/*
 *
 * (c) Copyright Ascensio System Limited 2010-2016
 *
 * This program is a free software product. You can redistribute it and/or
 * modify it under the terms of the GNU Affero General Public License (AGPL)
 * version 3 as published by the Free Software Foundation. In accordance with
 * Section 7(a) of the GNU AGPL its Section 15 shall be amended to the effect
 * that Ascensio System SIA expressly excludes the warranty of non-infringement
 * of any third-party rights.
 *
 * This program is distributed WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR  PURPOSE. For
 * details, see the GNU AGPL at: http://www.gnu.org/licenses/agpl-3.0.html
 *
 * You can contact Ascensio System SIA at Lubanas st. 125a-25, Riga, Latvia,
 * EU, LV-1021.
 *
 * The  interactive user interfaces in modified source and object code versions
 * of the Program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU AGPL version 3.
 *
 * Pursuant to Section 7(b) of the License you must retain the original Product
 * logo when distributing the program. Pursuant to Section 7(e) we decline to
 * grant you any rights under trademark law for use of our trademarks.
 *
 * All the Product's GUI elements, including illustrations and icon sets, as
 * well as technical writing content are licensed under the terms of the
 * Creative Commons Attribution-ShareAlike 4.0 International. See the License
 * terms at http://creativecommons.org/licenses/by-sa/4.0/legalcode
 *
*/
/**
 *    Layout.js
 *
 *    Created by Maxim Kadushkin on 10 February 2014
 *    Copyright (c) 2014 Ascensio System SIA. All rights reserved.
 *
 *
 *      Configuration
 *      -------------
 *
 *      @selector layout-ct
 *      css class selector for the layout container
 *
 *      @selector layout-item
 *      css class selector for the layout item
 *
 *
 *      @cfg {Object} box
 *      Contains the layout container object
 *
 *      @cfg {Boolean} stretch
 *      If true, layout item will be stretched to all parent's space free from the static items
 *
 *      @cfg {Boolean} rely
 *      If true, @width and @height will correspond to DOMElement.width() and DOMElement.height()
 *      If @stretch is true, @rely will be ignored.
 *
 *      @cfg {Boolean} resizable
 *      reserved
 *
 *      @cfg {Integer} width
 *      @cfg {Integer} height
 *      Describe static size for the layout item.
 *      For VBoxLayout:
 *          @width = 100%,
 *          @height = DOMElement.height() if rely = true
 *
 *      For HBoxLayout:
 *          @height = 100%,
 *          @width = DOMElement.width() if rely = true
 *
 *      If @stretch is true, @width and @height will be ignored.
 *
 *
 *      Methods
 *      -------
 *
 *      @method doLayout
 *      Makes rearrangement of the layout items
 *
 *
 *      Example of usage
 *      ----------------
 *
 *      var $container = $('#hbox-layout');
 *      items = $container.find(' > .layout-item');
 *      var hLayout = new Common.UI.HBoxLayout({
 *          box: $container,
 *          items: [
 *              {el: items[0]},
 *              {el: items[1], stretch: true},
 *              {el: items[2], rely: true}
 *          ]
 *      });
 *
 */

if (Common === undefined)
    var Common = {};

define([
    'backbone'
], function () {
    'use strict';

    var BaseLayout = function(options) {
        this.box        = null;
        this.panels     = [];
        this.splitters  = [];

        _.extend(this, options || {});
    };

    var LayoutPanel = function() {
        return {
            width       : null,
            height      : null,
            resize      : false,
            stretch     : false,
            rely        : false
        }
    };

    _.extend(BaseLayout.prototype, Backbone.Events, {
        initialize: function(options) {
            this.$parent = this.box.parent();

            this.resize = {
                eventMove: _.bind(this.resizeMove, this),
                eventStop: _.bind(this.resizeStop, this)
            };

            var panel, resizer, stretch = false;
            options.items.forEach(function(item) {
                item.el instanceof HTMLElement && (item.el = $(item.el));
                panel = _.extend(new LayoutPanel(), item);
                if ( panel.stretch ) {
                    stretch         = true;
                    panel.rely      = false;
                    panel.resize    = false;
                }

                this.panels.push(panel);

                if (panel.resize) {
                    resizer = {
                        isresizer   : true,
                        minpos      : panel.resize.min||0,
                        maxpos      : panel.resize.max||0,
                        fmin        : panel.resize.fmin,
                        fmax        : panel.resize.fmax,
                        behaviour   : panel.behaviour,
                        index       : this.splitters.length
                    };

                    if (!stretch) {
                        panel.resize.el =
                        resizer.el = panel.el.after('<div class="layout-resizer after"></div>').next();
                        this.panels.push(resizer);
                    } else {
                        panel.resize.el =
                        resizer.el = panel.el.before('<div class="layout-resizer before"></div>').prev();
                        this.panels.splice(this.panels.length - 1, 0, resizer);
                    }

                    this.splitters.push({resizer:resizer});

                    panel.resize.hidden && resizer.el.hide();
                }
            }, this);

            this.freeze = options.freeze; this.freeze && this.freezePanels(this.freeze);
        },

