/**
 * Javascript handlers for generic model admin.
 * 
 * Most of the work being done here is intercepting clicks on form submits,
 * and managing the loading and sequencing of data between the different panels of
 * the CMS interface.
 * 
 * @todo add live query to manage application of events to DOM refreshes
 * @todo alias the $ function instead of literal jQuery
 */
(function($) {
$(document).ready(function() {
	/**
	 * Generic ajax error handler
	 */
	$('form').livequery('ajaxError', function (XMLHttpRequest, textStatus, errorThrown) {
			$('input', this).removeClass('loading');
			statusMessage(ss.i18n._t('ModelAdmin.ERROR', 'Error'), 'bad');
	});
	
	/** 
	 * Add class ajaxActions class to the parent of Add button of AddForm
	 * so it float to the right
	 */
	$('#Form_AddForm_action_doCreate').livequery(function(){
		$(this).parent().addClass('ajaxActions');
	});
	
	/*
	 * Highlight buttons on click
	 */
	$('input[type=submit]').livequery('click', function() {
		$(this).addClass('loading');
	});
	
	$("#right").scroll( function () {
		positionActionArea();
	});
	
	$(window).resize( function() {
		positionActionArea();
	});
	
	/*
	 * Make the status message and ajax action button fixed 
	 */
	function positionActionArea() {
		if ( $.browser.msie && $.browser.version.indexOf("6.", 0)==0 ) {
			newTopValue = $("#right").scrollTop()+$(window).height()-139;
			$('.ajaxActions').css('top', newTopValue);
			$('#statusMessage').css('top', newTopValue);
		}
	}
	
	////////////////////////////////////////////////////////////////// 
	// Search form 
	////////////////////////////////////////////////////////////////// 
	
	/**
	 * If a dropdown is used to choose between the classes, it is handled by this code
	 */
	$('#ModelClassSelector select')
		// Set up an onchange function to show the applicable form and hide all others
		.change(function() {
			var $selector = $(this);
			$('option', this).each(function() {
				var $form = $('#'+$(this).val());
				if($selector.val() == $(this).val()) $form.show();
				else $form.hide();
			});
		})
		// Initialise the form by calling this onchange event straight away
		.change();

	/**
	 * Stores a jQuery reference to the last submitted search form.
	 */
	__lastSearch = null;

	/**
	 * Submits a search filter query and attaches event handlers
	 * to the response table, excluding the import form because 
	 * file ($_FILES) submission doesn't work using AJAX 
	 * 
	 * Note: This is used for Form_CreateForm too
	 * 
	 * @todo use livequery to manage ResultTable click handlers
	 */
	$('#SearchForm_holder .tab form:not(#Form_ImportForm)').submit(function () {
		var $form = $(this);
	
		// @todo TinyMCE coupling
		jQuery('#Form_EditForm').concrete('ss').cleanup();

		$('#ModelAdminPanel').fn('startHistory', $(this).attr('action'), $(this).formToArray());
		$('#ModelAdminPanel').load(
			$(this).attr('action'), 
			$(this).formToArray(), 
			standardStatusHandler(function(result) {
				if(!this.future || !this.future.length) {
					$('#Form_EditForm_action_goForward, #Form_ResultsForm_action_goForward').hide();
				}
				if(!this.history || this.history.length <= 1) {
					$('#Form_EditForm_action_goBack, #Form_ResultsForm_action_goBack').hide();
				}

				$('#form_actions_right').remove();
				Behaviour.apply();

				if(window.onresize) window.onresize();
				// Remove the loading indicators from the buttons
				$('input[type=submit]', $form).removeClass('loading');
			}, 
			// Failure handler - we should still remove loading indicator
			function () {
				$('input[type=submit]', $form).removeClass('loading');
			})
		);
			
		return false;
	});

	/**
	 * Clear search button
	 */
	$('#SearchForm_holder button[name=action_clearsearch]').click(function(e) {
		$(this.form).resetForm();
		return false;
	});

