<?php

/**
 * E2pdf Convert Helper
 * 
 * @copyright  Copyright 2017 https://e2pdf.com
 * @license    GPL v2
 * @version    1
 * @link       https://e2pdf.com
 * @since      1.01.02
 */
if (!defined('ABSPATH')) {
    die('Access denied.');
}

class Helper_E2pdf_Convert {

    private $helper;

    public function __construct() {
        $this->helper = Helper_E2pdf_Helper::instance();
    }

    public function to_hex_color($hex = '') {
        $color = array(
            0x00, 0x00, 0x00
        );
        $hex = ltrim($hex, '#');
        if (strlen($hex) === 3) {
            $color = array(
                hexdec(substr($hex, 0, 1)),
                hexdec(substr($hex, 1, 1)),
                hexdec(substr($hex, 2, 1))
            );
        } elseif (strlen($hex) === 6) {
            $color = array(
                hexdec(substr($hex, 0, 2)),
                hexdec(substr($hex, 2, 2)),
                hexdec(substr($hex, 4, 2))
            );
        }
        return $color;
    }

    /**
     * Convert from bytes to Human View
     * 
     * @param int $size - Size in Bytes
     * 
     * @return string - Converted size
     */
    public function from_bytes($size) {
        $unit = array('B', 'KB', 'MB', 'GB', 'TB', 'PB');
        return @round($size / pow(1024, ($i = floor(log($size, 1024)))), 2) . '' . $unit[$i];
    }

    public function to_bytes($size) {
        $unit = preg_replace('/[^bkmgtpezy]/i', '', $size);
        $size = preg_replace('/[^0-9\.]/', '', $size);
        if ($unit) {
            return round($size * pow(1024, stripos('bkmgtpezy', $unit[0])));
        } else {
            return round($size);
        }
    }

    public function to_file_name($file_name = '') {
        if ($file_name) {
            $search = array(
                '/',
                '\\',
                '"',
                '&#91;',
                '&#93;',
                '&#39;',
                '&#34;',
                '&#91;',
                '&#93;',
                '&amp;',
                ';',
            );
            $replace = array(
                '',
                '_',
                '',
                '[',
                ']',
                '\'',
                '',
                '[',
                ']',
                '&',
                ''
            );

            $file_name = str_replace($search, $replace, $file_name);
        }

        return $file_name;
    }

    /*
      stritr - case insensitive version of strtr
      Author: Alexander Peev
      Posted in PHP.NET
     */

    public function stritr($haystack, $needle) {
        if (is_array($needle)) {
            $pos1 = 0;
            $result = $haystack;
            while (count($needle) > 0) {
                $positions = array();
                foreach ($needle as $from => $to) {
                    if (( $pos2 = stripos($result, $from, $pos1) ) === FALSE) {
                        unset($needle[$from]);
                    } else {
                        $positions[$from] = $pos2;
                    }
                }
                if (count($needle) <= 0) {
                    break;
                }

                $winner = min($positions);
                $key = array_search($winner, $positions);
                $result = ( substr($result, 0, $winner) . $needle[$key] . substr($result, ( $winner + strlen($key))) );
                $pos1 = ( $winner + strlen($needle[$key]) );
            }
            return $result;
        } else {
            return $haystack;
        }
    }

    public function to_shortcode_array($value, $fields = array()) {
        $list = explode(',', $value);
        $data = array();
        foreach ($list as $item) {
            $data[] = $this->parse_fields($item);
        }
        return $data;
    }

    public function path_to_url($path = '') {
        $url = str_replace(
                wp_normalize_path(untrailingslashit(ABSPATH)), site_url(), wp_normalize_path($path)
        );
        return esc_url_raw($url);
    }

    public function preg_replace($pattern = '', $replacement = '', $value = '') {
        if ($pattern && $value) {
            return preg_replace($pattern, $replacement, $value);
        }
        return $value;
    }

    public function to_content_key($content_key = false, $value = '') {
        $response = '';

        if ($content_key) {
            $shortcode_tags = array(
                'e2pdf-content'
            );
            preg_match_all('@\[([^<>&/\[\]\x00-\x20=]++)@', $value, $matches);
            $tagnames = array_intersect($shortcode_tags, $matches[1]);

            if (!empty($tagnames)) {

                $pattern = $this->helper->load('shortcode')->get_shortcode_regex($tagnames);

                preg_match_all("/$pattern/", $value, $shortcodes);

                foreach ($shortcodes[0] as $key => $shortcode_value) {
                    $shortcode = array();
                    $shortcode[1] = $shortcodes[1][$key];
                    $shortcode[2] = $shortcodes[2][$key];
                    $shortcode[3] = $shortcodes[3][$key];
                    $shortcode[4] = $shortcodes[4][$key];
                    $shortcode[5] = $shortcodes[5][$key];
                    $shortcode[6] = $shortcodes[6][$key];

                    $atts = shortcode_parse_atts($shortcode[3]);
                    if (isset($atts['key']) && $atts['key'] == $content_key) {
                        $response = $shortcode[5];
                    }
                }
            }
        }

        return $response;
    }

    private function parse_fields($value) {
        $data = array();
        $fields = explode("|", $value);
        foreach ($fields as $field) {
            $field_data = explode(":", $field);
            $field_key = $field_data['0'];
            unset($field_data['0']);
            $field_value = implode(":", $field_data);
            $data = array_merge_recursive($data, $this->parse_field($field_key, $field_value));
        }
        return $data;
    }

    private function parse_field($field_key, $field_value) {
        $keys = array_reverse(explode('_', $field_key));
        foreach ($keys as $key) {
            $field_value = [$key => $field_value];
        }
        return $field_value;
    }

}