        doLayout: function() {
        },

        getElementHeight: function(el) {
            return parseInt(el.css('height'));
        },

        getElementWidth: function(el) {
            return parseInt(el.css('width'));
        },

        onSelectStart: function(e) {
            if (e.preventDefault) e.preventDefault();
            return false;
        },

        addHandler: function(elem, type, handler) {
            if (elem.addEventListener) {
                elem.addEventListener(type, handler);
            } else
            if (elem.attachEvent) {
                elem.attachEvent('on' + type, handler);
            } else {
                elem['on' + type] = handler;
            }
        },

        removeHandler: function(elem, type, handler) {
            if (elem.removeEventListener) {
                elem.removeEventListener(type, handler);
            } else
            if (elem.detachEvent) {
                elem.detachEvent('on' + type, handler);
            } else {
                elem['on' + type] = null;
            }
        },

        clearSelection: function() {
            if (window.getSelection) {
                var selection = window.getSelection();
                if (selection.empty) selection.empty(); else
                if (selection.removeAllRanges) selection.removeAllRanges();
            } else if (document.selection) {
                document.selection.empty();
            }
        },

        resizeStart: function(e) {
            this.clearSelection();
            this.addHandler(window.document, 'selectstart', this.onSelectStart);

            $(document).on({
                mousemove   : this.resize.eventMove,
                mouseup     : this.resize.eventStop
            });

            Common.NotificationCenter.on({
                'frame:mousemove': this.resize.eventMove,
                'frame:mouseup': this.resize.eventStop
            });

            var panel             = e.data.panel;
            this.resize.type      = e.data.type;
            this.resize.$el       = panel.el;
            this.resize.min       = panel.minpos;
            this.resize.fmin      = panel.fmin;
            this.resize.fmax      = panel.fmax;
            this.resize.behaviour = panel.behaviour;

            this.resize.$el.addClass('move');

            if (e.data.type == 'vertical') {
                this.resize.height  = parseInt(this.resize.$el.css('height'));
                this.resize.max     = (panel.maxpos > 0 ? panel.maxpos : this.resize.$el.parent().height() + panel.maxpos) - this.resize.height;
                this.resize.inity   = e.pageY - parseInt(e.currentTarget.style.top);
            } else
            if (e.data.type == 'horizontal') {
                this.resize.width   = parseInt(this.resize.$el.css('width'));
                this.resize.max     = (panel.maxpos > 0 ? panel.maxpos : this.resize.$el.parent().height() + panel.maxpos) - this.resize.width;
                this.resize.initx   = e.pageX - parseInt(e.currentTarget.style.left);
            }
            Common.NotificationCenter.trigger('layout:resizestart');
        },

        resizeMove: function(e) {
            if (this.resize.type == 'vertical') {
                var prop    = 'top',
                    value   = e.pageY - this.resize.inity;
            } else
            if (this.resize.type == 'horizontal') {
                prop        = 'left';
                value       = e.pageX - this.resize.initx;
            }

            if (this.resize.fmin && this.resize.fmax) {
                if (!(value < this.resize.fmin()) && !(value > this.resize.fmax())) {
                    this.resize.$el[0].style[prop] = value + 'px';
                }
            } else {

                if (!(value < this.resize.min) && !(value > this.resize.max)) {
                    this.resize.$el[0].style[prop] = value + 'px';
                }
            }
        },

        resizeStop: function(e) {
            this.removeHandler(window.document, 'selectstart', this.onSelectStart);

            $(document).off({
                mousemove   : this.resize.eventMove,
                mouseup     : this.resize.eventStop
            });

            Common.NotificationCenter.off({
                'frame:mousemove': this.resize.eventMove,
                'frame:mouseup': this.resize.eventStop
            });

            if (!this.resize.$el) return;

            if (this.resize.type == 'vertical') {
                var prop = 'height';
                var value = e.pageY - this.resize.inity;
            } else
            if (this.resize.type == 'horizontal') {
                prop = 'width';
                value = e.pageX - this.resize.initx;
            }

            if (this.resize.fmin && this.resize.fmax) {
                value < this.resize.fmin() && (value = this.resize.fmin());
                value > this.resize.fmax() && (value = this.resize.fmax());
            } else {
                value < this.resize.min && (value = this.resize.min);
                value > this.resize.max && (value = this.resize.max);
            }

            var panel = null, next = null, oldValue = 0;

            if (this.resize.$el.hasClass('after')) {
                panel = this.resize.$el.prev();
                next = this.resize.$el.next();
                oldValue = parseInt(panel.css(prop));
            } else {
                panel = this.resize.$el.next();
                next = this.resize.$el.next();
                oldValue = parseInt(panel.css(prop));
                value = panel.parent()[prop]() - (value + this.resize[prop]);
            }

            if (this.resize.type == 'vertical')
                value -= panel.position().top;
            if (this.resize.type == 'horizontal')
                value -= panel.position().left;

            panel.css(prop, value + 'px');

            if (this.resize.behaviour) {
                next.css(prop, parseInt(next.css(prop)) - (value - oldValue));
            }

            this.resize.$el.removeClass('move');
            delete this.resize.$el;

