<?php

namespace KTH\HTMLGenerator;

use League\CommonMark\Environment\Environment;
use League\CommonMark\Extension\CommonMark\CommonMarkCoreExtension;
use League\CommonMark\Extension\HeadingPermalink\HeadingPermalinkExtension;
use League\CommonMark\Extension\TableOfContents\TableOfContentsExtension;
use League\CommonMark\MarkdownConverter;

class HTMLGenerator {

    private $favicons;
    private $screenshots;


    /**
     * Constructs a new HTMLGenerator object.
     *
     * @param array $services An array of service configurations.
     */
    public function __construct(array $services) {
        foreach ($services as $service) {
            if (!empty($service['favicon'])) {
                $favicons[] = $service['favicon'];
            }
            if (!empty($service['screenshot'])) {
                $screenshots[] = $service['screenshot'];
            }
        }

        $this->favicons = array_unique($favicons, SORT_LOCALE_STRING);
        $this->screenshots = array_unique($screenshots, SORT_LOCALE_STRING);
        if (isset($_SESSION['reimport'])) {
            $this->resizeImg();
            unset($_SESSION['reimport']);
        }
        $this->copyUserFile();
    }

    /**
     * Resizes the favicons and screenshots.
     *
     * @return void
     */
    private function resizeImg(): void {
        $image = new \Zebra_Image();
        foreach ($this->favicons as $favicon) {
            if (!str_starts_with(strtolower($favicon), 'http')) {
                if (is_file('../data/imgs/favicons/' . $favicon)) {
                    $image->source_path = '../data/imgs/favicons/' . $favicon;
                    $image->target_path = '../public/imgs/favicons/' . $favicon . '.webp';
                    $image->preserve_aspect_ratio = true;
                    $image->enlarge_smaller_images = false;
                    $image->resize(32, 32);

                    $image->target_path = '../public/imgs/big_favicons/' . $favicon . '.webp';
                    $image->resize(128, 128);
                }
            }
        }

        foreach ($this->screenshots as $screenshot) {
            if (!str_starts_with(strtolower($screenshot), 'http')) {
                if (is_file('../data/imgs/screenshots/' . $favicon)) {
                    $image->source_path = '../data/imgs/screenshots/' . $screenshot;
                    $image->target_path = '../public/imgs/screenshots/' . $screenshot . '.webp';
                    $image->preserve_aspect_ratio = true;
                    $image->enlarge_smaller_images = false;
                    $image->resize(1120);

                    $image->target_path = '../public/imgs/thumbs/' . $screenshot . '.webp';
                    $image->resize(250);
                }
            }
        }
    }

    /**
     * Copy user-provided CSS, JS, and SVG files to the public directory.
     *
     * @return void
     */
    private function copyUserFile(): void {
        if (file_exists('../data/assets/css/user.css')) {
            copy('../data/assets/css/user.css', '../public/assets/css/user.css');
        }

        if (file_exists('../data/assets/js/user.js')) {
            copy('../data/assets/js/user.js', '../public/assets/js/user.js');
        }

        foreach (glob("../data/assets/icons/*.svg") as $filePath) {
            $filename = pathinfo($filePath, PATHINFO_BASENAME);
            copy($filePath, $filename);
        }
    }

    /**
     * Generate the user documentation in HTML format.
     *
     * @return string | null The HTML content of the user documentation.
     */
    public function genUserDoc(): string | null {
        if (file_exists('../data/help.md')) {
            $configMD = [
                'table_of_contents' => [
                    'html_class' => 'table-of-contents',
                    'position' => 'top',
                    'style' => 'bullet',
                    'min_heading_level' => 1,
                    'max_heading_level' => 6,
                    'normalize' => 'relative',
                    'placeholder' => null,
                ],
                'heading_permalink' => [
                    'html_class' => 'heading-permalink',
                    'id_prefix' => 'content',
                    'apply_id_to_heading' => false,
                    'heading_class' => '',
                    'fragment_prefix' => 'content',
                    'insert' => 'before',
                    'min_heading_level' => 1,
                    'max_heading_level' => 6,
                    'title' => 'Permalink',
                    'symbol' => '',
                    'aria_hidden' => true,
                ],
            ];

            $environment = new Environment($configMD);
            $environment->addExtension(new CommonMarkCoreExtension());
            $environment->addExtension(new HeadingPermalinkExtension());
            $environment->addExtension(new TableOfContentsExtension());
            $converter = new MarkdownConverter($environment);

            return $converter->convert(file_get_contents('../data/help.md'))->getContent();
        } else {
            return null;
        }
    }
}