// jQuery Alert Dialogs Plugin
//
// Version 1.1
//
// Cory S.N. LaViska
// A Beautiful Site (http://abeautifulsite.net/)
// 14 May 2009
//
// Visit http://abeautifulsite.net/notebook/87 for more information
//
// Usage:
//		jAlert( message, [title, callback] )
//		jConfirm( message, [title, callback] )
//		jPrompt( message, [value, title, callback] )
// 
// History:
//
//		1.00 - Released (29 December 2008)
//
//		1.01 - Fixed bug where unbinding would destroy all resize events
//
// License:
// 
// This plugin is dual-licensed under the GNU General Public License and the MIT License and
// is copyright 2008 A Beautiful Site, LLC. 
//
(function($) {
    var alertSettings;
    var sett;
    var userAgent = navigator.userAgent.toLowerCase();
    //var browserVersion = (userAgent.match( /.+(?:rv|it|ra|ie)[\/: ]([\d.]+)/ ) || [0,'0'])[1];
    var browserVersion = (userAgent.match(/.+(?:rv|webkit|khtml|opera|msie)[\/: ]([\d.]+)/) || [0, '0'])[1];
    var isIE6 = (/msie/.test(userAgent) && !/opera/.test(userAgent) && parseInt(browserVersion) < 7 && !window.XMLHttpRequest);
    $.alerts = {

        // Public methods
        basicsettings: { //basic propertity
            verticalOffset: -50,                // vertical offset of the dialog from center screen, in pixels
            horizontalOffset: 0,                // horizontal offset of the dialog from center screen, in pixels/
            repositionOnResize: true,           // re-centers the dialog on window resize
            overlayOpacity: .01,                // transparency level of overlay
            overlayColor: '#FFF',               // base color of overlay
            draggable: true,                    // make the dialogs draggable (requires UI Draggables plugin)
            okButton: '&nbsp;确定&nbsp;',         // text for the OK button
            cancelButton: '&nbsp;取消&nbsp;', // text for the Cancel button
            dialogClass: null                 // if specified, this class will be applied to all dialogs
        },

        alert: function(message, title, callback) {
            if (title == null) title = '提示窗口';
            $.alerts._show(title, message, null, 'alert', function(result) {
                if (callback) callback(result);
            });
        },

        confirm: function(message, title, callback) {
        if (title == null) title = '提示窗口';
            $.alerts._show(title, message, null, 'confirm', function(result) {
                if (callback) callback(result);
            });
        },

        prompt: function(message, value, title, callback) {
        if (title == null) title = '提示窗口';
            $.alerts._show(title, message, value, 'prompt', function(result) {
                if (callback) callback(result);
            });
        },

        // Private methods

        _show: function(title, msg, value, type, callback) {

            $.alerts._hide();
            $.alerts._overlay('show');

            $("BODY").append(
			  '<div id="popup_container">' +
			    '<h1 id="popup_title"></h1>' +
			    '<div id="popup_content">' +
			      '<div id="popup_message"></div>' +
				'</div>' +
			  '</div>');

            if ($.alerts.dialogClass) $("#popup_container").addClass(alertSettings.dialogClass);

            // IE6 Fix
            var pos = ($.browser.msie && parseInt($.browser.version) <= 6) ? 'absolute' : 'fixed';

            $("#popup_container").css({
                position: pos,
                zIndex: 99999,
                padding: 0,
                margin: 0
            });

            $("#popup_title").text(title);
            $("#popup_content").addClass(type);
            $("#popup_message").text(msg);
            $("#popup_message").html($("#popup_message").text().replace(/\n/g, '<br />'));

            $("#popup_container").css({
                minWidth: $("#popup_container").outerWidth(),
                maxWidth: $("#popup_container").outerWidth()
            });

            $.alerts._reposition();
            $.alerts._maintainPosition(true);

