/**
 * Global variables
 */
var configTabs; // Config tabs
var configDatatables = new Object(); // Datatables on the config page

/**
 * Set the datatable
 * 
 * @param id
 *            The ID of the datatable
 * @param obj
 *            Datatable object
 * @return Nothing
 */
function setConfigDatatable(id, obj) {
	configDatatables[id] = obj;
}

/**
 * Get the datatable with the given ID
 * 
 * @param id
 *            The ID of the datatable
 * @return Datatable object
 */
function getConfigDatatable(id) {
	return configDatatables[id];
}

/**
 * Set the configure tab
 * 
 * @param obj
 *            Tab object
 * @return Nothing
 */
function setConfigTab(obj) {
	configTabs = obj;
}

/**
 * Get the configure tab
 * 
 * @param Nothing
 * @return Tab object
 */
function getConfigTab() {
	return configTabs;
}

/**
 * Load configure page
 * 
 * @return Nothing
 */
function loadConfigPage() {
	// If the configure page has already been loaded
	if ($('#content').children().length) {
		// Do not reload configure page
		return;
	}

	// Create configure tab
	var tab = new Tab();
	setConfigTab(tab);
	tab.init();
	$('#content').append(tab.object());

	// Create loader
	var loader = createLoader();
	loader = $('<center></center>').append(loader);

	// Configure xCAT datable tables
	tab.add('configTablesTab', 'Tables', loader);

	// Add the update tab
	tab.add('updateTab', 'Update');

	// Get list of tables and their descriptions
	$.ajax( {
		url : 'lib/cmd.php',
		dataType : 'json',
		data : {
			cmd : 'tabdump',
			tgt : '',
			args : '-d',
			msg : ''
		},

		success : loadTableNames
	});

	loadUpdatePage();
}

/**
 * Load xCAT database table names and their descriptions
 * 
 * @param data
 *            Data returned from HTTP request
 * @return Nothing
 */
function loadTableNames(data) {
	// Get output
	var tables = data.rsp;

	// Remove loader
	var tabId = 'configTablesTab';
	$('#' + tabId).find('img').hide();

	// Create a groups division
	var tablesDIV = $('<div id="configTable"></div>');
	$('#' + tabId).append(tablesDIV);

	// Create info bar
	var infoBar = createInfoBar('Select a table to edit');
	tablesDIV.append(infoBar);

	// Create a list for the tables
	var list = $('<ul></ul>');
	// Loop through each table
	for ( var i = 0; i < tables.length; i++) {
		// Create a link for each table
		var args = tables[i].split(':');
		var link = $('<a href="#" id="' + args[0] + '">' + args[0] + '</a>');

		// Open table on click
		link.bind('click', function(e) {
			// Get table ID that was clicked
			var id = (e.target) ? e.target.id : e.srcElement.id;

			// Create loader
			var loader = createLoader();
			loader = $('<center></center>').append(loader);

			// Add a new tab for this table
			var configTab = getConfigTab();
			if (!$('#' + id + 'Tab').length) {
				configTab.add(id + 'Tab', id, loader);

				// Get contents of selected table
				$.ajax( {
					url : 'lib/cmd.php',
					dataType : 'json',
					data : {
						cmd : 'tabdump',
						tgt : '',
						args : id,
						msg : id
					},

					success : loadTable
				});
			}

			// Select new tab
			configTab.select(id + 'Tab');
		});

		var item = $('<li></li>');
		item.append(link);

		// Append the table description
		item.append(': ' + args[1]);

		// Append item to list
		list.append(item);
	}

	tablesDIV.append(list);
}

/**
 * Load a given database table
 * 
 * @param data
 *            Data returned from HTTP request
 * @return Nothing
 */
function loadTable(data) {
	// Get response
	var rsp = data.rsp;
	// Get table ID
	var id = data.msg;

	// Remove loader
	var tabId = id + 'Tab';
	$('#' + tabId).find('img').remove();

