/*
 *    Copyright [2012] [wisemapping]
 *
 *   Licensed under WiseMapping Public License, Version 1.0 (the "License").
 *   It is basically the Apache License, Version 2.0 (the "License") plus the
 *   "powered by wisemapping" text requirement on every single page;
 *   you may not use this file except in compliance with the License.
 *   You may obtain a copy of the license at
 *
 *       http://www.wisemapping.org/license
 *
 *   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.
 */

mindplot.DesignerKeyboard = new Class({
    Extends: mindplot.Keyboard,
    Static:{
        register:function (designer) {
            this._instance = new mindplot.DesignerKeyboard(designer);
        },

        getInstance:function () {
            return this._instance;
        }
    },

    initialize:function (designer) {
        $assert(designer, "designer can not be null");
        this._registerEvents(designer);
    },

    _registerEvents:function (designer) {

        // Try with the keyboard ..
        var model = designer.getModel();
        this.addShortcut(
            ['backspace'], function (event) {
                event.preventDefault();
                event.stopPropagation();
                designer.deleteSelectedEntities();
            }
        );
        this.addShortcut(
            ['space'], function() {
                designer.shrinkSelectedBranch();
            }
        );
        this.addShortcut(
            ['f2'],function() {
                var node = model.selectedTopic();
                if (node) {
                    node.showTextEditor();
                }
            }
        );
        this.addShortcut(
            ['del'], function(event) {
                designer.deleteSelectedEntities();
                event.preventDefault();
                event.stopPropagation();
            }
        );
        this.addShortcut(
            ['enter'], function() {
                designer.createSiblingForSelectedNode();
            }
        );
        this.addShortcut(
            ['insert'], function(event) {
                designer.createChildForSelectedNode();
                event.preventDefault();
                event.stopPropagation();
            }
        );
        this.addShortcut(
            ['tab'], function(event) {
                designer.createChildForSelectedNode();
                event.preventDefault();
                event.stopPropagation();
            }
        );
        this.addShortcut(
            '-', function() { // "-" is a insert on several Browsers. Don't ask why ...
                designer.createChildForSelectedNode();
            }
        );
        this.addShortcut(
            ['meta+enter'], function(event) {
                event.preventDefault();
                event.stopPropagation();
                designer.createChildForSelectedNode();
            }
        );
        this.addShortcut(
            ['ctrl+z', 'meta+z'], function(event) {
                event.preventDefault(event);
                event.stopPropagation();
                designer.undo();
            }
        );
        this.addShortcut(
            ['ctrl+c', 'meta+c'], function (event) {
                event.preventDefault(event);
                event.stopPropagation();
                designer.copyToClipboard();
            }
        );
        this.addShortcut(
            ['ctrl+v', 'meta+v'], function (event) {
                event.preventDefault(event);
                event.stopPropagation();
                designer.pasteClipboard();
            }
        );
        this.addShortcut(
            ['ctrl+shift+z', 'meta+shift+z', 'ctrl+y', 'meta+y'], function (event) {
                event.preventDefault();
                event.stopPropagation();
                designer.redo();
            }
        );
        this.addShortcut(
            ['ctrl+a', 'meta+a'], function (event) {
                event.preventDefault();
                event.stopPropagation();
                designer.selectAll();
            }
        );
        this.addShortcut(
            ['ctrl+b', 'meta+b'], function (event) {
                event.preventDefault();
                event.stopPropagation();

                designer.changeFontWeight();
            }
        );
        this.addShortcut(
            ['ctrl+s', 'meta+s'], function (event) {
                event.preventDefault();
                event.stopPropagation();
                $(document).find('#save').trigger('click');
            }
        );
        this.addShortcut(
            ['ctrl+i', 'meta+i'], function (event) {
                event.preventDefault();
                event.stopPropagation();

                designer.changeFontStyle();
            }
        );
        this.addShortcut(
            ['ctrl+shift+a', 'meta+shift+a'], function (event) {
                event.preventDefault();
                event.stopPropagation();

                designer.deselectAll();
            }
        );
        this.addShortcut(
            ['meta+=', 'ctrl+='], function (event) {
                event.preventDefault();
                event.stopPropagation();

                designer.zoomIn();
            }
        );
        this.addShortcut(
            ['meta+-', 'ctrl+-'], function (event) {
                event.preventDefault();
                event.stopPropagation();

