// If your pages are .html, rename them to .php OR configure Apache/Nginx to parse .html as PHP.

function bc_base_url(): string {
    $isHttps = (
        (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off') ||
        (!empty($_SERVER['SERVER_PORT']) && $_SERVER['SERVER_PORT'] == 443) ||
        (isset($_SERVER['HTTP_X_FORWARDED_PROTO']) && $_SERVER['HTTP_X_FORWARDED_PROTO'] === 'https')
    );
    $scheme = $isHttps ? 'https' : 'http';
    $host   = $_SERVER['HTTP_HOST'] ?? 'localhost';

    // If your site is in a subdirectory, set it here (e.g., '/site')
    $subdir = rtrim(dirname($_SERVER['SCRIPT_NAME'] ?? ''), '/\\');
    if ($subdir === '/' || $subdir === '\\' || $subdir === '.') $subdir = '';

    return $scheme.'://'.$host.$subdir;
}

function bc_segments(): array {
    // Strip query/hash, normalize, remove leading subdir if present
    $reqUri = $_SERVER['REQUEST_URI'] ?? '/';
    $parsed = parse_url($reqUri);
    $path   = $parsed['path'] ?? '/';

    // Normalize: remove subdir portion so crumbs start after your base path
    $subdir = rtrim(dirname($_SERVER['SCRIPT_NAME'] ?? ''), '/\\');
    if ($subdir && $subdir !== '.' && $subdir !== '/') {
        // Ensure we only strip an actual prefix match
        if (strpos($path, $subdir.'/') === 0) {
            $path = substr($path, strlen($subdir));
        }
    }

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

    if ($path === '' || $path === 'index.php' || $path === 'index.html') {
        return []; // homepage → no segments
    }

    $raw = array_values(array_filter(explode('/', $path), function ($seg) {
        return $seg !== '';
    }));

    // Remove a trailing index.* if present
    $last = end($raw);
    if ($last && preg_match('~^index\.(php|html|htm)$~i', $last)) {
        array_pop($raw);
    }

    return $raw;
}

function bc_humanize(string $seg): string {
    // Remove extensions, decode, replace separators, title-case lightly
    $seg = preg_replace('~\.(php|html|htm)$~i', '', $seg);
    $seg = urldecode($seg);
    $seg = str_replace(['-', '_'], ' ', $seg);
    $seg = trim($seg);
    // Uppercase first letter of words without mangling acronyms too much
    return preg_replace_callback('/\\b([a-z])/i', function ($m) { return strtoupper($m[1]); }, $seg);
}

function render_breadcrumb(array $title_map = [], bool $hide_on_home = true, string $home_label = 'Home'): void {
    $base   = rtrim(bc_base_url(), '/');
    $segs   = bc_segments();

    if ($hide_on_home && empty($segs)) {
        // On homepage: optionally print nothing. Flip flag to show just "Home" if you want.
        return;
    }

    // Visible breadcrumb
    echo '<nav aria-label="Breadcrumb" class="bc-wrap" style="margin:8px 0;">';
    echo '<ol class="breadcrumb" style="list-style:none; padding:0; margin:0;">';
    echo '<li style="display:inline;"><a href="'.$base.'">'.$home_label.'</a></li>';

    $build = '';
    foreach ($segs as $i => $seg) {
        $build .= '/'.$seg;
        $name = $title_map[$seg] ?? bc_humanize($seg);
        $is_last = ($i === count($segs) - 1);
        echo ' &raquo; ';
        if ($is_last) {
            echo '<li style="display:inline;">'.htmlspecialchars($name, ENT_QUOTES, 'UTF-8').'</li>';
        } else {
            echo '<li style="display:inline;"><a href="'.$base.$build.'">'.htmlspecialchars($name, ENT_QUOTES, 'UTF-8').'</a></li>';
        }
    }
    echo '</ol>';
    echo '</nav>';

    // JSON-LD schema
    $items = [];
    $position = 1;
    $items[] = [
        '@type'    => 'ListItem',
        'position' => $position++,
        'name'     => $home_label,
        'item'     => $base.'/'
    ];

    $build = '';
    foreach ($segs as $seg) {
        $build .= '/'.$seg;
        $name = $title_map[$seg] ?? bc_humanize($seg);
        $items[] = [
            '@type'    => 'ListItem',
            'position' => $position++,
            'name'     => $name,
            'item'     => $base.$build
        ];
    }

    $schema = [
        '@context'        => 'https://schema.org',
        '@type'           => 'BreadcrumbList',
        'itemListElement' => $items
    ];

    echo '<script type="application/ld+json">'.json_encode($schema, JSON_UNESCAPED_SLASHES|JSON_UNESCAPED_UNICODE).'</script>';
}