/*

This file is part of Ext JS 4

Copyright (c) 2011 Sencha Inc

Contact:  http://www.sencha.com/contact

GNU General Public License Usage
This file may be used under the terms of the GNU General Public License version 3.0 as published by the Free Software Foundation and appearing in the file LICENSE included in the packaging of this file.  Please review the following information to ensure the GNU General Public License version 3.0 requirements will be met: http://www.gnu.org/copyleft/gpl.html.

If you are unsure which license is appropriate for your use, please contact the sales department at http://www.sencha.com/contact.

*/
/*!
 * Ext JS Library 4.0
 * Copyright(c) 2006-2011 Sencha Inc.
 * licensing@sencha.com
 * http://www.sencha.com/license
 */

/**
 * @class Ext.ux.desktop.Desktop
 * @extends Ext.panel.Panel
 * <p>This class manages the wallpaper, shortcuts and taskbar.</p>
 */
Ext.define('Ext.ux.desktop.Desktop', {
    extend: 'Ext.panel.Panel',

    alias: 'widget.desktop',

    uses: [
        'Ext.util.MixedCollection',
        'Ext.menu.Menu',
        'Ext.view.View', // dataview
        'Ext.window.Window',

        'Ext.ux.desktop.TaskBar',
        'Ext.ux.desktop.Wallpaper',
        'Ext.ux.desktop.FitAllLayout'
    ],

    activeWindowCls: 'ux-desktop-active-win',
    inactiveWindowCls: 'ux-desktop-inactive-win',
    lastActiveWindow: null,

    border: false,
    html: '&#160;',
    layout: 'fitall',

    xTickSize: 1,
    yTickSize: 1,

    app: null,

    /**
     * @cfg {Array|Store} shortcuts
     * The items to add to the DataView. This can be a {@link Ext.data.Store Store} or a
     * simple array. Items should minimally provide the fields in the
     * {@link Ext.ux.desktop.ShorcutModel ShortcutModel}.
     */
    shortcuts: null,

    /**
     * @cfg {String} shortcutItemSelector
     * This property is passed to the DataView for the desktop to select shortcut items.
     * If the {@link #shortcutTpl} is modified, this will probably need to be modified as
     * well.
     */
    shortcutItemSelector: 'div.ux-desktop-shortcut',

    /**
     * @cfg {String} shortcutTpl
     * This XTemplate is used to render items in the DataView. If this is changed, the
     * {@link shortcutItemSelect} will probably also need to changed.
     */
    shortcutTpl: [
        '<tpl for=".">',
            '<div class="ux-desktop-shortcut" id="{name}-shortcut">',
                '<div class="ux-desktop-shortcut-icon {iconCls}">',
                    '<img src="',Ext.BLANK_IMAGE_URL,'" title="{name}">',
                '</div>',
                '<span class="ux-desktop-shortcut-text">{name}</span>',
            '</div>',
        '</tpl>',
        '<div class="x-clear"></div>'
    ],

    /**
     * @cfg {Object} taskbarConfig
     * The config object for the TaskBar.
     */
    taskbarConfig: null,

    windowMenu: null,

    initComponent: function () {
        var me = this;

        me.windowMenu = new Ext.menu.Menu(me.createWindowMenu());

        me.bbar = me.taskbar = new Ext.ux.desktop.TaskBar(me.taskbarConfig);
        me.taskbar.windowMenu = me.windowMenu;

        me.windows = new Ext.util.MixedCollection();

        me.contextMenu = new Ext.menu.Menu(me.createDesktopMenu());

        me.items = [
            { xtype: 'wallpaper', id: me.id+'_wallpaper' },
            me.createDataView()
        ];

        me.callParent();

        me.shortcutsView = me.items.getAt(1);
        me.shortcutsView.on('itemclick', me.onShortcutItemClick, me);

        var wallpaper = me.wallpaper;
        me.wallpaper = me.items.getAt(0);
        if (wallpaper) {
            me.setWallpaper(wallpaper, me.wallpaperStretch);
        }
    },

    afterRender: function () {
        var me = this;
        me.callParent();
        me.el.on('contextmenu', me.onDesktopMenu, me);
    },

