("value",v)
                        });
                        selectBox.val(valueField.typedInput("value"));
                        // selectBox.val(valueField.typedInput('type')+":"+valueField.typedInput("value"));
                    },
                    expand: {
                        icon: "fa-caret-down",
                        minWidth: 400,
                        content: function(container) {
                            var content = $('<div class="red-ui-editor-subflow-ui-edit-panel">').appendTo(container);
                            var optList = $('<ol>').appendTo(content).editableList({
                                header:$("<div><div>"+RED._("editor.select.label")+"</div><div>"+RED._("editor.select.value")+"</div></div>"),
                                addItem: function(row,index,itemData) {
                                    var labelDiv = $('<div>').appendTo(row);
                                    var label = lookupLabel(itemData.l, "", currentLocale);
                                    itemData.label = $('<input type="text">').val(label).appendTo(labelDiv);
                                    itemData.label.on('keydown', function(evt) {
                                        if (evt.keyCode === 13) {
                                            itemData.input.focus();
                                            evt.preventDefault();
                                        }
                                    });
                                    var labelIcon = $('<span class="red-ui-editor-subflow-env-lang-icon"><i class="fa fa-language"></i></span>').appendTo(labelDiv);
                                    RED.popover.tooltip(labelIcon,function() {
                                        return currentLocale;
                                    })
                                    itemData.input = $('<input type="text">').val(itemData.v).appendTo(row);

                                    // Problem using a TI here:
                                    //  - this is in a popout panel
                                    //  - clicking the expand button in the TI will close the parent edit tray
                                    //    and open the type editor.
                                    //  - but it leaves the popout panel over the top.
                                    //  - there is no way to get back to the popout panel after closing the type editor
                                    //.typedInput({default:itemData.t||'str', types:DEFAULT_ENV_TYPE_LIST});
                                    itemData.input.on('keydown', function(evt) {
                                        if (evt.keyCode === 13) {
                                            // Enter or Tab
                                            var index = optList.editableList('indexOf',itemData);
                                            var length = optList.editableList('length');
                                            if (index + 1 === length) {
                                                var newItem = {};
                                                optList.editableList('addItem',newItem);
                                                setTimeout(function() {
                                                    if (newItem.label) {
                                                        newItem.label.focus();
                                                    }
                                                },100)
                                            } else {
                                                var nextItem = optList.editableList('getItemAt',index+1);
                                                if (nextItem.label) {
                                                    nextItem.label.focus()
                                                }
                                            }
                                            evt.preventDefault();
                                        }
                                    });
                                },
                                sortable: true,
                                removable: true,
                                height: 160
                            })
                            if (ui.opts.opts.length > 0) {
                                ui.opts.opts.forEach(function(o) {
                                    optList.editableList('addItem',$.extend(true,{},o))
                                })
                            } else {
                                optList.editableList('addItem',{})
                            }
                            return {
                                onclose: function() {
                                    var items = optList.editableList('items');
                                    var vals = [];
                                    items.each(function (i,el) {
                                        var data = el.data('data');
                                        var l = data.label.val().trim();
                                        var v = data.input.val();
                                        // var t = data.input.typedInput('type');
                                        // var v = data.input.typedInput('value');
                                        if (l.length > 0) {
                                            data.l = data.l || {};
                                            data.l[currentLocale] = l;
                                        }
                                        data.v = v;

                                        if (l.length > 0 || v.length > 0) {
                                            var val = {l:data.l,v:data.v};
                                            // if (t !== 'str') {
                                            //     val.t = t;
                                            // }
                                            vals.push(val);
                                        }
                                    });
                                    ui.opts.opts = vals;
                                    inputCellInput.typedInput('value',Date.now())
                                }
                            }
                        }
                    }
                },
                {
                    value:"checkbox",
                    label:RED._("editor.inputs.checkbox"), icon:"fa fa-check-square-o",showLabel:false,
                    valueLabel: function(container,value) {
                        container.css("padding",0);
                        checkbox = $('<input type="checkbox">').appendTo(container);
                        checkbox.on('change', function(evt) {
                            valueField.typedInput('value',$(this).prop('checked')?"true":"false");
                        })
                        checkbox.prop('checked',valueField.typedInput('value')==="true");
                    }
                },
                {
                    value:"spinner",
                    label:RED._("editor.inputs.spinner"), icon:"fa fa-sort-numeric-asc", showLabel:false,
                    valueLabel: function(container,value) {
                        container.css("padding",0);
                        var innerContainer = $('<div class="red-ui-editor-subflow-env-input-type"></div>').appendTo(container);