	/**
	 * Column selection in search form
	  */
	$('a.form_frontend_function.toggle_result_assembly').click(function(){
		var toggleElement = $(this).next();
		toggleElement.toggle();
		return false;
	});
	
	$('a.form_frontend_function.tick_all_result_assembly').click(function(){
		var resultAssembly = $(this).prevAll('div#ResultAssembly').find('ul li input');
		resultAssembly.attr('checked', 'checked');
		return false;
	});
	
	$('a.form_frontend_function.untick_all_result_assembly').click(function(){
		var resultAssembly = $(this).prevAll('div#ResultAssembly').find('ul li input');
		resultAssembly.removeAttr('checked');
		return false;
	});

	////////////////////////////////////////////////////////////////// 
	// Results list 
	////////////////////////////////////////////////////////////////// 
	
	/**
	 * Table record handler for search result record
	 * @todo: Shouldn't this be part of TableListField?
	 */
	$('#right #Form_ResultsForm tbody td a:not(.deletelink,.downloadlink)')
		.livequery('click', function(){
			$(this).parent().parent().addClass('loading');
			var el = $(this);
			$('#ModelAdminPanel').fn('addHistory', el.attr('href'));
			$('#ModelAdminPanel').fn('loadForm', el.attr('href'));
			return false;
		});

	////////////////////////////////////////////////////////////////// 
	// RHS detail form
	////////////////////////////////////////////////////////////////// 

	/**
	 * RHS panel Back button
	 */
	$('#Form_EditForm_action_goBack, #Form_ResultsForm_action_goBack').livequery('click', function() {
		$('#ModelAdminPanel').fn('goBack');
		return false;
	});

	/**
	 * RHS panel Back button
	 */
	$('#Form_ResultsForm_action_goForward').livequery('click', function() {
		$('#ModelAdminPanel').fn('goForward');
		return false;
	});
	
	/**
	 * RHS panel Save button 
	 */
	$('#right input[name=action_doSave],#right input[name=action_doCreate]').livequery('click', function(){
		var form = $('#right form');
		var formAction = form.attr('action') + '?' + $(this).fieldSerialize();
		
		// @todo TinyMCE coupling
		if(typeof tinyMCE != 'undefined') tinyMCE.triggerSave();
		
		// Post the data to save
		$.post(formAction, form.formToArray(), function(result){
			// @todo TinyMCE coupling
			jQuery('#Form_EditForm').concrete('ss').cleanup();
			
			$('#right #ModelAdminPanel').html(result);

			if($('#right #ModelAdminPanel form').hasClass('validationerror')) {
				statusMessage(ss.i18n._t('ModelAdmin.VALIDATIONERROR', 'Validation Error'), 'bad');
			} else {
				statusMessage(ss.i18n._t('ModelAdmin.SAVED', 'Saved'), 'good');
			}

			// TODO/SAM: It seems a bit of a hack to have to list all the little updaters here. 
			// Is livequery a solution?
			Behaviour.apply(); // refreshes ComplexTableField
			if(window.onresize) window.onresize();
		}, 'html');

		return false;
	});
	
	/**
	 * RHS panel Delete button
	 */
	$('#right input[name=action_doDelete]').livequery('click', function(){
		var confirmed = confirm(ss.i18n._t('ModelAdmin.REALLYDELETE', 'Really delete?'));
		if(!confirmed) {
			$(this).removeClass('loading')
			return false;
		}

		var form = $('#right form');
		var formAction = form.attr('action') + '?' + $(this).fieldSerialize();

		// The POST actually handles the delete
		$.post(formAction, form.formToArray(), function(result){
			// On success, the panel is refreshed and a status message shown.
			$('#right #ModelAdminPanel').html(result);
			
			statusMessage(ss.i18n._t('ModelAdmin.DELETED', 'Successfully deleted'));
			$('#form_actions_right').remove();
			
			// To do - convert everything to jQuery so that this isn't needed
			Behaviour.apply(); // refreshes ComplexTableField
		});
		
		return false;
	});

