<?php

require_once __DIR__.'/../bootstrap.php';

use App\Classes\BaseHandler;

class OembedHandler extends BaseHandler
{
    public function handleRequest(): void
    {
        $requestUrl = $_GET['url'] ?? null;
        $globals = $this->fetchGlobals();
        $parsed = $requestUrl ? parse_url($requestUrl) : null;
        $relativePath = $parsed['path'] ?? null;

        if (! $requestUrl || $relativePath === '/') {
            $this->sendResponse($this->buildResponse(
                $globals['site_name'],
                $globals['url'],
                $globals['metadata']['open_graph_image'],
                $globals,
                $globals['site_description']
            ));
        }

        if (! $relativePath) {
            $this->sendErrorResponse('Invalid url', 400);
        }

        $relativePath = '/'.ltrim($relativePath ?? '', '/');

        if ($relativePath !== '/' && str_ends_with($relativePath, '/')) {
            $relativePath = rtrim($relativePath, '/');
        }

        $cacheKey = 'oembed:'.md5($relativePath);

        if ($this->cache && $this->cache->exists($cacheKey)) {
            $cachedItem = json_decode($this->cache->get($cacheKey), true);

            $this->sendResponse($this->buildResponse(
                $cachedItem['title'],
                $cachedItem['url'],
                $cachedItem['image_url'],
                $globals,
                $cachedItem['description'] ?? ''
            ));
        }

        $results = $this->fetchFromApi('optimized_oembed', 'url=eq.'.urlencode($relativePath));

        if (! empty($results)) {
            $item = $results[0];

            if ($this->cache) {
                $this->cache->setex($cacheKey, 300, json_encode($item));
            }

            $this->sendResponse($this->buildResponse(
                $item['title'],
                $item['url'],
                $item['image_url'],
                $globals,
                $item['description'] ?? ''
            ));
        }

        $segments = explode('/', trim($relativePath, '/'));

        if (count($segments) === 1 && $segments[0] !== '') {
            $title = ucwords(str_replace('-', ' ', $segments[0])).' • '.$globals['author'];

            $this->sendResponse($this->buildResponse(
                $title,
                $relativePath,
                $globals['metadata']['open_graph_image'],
                $globals
            ));
        }

        $this->sendErrorResponse('No match found', 404);
    }

    private function buildResponse(string $title, string $url, string $imagePath, array $globals, string $description = ''): array
    {
        $safeDescription = truncateText(strip_tags(parseMarkdown($description)), 175);
        $html = '<p><a href="'.htmlspecialchars($url).'">'.htmlspecialchars($title).'</a></p>';

        if ($description) {
            $html .= '<p>'.htmlspecialchars($safeDescription, ENT_QUOTES, 'UTF-8').'</p>';
        }

        return [
            'version' => '1.0',
            'type' => 'link',
            'title' => $title,
            'author_name' => $globals['author'],
            'provider_name' => $globals['site_name'],
            'provider_url' => $globals['url'],
            'thumbnail_url' => $globals['url'].'/og/w800'.$imagePath,
            'html' => $html ?? $globals['site_description'],
            'description' => $safeDescription ?? $globals['site_description'],
        ];
    }

    private function fetchGlobals(): array
    {
        $cacheKey = 'globals_data';

        if ($this->cache && $this->cache->exists($cacheKey)) {
            return json_decode($this->cache->get($cacheKey), true);
        }

        $globals = $this->fetchFromApi('optimized_globals', 'limit=1')[0];

        if ($this->cache) {
            $this->cache->setex($cacheKey, 3600, json_encode($globals));
        }

        return $globals;
    }
}

$handler = new OembedHandler();
$handler->handleRequest();