<?php
/**
 * TScaffoldEditView class and IScaffoldEditRenderer interface file.
 *
 * @author Wei Zhuo <weizhuo[at]gmail[dot]com>
 * @link http://www.pradosoft.com/
 * @copyright Copyright &copy; 2005-2008 PradoSoft
 * @license http://www.pradosoft.com/license/
 * @version $Id$
 * @package System.Data.ActiveRecord.Scaffold
 */

/**
 * Load scaffold base.
 */
Prado::using('System.Data.ActiveRecord.Scaffold.TScaffoldBase');

/**
 * Template control for editing an Active Record instance.
 * The <b>RecordClass</b> determines the Active Record class to be edited.
 * A particular record can be edited by specifying the {@link setRecordPk RecordPk}
 * value (may be an array for composite keys).
 *
 * The default editor input controls are created based on the column types.
 * The editor layout can be specified by a renderer by set the value
 * of the {@link setEditRenderer EditRenderer} property to the class name of a
 * class that implements TScaffoldEditRenderer. A renderer is an external
 * template control that implements IScaffoldEditRenderer.
 *
 * The <b>Data</b> of the IScaffoldEditRenderer will be set as the current Active
 * Record to be edited. The <b>UpdateRecord()</b> method of IScaffoldEditRenderer
 * is called when request to save the record is requested.
 *
 * Validators in the custom external editor template should have the
 * {@link TBaseValidator::setValidationGroup ValidationGroup} property set to the
 * value of the {@link getValidationGroup} of the TScaffoldEditView instance
 * (the edit view instance is the <b>Parent</b> of the IScaffoldEditRenderer in most
 * cases.
 *
 * Cosmetic changes to the default editor should be done using Cascading Stylesheets.
 * For example, a particular field/property can be hidden by specifying "display:none" for
 * the corresponding style (each field/property has unique Css class name as "property_xxx", where
 * xxx is the property name).
 *
 * @author Wei Zhuo <weizho[at]gmail[dot]com>
 * @version $Id$
 * @package System.Data.ActiveRecord.Scaffold
 * @since 3.1
 */
class TScaffoldEditView extends TScaffoldBase
{
	/**
	 * @var IScaffoldEditRenderer custom scaffold edit renderer
	 */
	private $_editRenderer;

	/**
	 * Initialize the editor form if it is Visible.
	 */
	public function onLoad($param)
	{
		if($this->getVisible())
			$this->initializeEditForm();
	}

	/**
	 * @return string the class name for scaffold editor. Defaults to empty, meaning not set.
	 */
	public function getEditRenderer()
	{
		return $this->getViewState('EditRenderer', '');
	}

	/**
	 * @param string the class name for scaffold editor. Defaults to empty, meaning not set.
	 */
	public function setEditRenderer($value)
	{
		$this->setViewState('EditRenderer', $value, '');
	}

	/**
	 * @param array Active Record primary key value to be edited.
	 */
	public function setRecordPk($value)
	{
		$this->clearRecordObject();
		$val = TPropertyValue::ensureArray($value);
		$this->setViewState('PK', count($val) > 0 ? $val : null);
	}

	/**
	 * @return array Active Record primary key value.
	 */
	public function getRecordPk()
	{
		return $this->getViewState('PK');
	}

	/**
	 * @return TActiveRecord current Active Record instance
	 */
	protected function getCurrentRecord()
	{
		return $this->getRecordObject($this->getRecordPk());
	}

	/**
	 * Initialize the editor form
	 */
	public function initializeEditForm()
	{
		$record = $this->getCurrentRecord();
		$classPath = $this->getEditRenderer();
		if($classPath === '')
		{
			$columns = $this->getTableInfo()->getColumns();
			$this->getInputRepeater()->setDataSource($columns);
			$this->getInputRepeater()->dataBind();
		}
		else
		{
			if($this->_editRenderer===null)
				$this->createEditRenderer($record, $classPath);
			else
				$this->_editRenderer->setData($record);
		}
	}

	/**
	 * Instantiate the external edit renderer.
	 * @param TActiveRecord record to be edited
	 * @param string external edit renderer class name.
	 * @throws TConfigurationException raised when renderer is not an
	 * instance of IScaffoldEditRenderer.
	 */
	protected function createEditRenderer($record, $classPath)
	{
		$this->_editRenderer = Prado::createComponent($classPath);
		if($this->_editRenderer instanceof IScaffoldEditRenderer)
		{
			$index = $this->getControls()->remove($this->getInputRepeater());
			$this->getControls()->insertAt($index,$this->_editRenderer);
			$this->_editRenderer->setData($record);
		}
		else
		{
			throw new TConfigurationException(
				'scaffold_invalid_edit_renderer', $this->getID(), get_class($record));
		}
	}