	// Create info bar
	var infoBar = createInfoBar('Click on a cell to edit.  Click outside the table to write to the cell.<br>Once you are satisfied with how the table looks, click on Save.');
	$('#' + tabId).append(infoBar);

	// Create action bar
	var actionBar = $('<div></div>');
	$('#' + tabId).append(actionBar);

	// Get table headers
	var args = rsp[0].replace('#', '');
	var headers = args.split(',');

	// Create container for original table contents
	var origCont = new Array(); // Original table content
	origCont[0] = rsp[0].split(','); // Headers

	// Create container for new table contents
	var newCont = new Object();
	var tmp = new Object();
	tmp[0] = '#' + headers[0]; // Put a # in front of the header
	for ( var i = 1; i < headers.length; i++) {
		tmp[i] = headers[i];
	}
	newCont[0] = tmp;

	// Create a new datatable
	var tableId = id + 'Datatable';
	var table = new DataTable(tableId);

	// Add column for the remove row button
	headers.unshift('');
	table.init(headers);
	headers.shift();

	// Append datatable to tab
	$('#' + tabId).append(table.object());

	// Data table
	var dTable;

	// Add table rows
	// Start with the 2nd row (1st row is the headers)
	for ( var i = 1; i < rsp.length; i++) {
		// Split into columns
		var cols = rsp[i].split(',');

		// Go through each column
		for ( var j = 0; j < cols.length; j++) {

			// If the column is not complete
			if (cols[j].count('"') == 1) {
				while (cols[j].count('"') != 2) {
					// Merge this column with the adjacent one
					cols[j] = cols[j] + "," + cols[j + 1];

					// Remove merged row
					cols.splice(j + 1, 1);
				}
			}

			// Replace quote
			cols[j] = cols[j].replace(new RegExp('"', 'g'), '');
		}

		// Add remove button
		cols.unshift('<span class="ui-icon ui-icon-close" onclick="deleteRow(this)"></span>');

		// Add row
		table.add(cols);

		// Save original table content
		origCont[i] = cols;
	}

	/**
	 * Enable editable columns
	 */
	// Do not make 1st column editable
	$('#' + tableId + ' td:not(td:nth-child(1))').editable(
		function(value, settings) {
			// Get column index
			var colPos = this.cellIndex;
			// Get row index
			var rowPos = dTable.fnGetPosition(this.parentNode);

			// Update datatable
			dTable.fnUpdate(value, rowPos, colPos);

			return (value);
		}, {
			onblur : 'submit', // Clicking outside editable area submits changes
			type : 'textarea',
			height : '30px' // The height of the text area
		});

	// Turn table into datatable
	dTable = $('#' + id + 'Datatable').dataTable();
	setConfigDatatable(id + 'Datatable', dTable);

	// Create add row button
	var addBar = $('<div></div>');
	$('#' + tabId).append(addBar);
	var addRowBtn = createButton('Add row');
	addBar.append(addRowBtn);

	// Create save and undo buttons
	var saveBtn = createButton('Save');
	var undoBtn = createButton('Undo');
	actionBar.append(saveBtn);
	actionBar.append(undoBtn);

	/**
	 * Add row
	 */
	addRowBtn.bind('click',	function(event) {
		// Create an empty row
		var row = new Array();

		/**
		 * Remove button
		 */
		row.push('<span class="ui-icon ui-icon-close" onclick="deleteRow(this)"></span>');
		for ( var i = 0; i < headers.length; i++) {
			row.push('');
		}

		// Get tab ID
		var tabId = $(this).parent().parent().attr('id');
		// Get table name
		var tableName = tabId.replace('Tab', '');
		// Get table ID
		var tableId = tableName + 'Datatable';

		// Get datatable
		var dTable = getConfigDatatable(tableId);
		// Add the row to the data table
		dTable.fnAddData(row);