            if (this.resize.value != value) {
                this.doLayout();
                this.trigger('layout:resizedrag', this);
            }
            Common.NotificationCenter.trigger('layout:resizestop');
        },

        freezePanels: function (value) {

            this.panels.forEach( function (panel) {

                if (!panel.stretch && panel.resize) {
                    $(panel.resize.el).css('cursor', value ? 'default' : '');
                }
            });

            this.freeze = value;
        },

        setResizeValue: function (index, value) {
            if (index >= this.splitters.length)
                return;

            var panel = null, next = null, oldValue = 0,
                resize = this.splitters[index].resizer,
                prop = 'height';

            value < resize.fmin() && (value = resize.fmin());
            value > resize.fmax() && (value = resize.fmax());


            if (resize.el.hasClass('after')) {
                panel = resize.el.prev();
                next = resize.el.next();
                oldValue = parseInt(panel.css(prop));
            } else {
                panel = resize.el.next();
                value = panel.parent()[prop]() - (value + resize[prop]);
                next = resize.el.next();
                oldValue = parseInt(panel.css(prop));
            }

           // if (resize.type == 'vertical')
                value -= panel.position().top;
           // if (resize.type == 'horizontal')
           //     value -= panel.position().left;

            panel.css(prop, value + 'px');

            if (resize.behaviour) {
                next.css(prop, parseInt(next.css(prop)) - (value - oldValue));
            }

            if (resize.value != value) {
                this.doLayout();
            }
        }
    });

    !Common.UI && (Common.UI = {});

    Common.UI.VBoxLayout = function(options) {
        BaseLayout.apply(this, arguments);
        this.initialize.apply(this, arguments);
    };

    Common.UI.VBoxLayout.prototype = _.extend(new BaseLayout(), {
        initialize: function(options){
            BaseLayout.prototype.initialize.call(this,options);

            this.panels.forEach(function(panel){
                !panel.stretch && !panel.height && (panel.height = this.getElementHeight(panel.el));

                if (panel.isresizer) {
                    panel.el.on('mousedown', {type: 'vertical', panel: panel}, _.bind(this.resizeStart, this));
                }
            }, this);

            this.doLayout.call(this);
        },

        doLayout: function() {
            var height = 0, stretchable, style;
            this.panels.forEach(function(panel){
                if ( !panel.stretch ) {
                    style = panel.el.is(':visible');
                    if ( style ) {
                        height += (panel.rely!==true ? panel.height : this.getElementHeight(panel.el));
                    }

                    if (panel.resize && panel.resize.autohide !== false && panel.resize.el) {
                        if (style) {
                            panel.resize.el.show();
                            stretchable && (height += panel.resize.height);
                        } else {
                            panel.resize.el.hide();
                            stretchable && (height -= panel.resize.height);
                        }
                    }
                } else {
                    stretchable = panel;
                }
            }, this);

            stretchable && (stretchable.height = this.$parent.height() - height);

            height = 0;
            this.panels.forEach(function(panel){
                if (panel.el.is(':visible')) {
                    style = {top: height};
                    panel.rely!==true && (style.height = panel.height);
                    panel.el.css(style);
                    height += this.getElementHeight(panel.el);
                }
            }, this);
        }
    });

    Common.UI.HBoxLayout = function(options) {
        BaseLayout.apply(this, arguments);
        this.initialize.apply(this, arguments);
    };

    Common.UI.HBoxLayout.prototype = _.extend(new BaseLayout(), {
        initialize: function(options){
            BaseLayout.prototype.initialize.call(this,options);

            this.panels.forEach(function(panel){
                !panel.stretch && !panel.width && (panel.width = this.getElementWidth(panel.el));

                if (panel.isresizer) {
                    panel.el.on('mousedown', {type: 'horizontal', panel: panel}, _.bind(this.resizeStart, this));
                }
            }, this);

            this.doLayout.call(this);
        },

        doLayout: function(event) {
            var width = 0, stretchable, style;
            this.panels.forEach(function(panel){
                if ( !panel.stretch ) {
                    style = panel.el.is(':visible');
                    if ( style ) {
                        width += (panel.rely!==true ? panel.width : this.getElementWidth(panel.el));
                    }

                    if (panel.resize && panel.resize.autohide !== false && panel.resize.el) {
                        if (style) {
                            panel.resize.el.show();
                            stretchable && (width -= panel.resize.width);
                        } else {
                            panel.resize.el.hide();
                            stretchable && (width -= panel.resize.width);
                        }
                    }
                } else {
                    stretchable = panel;
                }
            }, this);

            stretchable && (stretchable.width = this.$parent.width() - width);

            width = 0;
            this.panels.forEach(function(panel){
                if (panel.el.is(':visible')) {
                    style = {left: width};
                    panel.rely!==true && (style.width = panel.width);
                    panel.el.css(style);
                    width += this.getElementWidth(panel.el);
                }
            },this);
        }
    });

    Common.UI.VBoxLayout.prototype.constructor = Common.UI.VBoxLayout;
    Common.UI.HBoxLayout.prototype.constructor = Common.UI.HBoxLayout;
});