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<?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\Form;

use Symfony\Component\Form\Guess\Guess;
use Symfony\Component\Form\Exception\UnexpectedTypeException;

class FormTypeGuesserChain implements FormTypeGuesserInterface
{
    private $guessers = array();

    /**
* Constructor.
*
* @param array $guessers Guessers as instances of FormTypeGuesserInterface
*
* @throws UnexpectedTypeException if any guesser does not implement FormTypeGuesserInterface
*/
    public function __construct(array $guessers)
    {
        foreach ($guessers as $guesser) {
            if (!$guesser instanceof FormTypeGuesserInterface) {
                throw new UnexpectedTypeException($guesser, 'Symfony\Component\Form\FormTypeGuesserInterface');
            }

            if ($guesser instanceof self) {
                $this->guessers = array_merge($this->guessers, $guesser->guessers);
            } else {
                $this->guessers[] = $guesser;
            }
        }
    }

    public function guessType($class, $property)
    {
        return $this->guess(function ($guesser) use ($class, $property) {
            return $guesser->guessType($class, $property);
        });
    }

    public function guessRequired($class, $property)
    {
        return $this->guess(function ($guesser) use ($class, $property) {
            return $guesser->guessRequired($class, $property);
        });
    }

    public function guessMaxLength($class, $property)
    {
        return $this->guess(function ($guesser) use ($class, $property) {
            return $guesser->guessMaxLength($class, $property);
        });
    }

    public function guessMinLength($class, $property)
    {
        return $this->guess(function ($guesser) use ($class, $property) {
            return $guesser->guessMinLength($class, $property);
        });
    }

    /**
* Executes a closure for each guesser and returns the best guess from the
* return values
*
* @param \Closure $closure The closure to execute. Accepts a guesser
* as argument and should return a Guess instance
*
* @return FieldFactoryGuess The guess with the highest confidence
*/
    private function guess(\Closure $closure)
    {
        $guesses = array();

        foreach ($this->guessers as $guesser) {
            if ($guess = $closure($guesser)) {
                $guesses[] = $guess;
            }
        }

        return Guess::getBestGuess($guesses);
    }
}
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