<?php

/**

 * Front controller / router.

 *

 * Any request that is not a real file or directory is rewritten here by

 * .htaccess. We strip BASE_PATH, parse the path, and dispatch.

 */

require_once __DIR__ . '/includes/db.php';

require_once __DIR__ . '/includes/helpers.php';

// ---- Parse the request path -------------------------------------------------

$uri  = parse_url($_SERVER['REQUEST_URI'] ?? '/', PHP_URL_PATH) ?? '/';

$uri  = rawurldecode($uri);

// Strip the base path prefix if present.

$base = BASE_PATH;

if ($base !== '' && strpos($uri, $base) === 0) {

    $uri = substr($uri, strlen($base));

}

$path  = trim($uri, '/');

$parts = $path === '' ? [] : explode('/', $path);

// ---- Dispatch ---------------------------------------------------------------

if (count($parts) === 0) {

    render_home();

    exit;

}

$slug = strtolower($parts[0]);

if (!valid_slug($slug)) {

    render_404();

    exit;

}

// /{slug}/og-{hash}.png — generated social preview card. The hash only busts

// crawler caches; the current card is served whatever hash is asked for.

if (count($parts) === 2 && preg_match('/^og(?:-([a-f0-9]+))?\.png$/', $parts[1], $m)) {

    require __DIR__ . '/includes/og.php';

    render_repo_og($slug, $m[1] ?? '');

    exit;

}

// /{slug}/{blob|tree|raw|archive}/{path}

if (count($parts) >= 2 && in_array($parts[1], ['blob', 'tree', 'raw', 'archive'], true)) {

    $view = $parts[1];

    $path = implode('/', array_slice($parts, 2)); // repo.php sanitises it

    // blob and raw need an actual file path; tree and archive operate on the

    // whole repository and so may have an empty path.

    if ($path === '' && !in_array($view, ['tree', 'archive'], true)) {

        render_404();

        exit;

    }

    require __DIR__ . '/repo.php';

    exit;

}

// /{slug}

if (count($parts) === 1) {

    $view = 'tree';

    $path = '';

    require __DIR__ . '/repo.php';

    exit;

}

render_404();

exit;

// ---- Views ------------------------------------------------------------------

function render_home(): void

{

    $sort = $_GET['sort'] ?? 'newest';

    if (!isset(REPO_SORTS[$sort])) {

        $sort = 'newest';

    }

    $repos = get_repositories($sort);

    $page_title = 'Repositories';

    $og_description = 'Source code and projects by jefftml.';

    require __DIR__ . '/includes/header.php';

    $sort_labels = [

        'newest' => 'Newest first',

        'oldest' => 'Oldest first',

        'name'   => 'Name (A–Z)',

        'slug'   => 'Slug (A–Z)',

    ];

    ?>

    <div class="repo-list-head">

        <h1>Repositories</h1>

        <?php if (!empty($repos)): ?>

            <form method="get" action="<?= e(url('/')) ?>" class="repo-sort">

                <label for="repo-sort">Sort</label>

                <select name="sort" id="repo-sort" onchange="this.form.submit()">

                    <?php foreach ($sort_labels as $key => $label): ?>

                        <option value="<?= e($key) ?>"<?= $key === $sort ? ' selected' : '' ?>><?= e($label) ?></option>

                    <?php endforeach; ?>

                </select>

                <noscript><button type="submit" class="btn-secondary">Apply</button></noscript>

            </form>

        <?php endif; ?>

    </div>

    <?php if (empty($repos)): ?>

        <p class="empty">No repositories yet.</p>

    <?php else: ?>

        <ul class="repo-list">

            <?php foreach ($repos as $r): ?>

                <li class="repo-item">

                    <a class="repo-name" href="<?= e(url('/' . $r['slug'])) ?>"><?= e($r['name']) ?></a>

                    <?php $rLang = repo_language_display($r); ?>

                    <?php if ($rLang !== ''): ?>

                        <span class="badge"><?= e($rLang) ?></span>

                    <?php endif; ?>

                    <?php if (!empty($r['description'])): ?>

                        <p class="repo-desc"><?= e($r['description']) ?></p>

                    <?php endif; ?>

                    <p class="muted">/<?= e($r['slug']) ?> &middot; created <?= e(substr($r['created_at'], 0, 10)) ?></p>

                </li>

            <?php endforeach; ?>

        </ul>

    <?php endif; ?>

    <?php

    require __DIR__ . '/includes/footer.php';

}

function render_404(): void

{

    http_response_code(404);

    $page_title = 'Not found';

    require __DIR__ . '/includes/header.php';

    echo '<h1>404</h1><p class="empty">Nothing here.</p>';

    require __DIR__ . '/includes/footer.php';

}