                        var input = $('<div class="placeholder-input">').appendTo(innerContainer);
                        $('<span><i class="fa fa-sort-numeric-asc"></i></span>').appendTo(input);

                        var min = ui.opts && ui.opts.min;
                        var max = ui.opts && ui.opts.max;
                        var label = "";
                        if (min !== undefined && max !== undefined) {
                            label = Math.min(min,max)+" - "+Math.max(min,max);
                        } else if (min !== undefined) {
                            label = "> "+min;
                        } else if (max !== undefined) {
                            label = "< "+max;
                        }
                        $('<span>').css("margin-left","15px").text(label).appendTo(input);
                    },
                    expand: {
                        icon: "fa-caret-down",
                        content: function(container) {
                            var content = $('<div class="red-ui-editor-subflow-ui-edit-panel">').appendTo(container);
                            content.css("padding","8px 5px")
                            var min = ui.opts.min;
                            var max = ui.opts.max;
                            var minInput = $('<input type="number" style="margin-bottom:0; width:60px">');
                            minInput.val(min);
                            var maxInput = $('<input type="number" style="margin-bottom:0; width:60px">');
                            maxInput.val(max);
                            $('<div class="form-row" style="margin-bottom:3px"><label>'+RED._("editor.spinner.min")+'</label></div>').append(minInput).appendTo(content);
                            $('<div class="form-row" style="margin-bottom:0"><label>'+RED._("editor.spinner.max")+'</label></div>').append(maxInput).appendTo(content);
                            return {
                                onclose: function() {
                                    var min = minInput.val().trim();
                                    var max = maxInput.val().trim();
                                    if (min !== "") {
                                        ui.opts.min = parseInt(min);
                                    } else {
                                        delete ui.opts.min;
                                    }
                                    if (max !== "") {
                                        ui.opts.max = parseInt(max);
                                    } else {
                                        delete ui.opts.max;
                                    }
                                    inputCellInput.typedInput('value',Date.now())
                                }
                            }
                        }
                    }
                },
                {
                    value:"none",
                    label:RED._("editor.inputs.none"), icon:"fa fa-times",hasValue:false
                },
                {
                    value:"hide",
                    label:RED._("editor.inputs.hidden"), icon:"fa fa-ban",hasValue:false
                }
            ],
            default: 'none'
        }).on("typedinputtypechange", function(evt,type) {
            ui.type = $(this).typedInput("type");
            ui.opts = typeOptions[ui.type];
            if (ui.type === 'input') {
                // In the case of 'input' type, the typedInput uses the multiple-option
                // mode. Its value needs to be set to a comma-separately list of the
                // selected options.
                inputCellInput.typedInput('value',ui.opts.types.join(","))
            } else {
                // No other type cares about `value`, but doing this will
                // force a refresh of the label now that `ui.opts` has
                // been updated.
                inputCellInput.typedInput('value',Date.now())
            }

            switch (ui.type) {
                case 'input':
                    valueField.typedInput('types',ui.opts.types);
                    break;
                case 'select':
                    valueField.typedInput('types',['str']);
                    break;
                case 'checkbox':
                    valueField.typedInput('types',['bool']);
                    break;
                case 'spinner':
                    valueField.typedInput('types',['num']);
                    break;
                case 'cred':
                    valueField.typedInput('types',['cred']);
                    break;
                default:
                    valueField.typedInput('types',DEFAULT_ENV_TYPE_LIST)
            }
            if (ui.type === 'checkbox') {
                valueField.typedInput('type','bool');
            } else if (ui.type === 'spinner') {
                valueField.typedInput('type','num');
            }
            if (ui.type !== 'checkbox') {
                checkbox = null;
            }

        }).on("change", function(evt,type) {
            if (ui.type === 'input') {
                var types = inputCellInput.typedInput('value');
                ui.opts.types = (types === "") ? ["str"] : types.split(",");
                valueField.typedInput('types',ui.opts.types);
            }
        });
        valueField.on("change", function(evt) {
            if (checkbox) {
                checkbox.prop('checked',$(this).typedInput('value')==="true")
            }
        })
        // Set the input to the right type. This will trigger the 'typedinputtypechange'
        // event handler (just above ^^) to update the value if needed
        inputCellInput.typedInput('type',ui.type)
    }

