<?php
/**
 * NetCommonsApp Model
 *
 * @author Jun Nishikawa <topaz2@m0n0m0n0.com>
 * @author Takako Miyagawa <nekoget@gmail.com>
 * @link http://www.netcommons.org NetCommons Project
 * @license http://www.netcommons.org/license.txt NetCommons License
 * @copyright Copyright 2014, NetCommons Project
 */

App::uses('Model', 'Model');

/**
 * NetCommonsApp Model
 *
 * CakePHPのModelクラスを継承してます。<br>
 * ドキュメントルートのapp.Mode.AppModelはこのクラスを継承しているので、<br>
 * 全モデルの基底クラスになります。<br>
 * Overrideしているメソッドもあり、CakePHPの通常動作と異なるものがありますので注意して下さい。
 *
 * #### CakePHPのModel処理をOverrideしているメソッドです。
 * [__construct](#__construct)<br>
 * [setDataSource](#setdatasource)<br>
 * [create](#create)<br>
 *
 * @author Jun Nishikawa <topaz2@m0n0m0n0.com>
 * @author Takako Miyagawa <nekoget@gmail.com>
 * @package NetCommons\NetCommons\Model
 * @SuppressWarnings(PHPMD.NumberOfChildren)
 */
class NetCommonsAppModel extends Model {

/**
 * use behaviors
 *
 * @var array
 */
	public $actsAs = array(
		'NetCommons.Trackable',
	);

/**
 * Validation rules
 *
 * @var array
 */
	public $validate = array();

/**
 * 接続先DB　master slave変更用
 *
 * @var string
 */
	private static $__changeDbConfig;

/**
 * 接続先DB　古いslave保存用
 *
 * @var string
 */
	private static $__oldSlaveDbConfig;

/**
 * Constructor. DataSourceの選択
 *
 * 接続先DBをランダムに選択します。
 *
 * @param bool|int|string|array $id Set this ID for this model on startup,
 * can also be an array of options, see above.
 * @param string $table Name of database table to use.
 * @param string $ds DataSource connection name.
 * @return void
 * @SuppressWarnings(PHPMD.BooleanArgumentFlag)
 */
	public function __construct($id = false, $table = null, $ds = null) {
		// If a datasource is set via params, use it and return
		if ((is_array($id) && isset($id['ds'])) || $ds) {
			parent::__construct($id, $table, $ds);
			return;
		}

		// Use a static variable, to only use one connection per page-call (otherwise we would get a new handle every time a Model is created)
		static $_useDbConfig;
		if (!isset($_useDbConfig)) {
			$_useDbConfig = $this->__getRandomlySlave();
		}
		$this->useDbConfig = $_useDbConfig;

		parent::__construct($id, $table, $ds);
	}

/**
 * Find the slaves we have
 *
 * @return string The name of the DataSource, as defined in app/Config/database.php
 */
	private function __getRandomlySlave() {
		if ($this->useDbConfig === 'test') {
			return $this->useDbConfig;
		}
		// Get all available database-configs
		$sources = ConnectionManager::enumConnectionObjects();

		// Find the slaves we have
		$slaves = array();
		foreach ($sources as $name => $values) {
			unset($values);
			// Slaves have to be named "slave1", "slave2", etc...
			if (preg_match('/^slave[0-9]+$/i', $name) == 1) {
				$slaves[] = $name;
			}
		}

		// Randomly use a slave
		$dataSource = (count($slaves) !== 0) ? $slaves[rand(0, count($slaves) - 1)] : 'master';
		return $dataSource;
	}

/**
 * Masterの接続先に変更する。
 *
 * @return void
 */
	public function setMasterDataSource() {
		self::$__changeDbConfig = 'master';
	}

/**
 * 以前のSlaveの接続先に戻す。なければ、ランダムに選択
 *
 * @return void
 */
	public function setSlaveDataSource() {
		if (self::$__oldSlaveDbConfig) {
			self::$__changeDbConfig = self::$__oldSlaveDbConfig;
			return;
		}
		self::$__changeDbConfig = $this->__getRandomlySlave();
	}

/**
 * Gets the DataSource to which this model is bound.
 *
 * @return DataSource A DataSource object
 */
	public function getDataSource() {
		// MasterDBに切り替え処理
		$this->__changeDataSource();

		return parent::getDataSource();
	}

/**
 * MasterDBに切り替える処理
 *
 * @return void
 */
	private function __changeDataSource() {
		if (!empty(self::$__changeDbConfig) &&
				self::$__changeDbConfig !== $this->useDbConfig && $this->useDbConfig !== 'test') {
			self::$__oldSlaveDbConfig = $this->useDbConfig;
			$this->useDbConfig = self::$__changeDbConfig;
			$this->_sourceConfigured = false;
			//self::$__changeDbConfig = null;

			$associations = Hash::merge(
				array_keys($this->hasOne),
				array_keys($this->hasMany),
				array_keys($this->belongsTo),
				array_keys($this->hasAndBelongsToMany)
			);
			foreach ($associations as $btModelName) {
				$this->{$btModelName}->useDbConfig = $this->useDbConfig;
				if ($this->{$btModelName}->useTable !== false) {
					$this->{$btModelName}->setSource($this->{$btModelName}->useTable);
				}
			}