    //------------------------------------------------------
    // Overrideable configuration creation methods

    createDataView: function () {
        var me = this;
        return {
            xtype: 'dataview',
            overItemCls: 'x-view-over',
            trackOver: true,
            itemSelector: me.shortcutItemSelector,
            store: me.shortcuts,
            tpl: new Ext.XTemplate(me.shortcutTpl)
        };
    },

    createDesktopMenu: function () {
        var me = this, ret = {
            items: me.contextMenuItems || []
        };

        if (ret.items.length) {
            ret.items.push('-');
        }

        ret.items.push(
                { text: 'Tile', handler: me.tileWindows, scope: me, minWindows: 1 },
                { text: 'Cascade', handler: me.cascadeWindows, scope: me, minWindows: 1 })

        return ret;
    },

    createWindowMenu: function () {
        var me = this;
        return {
            defaultAlign: 'br-tr',
            items: [
                { text: 'Restore', handler: me.onWindowMenuRestore, scope: me },
                { text: 'Minimize', handler: me.onWindowMenuMinimize, scope: me },
                { text: 'Maximize', handler: me.onWindowMenuMaximize, scope: me },
                '-',
                { text: 'Close', handler: me.onWindowMenuClose, scope: me }
            ],
            listeners: {
                beforeshow: me.onWindowMenuBeforeShow,
                hide: me.onWindowMenuHide,
                scope: me
            }
        };
    },

    //------------------------------------------------------
    // Event handler methods

    onDesktopMenu: function (e) {
        var me = this, menu = me.contextMenu;
        e.stopEvent();
        if (!menu.rendered) {
            menu.on('beforeshow', me.onDesktopMenuBeforeShow, me);
        }
        menu.showAt(e.getXY());
        menu.doConstrain();
    },

    onDesktopMenuBeforeShow: function (menu) {
        var me = this, count = me.windows.getCount();

        menu.items.each(function (item) {
            var min = item.minWindows || 0;
            item.setDisabled(count < min);
        });
    },

    onShortcutItemClick: function (dataView, record) {
        var me = this, module = me.app.getModule(record.data.module),
            win = module && module.createWindow();

        if (win) {
            me.restoreWindow(win);
        }
    },

    onWindowClose: function(win) {
        var me = this;
        me.windows.remove(win);
        me.taskbar.removeTaskButton(win.taskButton);
        me.updateActiveWindow();
    },

    //------------------------------------------------------
    // Window context menu handlers

    onWindowMenuBeforeShow: function (menu) {
        var items = menu.items.items, win = menu.theWin;
        items[0].setDisabled(win.maximized !== true && win.hidden !== true); // Restore
        items[1].setDisabled(win.minimized === true); // Minimize
        items[2].setDisabled(win.maximized === true || win.hidden === true); // Maximize
    },

    onWindowMenuClose: function () {
        var me = this, win = me.windowMenu.theWin;

        win.close();
    },

    onWindowMenuHide: function (menu) {
        menu.theWin = null;
    },

    onWindowMenuMaximize: function () {
        var me = this, win = me.windowMenu.theWin;

        win.maximize();
    },

    onWindowMenuMinimize: function () {
        var me = this, win = me.windowMenu.theWin;

        win.minimize();
    },

    onWindowMenuRestore: function () {
        var me = this, win = me.windowMenu.theWin;

        me.restoreWindow(win);
    },

    //------------------------------------------------------
    // Dynamic (re)configuration methods

    getWallpaper: function () {
        return this.wallpaper.wallpaper;
    },

    setTickSize: function(xTickSize, yTickSize) {
        var me = this,
            xt = me.xTickSize = xTickSize,
            yt = me.yTickSize = (arguments.length > 1) ? yTickSize : xt;

        me.windows.each(function(win) {
            var dd = win.dd, resizer = win.resizer;
            dd.xTickSize = xt;
            dd.yTickSize = yt;
            resizer.widthIncrement = xt;
            resizer.heightIncrement = yt;
        });
    },

    setWallpaper: function (wallpaper, stretch) {
        this.wallpaper.setWallpaper(wallpaper, stretch);
        return this;
    },

