<?php

/*

 * This file is part of the Symfony package.

 *

 * (c) Fabien Potencier <fabien@symfony.com>

 *

 * For the full copyright and license information, please view the LICENSE

 * file that was distributed with this source code.

 */

namespace Symfony\Component\Config\Definition\Builder;

use Symfony\Component\Config\Definition\Exception\UnsetKeyException;

/**

 * This class builds an if expression.

 *

 * @author Johannes M. Schmitt <schmittjoh@gmail.com>

 * @author Christophe Coevoet <stof@notk.org>

 */

class ExprBuilder

{

    protected $node;

    public $ifPart;

    public $thenPart;

    /**

     * Constructor

     *

     * @param NodeDefinition $node The related node

     */

    public function __construct(NodeDefinition $node)

    {

        $this->node = $node;

    }

    /**

     * Mark the expression as being always used.

     *

     * @return ExprBuilder

     */

    public function always(\Closure $then = null)

    {

        $this->ifPart = function($v) { return true; };

        if (null !== $then) {

            $this->thenPart = $then;

        }

        return $this;

    }

    /**

     * Sets a closure to use as tests.

     *

     * The default one tests if the value is true.

     *

     * @param \Closure $closure

     * @return ExprBuilder

     */

    public function ifTrue(\Closure $closure = null)

    {

        if (null === $closure) {

            $closure = function($v) { return true === $v; };

        }

        $this->ifPart = $closure;

        return $this;

    }

    /**

     * Tests if the value is a string.

     *

     * @return ExprBuilder

     */

    public function ifString()

    {

        $this->ifPart = function($v) { return is_string($v); };

        return $this;

    }

    /**

     * Tests if the value is null.

     *

     * @return ExprBuilder

     */

    public function ifNull()

    {

        $this->ifPart = function($v) { return null === $v; };

        return $this;

    }

    /**

     * Tests if the value is an array.

     *

     * @return ExprBuilder

     */

    public function ifArray()

    {

        $this->ifPart = function($v) { return is_array($v); };

        return $this;

    }

    /**

     * Tests if the value is in an array.

     *

     * @param array $array

     *

     * @return ExprBuilder

     */

    public function ifInArray(array $array)

    {

        $this->ifPart = function($v) use ($array) { return in_array($v, $array, true); };

        return $this;

    }

    /**

     * Tests if the value is not in an array.

     *

     * @param array $array

     *

     * @return ExprBuilder

     */

    public function ifNotInArray(array $array)

    {

        $this->ifPart = function($v) use ($array) { return !in_array($v, $array, true); };

        return $this;

    }

    /**

     * Sets the closure to run if the test pass.

     *

     * @param \Closure $closure

     *

     * @return ExprBuilder

     */

    public function then(\Closure $closure)

    {

        $this->thenPart = $closure;

        return $this;

    }

    /**

     * Sets a closure returning an empty array.

     *

     * @return ExprBuilder

     */

    public function thenEmptyArray()

    {

        $this->thenPart = function($v) { return array(); };

        return $this;

    }

    /**

     * Sets a closure marking the value as invalid at validation time.

     *

     * if you want to add the value of the node in your message just use a %s placeholder.

     *

     * @param string $message

     *

     * @return ExprBuilder

     */

    public function thenInvalid($message)

    {

        $this->thenPart = function ($v) use ($message) {throw new \InvalidArgumentException(sprintf($message, json_encode($v))); };

        return $this;

    }

    /**

     * Sets a closure unsetting this key of the array at validation time.

     *

     * @return ExprBuilder

     */

    public function thenUnset()

    {

        $this->thenPart = function ($v) { throw new UnsetKeyException('Unsetting key'); };

        return $this;

    }

    /**

     * Returns the related node

     *

     * @return NodeDefinition

     */

    public function end()

    {

        if (null === $this->ifPart) {

            throw new \RuntimeException('You must specify an if part.');

        }

        if (null === $this->thenPart) {

            throw new \RuntimeException('You must specify a then part.');

        }

        return $this->node;

    }

    /**

     * Builds the expressions.

     *

     * @param array $expressions An array of ExprBuilder instances to build

     *

     * @return array

     */

    static public function buildExpressions(array $expressions)

    {

        foreach ($expressions as $k => $expr) {

            if ($expr instanceof ExprBuilder) {

                $expressions[$k] = function($v) use($expr) {

                    return call_user_func($expr->ifPart, $v) ? call_user_func($expr->thenPart, $v) : $v;

                };

            }

        }

        return $expressions;

    }

}