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<?php
class pluginRedirectPages extends Plugin
{
    public function init()
    {
        // Standardwerte
        $this->dbFields = [
            'force-https'    => false,
            'https-status'   => 301,
            'allow-external' => false,
            'redirects'      => '' // JSON-String
        ];
    }

    /* ===============================
       FRONTEND REDIRECT
       =============================== */
    public function beforeAll()
    {
        global $url;

        $redirectsJson = $this->getValue('redirects');
        $redirects = json_decode($redirectsJson, true);

        if (!is_array($redirects)) {
            return; // keine Redirects
        }

        $slug = trim($url->slug(), '/');
        if (!isset($redirects[$slug])) {
            return; // kein Redirect für diese Seite
        }

        $rule = $redirects[$slug];

        // Ziel-URL formen
        $target = $this->formRedirectUrl($rule['to'] ?? '', (bool)$this->getValue('allow-external'));

        if (!$target) {
            return; // ungültiges Ziel
        }

        $status = ((int)($rule['status'] ?? $this->getValue('https-status')) === 301) ? 301 : 302;

        // Optional HTTPS erzwingen
        if ($this->getValue('force-https') && strpos($target, 'http://') === 0) {
            $target = 'https://' . substr($target, 7);
        }

        if (!empty($_GET)) {
            $target .= '?' . http_build_query($_GET);
        }

        header("Location: $target", true, $status);
        exit;
    }

    private function formRedirectUrl(string $to, bool $allowExternal): ?string
    {
        $to = trim($to);
        if ($to === '') {
            return null;
        }

        if ($allowExternal && (strpos($to, 'http://') === 0 || strpos($to, 'https://') === 0)) {
            return $to;
        }

        return rtrim(DOMAIN_BASE, '/') . '/' . ltrim($to, '/');
    }

    /* ===============================
       ADMIN FORM
       =============================== */
    public function form()
    {
        $redirects = $this->getValue('redirects');
        if (!is_string($redirects)) {
            $redirects = '';
        }

        ?>
        <h3>Redirect Settings</h3>

        <div class="form-group">
            <label>
                <input type="hidden" name="force-https" value="false">
                <input type="checkbox" name="force-https" value="true"
                    <?php echo $this->getValue('force-https') ? 'checked' : ''; ?>>
                Force HTTPS Everywhere
            </label>
        </div>

        <div class="form-group">
            <label>Default Redirect Status</label>
            <select name="https-status" class="form-control">
                <option value="301" <?php echo $this->getValue('https-status') == 301 ? 'selected' : ''; ?>>301 - Moved Permanently</option>
                <option value="302" <?php echo $this->getValue('https-status') == 302 ? 'selected' : ''; ?>>302 - Moved Temporarily</option>
            </select>
        </div>

        <div class="form-group">
            <label>
                <input type="hidden" name="allow-external" value="false">
                <input type="checkbox" name="allow-external" value="true"
                    <?php echo $this->getValue('allow-external') ? 'checked' : ''; ?>>
                Allow External Redirects
            </label>
        </div>

        <hr>

        <h3>Redirect Rules (JSON)</h3>
        <p>Format:</p>
        <pre>{
    "old-slug": {"to":"new-slug-or-URL","status":301}
}</pre>
        <textarea name="redirects" rows="12" class="form-control"><?php echo htmlspecialchars($redirects); ?></textarea>
        <?php
    }

    /* ===============================
       SAVE POST DATA
       =============================== */
    public function post()
    {
        $this->db['force-https']    = ($_POST['force-https'] ?? 'false') === 'true';
        $this->db['https-status']   = (int)($_POST['https-status'] ?? 301);
        $this->db['allow-external'] = ($_POST['allow-external'] ?? 'false') === 'true';

        $json = $_POST['redirects'] ?? '';
        $decoded = json_decode($json, true);

        if (!is_array($decoded)) {
            return false; // ungültiges JSON
        }

        $this->db['redirects'] = json_encode($decoded, JSON_UNESCAPED_SLASHES);
        return $this->save();
    }

    /* ===============================
       ADMIN SIDEBAR
       =============================== */
    public function adminSidebar()
    {
        return '<a class="nav-link" href="' . HTML_PATH_ADMIN_ROOT . 'configure-plugin/pluginRedirectPages">Redirects</a>';
    }
}