<?php
/*
 *  $Id$
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * This software consists of voluntary contributions made by many individuals
 * and is licensed under the LGPL. For more information, see
 * <http://www.phpdoctrine.com>.
 */

/**
 * Doctrine_Plugin
 *
 * @author      Konsta Vesterinen <kvesteri@cc.hut.fi>
 * @package     Doctrine
 * @subpackage  Plugin
 * @license     http://www.opensource.org/licenses/lgpl-license.php LGPL
 * @version     $Revision$
 * @link        www.phpdoctrine.com
 * @since       1.0
 */
class Doctrine_Plugin 
{
    /**
     * @var array $_options     an array of plugin specific options
     */
    protected $_options = array('generateFiles' => false);
    /**
     * __get
     * an alias for getOption
     *
     * @param string $option
     */
    public function __get($option)
    {
        if (isset($this->_options[$option])) {
            return $this->_options[$option];
        }
        return null;
    }
    /**
     * __isset
     *
     * @param string $option
     */
    public function __isset($option) 
    {
        return isset($this->_options[$option]);
    }
    /**
     * returns the value of an option
     *
     * @param $option       the name of the option to retrieve
     * @return mixed        the value of the option
     */
    public function getOption($name)
    {
        if ( ! isset($this->_options[$name])) {
            throw new Doctrine_Plugin_Exception('Unknown option ' . $name);
        }
        
        return $this->_options[$name];
    }
    /**
     * sets given value to an option
     *
     * @param $option       the name of the option to be changed
     * @param $value        the value of the option
     * @return Doctrine_Plugin  this object
     */
    public function setOption($name, $value)
    {
        if ( ! isset($this->_options[$name])) {
            throw new Doctrine_Plugin_Exception('Unknown option ' . $name);
        }

        $this->_options[$name] = $value;
        
        return $this;
    }
    /**
     * returns all options and their associated values
     *
     * @return array    all options as an associative array
     */
    public function getOptions()
    {
        return $this->_options;
    }
    /**
     * generates foreign keys for the plugin table based on the owner table
     *
     * the foreign keys generated by this method can be used for 
     * setting the relations between the owner and the plugin classes
     *
     * @param Doctrine_Table $table     the table object that owns the plugin
     * @return array                    an array of foreign key definitions
     */
    public function generateForeignKeys(Doctrine_Table $table)
    {
        $fk = array();

        foreach ((array) $table->getIdentifier() as $column) {
            $def = $table->getDefinitionOf($column);

            unset($def['autoincrement']);
            unset($def['sequence']);
            unset($def['primary']);

            $col = $column;

            $def['primary'] = true;
            $fk[$col] = $def;
        }
        return $fk;
    }
    /**
     * generates a relation array to given table
     *
     * this method can be used for generating the relation from the plugin 
     * table to the owner table
     *
     * @param Doctrine_Table $table     the table object to construct the relation to
     * @param array $foreignKeys        an array of foreign keys
     * @return array                    the generated relation array
     */
    public function generateRelation(Doctrine_Table $table, array $foreignKeys)
    {
        $local = (count($foreignKeys) > 1) ? array_keys($foreignKeys) : key($foreignKeys);
        
        $relation = array($table->getComponentName() => 
                        array('local'    => $local,
                              'foreign'  => $table->getIdentifier(),
                              'onDelete' => 'CASCADE',
                              'onUpdate' => 'CASCADE'));

        return $relation;
    }
    /**
     * generates the class definition for plugin class
     *
     * @param array $options    plugin class options, keys representing the option names 
     *                          and values as option values
     * @param array $columns    the plugin class columns, keys representing the column names
     *                          and values as column definitions
     * @param array $relations  the bound relations of the plugin class
     * @return void
     */
    public function generateClass($options, $columns, $relations)
    {
        $builder = new Doctrine_Import_Builder();

        if ($this->_options['generateFiles']) {
            if (isset($this->_options['generatePath']) && $this->_options['generatePath']) {
                $builder->setTargetPath($this->_options['generatePath']);
            
                $builder->buildRecord($options, $columns, $relations);
            } else {
                throw new Doctrine_Plugin_Exception('If you wish to generate files then you must specify the path to generate the files in.');
            }
        } else {
            $def = $builder->buildDefinition($options, $columns, $relations);
          
            eval($def);
        }
    }
}