    function buildEnvUIRow(row, tenv, ui, node) {
        ui.label = ui.label||{};
        if ((tenv.type === "cred" || (tenv.parent && tenv.parent.type === "cred")) && !ui.type) {
            ui.type = "cred";
            ui.opts = {};
        } else if (!ui.type) {
            ui.type = "input";
            ui.opts = {types:DEFAULT_ENV_TYPE_LIST}
        } else {
            if (!ui.opts) {
                ui.opts = (ui.type === "select") ? {opts:[]} : {};
            }
        }

        var labels = ui.label || {};
        var locale = RED.i18n.lang();
        var labelText = lookupLabel(labels, labels["en-US"]||tenv.name, locale);
        var label = $('<label>').appendTo(row);
        $('<span>&nbsp;</span>').appendTo(row);
        var labelContainer = $('<span></span>').appendTo(label);
        if (ui.icon) {
            var newPath = RED.utils.separateIconPath(ui.icon);
            if (newPath) {
                $("<i class='fa "+newPath.file +"'/>").appendTo(labelContainer);
            }
        }
        if (ui.type !== "checkbox") {
            var css = ui.icon ? {"padding-left":"5px"} : {};
            $('<span>').css(css).text(labelText).appendTo(label);
            if (ui.type === 'none') {
                label.width('100%');
            }
        }
        var input;
        var val = {
            value: "",
            type: "str"
        };
        if (tenv.parent) {
            val.value = tenv.parent.value;
            val.type = tenv.parent.type;
        }
        if (tenv.hasOwnProperty('value')) {
            val.value = tenv.value;
        }
        if (tenv.hasOwnProperty('type')) {
            val.type = tenv.type;
        }
        switch(ui.type) {
            case "input":
                input = $('<input type="text">').css('width','70%').appendTo(row);
                if (ui.opts.types && ui.opts.types.length > 0) {
                    var inputType = val.type;
                    if (ui.opts.types.indexOf(inputType) === -1) {
                        inputType = ui.opts.types[0]
                    }
                    input.typedInput({
                        types: ui.opts.types,
                        default: inputType
                    })
                    input.typedInput('value',val.value)
                } else {
                    input.val(val.value)
                }
                break;
            case "select":
                input = $('<select>').css('width','70%').appendTo(row);
                if (ui.opts.opts) {
                    ui.opts.opts.forEach(function(o) {
                        $('<option>').val(o.v).text(lookupLabel(o.l, o.l['en-US']||o.v, locale)).appendTo(input);
                    })
                }
                input.val(val.value);
                break;
            case "checkbox":
                label.css("cursor","default");
                var cblabel = $('<label>').css('width','70%').appendTo(row);
                input = $('<input type="checkbox">').css({
                    marginTop: 0,
                    width: 'auto',
                    height: '34px'
                }).appendTo(cblabel);
                labelContainer.css({"padding-left":"5px"}).appendTo(cblabel);
                $('<span>').css({"padding-left":"5px"}).text(labelText).appendTo(cblabel);
                var boolVal = false;
                if (val.type === 'bool') {
                    boolVal = val.value === 'true'
                } else if (val.type === 'num') {
                    boolVal = val.value !== "0"
                } else {
                    boolVal = val.value !== ""
                }
                input.prop("checked",boolVal);
                break;
            case "spinner":
                input = $('<input>').css('width','70%').appendTo(row);
                var spinnerOpts = {};
                if (ui.opts.hasOwnProperty('min')) {
                    spinnerOpts.min = ui.opts.min;
                }
                if (ui.opts.hasOwnProperty('max')) {
                    spinnerOpts.max = ui.opts.max;
                }
                input.spinner(spinnerOpts).parent().width('70%');
                input.val(val.value);
                break;
            case "cred":
                input = $('<input type="password">').css('width','70%').appendTo(row);
                if (node.credentials) {
                    if (node.credentials[tenv.name]) {
                        input.val(node.credentials[tenv.name]);
                    } else if (node.credentials['has_'+tenv.name]) {
                        input.val("__PWRD__")
                    } else {
                        input.val("");
                    }
                } else {
                    input.val("");
                }
                input.typedInput({
                    types: ['cred'],
                    default: 'cred'
                })
                break;
        }
        if (input) {
            input.attr('id',getSubflowEnvPropertyName(tenv.name))
        }
    }