		}
	}

/**
 * NetCommonsで使用する共通の値がセットされた結果を返します。<br>
 * CakePHPのSchemaは、not null指定されたカラムのdefaultがnullになっているため、<br>
 * ''(長さ0の文字列)に書き換えています。<br>
 * https://github.com/NetCommons3/NetCommons3/issues/7
 *
 * #### セットされるデータ
 * ```
 * 'room_id' => Current::read('Room.id'),
 * 'language_id' => Current::read('Language.id'),
 * 'block_id' => Current::read('Block.id'),
 * 'block_key' => Current::read('Block.key'),
 * 'frame_id' => Current::read('Frame.id'),
 * 'frame_key' => Current::read('Frame.key'),
 * 'plugin_key' => Inflector::underscore($this->plugin),
 * ```
 *
 * @param bool|array $data Optional data array to assign to the model after it is created. If null or false,
 *   schema data defaults are not merged.
 * @param bool $filterKey If true, overwrites any primary key input with an empty value
 *
 * @return array The current Model::data; after merging $data and/or defaults from database
 * @link http://book.cakephp.org/2.0/en/models/saving-your-data.html#model-create-array-data-array
 * @SuppressWarnings(PHPMD.BooleanArgumentFlag)
 */
	public function create($data = array(), $filterKey = false) {
		if ($data !== null && $data !== false) {
			if (empty($data[$this->alias])) {
				$data = $this->_setAliasData($data);
			}

			$options = $this->_getDefaultValue();
			$data = Hash::merge($options, $data);
		}

		return parent::create($data, $filterKey);
	}

/**
 * Initializes the model for writing a new record, loading the default values
 * for those fields that are not defined in $data, and clearing previous validation errors.
 * Especially helpful for saving data in loops.
 *
 * @param bool|array $data Optional data array to assign to the model after it is created. If null or false,
 *   schema data defaults are not merged.
 * @param bool $filterKey If true, overwrites any primary key input with an empty value
 *
 * @return array The current Model::data; after merging $data and/or defaults from database
 * @link http://book.cakephp.org/2.0/en/models/saving-your-data.html#model-create-array-data-array
 * @SuppressWarnings(PHPMD.BooleanArgumentFlag)
 */
	public function createAll($data = array(), $filterKey = false) {
		$newRecord = $this->create($data, $filterKey);
		$associations = Hash::merge(
			array_keys($this->hasOne),
			array_keys($this->belongsTo)
		);
		foreach ($associations as $model) {
			if ($model === 'TrackableCreator' || $model === 'TrackableUpdater') {
				continue;
			}

			if (isset($data[$model])) {
				$options = $data[$model];
			} else {
				$options = array();
			}
			$newRecord = Hash::merge($newRecord, $this->$model->create($options, $filterKey));
		}

		return $newRecord;
	}

/**
 * transaction begin
 *
 * @return void
 */
	public function begin() {
		$this->setMasterDataSource();
		$dataSource = $this->getDataSource();
		$dataSource->begin();
	}

/**
 * transaction commit
 *
 * @return void
 */
	public function commit() {
		$dataSource = $this->getDataSource();
		$dataSource->commit();
	}

/**
 * transaction rollback
 *
 * @param mixed $ex Exception
 * @return void
 * @throws Exception
 */
	public function rollback($ex = null) {
		$dataSource = $this->getDataSource();
		$dataSource->rollback();
		if ($ex) {
			if ($this->useDbConfig !== 'test') {
				CakeLog::error($ex);
			}
			throw $ex;
		}
	}

/**
 * Load models
 *
 * @param array $models models to load
 * @return void
 */
	public function loadModels(array $models = []) {
		foreach ($models as $model => $class) {
			$this->$model = ClassRegistry::init($class, true);
			//if ($this->$model->useDbConfig !== 'test') {
			//	$this->$model->setDataSource($source);
			//}
		}
	}

/**
 * 全カラムのデフォルト値をセットした配列を返す。
 *
 * @return array デフォルト値をセットした配列
 */
	protected function _getDefaultValue() {
		$options = array();

		$currents = array();
		if (class_exists('Current')) {
			$currents = array(
				'room_id' => Current::read('Room.id'),
				'language_id' => Current::read('Language.id'),
				'block_id' => Current::read('Block.id'),
				'block_key' => Current::read('Block.key'),
				'frame_id' => Current::read('Frame.id'),
				'frame_key' => Current::read('Frame.key'),
				'plugin_key' => Inflector::underscore($this->plugin),
			);
		}

		foreach ($this->schema() as $fieldName => $fieldDetail) {
			if ($fieldName !== $this->primaryKey) {
				if (($fieldDetail['null'] === false) && ($fieldDetail['default'] === null)) {
					// not nullカラムのdefault指定がなかったら空文字にしておく。 @see https://github.com/NetCommons3/NetCommons3/issues/7
					$options[$fieldName] = '';
				} else {
					$options[$fieldName] = $fieldDetail['default'];
				}
			}
			// Currentの値をセット
			if (isset($currents[$fieldName])) {
				$options[$fieldName] = $currents[$fieldName];
			}
		}

		$options = $this->_setAliasData($options);
		return $options;
	}
}