var Model = require ('./model');

module.exports = new Class
({
	Implements: Vn.Lot
	,Properties:
	{
		/**
		 * The model associated to this form.
		 */
		model:
		{ 
			type: Model
		},
		/**
		 * The row where the form positioned, has -1 if the row is unselected.
		 */
		row:
		{ 
			type: Number
		},
		/**
		 * The number of rows in the form.
		 */
		numRows:
		{
			type: Number
		},
		/**
		 * The current row parameters.
		 */
		params:
		{
			type: Object
			,set: function (x)
			{
				this.assign (x);
			}
			,get: function ()
			{
				var params = {};
				var keys = this.keys ();

				for (var i = 0; i < keys.length; i++)
				{
					var key = keys[i];
					params[key] = this.get (key);
				}

				return params;
			}
		},
		/**
		 * Checks if the form data is ready.
		 */
		ready:
		{
			type: Boolean
		}
	}

	,_model: null
	,_row: -1
	
	,refresh: function ()
	{
		if (this._model)
			this._model.refresh ();
	}
	
	/**
	 * Get the index of the column from its name.
	 *
	 * @param {String} columnName The column name
	 * @return {integer} The column index or -1 if column not exists
	 */
	,getColumnIndex: function (columnName)
	{
		if (this._model)
			return this._model.getColumnIndex (columnName);
			
		return -1;
	}
	
	,insertRow: function ()
	{
		if (this._model)
			this.row = this._model.insertRow ();
	}
	
	,performOperations: function ()
	{
		if (this._model)
			this._model.performOperations ();
	}

	/**
	 * Removes the current row.
	 */
	,deleteRow: function ()
	{
		if (this._row >= 0)
			this._model.deleteRow (this._row);
	}
	
	/**
	 * Gets a value from the form.
	 *
	 * @param {String} columnName The column name
	 * @return {Object} The value
	 */
	,get: function (columnName)
	{
		if (this._model)
			return this._model.get (this._row, columnName);

		return undefined;
	}

	/**
	 * Sets a value on the form.
	 *
	 * @param {String} columnName The column name
	 * @param {Object} value The new value
	 */
	,set: function (columnName, value)
	{
		return this._model.set (this._row, columnName, value);
	}

	/**
	 * Gets a value from the form using the column index.
	 *
	 * @param {String} columnName The column index
	 * @return {Object} The value
	 */
	,getByIndex: function (column)
	{
		return this._model.getByIndex (this._row, column);
	}

	/**
	 * Sets a value on the form using the column index.
	 *
	 * @param {String} columnName The column index
	 * @param {Object} value The new value
	 */
	,setByIndex: function (column, value)
	{
		return this._model.setByIndex (this._row, column, value);
	}

	,keys: function ()
	{
		if (this._model && this._model.ready)
			return Object.keys (this._model.columnMap);

		return [];
	}
	
	,getParams: function ()
	{
		var params = {};
		var keys = this.keys ();

		for (var i = 0; i < keys.length; i++)
		{
			var key = keys[i];
			params[key] = this.get (key);
		}

		return params;
	}
});