    /**
     * Create environment variable input UI
     * @param uiContainer - container for UI
     * @param envList - env var definitions of template
     */
    function buildEnvUI(uiContainer, envList,node) {
        uiContainer.empty();
        var elementID = 0;
        for (var i = 0; i < envList.length; i++) {
            var tenv = envList[i];
            if (tenv.ui && tenv.ui.type === 'hide') {
                continue;
            }
            var row = $("<div/>", { class: "form-row" }).appendTo(uiContainer);
            buildEnvUIRow(row,tenv, tenv.ui || {}, node);

            // console.log(ui);
        }
    }
    // buildEnvUI

    function exportEnvList(list, all) {
        if (list) {
            var env = [];
            list.each(function(i) {
                var entry = $(this);
                var item = entry.data('data');
                var name = (item.parent?item.name:item.nameField.val()).trim();
                if ((name !== "") ||
                    (item.ui && (item.ui.type === "none"))) {
                    var valueInput = item.valueField;
                    var value = valueInput.typedInput("value");
                    var type = valueInput.typedInput("type");
                    if (all || !item.parent || (item.parent.value !== value || item.parent.type !== type)) {
                        var envItem = {
                            name: name,
                            type: type,
                            value: value,
                        };
                        if (item.ui) {
                            var ui = {
                                icon: item.ui.icon,
                                label: $.extend(true,{},item.ui.label),
                                type: item.ui.type,
                                opts: $.extend(true,{},item.ui.opts)
                            }
                            // Check to see if this is the default ui definition.
                            // Delete any defaults to keep it compact
                            // {
                            //     icon: "",
                            //     label: {},
                            //     type: "input",
                            //     opts: {types:DEFAULT_ENV_TYPE_LIST}
                            // }
                            if (!ui.icon) {
                                delete ui.icon;
                            }
                            if ($.isEmptyObject(ui.label)) {
                                delete ui.label;
                            }
                            switch (ui.type) {
                                case "input":
                                    if (JSON.stringify(ui.opts) === JSON.stringify({types:DEFAULT_ENV_TYPE_LIST})) {
                                        // This is the default input config. Delete it as it will
                                        // be applied automatically
                                        delete ui.type;
                                        delete ui.opts;
                                    }
                                    break;
                                case "cred":
                                    if (envItem.type === "cred") {
                                        delete ui.type;
                                    }
                                    delete ui.opts;
                                    break;
                                case "select":
                                    if (ui.opts && $.isEmptyObject(ui.opts.opts)) {
                                        // This is the default select config.
                                        // Delete it as it will be applied automatically
                                        delete ui.opts;
                                    }
                                    break;
                                case "spinner":
                                    if ($.isEmptyObject(ui.opts)) {
                                        // This is the default spinner config.
                                        // Delete as it will be applied automatically
                                        delete ui.opts
                                    }
                                    break;
                                default:
                                    delete ui.opts;
                            }
                            if (!$.isEmptyObject(ui)) {
                                envItem.ui = ui;
                            }
                        }
                        env.push(envItem);
                    }
                }
            });
            return env;
        }
        return null;
    }

    function getSubflowInstanceParentEnv(node) {
        var parentEnv = {};
        var envList = [];
        if (/^subflow:/.test(node.type)) {
            var subflowDef = RED.nodes.subflow(node.type.substring(8));
            if (subflowDef.env) {
                subflowDef.env.forEach(function(env) {
                    var item = {
                        name:env.name,
                        parent: {
                            type: env.type,
                            value: env.value
                        },
                        ui: $.extend(true,{},env.ui)
                    }
                    envList.push(item);
                    parentEnv[env.name] = item;
                })
            }
            if (node.env) {
                for (var i = 0; i < node.env.length; i++) {
                    var env = node.env[i];
                    if (parentEnv.hasOwnProperty(env.name)) {
                        parentEnv[env.name].type = env.type;
                        parentEnv[env.name].value = env.value;
                    } else {
                        // envList.push({
                        //     name: env.name,
                        //     type: env.type,
                        //     value: env.value,
                        // });
                    }
                }
            }
        } else if (node._def.subflowModule) {
            var keys = Object.keys(node._def.defaults);
            keys.forEach(function(name) {
                if (name !== 'name') {
                    var prop = node._def.defaults[name];
                    var nodeProp = node[name];
                    var nodePropType;
                    var nodePropValue = nodeProp;
                    if (prop.ui && prop.ui.type === "cred") {
                        nodePropType = "cred";
                    } else {
                        switch(typeof nodeProp) {
                            case "string": nodePropType = "str"; break;
                            case "number": nodePropType = "num"; break;
                            case "boolean": nodePropType = "bool"; nodePropValue = nodeProp?"true":"false"; break;
                            default:
                            nodePropType = nodeProp.type;
                            nodePropValue = nodeProp.value;
                        }
                    }
                    var item = {
                        name: name,
                        type: nodePropType,
                        value: nodePropValue,
                        parent: {
                            type: prop.type,
                            value: prop.value
                        },
                        ui: $.extend(true,{},prop.ui)
                    }
                    envList.push(item);
                }
            })
        }
        return envList;
    }

    function exportSubflowInstanceEnv(node) {
        var env = [];

