// Version: 1.0.0 | Created: 2026-07-04
// Panic trigger button for the rooms AppBar. Push-to-talk style:
// HOLD to fire the alert; a plain tap only shows the hint. Only rendered
// when a panic configuration exists in account data.

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

import '../data/panic_repository.dart';

class PanicButton extends ConsumerStatefulWidget {
  const PanicButton({super.key});

  @override
  ConsumerState<PanicButton> createState() => _PanicButtonState();
}

class _PanicButtonState extends ConsumerState<PanicButton> {
  bool _sending = false;

  Future<void> _trigger() async {
    if (_sending) return;
    setState(() => _sending = true);
    final messenger = ScaffoldMessenger.of(context);
    messenger.showSnackBar(
      const SnackBar(content: Text('Sending emergency alert…')),
    );
    final error = await ref.read(panicRepositoryProvider).trigger();
    if (!mounted) return;
    setState(() => _sending = false);
    messenger.hideCurrentSnackBar();
    messenger.showSnackBar(
      SnackBar(
        backgroundColor: error == null ? Colors.green.shade800 : null,
        content: Text(
          error ?? 'Emergency alert sent with your location.',
        ),
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
    // Hide when not configured. Config lives in account data, which is
    // available once sync has run; rebuilds happen with the parent screen.
    final configured = ref.watch(panicRepositoryProvider).config != null;
    if (!configured) return const SizedBox.shrink();

    return GestureDetector(
      onLongPress: _trigger,
      child: IconButton(
        tooltip: 'Hold to send emergency alert',
        icon: _sending
            ? const SizedBox(
                width: 20,
                height: 20,
                child: CircularProgressIndicator(strokeWidth: 2),
              )
            : const Icon(Icons.emergency_share, color: Colors.red),
        onPressed: () {
          ScaffoldMessenger.of(context).showSnackBar(
            const SnackBar(
              content: Text('Hold the button to send the emergency alert.'),
            ),
          );
        },
      ),
    );
  }
}