		// Enable editable columns (again)
		// Do not make 1st column editable
		$('#' + tabId + ' td:not(td:nth-child(1))').editable(
			function(value, settings) {
				// Get column index
				var colPos = this.cellIndex;
				// Get row index
				var rowPos = dTable.fnGetPosition(this.parentNode);

				// Update datatable
				dTable.fnUpdate(value, rowPos, colPos);

				return (value);
			}, {
				onblur : 'submit', // Clicking outside editable area
				// submits changes
				type : 'textarea',
				height : '30px' // The height of the text area
			});
	});

	/**
	 * Save changes
	 */
	saveBtn.bind('click', function(event) {
		// Get tab ID
		var tabId = $(this).parent().parent().attr('id');
		// Get table name
		var tableName = tabId.replace('Tab', '');
		// Get table ID
		var tableId = tableName + 'Datatable';

		// Get datatable
		var dTable = getConfigDatatable(tableId);
		// Get the nodes from the table
		var dRows = dTable.fnGetNodes();

		// Go through each row
		for ( var i = 0; i < dRows.length; i++) {
			// If there is row with values
			if (dRows[i]) {
				// Go through each column
				// Ignore the 1st column because it is a button
				var cols = dRows[i].childNodes;
				var vals = new Object();
				for ( var j = 1; j < cols.length; j++) {
					var val = cols.item(j).firstChild.nodeValue;

					// Insert quotes
					if (val == 'Click to edit') {
						vals[j - 1] = '';
					} else {
						vals[j - 1] = val;
					}
				}

				// Save row
				newCont[i + 1] = vals;
			}
		}

		// Update datatable
		setConfigDatatable(tableId, dTable);

		// Update xCAT table
		$.ajax( {
			type : 'POST',
			url : 'lib/tabRestore.php',
			dataType : 'json',
			data : {
				table : tableName,
				cont : newCont
			},
			success : function(data) {
				alert('Changes saved');
			}
		});
	});

	/**
	 * Undo changes
	 */
	undoBtn.bind('click', function(event) {
		// Get tab ID
		var tabId = $(this).parent().parent().attr('id');
		// Get table name
		var tableName = tabId.replace('Tab', '');
		// Get table ID
		var tableId = tableName + 'Datatable';

		// Get datatable
		var dTable = getConfigDatatable(tableId);
		// Get the nodes from the table

		// Clear entire datatable
		dTable.fnClearTable();

		// Add original content back into datatable
		for ( var i = 1; i < origCont.length; i++) {
			dTable.fnAddData(origCont[i], true);
		}

		// Enable editable columns (again)
		// Do not make 1st column editable
		$('#' + tableId + ' td:not(td:nth-child(1))').editable(
			function(value, settings) {
				// Get column index
				var colPos = this.cellIndex;
				// Get row index
				var rowPos = dTable.fnGetPosition(this.parentNode);

				// Update datatable
				dTable.fnUpdate(value, rowPos, colPos);

				return (value);
			}, {
				onblur : 'submit', // Clicking outside editable area submits
				// changes
				type : 'textarea',
				height : '30px' // The height of the text area
			});
	});
}

/**
 * Delete a row in the data table
 * 
 * @param obj
 *            The object that was clicked
 * @return Nothing
 */
function deleteRow(obj) {
	// Get table ID
	var tableId = $(obj).parent().parent().parent().parent().attr('id');

	// Get datatable
	var dTable = getConfigDatatable(tableId);

	// Get all nodes within the datatable
	var rows = dTable.fnGetNodes();
	// Get target row
	var tgtRow = $(obj).parent().parent().get(0);

	// Find the target row in the datatable
	for ( var i in rows) {
		// If the row matches the target row
		if (rows[i] == tgtRow) {
			// Remove row
			dTable.fnDeleteRow(i, null, true);
			break;
		}
	}
}

/**
 * Count the number of occurrences of a specific character in a string
 * 
 * @param char
 *            Character to count
 * @return The number of occurrences
 */
String.prototype.count = function(char) {
	return (this.length - this.replace(new RegExp(char, "g"), '').length)/char.length;
};