		
	////////////////////////////////////////////////////////////////// 
	// Import/Add form 
	////////////////////////////////////////////////////////////////// 

	/**
	 * Add object button
	 */
	$('#Form_ManagedModelsSelect').submit(function(){
		className = $('select option:selected', this).val();
		requestPath = $(this).attr('action').replace('ManagedModelsSelect', className + '/add');
		var $button = $(':submit', this);
		$('#ModelAdminPanel').fn(
			'loadForm', 
			requestPath,
			function() {
				$button.removeClass('loading');
				$button = null;
			}
		);
		$('#form_actions_right').remove();
		return false;
	});
	
	/**
	 * Toggle import specifications
	 */
	$('.importSpec .details').hide();
	$('.importSpec a.detailsLink').click(function() {
		$('#' + $(this).attr('href').replace(/.*#/,'')).toggle();
		return false;
	});

	////////////////////////////////////////////////////////////////// 
	// Helper functions
	////////////////////////////////////////////////////////////////// 
	
	$('#ModelAdminPanel').fn({
		/**
		 * Load a detail editing form into the main edit panel
		 * @todo Convert everything to jQuery so that the built-in load method can be used with this instead
		 */
		loadForm: function(url, successCallback) {
			// @todo TinyMCE coupling
			jQuery('#Form_EditForm').concrete('ss').cleanup();
	
			$('#right #ModelAdminPanel').load(url, standardStatusHandler(function(result) {
				if(typeof(successCallback) == 'function') successCallback.apply();
				if(!this.future || !this.future.length) {
					$('#Form_EditForm_action_goForward, #Form_ResultsForm_action_goForward').hide();
				}
				if(!this.history || this.history.length <= 1) {
					$('#Form_EditForm_action_goBack, #Form_ResultsForm_action_goBack').hide();
				}
				
				Behaviour.apply(); // refreshes ComplexTableField
				if(window.onresize) window.onresize();
			}));
		},
		
		startHistory: function(url, data) {
			this.history = [];
			$(this).fn('addHistory', url, data);
		},
		
		/**
		 * Add an item to the history, to be accessed by goBack and goForward
		 */
		addHistory: function(url, data) {
			// Combine data into URL
			if(data) {
				if(url.indexOf('?') == -1) url += '?' + $.param(data);
				else url += '&' + $.param(data);
			}
			
			// Add to history 
			if(this.history == null) this.history = [];
			this.history.push(url);
			
			// Reset future
			this.future = [];
		},
		
		goBack: function() {
			if(this.history && this.history.length) {
				if(this.future == null) this.future = [];
				
				var currentPage = this.history.pop();
				var previousPage = this.history[this.history.length-1];
				
				this.future.push(currentPage);
				$(this).fn('loadForm', previousPage);
			}
		},
		
		goForward: function() {
			if(this.future && this.future.length) {
				if(this.future == null) this.future = [];
				
				var nextPage = this.future.pop();
				
				this.history.push(nextPage);
				$(this).fn('loadForm', nextPage);
			}
		}

	});
	
	/**
	 * Standard SilverStripe status handler for ajax responses
	 * It will generate a status message out of the response, and only call the callback for successful responses
	 *
	 * To use:
	 *	Instead of passing your callback function as:
	 *	   function(response) { ... }
	 * 
	 *	Pass it as this:
	 *	   standardStatusHandler(function(response) { ... })
	 */
	function standardStatusHandler(callback, failureCallback) {
		return function(response, status, xhr) {
			// If the response is takne from $.ajax's complete handler, then swap the variables around
			if(response.status) {
				xhr = response;
				response = xhr.responseText;
			}

			if(status == 'success') {
				statusMessage(xhr.statusText, "good");
				$(this).each(callback, [response, status, xhr]);
			} else {
				errorMessage(xhr.statusText);
				if(failureCallback) $(this).each(failureCallback, [response, status, xhr]);
			}
		}
	}
	
})
})(jQuery);