<?php namespace CodeIgniter\Validation;

/**
 * CodeIgniter
 *
 * An open source application development framework for PHP
 *
 * This content is released under the MIT License (MIT)
 *
 * Copyright (c) 2014 - 2017, British Columbia Institute of Technology
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * @package	CodeIgniter
 * @author	CodeIgniter Dev Team
 * @copyright	Copyright (c) 2014 - 2017, British Columbia Institute of Technology (http://bcit.ca/)
 * @license	https://opensource.org/licenses/MIT	MIT License
 * @link	https://codeigniter.com
 * @since	Version 3.0.0
 * @filesource
 */

use CodeIgniter\HTTP\RequestInterface;
use Config\Services;

class FileRules
{
    /**
     * Request instance. So we can get access to the files.
     *
     * @var \CodeIgniter\HTTP\RequestInterface
     */
    protected $request;

    //--------------------------------------------------------------------

    public function __construct(RequestInterface $request = null)
    {
        if (is_null($request))
        {
            $request = Services::request();
        }

        $this->request = $request;
    }

    //--------------------------------------------------------------------

    /**
     * Verifies that $name is the name of a valid uploaded file.
     *
     * @param string $name
     *
     * @return bool
     */
    public function uploaded(string $blank = null, string $name, array $data): bool
    {
        $file = $this->request->getFile($name);

        if (is_null($file))
        {
            return false;
        }

        if (ENVIRONMENT == 'testing')
        {
            return $file->getError() === 0;
        }

        return $file->isValid();
    }

    //--------------------------------------------------------------------

    /**
     * Verifies if the file's size in Kilobytes is larger than the parameter.
     *
     * @param string|null $blank
     * @param string      $params
     * @param array       $data
     *
     * @return bool
     */
    public function max_size(string $blank = null, string $params, array $data): bool
    {
        // Grab the file name off the top of the $params
        // after we split it.
        $params = explode(',', $params);
        $name  = array_shift($params);

        $file = $this->request->getFile($name);

        if (is_null($file))
        {
            return false;
        }

        return $params[0] > $file->getSize('kb');
    }

    //--------------------------------------------------------------------

    /**
     * Uses the mime config file to determine if a file is considered an "image",
     * which for our purposes basically means that it's a raster image or svg.
     *
     * @param string|null $blank
     * @param string      $params
     * @param array       $data
     *
     * @return bool
     */
    public function is_image(string $blank = null, string $params, array $data): bool
    {
        // Grab the file name off the top of the $params
        // after we split it.
        $params = explode(',', $params);
        $name  = array_shift($params);

        $file = $this->request->getFile($name);

        if (is_null($file))
        {
            return false;
        }

        // We know that our mimes list always has the first mime
        // start with `image` even when then are multiple accepted types.
        $type = \Config\Mimes::guessTypeFromExtension($file->getExtension());

        return mb_strpos($type, 'image') === 0;
    }

    //--------------------------------------------------------------------

    /**
     * Checks to see if an uploaded file's mime type matches one in the parameter.
     *
     * @param string|null $blank
     * @param string      $params
     * @param array       $data
     *
     * @return bool
     */
    public function mime_in(string $blank = null, string $params, array $data): bool
    {
        // Grab the file name off the top of the $params
        // after we split it.
        $params = explode(',', $params);
        $name  = array_shift($params);

        $file = $this->request->getFile($name);

        if (is_null($file))
        {
            return false;
        }

        return in_array($file->getType(), $params);
    }

    //--------------------------------------------------------------------

    /**
     * Checks to see if an uploaded file's extension matches one in the parameter.
     *
     * @param string|null $blank
     * @param string      $params
     * @param array       $data
     *
     * @return bool
     */
    public function ext_in(string $blank = null, string $params, array $data): bool
    {
        // Grab the file name off the top of the $params
        // after we split it.
        $params = explode(',', $params);
        $name  = array_shift($params);

        $file = $this->request->getFile($name);

        if (is_null($file))
        {
            return false;
        }

        return in_array($file->getExtension(), $params);
    }

    //--------------------------------------------------------------------

    /**
     * Checks an uploaded file to verify that the dimensions are within
     * a specified allowable dimension.
     *
     * @param string|null $blank
     * @param string      $params
     * @param array       $data
     *
     * @return bool
     */
    public function max_dims(string $blank = null, string $params, array $data): bool
    {
        // Grab the file name off the top of the $params
        // after we split it.
        $params = explode(',', $params);
        $name  = array_shift($params);

        $file = $this->request->getFile($name);

        if (is_null($file))
        {
            return false;
        }

        // Get Parameter sizes
        $allowedWidth  = $params[0] ?? 0;
        $allowedHeight = $params[1] ?? 0;

        // Get uploaded image size
        $info = getimagesize($file->getTempName());
        $fileWidth = $info[0];
        $fileHeight = $info[1];

        return $fileWidth <= $allowedWidth && $fileHeight <= $allowedHeight;
    }

    //--------------------------------------------------------------------

}
