// Yukart display — starter. A text readout of whatever svc-gw sends, proving the
// boundary contract before anything is drawn (initial plan, step 1).

import 'dart:math';

import 'package:flutter/material.dart';

import 'boundary.dart';
import 'net.dart';

/// Override for development, e.g. `--dart-define=YUKART_GW=ws://halogen.local:7700/`.
const defaultUrl = String.fromEnvironment('YUKART_GW', defaultValue: 'ws://192.168.55.1:7700/');

Future<void> main() async {
  WidgetsFlutterBinding.ensureInitialized();
  final usb = UsbLink();
  await usb.bindFor(Uri.parse(defaultUrl));
  final boundary = Boundary(defaultUrl)..start();
  runApp(YukartApp(boundary: boundary, usb: usb));
}

class YukartApp extends StatelessWidget {
  const YukartApp({super.key, required this.boundary, required this.usb});
  final Boundary boundary;
  final UsbLink usb;

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Yukart',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(colorSchemeSeed: Colors.teal, brightness: Brightness.dark, useMaterial3: true),
      home: ListenableBuilder(
        listenable: Listenable.merge([boundary, usb]),
        builder: (context, _) => Readout(boundary: boundary, usb: usb),
      ),
    );
  }
}

class Readout extends StatelessWidget {
  const Readout({super.key, required this.boundary, required this.usb});
  final Boundary boundary;
  final UsbLink usb;

  @override
  Widget build(BuildContext context) {
    final b = boundary;
    return Scaffold(
      body: SafeArea(
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: [
            // Mock data must look like mock data: on the surface, not in a menu.
            if (b.mock) const MockBanner(),
            LinkBar(boundary: b, usb: usb),
            Expanded(
              child: LayoutBuilder(
                builder: (context, c) {
                  final wide = c.maxWidth > 800;
                  final signals = SignalList(boundary: b);
                  final raw = RawLog(boundary: b);
                  return wide
                      ? Row(crossAxisAlignment: CrossAxisAlignment.stretch, children: [
                          Expanded(flex: 3, child: signals),
                          const VerticalDivider(width: 1),
                          Expanded(flex: 2, child: raw),
                        ])
                      : Column(children: [Expanded(child: signals), const Divider(height: 1), Expanded(child: raw)]);
                },
              ),
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton.extended(
        onPressed: () => showMarkSheet(context, b),
        icon: const Icon(Icons.flag),
        label: Text(b.pending.isEmpty ? 'Mark' : 'Mark (${b.pending.length} pending)'),
      ),
    );
  }
}

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

  @override
  Widget build(BuildContext context) {
    return Container(
      color: Colors.amber.shade700,
      padding: const EdgeInsets.symmetric(vertical: 6),
      child: const Text(
        'MOCK DATA — NOT FROM THE CAR',
        textAlign: TextAlign.center,
        style: TextStyle(color: Colors.black, fontWeight: FontWeight.w900, fontSize: 20, letterSpacing: 2),
      ),
    );
  }
}

class LinkBar extends StatelessWidget {
  const LinkBar({super.key, required this.boundary, required this.usb});
  final Boundary boundary;
  final UsbLink usb;

  @override
  Widget build(BuildContext context) {
    final b = boundary;
    final (color, label) = switch (b.state) {
      LinkState.up => (Colors.green, 'CONNECTED'),
      LinkState.connecting => (Colors.orange, 'CONNECTING'),
      LinkState.down => (Colors.red, 'DOWN'),
    };
    final age = b.lastMessage == null ? '—' : '${DateTime.now().difference(b.lastMessage!).inMilliseconds} ms';
    final offset = b.clockOffset == null ? '—' : '${(b.clockOffset!.inMilliseconds / 1000).toStringAsFixed(1)} s';
    return Material(
      color: Theme.of(context).colorScheme.surfaceContainerHigh,
      child: InkWell(
        onTap: () => editUrl(context, b, usb),
        child: Padding(
          padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 8),
          child: Wrap(spacing: 16, runSpacing: 4, crossAxisAlignment: WrapCrossAlignment.center, children: [
            Chip(label: Text(label), backgroundColor: color.withValues(alpha: 0.3)),
            Text(b.url, style: const TextStyle(fontFamily: 'monospace')),
            Text(b.detail),
            Text('last msg $age'),
            Text('Orin−tablet clock $offset'),
            if (usb.supported) Text('USB link ${usb.up ? 'up' : 'absent'}${usb.bound ? ', bound' : ''}'),
          ]),
        ),
      ),
    );
  }
}

class SignalList extends StatelessWidget {
  const SignalList({super.key, required this.boundary});
  final Boundary boundary;

  @override
  Widget build(BuildContext context) {
    final b = boundary;
    if (b.state != LinkState.up) {
      return const Center(child: Text('No link to the Orin'));
    }
    if (b.seen.isEmpty) {
      return Center(
        child: Text(
          'Connected — the Orin is sending no vehicle state\n(source: ${b.hello?['source'] ?? '?'})',
          textAlign: TextAlign.center,
        ),
      );
    }
    // Rows stay put: a signal that drops out is shown as missing, not removed.
    final names = b.seen.keys.toList()..sort();
    return ListView(
      padding: const EdgeInsets.all(12),
      children: [
        for (final n in names)
          b.signals[n] is Map
              ? SignalTile(name: n, envelope: Map<String, dynamic>.from(b.signals[n] as Map))
              : SignalTile(name: n, envelope: b.seen[n]!, missing: true),
      ],
    );
  }
}

