/**
 * 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.commandPrompt = (function() {

    var disabled = false;
    var dialog = null;
    var searchInput;
    var searchResults;
    var selected = -1;
    var visible = false;

    var results = [];

    var scopes = {};

    function search(val) {
        scopes = {};
        results = [];
        selected = -1;
        val = val ||"";
        searchResults.editableList('empty');

        var actions = RED.actions.list();
        actions.sort(function(A,B) {
            return A.id.localeCompare(B.id);
        });

        val = val.trim().toLowerCase();

        actions.forEach(function(action) {
            action.label = action.id.replace(/:/,": ").replace(/-/g," ").replace(/(^| )./g,function() { return arguments[0].toUpperCase()});
            if (val !== "" && action.label.toLowerCase().indexOf(val) === -1) {
                return;
            }
            results.push(action);
            searchResults.editableList('addItem',action)
        })

    }

    function ensureSelectedIsVisible() {
        var selectedEntry = searchResults.find("li.selected");
        if (selectedEntry.length === 1) {
            var scrollWindow = searchResults.parent();
            var scrollHeight = scrollWindow.height();
            var scrollOffset = scrollWindow.scrollTop();
            var y = selectedEntry.position().top;
            var h = selectedEntry.height();
            if (y+h > scrollHeight) {
                scrollWindow.animate({scrollTop: '-='+(scrollHeight-(y+h)-10)},50);
            } else if (y<0) {
                scrollWindow.animate({scrollTop: '+='+(y-10)},50);
            }
        }
    }

    function createDialog() {
        dialog = $("<div>",{id:"red-ui-commandPrompt",class:"red-ui-search"}).appendTo("#red-ui-main-container");
        var searchDiv = $("<div>",{class:"red-ui-search-container"}).appendTo(dialog);
        searchInput = $('<input type="text" data-i18n="[placeholder]search.actions">').appendTo(searchDiv).searchBox({
            delay: 200,
            change: function() {
                search($(this).val());
            }
        });

        searchInput.on('keydown',function(evt) {
            var children;
            if (results.length > 0) {
                if (evt.keyCode === 40) {
                    // Down
                    children = searchResults.children();
                    if (selected < children.length-1) {
                        if (selected > -1) {
                            $(children[selected]).removeClass('selected');
                        }
                        selected++;
                    }
                    $(children[selected]).addClass('selected');
                    ensureSelectedIsVisible();
                    evt.preventDefault();
                } else if (evt.keyCode === 38) {
                    // Up
                    children = searchResults.children();
                    if (selected > 0) {
                        if (selected < children.length) {
                            $(children[selected]).removeClass('selected');
                        }
                        selected--;
                    }
                    $(children[selected]).addClass('selected');
                    ensureSelectedIsVisible();
                    evt.preventDefault();
                } else if (evt.keyCode === 13) {
                    // Enter
                    if (results.length > 0) {
                        selectCommand(results[Math.max(0,selected)]);
                    }
                }
            }
        });
        searchInput.i18n();

        var searchResultsDiv = $("<div>",{class:"red-ui-search-results-container"}).appendTo(dialog);
        searchResults = $('<ol>',{style:"position: absolute;top: 5px;bottom: 5px;left: 5px;right: 5px;"}).appendTo(searchResultsDiv).editableList({
            addButton: false,
            addItem: function(container,i,action) {
                if (action.id === undefined) {
                    $('<div>',{class:"red-ui-search-empty"}).text(RED._('search.empty')).appendTo(container);
                } else {
                    var div = $('<a>',{href:'#',class:"red-ui-search-result"}).appendTo(container);
                    var contentDiv = $('<div>',{class:"red-ui-search-result-action"}).appendTo(div);


                    $('<div>').text(action.label).appendTo(contentDiv);
                    // $('<div>',{class:"red-ui-search-result-node-type"}).text(node.type).appendTo(contentDiv);
                    // $('<div>',{class:"red-ui-search-result-node-id"}).text(node.id).appendTo(contentDiv);
                    if (action.key) {
                        $('<div>',{class:"red-ui-search-result-action-key"}).html(RED.keyboard.formatKey(action.key)).appendTo(contentDiv);
                    }
                    div.on("click", function(evt) {
                        evt.preventDefault();
                        selectCommand(action);
                    });
                }
            },
            scrollOnAdd: false
        });

    }

    function selectCommand(command) {
        hide();
        RED.actions.invoke(command.id);
    }

    function show(v) {
        if (disabled) {
            return;
        }
        if (!visible) {
            RED.keyboard.add("*","escape",function(){hide()});
            $("#red-ui-header-shade").show();
            $("#red-ui-editor-shade").show();
            $("#red-ui-palette-shade").show();
            $("#red-ui-sidebar-shade").show();
            $("#red-ui-sidebar-separator").hide();
            if (dialog === null) {
                createDialog();
            }
            dialog.slideDown(300);
            searchInput.searchBox('value',v)
            search(v);
            RED.events.emit("commandPrompt:open");
            visible = true;
        }
        searchInput.trigger("focus");
    }

    function hide() {
        if (visible) {
            RED.keyboard.remove("escape");
            visible = false;
            $("#red-ui-header-shade").hide();
            $("#red-ui-editor-shade").hide();
            $("#red-ui-palette-shade").hide();
            $("#red-ui-sidebar-shade").hide();
            $("#red-ui-sidebar-separator").show();
            if (dialog !== null) {
                dialog.slideUp(200,function() {
                    searchInput.searchBox('value','');
                });
            }
            RED.events.emit("commandPrompt:close");
        }
    }

    function init() {
        RED.actions.add("core:show-command-prompt",show);

        RED.events.on("editor:open",function() { disabled = true; });
        RED.events.on("editor:close",function() { disabled = false; });
        RED.events.on("search:open",function() { disabled = true; });
        RED.events.on("search:close",function() { disabled = false; });
        RED.events.on("type-search:open",function() { disabled = true; });
        RED.events.on("type-search:close",function() { disabled = false; });

        $("#red-ui-header-shade").on('mousedown',hide);
        $("#red-ui-editor-shade").on('mousedown',hide);
        $("#red-ui-palette-shade").on('mousedown',hide);
        $("#red-ui-sidebar-shade").on('mousedown',hide);
    }

    return {
        init: init,
        show: show,
        hide: hide
    };

})();