<?php

namespace Symfony\Components\Validator\Constraints;

use Symfony\Components\Validator\Constraint;
use Symfony\Components\Validator\ConstraintValidator;
use Symfony\Components\Validator\Exception\ConstraintDefinitionException;
use Symfony\Components\Validator\Exception\UnexpectedTypeException;
use Symfony\Components\File\File;

class FileValidator extends ConstraintValidator
{
  public function isValid($value, Constraint $constraint)
  {
    if ($value === null)
    {
      return true;
    }

    if (!is_scalar($value) && !$value instanceof File && !(is_object($value) && method_exists($value, '__toString()')))
    {
      throw new UnexpectedTypeException($value, 'string');
    }

    $path = $value instanceof File ? $value->getPath() : (string)$value;

    if (!file_exists($path))
    {
      $this->setMessage($constraint->notFoundMessage, array('file' => $path));

      return false;
    }

    if (!is_readable($path))
    {
      $this->setMessage($constraint->notReadableMessage, array('file' => $path));

      return false;
    }

    if ($constraint->maxSize)
    {
      if (ctype_digit((string)$constraint->maxSize))
      {
        $size = filesize($path);
        $limit = $constraint->maxSize;
        $suffix = ' bytes';
      }
      else if (preg_match('/^(\d)k$/', $constraint->maxSize, $matches))
      {
        $size = round(filesize($path) / 1000, 2);
        $limit = $matches[1];
        $suffix = ' kB';
      }
      else if (preg_match('/^(\d)M$/', $constraint->maxSize, $matches))
      {
        $size = round(filesize($path) / 1000000, 2);
        $limit = $matches[1];
        $suffix = ' MB';
      }
      else
      {
        throw new ConstraintDefinitionException(sprintf('"%s" is not a valid maximum size', $constraint->maxSize));
      }

      if ($size > $limit)
      {
        $this->setMessage($constraint->maxSizeMessage, array(
          'size' => $size . $suffix,
          'limit' => $limit . $suffix,
          'file' => $path,
        ));

        return false;
      }
    }

    if ($constraint->mimeTypes)
    {
      if (!$value instanceof File)
      {
        throw new ConstraintValidationException();
      }

      if (!in_array($value->getMimeType(), (array)$constraint->mimeTypes))
      {
        $this->setMessage($constraint->mimeTypesMessage, array(
          'type' => '"'.$value->getMimeType().'"',
          'types' => '"'.implode('", "', (array)$constraint->mimeTypes).'"',
          'file' => $path,
        ));

        return false;
      }
    }

    return true;
  }
}