<?php
/**
 * @package     FOF
 * @copyright   2010-2016 Nicholas K. Dionysopoulos / Akeeba Ltd
 * @license     GNU GPL version 2 or later
 */

namespace FOF30\Configuration\Domain;

use SimpleXMLElement;

defined('_JEXEC') or die;

/**
 * Configuration parser for the models-specific settings
 *
 * @since    2.1
 */
class Models implements DomainInterface
{
	/**
	 * Parse the XML data, adding them to the $ret array
	 *
	 * @param   SimpleXMLElement $xml  The XML data of the component's configuration area
	 * @param   array            &$ret The parsed data, in the form of a hash array
	 *
	 * @return  void
	 */
	public function parseDomain(SimpleXMLElement $xml, array &$ret)
	{
		// Initialise
		$ret['models'] = array();

		// Parse model configuration
		$modelsData = $xml->xpath('model');

		// Sanity check
		if (empty($modelsData))
		{
			return;
		}

		foreach ($modelsData as $aModel)
		{
			$key = (string) $aModel['name'];

			$ret['models'][ $key ]['behaviors']      = array();
			$ret['models'][ $key ]['behaviorsMerge'] = false;
			$ret['models'][ $key ]['tablealias']     = $aModel->xpath('tablealias');
			$ret['models'][ $key ]['fields']         = array();
			$ret['models'][ $key ]['relations']      = array();
			$ret['models'][ $key ]['config']         = array();


			// Parse configuration
			$optionData = $aModel->xpath('config/option');

			if (!empty($optionData))
			{
				foreach ($optionData as $option)
				{
					$k                                     = (string) $option['name'];
					$ret['models'][ $key ]['config'][ $k ] = (string) $option;
				}
			}

			// Parse field aliases
			$fieldData = $aModel->xpath('field');

			if (!empty($fieldData))
			{
				foreach ($fieldData as $field)
				{
					$k                                     = (string) $field['name'];
					$ret['models'][ $key ]['fields'][ $k ] = (string) $field;
				}
			}

			// Parse behaviours
			$behaviorsData  = (string) $aModel->behaviors;
			$behaviorsMerge = (string) $aModel->behaviors['merge'];

			if (!empty($behaviorsMerge))
			{
				$behaviorsMerge = trim($behaviorsMerge);
				$behaviorsMerge = strtoupper($behaviorsMerge);

				if (in_array($behaviorsMerge, array('1', 'YES', 'ON', 'TRUE')))
				{
					$ret['models'][ $key ]['behaviorsMerge'] = true;
				}
			}

			if (!empty($behaviorsData))
			{
				$behaviorsData = explode(',', $behaviorsData);

				foreach ($behaviorsData as $behavior)
				{
					$behavior = trim($behavior);

					if (empty($behavior))
					{
						continue;
					}

					$ret['models'][ $key ]['behaviors'][] = $behavior;
				}
			}

			// Parse relations
			$relationsData = $aModel->xpath('relation');

			if (!empty($relationsData))
			{
				foreach ($relationsData as $relationData)
				{
					$type     = (string) $relationData['type'];
					$itemName = (string) $relationData['name'];

					if (empty($type) || empty($itemName))
					{
						continue;
					}

					$modelClass    = (string) $relationData['foreignModelClass'];
					$localKey      = (string) $relationData['localKey'];
					$foreignKey    = (string) $relationData['foreignKey'];
					$pivotTable    = (string) $relationData['pivotTable'];
					$ourPivotKey   = (string) $relationData['pivotLocalKey'];
					$theirPivotKey = (string) $relationData['pivotForeignKey'];

					$relation = array(
						'type'              => $type,
						'itemName'          => $itemName,
						'foreignModelClass' => empty($modelClass) ? null : $modelClass,
						'localKey'          => empty($localKey) ? null : $localKey,
						'foreignKey'        => empty($foreignKey) ? null : $foreignKey,
					);

					if (!empty($ourPivotKey) || !empty($theirPivotKey) || !empty($pivotTable))
					{
						$relation['pivotLocalKey']   = empty($ourPivotKey) ? null : $ourPivotKey;
						$relation['pivotForeignKey'] = empty($theirPivotKey) ? null : $theirPivotKey;
						$relation['pivotTable']      = empty($pivotTable) ? null : $pivotTable;
					}

					$ret['models'][ $key ]['relations'][] = $relation;
				}
			}
		}
	}

	/**
	 * Return a configuration variable
	 *
	 * @param   string &$configuration Configuration variables (hashed array)
	 * @param   string $var            The variable we want to fetch
	 * @param   mixed  $default        Default value
	 *
	 * @return  mixed  The variable's value
	 */
	public function get(&$configuration, $var, $default)
	{
		$parts = explode('.', $var);

		$view   = $parts[0];
		$method = 'get' . ucfirst($parts[1]);

		if (!method_exists($this, $method))
		{
			return $default;
		}

		array_shift($parts);
		array_shift($parts);

