<?php
/**
 *## EditableSaver class file.
 *
 * @author Vitaliy Potapov <noginsk@rambler.ru>
 * @link https://github.com/vitalets/x-editable-yii
 * @copyright Copyright &copy; Vitaliy Potapov 2012
 * @version 1.1.0
 */

/**
 * EditableSaver helps to update model by editable widget submit request.
 *
 * @package booster.widgets.supplementary
*/
class TbEditableSaver extends CComponent
{
	/**
	 * scenarion used in model for update
	 *
	 * @var mixed
	 */
	public $scenario = 'editable';

	/**
	 * name of model
	 *
	 * @var mixed
	 */
	public $modelClass;
	/**
	 * primaryKey value
	 *
	 * @var mixed
	 */
	public $primaryKey;
	/**
	 * name of attribute to be updated
	 *
	 * @var mixed
	 */
	public $attribute;
	/**
	 * model instance
	 *
	 * @var CActiveRecord
	 */
	public $model;

	/**
	 * @var mixed new value of attribute
	 */
	public $value;

	/**
	 * http status code returned in case of error
	 */
	public $errorHttpCode = 400;

	/**
	 * name of changed attributes. Used when saving model
	 *
	 * @var mixed
	 */
	protected $changedAttributes = array();

	/**
	 *### ._construct()
	 *
	 * Constructor
	 *
	 * @param $modelClass
	 *
	 * @throws CException
	 * @internal param mixed $modelName
	 * @return \TbEditableSaver
	 */
	public function __construct($modelClass)
	{
		if (empty($modelClass)) {
			throw new CException(Yii::t(
				'TbEditableSaver.editable',
				'You should provide modelClass in constructor of EditableSaver.'
			));
		}

		$this->modelClass = $modelClass;

		//for non-namespaced models do ucfirst (for backwards compability)
		//see https://github.com/vitalets/x-editable-yii/issues/9
		if (strpos($this->modelClass, '\\') === false) {
			$this->modelClass = ucfirst($this->modelClass);
		}
	}

	/**
	 *### .update()
	 *
	 * main function called to update column in database
	 *
	 */
	public function update()
	{
		//get params from request
		$this->primaryKey = yii::app()->request->getParam('pk');
		$this->attribute = yii::app()->request->getParam('name');
		$this->value = yii::app()->request->getParam('value');

		//checking params
		if (empty($this->attribute)) {
			throw new CException(Yii::t('TbEditableSaver.editable', 'Property "attribute" should be defined.'));
		}
		if (empty($this->primaryKey)) {
			throw new CException(Yii::t('TbEditableSaver.editable', 'Property "primaryKey" should be defined.'));
		}

		//loading model
		$this->model = CActiveRecord::model($this->modelClass)->findByPk($this->primaryKey);
		if (!$this->model) {
			throw new CException(Yii::t(
				'TbEditableSaver.editable',
				'Model {class} not found by primary key "{pk}"',
				array(
					'{class}' => get_class($this->model),
					'{pk}' => is_array($this->primaryKey) ? CJSON::encode($this->primaryKey) : $this->primaryKey
				)
			));
		}

		//set scenario
		$this->model->setScenario($this->scenario);

		//commented to be able to work with virtual attributes
		//see https://github.com/vitalets/yii-bootstrap-editable/issues/15
		/*
		//is attribute exists
		if (!$this->model->hasAttribute($this->attribute)) {
			throw new CException(Yii::t('EditableSaver.editable', 'Model {class} does not have attribute "{attr}"', array(
			  '{class}'=>get_class($this->model), '{attr}'=>$this->attribute)));
		}
		*/

		//is attribute safe
		if (!$this->model->isAttributeSafe($this->attribute)) {
			throw new CException(Yii::t(
				'editable',
				'Model {class} rules do not allow to update attribute "{attr}"',
				array(
					'{class}' => get_class($this->model),
					'{attr}' => $this->attribute
				)
			));
		}

		//setting new value
		$this->setAttribute($this->attribute, $this->value);

		//validate attribute
		$this->model->validate(array($this->attribute));
		$this->checkErrors();

		//trigger beforeUpdate event
		$this->beforeUpdate();
		$this->checkErrors();

		//saving (no validation, only changed attributes)
		if ($this->model->save(false, $this->changedAttributes)) {
			//trigger afterUpdate event
			$this->afterUpdate();
		} else {
			$this->error(Yii::t('TbEditableSaver.editable', 'Error while saving record!'));
		}
	}

	/**
	 *### .checkErros()
	 *
	 * errors as CHttpException
	 * @internal param $msg
	 * @throws CHttpException
	 */
	public function checkErrors()
	{
		if ($this->model->hasErrors()) {
			$msg = array();
			foreach ($this->model->getErrors() as $attribute => $errors) {
				// TODO: make use of $attribute elements
				$msg = array_merge($msg, $errors);
			}
			// TODO: show several messages. should be checked in x-editable js
			//$this->error(join("\n", $msg));
			$this->error($msg[0]);
		}
	}

	/**
	 *### .error()
	 *
	 * errors as CHttpException
	 *
	 * @param $msg
	 *
	 * @throws CHttpException
	 */
	public function error($msg)
	{
		throw new CHttpException($this->errorHttpCode, $msg);
	}

	/**
	 *### .setAttribute()
	 *
	 * setting new value of attribute.
	 * Attrubute name also stored in array to save only changed attributes
	 *
	 * @param mixed $name
	 * @param mixed $value
	 */
	public function setAttribute($name, $value)
	{
		$this->model->$name = $value;
		if (!in_array($name, $this->changedAttributes)) {
			$this->changedAttributes[] = $name;
		}
	}

	/**
	 *### .onBeforeUpdate()
	 *
	 * This event is raised before the update is performed.
	 *
	 * @param CModelEvent $event the event parameter
	 */
	public function onBeforeUpdate($event)
	{
		$this->raiseEvent('onBeforeUpdate', $event);
	}

	/**
	 *### .onAfterUpdate()
	 *
	 * This event is raised after the update is performed.
	 *
	 * @param CModelEvent $event the event parameter
	 */
	public function onAfterUpdate($event)
	{
		$this->raiseEvent('onAfterUpdate', $event);
	}

	/**
	 *### .beforeUpdate()
	 *
	 * beforeUpdate
	 *
	 */
	protected function beforeUpdate()
	{
		$this->onBeforeUpdate(new CModelEvent($this));
	}

	/**
	 *### .afterUpdate()
	 *
	 * afterUpdate
	 *
	 */
	protected function afterUpdate()
	{
		$this->onAfterUpdate(new CModelEvent($this));
	}
}