/**
 * 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.view.tools = (function() {


    function alignToGrid() {
        var selection = RED.view.selection();
        if (selection.nodes) {
            var changedNodes = [];
            selection.nodes.forEach(function(n) {
                var x = n.w/2 + Math.round((n.x-n.w/2)/RED.view.gridSize())*RED.view.gridSize();
                var y = Math.round(n.y/RED.view.gridSize())*RED.view.gridSize();
                if (n.x !== x || n.y !== y) {
                    changedNodes.push({
                        n:n,
                        ox: n.x,
                        oy: n.y,
                        moved: n.moved
                    });
                    n.x = x;
                    n.y = y;
                    n.dirty = true;
                    n.moved = true;
                }
            });
            if (changedNodes.length > 0) {
                RED.history.push({t:"move",nodes:changedNodes,dirty:RED.nodes.dirty()});
                RED.nodes.dirty(true);
                RED.view.redraw(true);
            }
        }
    }

    var moving_set = null;
    var endMoveSet = false;
    function endKeyboardMove() {
        endMoveSet = false;
        if (moving_set.length > 0) {
            var ns = [];
            for (var i=0;i<moving_set.length;i++) {
                ns.push({n:moving_set[i].n,ox:moving_set[i].ox,oy:moving_set[i].oy,moved:moving_set[i].moved});
                moving_set[i].n.moved = true;
                moving_set[i].n.dirty = true;
                delete moving_set[i].ox;
                delete moving_set[i].oy;
            }
            RED.view.redraw();
            RED.history.push({t:"move",nodes:ns,dirty:RED.nodes.dirty()});
            RED.nodes.dirty(true);
            moving_set = null;
        }
    }

    function moveSelection(dx,dy) {
        if (moving_set === null) {
            moving_set = [];
            var selection = RED.view.selection();
            if (selection.nodes) {
                while (selection.nodes.length > 0) {
                    var n = selection.nodes.shift();
                    moving_set.push({n:n});
                    if (n.type === "group") {
                        selection.nodes = selection.nodes.concat(n.nodes);
                    }
                }
            }
        }
        if (moving_set && moving_set.length > 0) {
            if (!endMoveSet) {
                $(document).one('keyup',endKeyboardMove);
                endMoveSet = true;
            }
            var minX = 0;
            var minY = 0;
            var node;

            for (var i=0;i<moving_set.length;i++) {
                node = moving_set[i];
                if (node.ox == null && node.oy == null) {
                    node.ox = node.n.x;
                    node.oy = node.n.y;
                    node.moved = node.n.moved;
                }
                node.n.moved = true;
                node.n.dirty = true;
                node.n.x += dx;
                node.n.y += dy;
                node.n.dirty = true;
                if (node.n.type === "group") {
                    RED.group.markDirty(node.n);
                }
                minX = Math.min(node.n.x-node.n.w/2-5,minX);
                minY = Math.min(node.n.y-node.n.h/2-5,minY);
            }

            if (minX !== 0 || minY !== 0) {
                for (var n = 0; n<moving_set.length; n++) {
                    node = moving_set[n];
                    node.n.x -= minX;
                    node.n.y -= minY;
                }
            }
            RED.view.redraw();
        } else {
            RED.view.scroll(dx*10,dy*10);
        }
    }

    return {
        init: function() {
            RED.actions.add("core:align-selection-to-grid", alignToGrid);

            RED.actions.add("core:scroll-view-up", function() { RED.view.scroll(0,-RED.view.gridSize());});
            RED.actions.add("core:scroll-view-right", function() { RED.view.scroll(RED.view.gridSize(),0);});
            RED.actions.add("core:scroll-view-down", function() { RED.view.scroll(0,RED.view.gridSize());});
            RED.actions.add("core:scroll-view-left", function() { RED.view.scroll(-RED.view.gridSize(),0);});

            RED.actions.add("core:step-view-up", function() { RED.view.scroll(0,-5*RED.view.gridSize());});
            RED.actions.add("core:step-view-right", function() { RED.view.scroll(5*RED.view.gridSize(),0);});
            RED.actions.add("core:step-view-down", function() { RED.view.scroll(0,5*RED.view.gridSize());});
            RED.actions.add("core:step-view-left", function() { RED.view.scroll(-5*RED.view.gridSize(),0);});

            RED.actions.add("core:move-selection-up", function() { moveSelection(0,-1);});
            RED.actions.add("core:move-selection-right", function() { moveSelection(1,0);});
            RED.actions.add("core:move-selection-down", function() { moveSelection(0,1);});
            RED.actions.add("core:move-selection-left", function() { moveSelection(-1,0);});

            RED.actions.add("core:step-selection-up", function() { moveSelection(0,-RED.view.gridSize());});
            RED.actions.add("core:step-selection-right", function() { moveSelection(RED.view.gridSize(),0);});
            RED.actions.add("core:step-selection-down", function() { moveSelection(0,RED.view.gridSize());});
            RED.actions.add("core:step-selection-left", function() { moveSelection(-RED.view.gridSize(),0);});
        },
        /**
         * Aligns all selected nodes to the current grid
         */
        alignSelectionToGrid: alignToGrid,
        /**
         * Moves all of the selected nodes by the specified amount
         * @param  {Number} dx
         * @param  {Number} dy
         */
        moveSelection: moveSelection
    }

})();