        // First, get the values for the SubflowTemplate defined properties
        //  - these are the ones with custom UI elements
        var parentEnv = getSubflowInstanceParentEnv(node);
        parentEnv.forEach(function(data) {
            var item;
            var ui = data.ui || {};
            if (!ui.type) {
                if (data.parent && data.parent.type === "cred") {
                    ui.type = "cred";
                } else {
                    ui.type = "input";
                    ui.opts = {types:DEFAULT_ENV_TYPE_LIST}
                }
            } else {
                ui.opts = ui.opts || {};
            }
            var input = $("#"+getSubflowEnvPropertyName(data.name));
            if (input.length || ui.type === "cred") {
                item = { name: data.name };
                switch(ui.type) {
                    case "input":
                        if (ui.opts.types && ui.opts.types.length > 0) {
                            item.value = input.typedInput('value');
                            item.type = input.typedInput('type');
                        } else {
                            item.value = input.val();
                            item.type = 'str';
                        }
                        break;
                    case "cred":
                        item.value = input.val();
                        item.type = 'cred';
                        break;
                    case "spinner":
                        item.value = input.val();
                        item.type = 'num';
                        break;
                    case "select":
                        item.value = input.val();
                        item.type = 'str';
                        break;
                    case "checkbox":
                        item.type = 'bool';
                        item.value = ""+input.prop("checked");
                        break;
                }
                if (ui.type === "cred" || item.type !== data.parent.type || item.value !== data.parent.value) {
                    env.push(item);
                }
            }
        })
        // Second, get the values from the Properties table tab
        var items = $('#red-ui-editor-subflow-env-list').editableList('items');
        items.each(function (i,el) {
            var data = el.data('data');
            var item;
            if (data.nameField && data.valueField) {
                item = {
                    name: data.nameField.val(),
                    value: data.valueField.typedInput("value"),
                    type: data.valueField.typedInput("type")
                }
                if (item.name.trim() !== "") {
                    env.push(item);
                }
            }
        });
        return env;
    }

    function getSubflowEnvPropertyName(name) {
        return 'node-input-subflow-env-'+name.replace(/[^a-z0-9-_]/ig,"_");
    }

    /**
     * Lookup text for specific locale
     * @param labels - dict of labels
     * @param defaultLabel - fallback label if not found
     * @param locale - target locale
     * @returns {string} text for specified locale
     */
    function lookupLabel(labels, defaultLabel, locale) {
        if (labels) {
            if (labels[locale]) {
                return labels[locale];
            }
            if (locale) {
                var lang = locale.substring(0, 2);
                if (labels[lang]) {
                    return labels[lang];
                }
            }
        }
        return defaultLabel;
    }

    function buildEditForm(type,node) {
        if (type === "subflow-template") {
            buildPropertiesList($('#node-input-env-container'), node);
        } else  if (type === "subflow") {
            // This gets called by the subflow type `oneditprepare` function
            // registered in nodes.js#addSubflow()
            buildEnvUI($("#subflow-input-ui"), getSubflowInstanceParentEnv(node), node);
        }
    }
    function buildPropertiesForm(node) {
        var container = $('#editor-subflow-envProperties-content');
        var form = $('<form class="dialog-form form-horizontal"></form>').appendTo(container);
        var listContainer = $('<div class="form-row node-input-env-container-row"></div>').appendTo(form);
        var list = $('<ol id="red-ui-editor-subflow-env-list" class="red-ui-editor-subflow-env-list"></ol>').appendTo(listContainer);
        buildPropertiesList(list, node);
    }

    function setupInputValidation(input,validator) {
        var errorTip;
        var validateTimeout;

