/*
 * Ext JS Library 1.1 RC 1
 * Copyright(c) 2006-2007, Ext JS, LLC.
 * licensing@extjs.com
 * 
 * http://www.extjs.com/license
 */

/**
 * @class Ext.MessageBox
 * Utility class for generating different styles of message boxes.  The alias Ext.Msg can also be used.
 * Example usage:
 *<pre><code>
// Basic alert:
Ext.Msg.alert('Status', 'Changes saved successfully.');

// Prompt for user data:
Ext.Msg.prompt('Name', 'Please enter your name:', function(btn, text){
    if (btn == 'ok'){
        // process text value...
    }
});

// Show a dialog using config options:
Ext.Msg.show({
   title:'Save Changes?',
   msg: 'Your are closing a tab that has unsaved changes. Would you like to save your changes?',
   buttons: Ext.Msg.YESNOCANCEL,
   fn: processResult,
   animEl: 'elId'
});
</code></pre>
 * @singleton
 */
Ext.MessageBox = function(){
    var dlg, opt, mask, waitTimer;
    var bodyEl, msgEl, textboxEl, textareaEl, progressEl, pp;
    var buttons, activeTextEl, bwidth;

    // private
    var handleButton = function(button){
        dlg.hide();
        Ext.callback(opt.fn, opt.scope||window, [button, activeTextEl.dom.value], 1);
    };

    // private
    var handleHide = function(){
        if(opt && opt.cls){
            dlg.el.removeClass(opt.cls);
        }
        if(waitTimer){
            Ext.TaskMgr.stop(waitTimer);
            waitTimer = null;
        }
    };

    // private
    var updateButtons = function(b){
        var width = 0;
        if(!b){
            buttons["ok"].hide();
            buttons["cancel"].hide();
            buttons["yes"].hide();
            buttons["no"].hide();
            dlg.footer.dom.style.display = 'none';
            return width;
        }
        dlg.footer.dom.style.display = '';
        for(var k in buttons){
            if(typeof buttons[k] != "function"){
                if(b[k]){
                    buttons[k].show();
                    buttons[k].setText(typeof b[k] == "string" ? b[k] : Ext.MessageBox.buttonText[k]);
                    width += buttons[k].el.getWidth()+15;
                }else{
                    buttons[k].hide();
                }
            }
        }
        return width;
    };

    // private
    var handleEsc = function(d, k, e){
        if(opt && opt.closable !== false){
            dlg.hide();
        }
        if(e){
            e.stopEvent();
        }
    };

    return {
        /**
         * Returns a reference to the underlying {@link Ext.BasicDialog} element
         * @return {Ext.BasicDialog} The BasicDialog element
         */
        getDialog : function(){
           if(!dlg){
                dlg = new Ext.BasicDialog("x-msg-box", {
                    autoCreate : true,
                    shadow: true,
                    draggable: true,
                    resizable:false,
                    constraintoviewport:false,
                    fixedcenter:true,
                    collapsible : false,
                    shim:true,
                    modal: true,
                    width:400, height:100,
                    buttonAlign:"center",
                    closeClick : function(){
                        if(opt && opt.buttons && opt.buttons.no && !opt.buttons.cancel){
                            handleButton("no");
                        }else{
                            handleButton("cancel");
                        }
                    }
                });
                dlg.on("hide", handleHide);
                mask = dlg.mask;
                dlg.addKeyListener(27, handleEsc);
                buttons = {};
                var bt = this.buttonText;
                buttons["ok"] = dlg.addButton(bt["ok"], handleButton.createCallback("ok"));
                buttons["yes"] = dlg.addButton(bt["yes"], handleButton.createCallback("yes"));
                buttons["no"] = dlg.addButton(bt["no"], handleButton.createCallback("no"));
                buttons["cancel"] = dlg.addButton(bt["cancel"], handleButton.createCallback("cancel"));
                bodyEl = dlg.body.createChild({