    //------------------------------------------------------
    // Window management methods

    cascadeWindows: function() {
        var x = 0, y = 0,
            zmgr = this.getDesktopZIndexManager();

        zmgr.eachBottomUp(function(win) {
            if (win.isWindow && win.isVisible() && !win.maximized) {
                win.setPosition(x, y);
                x += 20;
                y += 20;
            }
        });
    },

    createWindow: function(config, cls) {
        var me = this, win, cfg = Ext.applyIf(config || {}, {
                stateful: false,
                isWindow: true,
                constrainHeader: true,
                minimizable: true,
                maximizable: true
            });

        cls = cls || Ext.window.Window;
        win = me.add(new cls(cfg));

        me.windows.add(win);

        win.taskButton = me.taskbar.addTaskButton(win);
        win.animateTarget = win.taskButton.el;

        win.on({
            activate: me.updateActiveWindow,
            beforeshow: me.updateActiveWindow,
            deactivate: me.updateActiveWindow,
            minimize: me.minimizeWindow,
            destroy: me.onWindowClose,
            scope: me
        });

        win.on({
            afterrender: function () {
                win.dd.xTickSize = me.xTickSize;
                win.dd.yTickSize = me.yTickSize;

                if (win.resizer) {
                    win.resizer.widthIncrement = me.xTickSize;
                    win.resizer.heightIncrement = me.yTickSize;
                }
            },
            single: true
        });

        // replace normal window close w/fadeOut animation:
        win.doClose = function ()  {
            win.doClose = Ext.emptyFn; // dblclick can call again...
            win.el.disableShadow();
            win.el.fadeOut({
                listeners: {
                    afteranimate: function () {
                        win.destroy();
                    }
                }
            });
        };

        return win;
    },

    getActiveWindow: function () {
        var win = null,
            zmgr = this.getDesktopZIndexManager();

        if (zmgr) {
            // We cannot rely on activate/deactive because that fires against non-Window
            // components in the stack.

            zmgr.eachTopDown(function (comp) {
                if (comp.isWindow && !comp.hidden) {
                    win = comp;
                    return false;
                }
                return true;
            });
        }

        return win;
    },

    getDesktopZIndexManager: function () {
        var windows = this.windows;
        // TODO - there has to be a better way to get this...
        return (windows.getCount() && windows.getAt(0).zIndexManager) || null;
    },

    getWindow: function(id) {
        return this.windows.get(id);
    },

    minimizeWindow: function(win) {
        win.minimized = true;
        win.hide();
    },

    restoreWindow: function (win) {
        if (win.isVisible()) {
            win.restore();
            win.toFront();
        } else {
            win.show();
        }
        return win;
    },

    tileWindows: function() {
        var me = this, availWidth = me.body.getWidth(true);
        var x = me.xTickSize, y = me.yTickSize, nextY = y;

        me.windows.each(function(win) {
            if (win.isVisible() && !win.maximized) {
                var w = win.el.getWidth();

                // Wrap to next row if we are not at the line start and this Window will
                // go off the end
                if (x > me.xTickSize && x + w > availWidth) {
                    x = me.xTickSize;
                    y = nextY;
                }

                win.setPosition(x, y);
                x += w + me.xTickSize;
                nextY = Math.max(nextY, y + win.el.getHeight() + me.yTickSize);
            }
        });
    },

    updateActiveWindow: function () {
        var me = this, activeWindow = me.getActiveWindow(), last = me.lastActiveWindow;
        if (activeWindow === last) {
            return;
        }

        if (last) {
            if (last.el.dom) {
                last.addCls(me.inactiveWindowCls);
                last.removeCls(me.activeWindowCls);
            }
            last.active = false;
        }

        me.lastActiveWindow = activeWindow;

        if (activeWindow) {
            activeWindow.addCls(me.activeWindowCls);
            activeWindow.removeCls(me.inactiveWindowCls);
            activeWindow.minimized = false;
            activeWindow.active = true;
        }

        me.taskbar.setActiveButton(activeWindow && activeWindow.taskButton);
    }
});

