// Version: 1.0.0 | Created: 2026-07-04
// Panic button settings — choose the alert room and message.
// Opened from Profile > Emergency panic button.

import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:matrix/matrix.dart';

import '../../../core/network/matrix_client.dart';
import '../data/panic_repository.dart';

Future<void> showPanicSettingsDialog(BuildContext context, WidgetRef ref) {
  return showDialog<void>(
    context: context,
    builder: (_) => const _PanicSettingsDialog(),
  );
}

class _PanicSettingsDialog extends ConsumerStatefulWidget {
  const _PanicSettingsDialog();

  @override
  ConsumerState<_PanicSettingsDialog> createState() =>
      _PanicSettingsDialogState();
}

class _PanicSettingsDialogState extends ConsumerState<_PanicSettingsDialog> {
  String? _roomId;
  late final TextEditingController _messageController;
  bool _saving = false;

  @override
  void initState() {
    super.initState();
    final cfg = ref.read(panicRepositoryProvider).config;
    _roomId = cfg?.roomId;
    _messageController = TextEditingController(
      text: cfg?.message ??
          'EMERGENCY: I need help. This is an automated alert from M8Chat.',
    );
  }

  @override
  void dispose() {
    _messageController.dispose();
    super.dispose();
  }

  Future<void> _save() async {
    final roomId = _roomId;
    if (roomId == null) return;
    setState(() => _saving = true);
    try {
      await ref.read(panicRepositoryProvider).saveConfig(
            roomId: roomId,
            message: _messageController.text.trim(),
          );
      if (mounted) {
        Navigator.of(context).pop();
        ScaffoldMessenger.of(context).showSnackBar(
          const SnackBar(
            content: Text('Panic button armed. Hold the alert icon '
                'on the rooms screen to trigger it.'),
          ),
        );
      }
    } on Exception catch (e) {
      if (mounted) {
        setState(() => _saving = false);
        ScaffoldMessenger.of(context)
            .showSnackBar(SnackBar(content: Text('Could not save: $e')));
      }
    }
  }

  Future<void> _disable() async {
    setState(() => _saving = true);
    await ref.read(panicRepositoryProvider).clearConfig();
    if (mounted) {
      Navigator.of(context).pop();
      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(content: Text('Panic button disabled.')),
      );
    }
  }

  @override
  Widget build(BuildContext context) {
    final client = ref.watch(matrixClientProvider);
    final rooms = client.rooms
        .where((r) => r.membership == Membership.join)
        .toList()
      ..sort((a, b) => a
          .getLocalizedDisplayname()
          .toLowerCase()
          .compareTo(b.getLocalizedDisplayname().toLowerCase()));
    final hasConfig = ref.read(panicRepositoryProvider).config != null;

    return AlertDialog(
      title: const Text('Emergency panic button'),
      content: SingleChildScrollView(
        child: Column(
          mainAxisSize: MainAxisSize.min,
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            const Text(
              'When you hold the alert icon, M8Chat sends this message '
              'and your current location to the room you choose here.',
            ),
            const SizedBox(height: 16),
            DropdownButtonFormField<String>(
              initialValue:
                  rooms.any((r) => r.id == _roomId) ? _roomId : null,
              isExpanded: true,
              decoration: const InputDecoration(
                labelText: 'Send alert to room',
                border: OutlineInputBorder(),
              ),
              items: [
                for (final room in rooms)
                  DropdownMenuItem(
                    value: room.id,
                    child: Text(
                      room.getLocalizedDisplayname(),
                      overflow: TextOverflow.ellipsis,
                    ),
                  ),
              ],
              onChanged: (v) => setState(() => _roomId = v),
            ),
            const SizedBox(height: 16),
            TextField(
              controller: _messageController,
              maxLines: 3,
              decoration: const InputDecoration(
                labelText: 'Alert message',
                border: OutlineInputBorder(),
              ),
            ),
          ],
        ),
      ),
      actions: [
        if (hasConfig)
          TextButton(
            onPressed: _saving ? null : _disable,
            child: const Text('Disable', style: TextStyle(color: Colors.red)),
          ),
        TextButton(
          onPressed: _saving ? null : () => Navigator.of(context).pop(),
          child: const Text('Cancel'),
        ),
        FilledButton(
          onPressed: _saving || _roomId == null ? null : _save,
          child: _saving
              ? const SizedBox(
                  width: 18,
                  height: 18,
                  child: CircularProgressIndicator(strokeWidth: 2),
                )
              : const Text('Save'),
        ),
      ],
    );
  }
}