            switch (type) {
                case 'alert':
                    $("#popup_message").after('<div id="popup_panel"><input type="button" value="' + alertSettings.okButton + '" id="popup_ok" /></div>');
                    $("#popup_ok").click(function() {
                        $.alerts._hide();
                        callback(true);
                    });
                    $("#popup_ok").focus().keypress(function(e) {
                        if (e.keyCode == 13 || e.keyCode == 27) $("#popup_ok").trigger('click');
                    });
                    break;
                case 'confirm':
                    $("#popup_message").after('<div id="popup_panel"><input type="button" value="' + alertSettings.okButton + '" id="popup_ok" /> <input type="button" value="' + alertSettings.cancelButton + '" id="popup_cancel" /></div>');
                    $("#popup_ok").click(function() {
                        $.alerts._hide();
                        if (callback) callback(true);
                    });
                    $("#popup_cancel").click(function() {
                        $.alerts._hide();
                        if (callback) callback(false);
                    });
                    $("#popup_ok").focus();
                    $("#popup_ok, #popup_cancel").keypress(function(e) {
                        if (e.keyCode == 13) $("#popup_ok").trigger('click');
                        if (e.keyCode == 27) $("#popup_cancel").trigger('click');
                    });
                    break;
                case 'prompt':
                    $("#popup_message").append('<br /><input type="text" size="30" id="popup_prompt" />').after('<div id="popup_panel"><input type="button" value="' + alertSettings.okButton + '" id="popup_ok" /> <input type="button" value="' + alertSettings.cancelButton + '" id="popup_cancel" /></div>');
                    $("#popup_prompt").width($("#popup_message").width());
                    $("#popup_ok").click(function() {
                        var val = $("#popup_prompt").val();
                        $.alerts._hide();
                        if (callback) callback(val);
                    });
                    $("#popup_cancel").click(function() {
                        $.alerts._hide();
                        if (callback) callback(null);
                    });
                    $("#popup_prompt, #popup_ok, #popup_cancel").keypress(function(e) {
                        if (e.keyCode == 13) $("#popup_ok").trigger('click');
                        if (e.keyCode == 27) $("#popup_cancel").trigger('click');
                    });
                    if (value) $("#popup_prompt").val(value);
                    $("#popup_prompt").focus().select();
                    break;
            }

            // Make draggable
            if (alertSettings.draggable) {
                try {
                    $("#popup_container").draggable({ handle: $("#popup_title") });
                    $("#popup_title").css({ cursor: 'move' });
                } catch (e) { /* requires jQuery UI draggables */ }
            }
        },

        _hide: function() {
            $("#popup_container").remove();
            $.alerts._overlay('hide');
            $.alerts._maintainPosition(false);
        },

        _overlay: function(status) {
            switch (status) {
                case 'show':
                    $.alerts._overlay('hide');
                    if (isIE6) {
                        $("BODY").append('<div id="popup_overlay"><iframe style="position: absolute;width: 100%;height: 100%;z-index:-1;"></iframe></div>');
                    }
                    else {
                        $("BODY").append('<div id="popup_overlay"></div>');
                    }
                    $("#popup_overlay").css({
                        position: 'absolute',
                        zIndex: 99998,
                        top: '0px',
                        left: '0px',
                        width: '100%',
                        height: $(document).height(),
                        background: alertSettings.overlayColor,
                        opacity: alertSettings.overlayOpacity
                    });
                    break;
                case 'hide':
                    $("#popup_overlay").remove();
                    break;
            }
        },

        _reposition: function() {
            var top = (($(window).height()*1 / 2) - ($("#popup_container").outerHeight() / 2)) + alertSettings.verticalOffset;
            var left = (($(window).width() / 2) - ($("#popup_container").outerWidth() / 2)) + alertSettings.horizontalOffset;
            if (top < 0) top = 0;
            if (left < 0) left = 0;

            // IE6 fix
            if ($.browser.msie && parseInt($.browser.version) <= 6) top = top + $(window).scrollTop();

            $("#popup_container").css({
                top: top + 'px',
                left: left + 'px'
            });
            $("#popup_overlay").height($(document).height());
        },

        _maintainPosition: function(status) {
            if (alertSettings.repositionOnResize) {
                switch (status) {
                    case true:
                        $(window).bind('resize', $.alerts._reposition);
                        break;
                    case false:
                        $(window).unbind('resize', $.alerts._reposition);
                        break;
                }
            }
        }

    }

    // Shortuct functions
    jAlert = function(message, title, callback, sett) {
        alertSettings = $.extend(true, {}, $.alerts.basicsettings, sett);
        $.alerts.alert(message, title, callback);
    }

    jConfirm = function(message, title, callback, sett) {
        alertSettings = $.extend(true, {}, $.alerts.basicsettings, sett);
        $.alerts.confirm(message, title, callback);
    };

    jPrompt = function(message, value, title, callback, sett) {
        alertSettings = $.extend(true, {}, $.alerts.basicsettings, sett);
        $.alerts.prompt(message, value, title, callback);
    };

})(jQuery);