        var validateFunction = function() {
            if (validateTimeout) {
                return;
            }
            validateTimeout = setTimeout(function() {
                var error = validator(input.val());
                // if (!error && errorTip) {
                //     errorTip.close();
                //     errorTip = null;
                // } else if (error && !errorTip) {
                //     errorTip = RED.popover.create({
                //         tooltip: true,
                //         target:input,
                //         size: "small",
                //         direction: "bottom",
                //         content: error,
                //     }).open();
                // }
                input.toggleClass("input-error",!!error);
                validateTimeout = null;
            })
        }
        input.on("change keyup paste", validateFunction);
    }

    function buildModuleForm(container, node) {
        $(_subflowModulePaneTemplate).appendTo(container);
        var moduleProps = node.meta || {};
        [
            'module',
            'type',
            'version',
            'author',
            'desc',
            'keywords',
            'license'
        ].forEach(function(property) {
            $("#subflow-input-module-"+property).val(moduleProps[property]||"")
        })
        $("#subflow-input-module-type").attr("placeholder",node.id);

        setupInputValidation($("#subflow-input-module-module"), function(newValue) {
            newValue = newValue.trim();
            var isValid = newValue.length < 215;
            isValid = isValid && !/^[._]/.test(newValue);
            isValid = isValid && !/[A-Z]/.test(newValue);
            if (newValue !== encodeURIComponent(newValue)) {
                var m = /^@([^\/]+)\/([^\/]+)$/.exec(newValue);
                if (m) {
                    isValid = isValid && (m[1] === encodeURIComponent(m[1]) && m[2] === encodeURIComponent(m[2]))
                } else {
                    isValid = false;
                }
            }
            return isValid?"":"Invalid module name"
        })
        setupInputValidation($("#subflow-input-module-version"), function(newValue) {
            newValue = newValue.trim();
            var isValid = newValue === "" ||
                          /^(\d|[1-9]\d*)\.(\d|[1-9]\d*)\.(\d|[1-9]\d*)(-(0|[1-9A-Za-z-][0-9A-Za-z-]*|[0-9]*[A-Za-z-][0-9A-Za-z-]*)(\.(0|[1-9A-Za-z-][0-9A-Za-z-]*|[0-9]*[A-Za-z-][0-9A-Za-z-]*))*)?(\+[0-9A-Za-z-]+(\.[0-9A-Za-z-]+)*)?$/.test(newValue);
            return isValid?"":"Invalid version number"
        })

        var licenses = ["none", "Apache-2.0", "BSD-3-Clause", "BSD-2-Clause", "GPL-2.0", "GPL-3.0", "MIT", "MPL-2.0", "CDDL-1.0", "EPL-2.0"];
        var typedLicenses = {
            types: licenses.map(function(l) {
                return {
                    value: l,
                    label: l === "none" ? RED._("editor:subflow.licenseNone") : l,
                    hasValue: false
                };
            })
        }
        typedLicenses.types.push({
            value:"_custom_", label:RED._("editor:subflow.licenseOther"), icon:"red/images/typedInput/az.svg"
        })
        if (!moduleProps.license) {
            typedLicenses.default = "none";
        } else if (licenses.indexOf(moduleProps.license) > -1) {
            typedLicenses.default = moduleProps.license;
        } else {
            typedLicenses.default = "_custom_";
        }
        $("#subflow-input-module-license").typedInput(typedLicenses)
    }

    function exportSubflowModuleProperties(node) {
        var value;
        var moduleProps = {};
        [
            'module',
            'type',
            'version',
            'author',
            'desc',
            'keywords'
        ].forEach(function(property) {
            value = $("#subflow-input-module-"+property).val().trim();
            if (value) {
                moduleProps[property] = value;
            }
        })
        var selectedLicenseType = $("#subflow-input-module-license").typedInput("type");

        if (selectedLicenseType === '_custom_') {
            value = $("#subflow-input-module-license").val();
            if (value) {
                moduleProps.license = value;
            }
        } else if (selectedLicenseType !== "none") {
            moduleProps.license = selectedLicenseType;
        }
        return moduleProps;
    }


    return {
        init: init,
        createSubflow: createSubflow,
        convertToSubflow: convertToSubflow,
        removeSubflow: removeSubflow,
        refresh: refresh,
        removeInput: removeSubflowInput,
        removeOutput: removeSubflowOutput,
        removeStatus: removeSubflowStatus,


        buildEditForm: buildEditForm,
        buildPropertiesForm: buildPropertiesForm,
        buildModuleForm: buildModuleForm,

        exportSubflowTemplateEnv: exportEnvList,
        exportSubflowInstanceEnv: exportSubflowInstanceEnv,
        exportSubflowModuleProperties: exportSubflowModuleProperties

    }
})();