<?php

use dokuwiki\HTTP\DokuHTTPClient;

if (!class_exists('PlantUmlDiagram')) {
    class PlantUmlDiagram {
        private $markup;
        private $encoded;
        private $basePath;

        public function __construct($markup,$plantUmlUrl) {
            $this->markup = nl2br($markup);
            $this->encoded = $this->encodep($markup);
            $this->basePath = $plantUmlUrl;
        }

        public function getMarkup() {
            return $this->markup;
        }

        /**
         * Get the SVG code
         *
         * @return string
         */
        public function getSVG()
        {
            return (new DokuHTTPClient())->get($this->getSVGDiagramUrl());
        }

        public function getSVGDiagramUrl() {
            return $this->basePath."svg/".$this->encoded;
        }

        public function getPNGDiagramUrl() {
            return $this->basePath."png/".$this->encoded;
        }

        public function getTXTDiagramUrl() {
            return $this->basePath."txt/".$this->encoded;
        }

        private function encodep($text) {
            $compressed = gzdeflate($text, 9);
            return $this->encode64($compressed);
       }

        private function encode6bit($b) {
            if ($b < 10) {
                 return chr(48 + $b);
            }
            $b -= 10;
            if ($b < 26) {
                 return chr(65 + $b);
            }
            $b -= 26;
            if ($b < 26) {
                 return chr(97 + $b);
            }
            $b -= 26;
            if ($b == 0) {
                 return '-';
            }
            if ($b == 1) {
                 return '_';
            }
            return '?';
       }

        private function append3bytes($b1, $b2, $b3) {
            $c1 = $b1 >> 2;
            $c2 = (($b1 & 0x3) << 4) | ($b2 >> 4);
            $c3 = (($b2 & 0xF) << 2) | ($b3 >> 6);
            $c4 = $b3 & 0x3F;
            $r = "";
            $r .= $this->encode6bit($c1 & 0x3F);
            $r .= $this->encode6bit($c2 & 0x3F);
            $r .= $this->encode6bit($c3 & 0x3F);
            $r .= $this->encode6bit($c4 & 0x3F);
            return $r;
       }

        private function encode64($c) {
            $str = "";
            $len = strlen($c);
            for ($i = 0; $i < $len; $i+=3) {
                   if ($i+2==$len) {
                         $str .= $this->append3bytes(ord(substr($c, $i, 1)), ord(substr($c, $i+1, 1)), 0);
                   } else if ($i+1==$len) {
                         $str .= $this->append3bytes(ord(substr($c, $i, 1)), 0, 0);
                   } else {
                         $str .= $this->append3bytes(ord(substr($c, $i, 1)), ord(substr($c, $i+1, 1)),
                             ord(substr($c, $i+2, 1)));
                   }
            }
            return $str;
       }
    }
}

?>