part of '../space_admin_dialog.dart';

class _PermissionsTab extends ConsumerStatefulWidget {
  final Room space;
  const _PermissionsTab({required this.space});

  @override
  ConsumerState<_PermissionsTab> createState() => _PermissionsTabState();
}

class _PermissionsTabState extends ConsumerState<_PermissionsTab> {
  bool _saving = false;
  String? _status;

  // Current power level values (loaded from room state)
  late Map<String, int> _levels;

  static const _defaults = {
    'events_default': 0,
    'state_default': 50,
    'invite': 0,
    'kick': 50,
    'ban': 50,
    'redact': 50,
  };

  static const _labels = {
    'events_default': 'Nachrichten senden',
    'state_default': 'Raum-Einstellungen ändern',
    'invite': 'Mitglieder einladen',
    'kick': 'Mitglieder kicken',
    'ban': 'Mitglieder bannen',
    'redact': 'Nachrichten löschen',
  };

  @override
  void initState() {
    super.initState();
    _load();
  }

  void _load() {
    final content = widget.space
            .getState(EventTypes.RoomPowerLevels)
            ?.content ??
        {};
    _levels = {
      for (final key in _defaults.keys)
        key: (content[key] as int?) ?? _defaults[key]!,
    };
  }

  Future<void> _save() async {
    setState(() { _saving = true; _status = null; });
    try {
      // Server-Stand holen und nur die geänderten Schlüssel mergen — der
      // lokale Cache kann unvollständig sein und würde users/events wipen.
      await updatePowerLevelsSafely(widget.space, (content) {
        for (final entry in _levels.entries) {
          content[entry.key] = entry.value;
        }
      });
      setState(() => _status = 'Gespeichert');
    } catch (e) {
      final msg = e is MatrixException
          ? '${e.errcode}: ${e.errorMessage}'
          : e.toString().split('\n').first;
      setState(() => _status = 'Fehler: $msg');
    } finally {
      setState(() => _saving = false);
    }
  }

  @override
  Widget build(BuildContext context) {
    final pt = PyramidTheme.of(context);
    final ownPower = widget.space.ownPowerLevel;
    final canEdit = ownPower >= _kPowerAdmin;

    return SingleChildScrollView(
      padding: const EdgeInsets.all(20),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Text('Mindestberechtigungen',
              style: TextStyle(
                  color: pt.fgDim,
                  fontSize: 11,
                  fontWeight: FontWeight.w700,
                  letterSpacing: 0.8)),
          const SizedBox(height: 4),
          Text(
              'Lege fest, welche Stufe ein Mitglied mindestens haben muss, um diese Aktion auszuführen.',
              style: TextStyle(color: pt.fgDim, fontSize: 12)),
          const SizedBox(height: 16),
          ...(_labels.entries.map((e) => _PermissionRow(
                label: e.value,
                value: _levels[e.key]!,
                enabled: canEdit,
                pt: pt,
                onChanged: (v) => setState(() => _levels[e.key] = v),
              ))),
          if (canEdit) ...[
            const SizedBox(height: 20),
            if (_status != null)
              Padding(
                padding: const EdgeInsets.only(bottom: 8),
                child: Text(_status!,
                    style: TextStyle(
                        color: _status!.startsWith('F')
                            ? const Color(0xFFED4245)
                            : const Color(0xFF57F287),
                        fontSize: 12)),
              ),
            SizedBox(
              width: double.infinity,
              child: FilledButton(
                onPressed: _saving ? null : _save,
                style: FilledButton.styleFrom(
                  backgroundColor: pt.accent,
                  shape: RoundedRectangleBorder(
                      borderRadius: BorderRadius.circular(pt.rBase)),
                ),
                child: _saving
                    ? SizedBox(
                        width: 18,
                        height: 18,
                        child: CircularProgressIndicator(
                            strokeWidth: 2, color: pt.bg0))
                    : const Text('Speichern',
                        style: TextStyle(
                            color: Colors.white,
                            fontWeight: FontWeight.w600)),
              ),
            ),
          ],
        ],
      ),
    );
  }
}

class _PermissionRow extends StatelessWidget {
  final String label;
  final int value;
  final bool enabled;
  final PyramidTheme pt;
  final ValueChanged<int> onChanged;

  const _PermissionRow({
    required this.label,
    required this.value,
    required this.enabled,
    required this.pt,
    required this.onChanged,
  });

  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: const EdgeInsets.only(bottom: 12),
      child: Row(
        children: [
          Expanded(
            child: Text(label,
                style: TextStyle(
                    color: pt.fg,
                    fontSize: 13,
                    fontWeight: FontWeight.w500)),
          ),
          if (enabled)
            DropdownButton<int>(
              value: value,
              dropdownColor: pt.bg2,
              underline: const SizedBox.shrink(),
              style: TextStyle(color: pt.fg, fontSize: 13),
              items: const [
                DropdownMenuItem(value: 0, child: Text('Mitglied (0)')),
                DropdownMenuItem(value: 50, child: Text('Moderator (50)')),
                DropdownMenuItem(value: 100, child: Text('Admin (100)')),
              ],
              onChanged: (v) => v != null ? onChanged(v) : null,
            )
          else
            Container(
              padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 4),
              decoration: BoxDecoration(
                color: _powerColor(value, pt).withAlpha(30),
                borderRadius: BorderRadius.circular(6),
              ),
              child: Text(_powerLabel(value),
                  style: TextStyle(
                      color: _powerColor(value, pt),
                      fontSize: 12,
                      fontWeight: FontWeight.w600)),
            ),
        ],
      ),
    );
  }
}