<?php

namespace app\components;

use yii;

require_once 'ThumbGenerator/ThumbLib.inc.php';

class ThumbGenerator
{
    const NO_IMAGE_BASIC = 'images/image-not-available.png';
    const NO_IMAGE_TICKET     = 'images/no-image-ticket.png';

    const URL_THUMBNAIL_ALIAS = '@web/thumbnails';
    const URL_FILE_ALIAS      = '@web/userfiles';

    const FS_THUMBNAIL_ALIAS  = '@webroot/thumbnails';
    const FS_FILE_ALIAS       = '@webroot/userfiles';
    const FS_BASE_IMAGE_ALIAS = '@webroot/images';

    const METHOD_INNER       = 'inner';
    const METHOD_CROP_CENTER = 'cropCenter';

    public static $methodAlias = [
        'inner'      => 'ar',
        'cropCenter' => 'cc'
    ];

    public static $aliasCallback = [
        'ar' => 'adaptiveResize',
        'cc' => 'cropFromCenter',
    ];

    // список каталогів з яких дозволено ресайз (включаючи підпапки) (with trailing "/")
    public static $allowedSrcPaths = [
        'userfiles/',
        'images/',
    ];

    public static $allowedExtensions = ['jpg', 'jpeg', 'png', 'bmp', 'gif'];

    public static $thumbParams = ['width' => 50, 'height' => 50, 'method' => self::METHOD_INNER];

    public function resize($srcName, $dstName, $options = array())
    {
        $thumb = \PhpThumbFactory::create($srcName);
        $thumb->resize($options['width'], $options['height']);
        $thumb->save($dstName);
    }

    public function adaptiveResize($srcName, $dstName, $options = array())
    {
        $thumb = \PhpThumbFactory::create($srcName);
        $thumb->adaptiveResize($options['width'], $options['height']);
        $thumb->save($dstName);
    }

    public function cropFromCenter($srcName, $dstName, $options = array())
    {
        $thumb = \PhpThumbFactory::create($srcName);
        $thumb->cropFromCenter($options['width'], $options['height']);
        $thumb->save($dstName);
    }

    public static function getImage($srcName, $width, $height, $method = null)
    {
        $dstFile = self::prepareThumbName($srcName, $width, $height, $method);
        $dstUrl = self::getImageUrl($dstFile);

        $directory = Yii::getAlias(self::FS_FILE_ALIAS) . '/';
        $dstName = $directory . $dstFile;
        if (!file_exists($dstName)) {
            if ($srcName) {
                $srcName = $directory . $srcName;
            }
            if (!file_exists($srcName)) {
                $srcName = Yii::getAlias(self::FS_BASE_IMAGE_ALIAS) . '/' . self::NO_IMAGE_BASIC;
                $dstFile = self::prepareThumbName(self::NO_IMAGE_BASIC, $width, $height, $method);
                $dstUrl = self::getImageUrl($dstFile);
                $dstName = $directory . $dstFile;
            }
            if (!file_exists($dstName)) {
                $thumb = \PhpThumbFactory::create($srcName);
                if ($method == 'inner') {
                    $thumb->adaptiveResize($width, $height);
                } else if ($method == 'cropCenter') {
                    $thumb->cropFromCenter($width, $height);
                } else {
                    $thumb->resize($width, $height);
                }

                $thumb->save($dstName);
            }
        }
        return $dstUrl;
    }

    /**
     * @param string      $filename filename inside "web/userfiles" folder
     * @param int         $width
     * @param int         $height
     * @param null|string $method ("inner"|"cropCenter")
     *
     * @return string
     * @throws \yii\base\InvalidParamException
     */
    public static function prepareThumbName($filename, $width, $height, $method = null)
    {
        if (null == ($filename = self::normalizeName($filename))) {
            $filename = self::NO_IMAGE_BASIC;
        }
        $info = pathinfo($filename);
        $methodAlias = ($method && isset(self::$methodAlias[$method])) ? self::$methodAlias[$method] : '';
        return (empty($info['dirname']) || '.' === $info['dirname'] ? 'userfiles' : $info['dirname'])
            . '/' . $info['filename']
            . '_' . $width . 'x' . $height . $methodAlias
            . (empty($info['extension']) ? '' : '.' . $info['extension']);
    }

    public static function getThumbnailUrl($filename, $width, $height, $method = null)
    {
        $thumbName = self::prepareThumbName($filename, $width, $height, $method);
        return yii::getAlias(static::URL_THUMBNAIL_ALIAS) . '/' . $thumbName;
    }

    public static function getImageUrl($filename)
    {
        if (null == ($filename = self::normalizeName($filename))) {
            $filename = self::NO_IMAGE_BASIC;
        }
        return yii::getAlias('@web') . '/' . $filename;
    }

    /**
     * @param $filename
     *
     * @return null|string
     */
    public static function normalizeName($filename)
    {
        if ($filename) {
            $info = pathinfo($filename);
            if (empty($info['dirname']) || '.' === $info['dirname']) {
                $filename = 'userfiles/' . $filename;
                $info['dirname'] = 'userfiles';
            }
            if (self::getExtAllowed($info['extension']) && self::getPathAllowed($info['dirname'])) {
                return $filename;
            }
        }

        return  null;
    }

    public static function getExtAllowed($ext)
    {
        return in_array($ext, self::$allowedExtensions);
    }

    /**
     * @param string $sourcePath relative file path ("userfiles", "images/", ...)
     * @return bool
     */
    public static function getPathAllowed($sourcePath)
    {
        $sourcePath = ('/' === substr($sourcePath, -1)) ? $sourcePath : $sourcePath . '/';
        foreach (self::$allowedSrcPaths as $allowedPath) {
            if (0 === strpos($sourcePath, $allowedPath)) {
                return true;
            }
        }
        return false;
    }

}