	/**
	 * Initialize the default editor using the scaffold input builder.
	 */
	protected function createRepeaterEditItem($sender, $param)
	{
		$type = $param->getItem()->getItemType();
		if($type==TListItemType::Item || $type==TListItemType::AlternatingItem)
		{
			$item = $param->getItem();
			$column = $item->getDataItem();
			if($column===null)
				return;

			$record = $this->getCurrentRecord();
			$builder = $this->getScaffoldInputBuilder($record);
			$builder->createScaffoldInput($this, $item, $column, $record);
		}
	}

	/**
	 * Bubble the command name event. Stops bubbling when the page validator false.
	 * Otherwise, the bubble event is continued.
	 */
	public function bubbleEvent($sender, $param)
	{
		switch(strtolower($param->getCommandName()))
		{
			case 'save':
				return $this->doSave() ? false : true;
			case 'clear':
				$this->setRecordPk(null);
				$this->initializeEditForm();
				return false;
			default:
				return false;
		}
	}

	/**
	 * Check the validators, then tries to save the record.
	 * @return boolean true if the validators are true, false otherwise.
	 */
	protected function doSave()
	{
		if($this->getPage()->getIsValid())
		{
			$record = $this->getCurrentRecord();
			if($this->_editRenderer===null)
			{
				$table = $this->getTableInfo();
				$builder = $this->getScaffoldInputBuilder($record);
				foreach($this->getInputRepeater()->getItems() as $item)
				{
					$column = $table->getColumn($item->getCustomData());
					$builder->loadScaffoldInput($this, $item, $column, $record);
				}
			}
			else
			{
				$this->_editRenderer->updateRecord($record);
			}
			$record->save();
			return true;
		}
		else if($this->_editRenderer!==null)
		{
			//preserve the form data.
			$this->_editRenderer->updateRecord($this->getCurrentRecord());
		}

		return false;
	}

	/**
	 * @return TRepeater default editor input controls repeater
	 */
	protected function getInputRepeater()
	{
		$this->ensureChildControls();
		return $this->getRegisteredObject('_repeater');
	}

	/**
	 * @return TButton Button triggered to save the Active Record.
	 */
	public function getSaveButton()
	{
		$this->ensureChildControls();
		return $this->getRegisteredObject('_save');
	}

	/**
	 * @return TButton Button to clear the editor inputs.
	 */
	public function getClearButton()
	{
		$this->ensureChildControls();
		return $this->getRegisteredObject('_clear');
	}

	/**
	 * @return TButton Button to cancel the edit action (e.g. hide the edit view).
	 */
	public function getCancelButton()
	{
		$this->ensureChildControls();
		return $this->getRegisteredObject('_cancel');
	}

	/**
	 * Create the default scaffold editor control factory.
	 * @param TActiveRecord record instance.
	 * @return TScaffoldInputBase scaffold editor control factory.
	 */
	protected function getScaffoldInputBuilder($record)
	{
		static $_builders=array();
		$class = get_class($record);
		if(!isset($_builders[$class]))
		{
			Prado::using('System.Data.ActiveRecord.Scaffold.InputBuilder.TScaffoldInputBase');
			$_builders[$class] = TScaffoldInputBase::createInputBuilder($record);
		}
		return $_builders[$class];
	}

	/**
	 * @return string editor validation group name.
	 */
	public function getValidationGroup()
	{
		return 'group_'.$this->getUniqueID();
	}
}

/**
 * IScaffoldEditRenderer interface.
 *
 * IScaffoldEditRenderer defines the interface that an edit renderer
 * needs to implement. Besides the {@link getData Data} property, an edit
 * renderer also needs to provide {@link updateRecord updateRecord} method
 * that is called before the save() method is called on the TActiveRecord.
 *
 * @author Wei Zhuo <weizho[at]gmail[dot]com>
 * @version $Id$
 * @package System.Data.ActiveRecord.Scaffold
 * @since 3.1
 */
interface IScaffoldEditRenderer extends IDataRenderer
{
	/**
	 * This method should update the record with the user input data.
	 * @param TActiveRecord record to be saved.
	 */
	public function updateRecord($record);
}