                designer.zoomOut();
            }
        );
        var me = this;
        this.addShortcut(
            'right', function (event) {
                var node = model.selectedTopic();
                if (node) {
                    if (node.isCentralTopic()) {
                        me._goToSideChild(designer, node, 'RIGHT');
                    }
                    else {
                        if (node.getPosition().x < 0) {
                            me._goToParent(designer, node);
                        }
                        else if (!node.areChildrenShrunken()) {
                            me._goToChild(designer, node);
                        }
                    }
                } else {
                    var centralTopic = model.getCentralTopic();
                    me._goToNode(designer, centralTopic);
                }
                event.preventDefault();
                event.stopPropagation();
            }
        );
        this.addShortcut(
            'left', function (event) {
                var node = model.selectedTopic();
                if (node) {
                    if (node.isCentralTopic()) {
                        me._goToSideChild(designer, node, 'LEFT');
                    }
                    else {
                        if (node.getPosition().x > 0) {
                            me._goToParent(designer, node);
                        }
                        else if (!node.areChildrenShrunken()) {
                            me._goToChild(designer, node);
                        }
                    }
                } else {
                    var centralTopic = model.getCentralTopic();
                    me._goToNode(designer, centralTopic);
                }
                event.preventDefault();
                event.stopPropagation();
            }
        );
        this.addShortcut(
            'up', function (event) {
                var node = model.selectedTopic();
                if (node) {
                    if (!node.isCentralTopic()) {
                        me._goToBrother(designer, node, 'UP');
                    }
                } else {
                    var centralTopic = model.getCentralTopic();
                    me._goToNode(designer, centralTopic);
                }
                event.preventDefault();
                event.stopPropagation();
            }
        );
        this.addShortcut(
            'down', function (event) {
                var node = model.selectedTopic();
                if (node) {
                    if (!node.isCentralTopic()) {
                        me._goToBrother(designer, node, 'DOWN');
                    }
                } else {
                    var centralTopic = model.getCentralTopic();
                    me._goToNode(designer, centralTopic);
                }
                event.preventDefault();
                event.stopPropagation();
            }
        );

        $(document).on('keydown', function (event) {

            var keyCode = event.keyCode;

            if (!jQuery.hotkeys.specialKeys[keyCode] && !jQuery.hotkeys.shiftNums[keyCode] && keyCode != 91 /*win key*/) {
                var nodes = designer.getModel().filterSelectedTopics();
                if (nodes.length > 0) {

                    // If a modifier is press, the key selected must be ignored.
                    var pressKey = String.fromCharCode(keyCode);
                    if (event.ctrlKey || event.altKey || event.metaKey || event.shiftKey) {
                        return;
                    }
                    nodes[0].showTextEditor(pressKey);
                    event.stopPropagation();
                }
            }
        });

    },

    _goToBrother:function (designer, node, direction) {
        var parent = node.getParent();
        if (parent) {
            var brothers = parent.getChildren();

            var target = node;
            var y = node.getPosition().y;
            var x = node.getPosition().x;
            var dist = null;
            for (var i = 0; i < brothers.length; i++) {
                var sameSide = (x * brothers[i].getPosition().x) >= 0;
                if (brothers[i] != node && sameSide) {
                    var brother = brothers[i];
                    var brotherY = brother.getPosition().y;
                    if (direction == "DOWN" && brotherY > y) {
                        var distancia = y - brotherY;
                        if (distancia < 0) {
                            distancia = distancia * (-1);
                        }
                        if (dist == null || dist > distancia) {
                            dist = distancia;
                            target = brothers[i];
                        }
                    }
                    else if (direction == "UP" && brotherY < y) {
                        var distance = y - brotherY;
                        if (distance < 0) {
                            distance = distance * (-1);
                        }
                        if (dist == null || dist > distance) {
                            dist = distance;
                            target = brothers[i];
                        }
                    }
                }
            }
            this._goToNode(designer, target);
        }
    },


    _goToSideChild:function (designer, node, side) {
        var children = node.getChildren();
        if (children.length > 0) {
            var target = children[0];
            var top = null;
            for (var i = 0; i < children.length; i++) {
                var child = children[i];
                var childY = child.getPosition().y;
                if (side == 'LEFT' && child.getPosition().x < 0) {
                    if (top == null || childY < top) {
                        target = child;
                        top = childY;
                    }
                }
                if (side == 'RIGHT' && child.getPosition().x > 0) {
                    if (top == null || childY < top) {
                        target = child;
                        top = childY;
                    }
                }
            }

            this._goToNode(designer, target);
        }
    },

    _goToParent:function (designer, node) {
        var parent = node.getParent();
        if (parent) {
            this._goToNode(designer, parent);
        }
    },

    _goToChild:function (designer, node) {
        var children = node.getChildren();
        if (children.length > 0) {
            var target = children[0];
            var top = target.getPosition().y;
            for (var i = 0; i < children.length; i++) {
                var child = children[i];
                if (child.getPosition().y < top) {
                    top = child.getPosition().y;
                    target = child;
                }
            }
            this._goToNode(designer, target);
        }
    },

    _goToNode:function (designer, node) {
        // First deselect all the nodes ...
        designer.deselectAll();

        // Give focus to the selected node....
        node.setOnFocus(true);
    }

});