/*
 * 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])
 *
 * 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($) {

	$.alerts = {
		/**
		 * Vertical offset (in pixels) of the dialog from center screen.
		 */
		verticalOffset: -75,

		/**
		 * Horizontal offset (in pixels) of the dialog from center screen.
		 */
		horizontalOffset: 0,

		/**
		 * Re-centers the dialog on window resize.
		 */
		repositionOnResize: true,

		/**
		 * Transparency level of overlay.
		 */
		overlayOpacity: .5,

		/**
		 * Base color of overlay.
		 */
		overlayColor: '#fff',

		/**
		 * Text for the OK button.
		 */
		okButton: ' OK ',

		/**
		 * Text for the cancel button.
		 */
		cancelButton: ' Cancel ',

		/**
		 * If specified, this class will be applied to all dialogs.
		 */
		dialogClass: null,

		/**
		 * Shows an alert box.
		 *
		 * @param message
		 * @param title
		 * @param callback
		 */
		alert: function(message, title, callback) {
			if (title == null) title = 'Alert';
			$.alerts._show(title, message, null, 'alert', function(result) {
				if (callback) callback(result);
			});
		},

		/**
		 * Shows a confirmation box.
		 *
		 * @param message
		 * @param title
		 * @param callback
		 */
		confirm: function(message, title, callback) {
			if (title == null) title = 'Confirmation';
			$.alerts._show(title, message, null, 'confirm', function(result) {
				if (callback) callback(result);
			});
		},

		/**
		 * Shows a prompt box.
		 *
		 * @param message
		 * @param value
		 * @param title
		 * @param callback
		 */
		prompt: function(message, value, title, callback) {
			if (title == null) title = 'Prompt';
			$.alerts._show(title, message, value, 'prompt', function(result) {
				if (callback) callback(result);
			});
		},

		/**
		 * Shows a popup box with the specified options.
		 *
		 * @param title
		 * @param msg
		 * @param value
		 * @param type
		 * @param callback
		 */
		_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) {
				$('#popup_container').addClass($.alerts.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="' + $.alerts.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="' + $.alerts.okButton + '" id="popup_ok" /> <input type="button" value="' + $.alerts.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="' + $.alerts.okButton + '" id="popup_ok" /> <input type="button" value="' + $.alerts.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;
			}
		},

		/**
		 * Hides the popup box.
		 */
		_hide: function() {
			$('#popup_container').remove();
			$.alerts._overlay('hide');
			$.alerts._maintainPosition(false);
		},

		/**
		 * Toggles the overlay.
		 *
		 * @param status
		 */
		_overlay: function(status) {
			switch (status) {
			case 'show':
				$.alerts._overlay('hide');
				$('BODY').append('<div id="popup_overlay"></div>');
				$('#popup_overlay').css({
					position: 'absolute',
					zIndex: 99998,
					top: 0,
					left: 0,
					width: '100%',
					height: $(document).height(),
					background: $.alerts.overlayColor,
					opacity: $.alerts.overlayOpacity
				});
				break;
			case 'hide':
				$('#popup_overlay').remove();
				break;
			}
		},

		/**
		 * Repositions the popup box on window resize.
		 */
		_reposition: function() {
			var top = (($(window).height() / 2) - ($('#popup_container').outerHeight() / 2)) + $.alerts.verticalOffset;
			var left = (($(window).width() / 2) - ($('#popup_container').outerWidth() / 2)) + $.alerts.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());
		},

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

	/**
	 * Shortcut function for alert boxes.
	 */
	jAlert = function(message, title, callback) {
		$.alerts.alert(message, title, callback);
	};

	/**
	 * Shortcut function for confirm boxes.
	 */
	jConfirm = function(message, title, callback) {
		$.alerts.confirm(message, title, callback);
	};

	/**
	 * Asks the user if he is sure to delete an item.
	 *
	 * @param url
	 */
	deleteConfirm = function(url) {
		var title = 'Delete Confirmation';

		$.alerts.confirm('Are you sure you want to delete this item?', title, function(answer) {
			if (answer) {
				window.location = url;
			}
		});
	};

	/**
	 * Allows users to change titles.
	 */
	changeTitle = function(value, url) {
		var title = 'Change title';

		$.alerts.prompt('Enter the new title:', value, title, function(text) {
			if (text) {
				$.post(url, { title: text }, function(data) {
					window.location = data;
				});
			}
		});
	};

	/**
	 * Shortcut function for prompt boxes.
	 */
	jPrompt = function(message, value, title, callback) {
		$.alerts.prompt(message, value, title, callback);
	};

})(jQuery);