		$ret = $this->$method($view, $configuration, $parts, $default);

		return $ret;
	}

	/**
	 * Internal method to return the magic field mapping
	 *
	 * @param   string $model          The model for which we will be fetching a field map
	 * @param   array  &$configuration The configuration parameters hash array
	 * @param   array  $params         Extra options
	 * @param   string $default        Default magic field mapping; empty if not defined
	 *
	 * @return  array   Field map
	 */
	protected function getField($model, &$configuration, $params, $default = '')
	{
		$fieldmap = array();

		if (isset($configuration['models']['*']) && isset($configuration['models']['*']['fields']))
		{
			$fieldmap = $configuration['models']['*']['fields'];
		}

		if (isset($configuration['models'][ $model ]) && isset($configuration['models'][ $model ]['fields']))
		{
			$fieldmap = array_merge($fieldmap, $configuration['models'][ $model ]['fields']);
		}

		$map = $default;

		if (empty($params[0]) || ($params[0] == '*'))
		{
			$map = $fieldmap;
		}
		elseif (isset($fieldmap[ $params[0] ]))
		{
			$map = $fieldmap[ $params[0] ];
		}

		return $map;
	}

	/**
	 * Internal method to get model alias
	 *
	 * @param   string $model          The model for which we will be fetching table alias
	 * @param   array  &$configuration The configuration parameters hash array
	 * @param   array  $params         Ignored
	 * @param   string $default        Default table alias
	 *
	 * @return  string  Table alias
	 */
	protected function getTablealias($model, &$configuration, $params, $default = '')
	{
		$tableMap = array();

		if (isset($configuration['models']['*']['tablealias']))
		{
			$tableMap = $configuration['models']['*']['tablealias'];
		}

		if (isset($configuration['models'][ $model ]['tablealias']))
		{
			$tableMap = array_merge($tableMap, $configuration['models'][ $model ]['tablealias']);
		}

		if (empty($tableMap))
		{
			return null;
		}

		return $tableMap[0];
	}

	/**
	 * Internal method to get model behaviours
	 *
	 * @param   string $model          The model for which we will be fetching behaviours
	 * @param   array  &$configuration The configuration parameters hash array
	 * @param   array  $params         Unused
	 * @param   string $default        Default behaviour
	 *
	 * @return  string  Model behaviours
	 */
	protected function getBehaviors($model, &$configuration, $params, $default = '')
	{
		$behaviors = $default;

		if (isset($configuration['models']['*'])
		    && isset($configuration['models']['*']['behaviors'])
		)
		{
			$behaviors = $configuration['models']['*']['behaviors'];
		}

		if (isset($configuration['models'][ $model ])
		    && isset($configuration['models'][ $model ]['behaviors'])
		)
		{
			$merge = false;

			if (isset($configuration['models'][ $model ])
			    && isset($configuration['models'][ $model ]['behaviorsMerge'])
			)
			{
				$merge = (bool) $configuration['models'][ $model ]['behaviorsMerge'];
			}

			if ($merge)
			{
				$behaviors = array_merge($behaviors, $configuration['models'][ $model ]['behaviors']);
			}
			else
			{
				$behaviors = $configuration['models'][ $model ]['behaviors'];
			}
		}

		return $behaviors;
	}

	/**
	 * Internal method to get model relations
	 *
	 * @param   string $model          The model for which we will be fetching relations
	 * @param   array  &$configuration The configuration parameters hash array
	 * @param   array  $params         Unused
	 * @param   string $default        Default relations
	 *
	 * @return  array   Model relations
	 */
	protected function getRelations($model, &$configuration, $params, $default = '')
	{
		$relations = $default;

		if (isset($configuration['models']['*'])
		    && isset($configuration['models']['*']['relations'])
		)
		{
			$relations = $configuration['models']['*']['relations'];
		}

		if (isset($configuration['models'][ $model ])
		    && isset($configuration['models'][ $model ]['relations'])
		)
		{
			$relations = $configuration['models'][ $model ]['relations'];
		}

		return $relations;
	}

	/**
	 * Internal method to return the a configuration option for the Model.
	 *
	 * @param   string $model          The view for which we will be fetching a task map
	 * @param   array  &$configuration The configuration parameters hash array
	 * @param   array  $params         Extra options; key 0 defines the option variable we want to fetch
	 * @param   mixed  $default        Default option; null if not defined
	 *
	 * @return  string  The setting for the requested option
	 */
	protected function getConfig($model, &$configuration, $params, $default = null)
	{
		$ret = $default;

		$config = array();

		if (isset($configuration['models']['*']['config']))
		{
			$config = $configuration['models']['*']['config'];
		}

		if (isset($configuration['models'][ $model ]['config']))
		{
			$config = array_merge($config, $configuration['models'][ $model ]['config']);
		}

		if (empty($params) || empty($params[0]))
		{
			return $config;
		}

		if (isset($config[ $params[0] ]))
		{
			$ret = $config[ $params[0] ];
		}

		return $ret;
	}
}