                    html:'<span class="ext-mb-text"></span><br /><input type="text" class="ext-mb-input" /><textarea class="ext-mb-textarea"></textarea><div class="ext-mb-progress-wrap"><div class="ext-mb-progress"><div class="ext-mb-progress-bar">&#160;</div></div></div>'
                });
                msgEl = bodyEl.dom.firstChild;
                textboxEl = Ext.get(bodyEl.dom.childNodes[2]);
                textboxEl.enableDisplayMode();
                textboxEl.addKeyListener([10,13], function(){
                    if(dlg.isVisible() && opt && opt.buttons){
                        if(opt.buttons.ok){
                            handleButton("ok");
                        }else if(opt.buttons.yes){
                            handleButton("yes");
                        }
                    }
                });
                textareaEl = Ext.get(bodyEl.dom.childNodes[3]);
                textareaEl.enableDisplayMode();
                progressEl = Ext.get(bodyEl.dom.childNodes[4]);
                progressEl.enableDisplayMode();
                var pf = progressEl.dom.firstChild;
                pp = Ext.get(pf.firstChild);
                pp.setHeight(pf.offsetHeight);
            }
            return dlg;
        },

        /**
         * Updates the message box body text
         * @param {String} text (optional) Replaces the message box element's innerHTML with the specified string (defaults to
         * the XHTML-compliant non-breaking space character '&amp;#160;')
         * @return {Ext.MessageBox} This message box
         */
        updateText : function(text){
            if(!dlg.isVisible() && !opt.width){
                dlg.resizeTo(this.maxWidth, 100); // resize first so content is never clipped from previous shows
            }
            msgEl.innerHTML = text || '&#160;';
            var w = Math.max(Math.min(opt.width || msgEl.offsetWidth, this.maxWidth), 
                        Math.max(opt.minWidth || this.minWidth, bwidth));
            if(opt.prompt){
                activeTextEl.setWidth(w);
            }
            if(dlg.isVisible()){
                dlg.fixedcenter = false;
            }
            dlg.setContentSize(w, bodyEl.getHeight());
            if(dlg.isVisible()){
                dlg.fixedcenter = true;
            }
            return this;
        },

        /**
         * Updates a progress-style message box's text and progress bar.  Only relevant on message boxes
         * initiated via {@link Ext.MessageBox#progress} or by calling {@link Ext.MessageBox#show} with progress: true.
         * @param {Number} value Any number between 0 and 1 (e.g., .5)
         * @param {String} text (optional) If defined, the message box's body text is replaced with the specified string (defaults to undefined)
         * @return {Ext.MessageBox} This message box
         */
        updateProgress : function(value, text){
            if(text){
                this.updateText(text);
            }
            pp.setWidth(Math.floor(value*progressEl.dom.firstChild.offsetWidth));
            return this;
        },        

        /**
         * Returns true if the message box is currently displayed
         * @return {Boolean} True if the message box is visible, else false
         */
        isVisible : function(){
            return dlg && dlg.isVisible();  
        },

        /**
         * Hides the message box if it is displayed
         */
        hide : function(){
            if(this.isVisible()){
                dlg.hide();
            }  
        },

        /**
         * Displays a new message box, or reinitializes an existing message box, based on the config options
         * passed in. All functions (e.g. prompt, alert, etc) on MessageBox call this function internally.
         * The following config object properties are supported:
         * <pre>
Property    Type             Description
----------  ---------------  ----------------------------------------------------------------------
title       String           The title text
closable    Boolean          False to hide the top-right close box (defaults to true)
prompt      Boolean          True to prompt the user to enter single-line text (defaults to false)
multiline   Boolean          True to prompt the user to enter multi-line text (defaults to false)
progress    Boolean          True to display a progress bar (defaults to false)
value       String           The string value to set into the active textbox element if displayed
buttons     Object/Boolean   A button config object (e.g., Ext.MessageBox.OKCANCEL or {ok:'Foo',
                             cancel:'Bar'}), or false to not show any buttons (defaults to false)
msg         String           A string that will replace the existing message box body text (defaults
                             to the XHTML-compliant non-breaking space character &#160;)
cls         String           A custom CSS class to apply to the message box element
proxyDrag   Boolean          True to display a lightweight proxy while dragging (defaults to false)
modal       Boolean          False to allow user interaction with the page while the message box is
                             displayed (defaults to true)
</pre>
         *
         * Example usage:
         * <pre><code>
Ext.Msg.show({
   title: 'Address',
   msg: 'Please enter your address:',
   width: 300,
   buttons: Ext.MessageBox.OKCANCEL,
   multiline: true,