import 'package:flutter/material.dart';

import '../session/view_state.dart';
import 'app_scope.dart';
import 'dialogs/clear_confirm_dialog.dart';
import 'dialogs/layout_dialog.dart';
import 'dialogs/settings_dialog.dart';

class Toolbar extends StatelessWidget {
  const Toolbar({super.key});

  @override
  Widget build(BuildContext context) {
    final scope = AppScope.of(context);
    return Material(
      color: Theme.of(context).colorScheme.surface,
      child: Padding(
        padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 6),
        child: Row(
          children: [
            const Text(
              'Telemetry Monitor',
              style: TextStyle(fontWeight: FontWeight.w500),
            ),
            const SizedBox(width: 12),
            const _Sep(),
            ListenableBuilder(
              listenable: scope.session.viewState,
              builder: (_, __) => OutlinedButton.icon(
                onPressed: () {
                  final newestUs = scope.session.packets.newest?.timestampUs
                          .toInt() ??
                      DateTime.now().microsecondsSinceEpoch;
                  scope.session.viewState.togglePause(newestUs: newestUs);
                },
                icon: Icon(scope.session.viewState.userPaused
                    ? Icons.play_arrow
                    : Icons.pause),
                label: Text(
                    scope.session.viewState.userPaused ? 'Resume' : 'Pause'),
              ),
            ),
            const SizedBox(width: 6),
            ListenableBuilder(
              listenable: scope.session.viewState,
              builder: (_, __) => OutlinedButton.icon(
                onPressed: scope.session.viewState.anchorMode ==
                        ViewAnchorMode.followLive
                    ? null
                    : scope.session.viewState.goLive,
                icon: const Icon(Icons.fast_forward),
                label: const Text('Go live'),
              ),
            ),
            const SizedBox(width: 6),
            OutlinedButton.icon(
              onPressed: () => scope.session.viewState.resetView(),
              icon: const Icon(Icons.fit_screen),
              label: const Text('Reset view'),
            ),
            const SizedBox(width: 6),
            ValueListenableBuilder<bool>(
              valueListenable: scope.session.cursorEnabled,
              builder: (_, on, __) {
                final scheme = Theme.of(context).colorScheme;
                return OutlinedButton.icon(
                  onPressed: () =>
                      scope.session.cursorEnabled.value = !on,
                  icon: const Icon(Icons.my_location),
                  label: const Text('Cursor'),
                  style: on
                      ? OutlinedButton.styleFrom(
                          backgroundColor: scheme.primaryContainer,
                          foregroundColor: scheme.onPrimaryContainer,
                        )
                      : null,
                );
              },
            ),
            const _Sep(),
            OutlinedButton.icon(
              onPressed: () => showDialog<void>(
                context: context,
                builder: (_) => scope.wrap(const LayoutDialog()),
              ),
              icon: const Icon(Icons.grid_view),
              label: const Text('Layout'),
            ),
            const SizedBox(width: 6),
            OutlinedButton.icon(
              onPressed: () => showDialog<void>(
                context: context,
                builder: (_) => scope.wrap(const SettingsDialog()),
              ),
              icon: const Icon(Icons.settings),
              label: const Text('Settings'),
            ),
            const _Sep(),
            OutlinedButton.icon(
              onPressed: () => _exportData(context),
              icon: const Icon(Icons.download),
              label: const Text('Export data'),
            ),
            const SizedBox(width: 6),
            OutlinedButton.icon(
              onPressed: () => _confirmClear(context),
              icon: const Icon(Icons.delete_outline),
              label: const Text('Clear all'),
              style: OutlinedButton.styleFrom(
                foregroundColor: Theme.of(context).colorScheme.error,
              ),
            ),
            const Spacer(),
            const _ZoomReadout(),
          ],
        ),
      ),
    );
  }

  Future<void> _exportData(BuildContext context) async {
    final scope = AppScope.of(context);
    final messenger = ScaffoldMessenger.of(context);
    try {
      final result = await scope.exporter.exportData(
        buffer: scope.session.packets,
        layout: scope.layout,
      );
      messenger.showSnackBar(
        SnackBar(content: Text('Exported to ${result.path}')),
      );
    } catch (e) {
      messenger.showSnackBar(
        SnackBar(content: Text('Export failed: $e')),
      );
    }
  }

  Future<void> _confirmClear(BuildContext context) async {
    final ok = await showDialog<bool>(
      context: context,
      builder: (_) => const ClearConfirmDialog(),
    );
    if (ok == true && context.mounted) {
      AppScope.of(context).session.clearAll();
    }
  }
}

class _Sep extends StatelessWidget {
  const _Sep();
  @override
  Widget build(BuildContext context) => Container(
        width: 1,
        height: 22,
        margin: const EdgeInsets.symmetric(horizontal: 8),
        color: Theme.of(context).colorScheme.outlineVariant,
      );
}

class _ZoomReadout extends StatelessWidget {
  const _ZoomReadout();
  @override
  Widget build(BuildContext context) {
    final scope = AppScope.of(context);
    return ValueListenableBuilder<int>(
      valueListenable: scope.session.frameTick,
      builder: (_, __, ___) {
        final view = scope.session.viewState;
        final newest = scope.session.packets.newest;
        final nowUs = newest?.timestampUs.toInt() ??
            DateTime.now().microsecondsSinceEpoch;
        final win = view.currentWindow(
          nowUs: nowUs,
          oldestUs: scope.session.packets.oldest?.timestampUs.toInt() ?? nowUs,
          newestUs: nowUs,
        );
        final widthMs = view.windowWidth.inMilliseconds;
        final centerUs = (win.startUs + win.endUs) ~/ 2;
        final dt = DateTime.fromMicrosecondsSinceEpoch(centerUs);
        final widthStr = widthMs >= 1000
            ? '${(widthMs / 1000).toStringAsFixed(2)} s'
            : '$widthMs ms';
        final hh = dt.hour.toString().padLeft(2, '0');
        final mm = dt.minute.toString().padLeft(2, '0');
        final ss = dt.second.toString().padLeft(2, '0');
        final ms = dt.millisecond.toString().padLeft(3, '0');
        return Text(
          'Window: $widthStr  ·  Center: $hh:$mm:$ss.$ms',
          style: const TextStyle(
              fontFamily: 'monospace', fontSize: 12, color: Colors.grey),
        );
      },
    );
  }
}