<?php

/**
 * This file is part of the Propel package.
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 *
 * @license    MIT License
 */

/**
 * Proxy for conditional statements in a fluid interface.
 * This class replaces another class for wrong statements,
 * and silently catches all calls to non-conditional method calls
 *
 * @example
 * <code>
 * $c->_if(true)        // returns $c
 *     ->doStuff()      // executed
 *   ->_else()          // returns a PropelConditionalProxy instance
 *     ->doOtherStuff() // not executed
 *   ->_endif();        // returns $c
 * $c->_if(false)       // returns a PropelConditionalProxy instance
 *     ->doStuff()      // not executed
 *   ->_else()          // returns $c
 *     ->doOtherStuff() // executed
 *   ->_endif();        // returns $c
 * @see Criteria
 *
 * @author     Francois Zaninotto
 * @version    $Revision$
 * @package    propel.runtime.util
 */
class PropelConditionalProxy
{
    protected $criteria;
    protected $parent;
    protected $state;
    protected $wasTrue;
    protected $parentState;

    public function __construct($criteria, $cond, $proxy = null)
    {
        $this->criteria = $criteria;
        $this->wasTrue = false;
        $this->setConditionalState($cond);
        $this->parent = $proxy;

        if (is_null($proxy)) {
            $this->parentState = true;
        } else {
            $this->parentState = $proxy->getConditionalState();
        }
    }

    /**
     * Returns a new level PropelConditionalProxy instance.
     * Allows for conditional statements in a fluid interface.
     *
     * @param bool $cond
     *
     * @return PropelConditionalProxy
     */
    public function _if($cond)
    {
        return $this->criteria->_if($cond);
    }

    /**
     * Allows for conditional statements in a fluid interface.
     *
     * @param bool $cond ignored
     *
     * @return PropelConditionalProxy
     */
    public function _elseif($cond)
    {
        return $this->setConditionalState(!$this->wasTrue && $cond);
    }

    /**
     * Allows for conditional statements in a fluid interface.
     *
     * @return PropelConditionalProxy
     */
    public function _else()
    {
        return $this->setConditionalState(!$this->state && !$this->wasTrue);
    }

    /**
     * Returns the parent object
     * Allows for conditional statements in a fluid interface.
     *
     * @return PropelConditionalProxy|Criteria
     */
    public function _endif()
    {
        return $this->criteria->_endif();
    }

    /**
     * return the current conditional status
     *
     * @return boolean
     */
    protected function getConditionalState()
    {
        return $this->state && $this->parentState;
    }

    protected function setConditionalState($cond)
    {
        $this->state = (bool) $cond;
        $this->wasTrue = $this->wasTrue || $this->state;

        return $this->getCriteriaOrProxy();
    }

    public function getParentProxy()
    {
        return $this->parent;
    }

    public function getCriteriaOrProxy()
    {
        if ($this->state && $this->parentState) {
            return $this->criteria;
        }

        return $this;
    }

    public function __call($name, $arguments)
    {
        return $this;
    }
}