/// Missing, known-without-value, stale and fresh each look different: all four are normal in a car.
class SignalTile extends StatelessWidget {
  const SignalTile({super.key, required this.name, required this.envelope, this.missing = false});
  final String name;

  /// The current envelope, or the last one seen when [missing] (only its unit is used then).
  final Map<String, dynamic> envelope;
  final bool missing;

  @override
  Widget build(BuildContext context) {
    if (missing) {
      return ListTile(
        title: Text(name, style: const TextStyle(fontFamily: 'monospace', color: Colors.grey)),
        subtitle: const Text('MISSING · not in the latest state', style: TextStyle(color: Colors.redAccent)),
        trailing: Text.rich(TextSpan(children: [
          const TextSpan(text: '?', style: TextStyle(fontSize: 34, color: Colors.grey)),
          TextSpan(text: '  ${envelope['unit'] ?? ''}', style: const TextStyle(fontSize: 16, color: Colors.grey)),
        ])),
      );
    }
    final v = envelope['value'];
    final quality = envelope['quality'] as String? ?? 'ok';
    final stale = quality != 'ok';
    final text = v == null ? '—' : (v is double && v == v.roundToDouble() ? v.toInt().toString() : '$v');
    final style = TextStyle(
      fontSize: 34,
      fontWeight: FontWeight.w600,
      fontFeatures: const [FontFeature.tabularFigures()],
      color: stale || v == null ? Colors.grey : null,
      fontStyle: stale ? FontStyle.italic : null,
    );
    return ListTile(
      title: Text(name, style: const TextStyle(fontFamily: 'monospace')),
      subtitle: Text([
        if (stale) quality.toUpperCase(),
        if (v == null) 'no value',
        if (envelope['mock'] == true) 'mock',
      ].join(' · ')),
      trailing: Text.rich(TextSpan(children: [
        TextSpan(text: text, style: style),
        TextSpan(text: '  ${envelope['unit'] ?? ''}', style: const TextStyle(fontSize: 16)),
      ])),
    );
  }
}

class RawLog extends StatelessWidget {
  const RawLog({super.key, required this.boundary});
  final Boundary boundary;

  @override
  Widget build(BuildContext context) {
    final b = boundary;
    return ListView(
      padding: const EdgeInsets.all(8),
      children: [
        if (b.pending.isNotEmpty || b.acks.isNotEmpty) ...[
          Text('Commands', style: Theme.of(context).textTheme.titleSmall),
          for (final p in b.pending) Text('… ${p.cmd} ${p.args['text'] ?? ''} (unacked)'),
          for (final a in b.acks) Text('${a.ok ? '✓' : '✗'} ${a.detail}', style: TextStyle(color: a.ok ? null : Colors.redAccent)),
          const Divider(),
        ],
        Text('Raw messages, newest first', style: Theme.of(context).textTheme.titleSmall),
        for (final r in b.recent)
          Padding(
            padding: const EdgeInsets.symmetric(vertical: 2),
            child: Text(r, style: const TextStyle(fontFamily: 'monospace', fontSize: 11)),
          ),
      ],
    );
  }
}

const quickMarks = ['cold start', 'engine start', 'indicator left', 'indicator right', 'brake', 'headlights', 'something odd'];

Future<void> showMarkSheet(BuildContext context, Boundary b) {
  final custom = TextEditingController();
  return showModalBottomSheet(
    context: context,
    isScrollControlled: true,
    useSafeArea: true,
    builder: (ctx) {
      void send(String text) {
        if (text.trim().isEmpty) return;
        b.command('mark', {'text': text.trim()});
        Navigator.pop(ctx);
      }

      return Padding(
        // Clear the keyboard when it is up, the navigation bar when it is not.
        padding: EdgeInsets.fromLTRB(16, 16, 16, 16 + max(MediaQuery.of(ctx).viewInsets.bottom, MediaQuery.of(ctx).viewPadding.bottom)),
        child: Column(mainAxisSize: MainAxisSize.min, crossAxisAlignment: CrossAxisAlignment.stretch, children: [
          Text('Stamp into the recording', style: Theme.of(ctx).textTheme.titleMedium),
          const SizedBox(height: 8),
          Wrap(spacing: 8, runSpacing: 8, children: [
            for (final q in quickMarks) ActionChip(label: Text(q), onPressed: () => send(q)),
          ]),
          TextField(controller: custom, decoration: const InputDecoration(labelText: 'Other'), onSubmitted: send),
        ]),
      );
    },
  );
}

Future<void> editUrl(BuildContext context, Boundary b, UsbLink usb) async {
  final c = TextEditingController(text: b.url);
  final url = await showDialog<String>(
    context: context,
    builder: (ctx) => AlertDialog(
      title: const Text('Gateway address'),
      content: TextField(controller: c, autofocus: true),
      actions: [
        TextButton(onPressed: () => Navigator.pop(ctx), child: const Text('Cancel')),
        TextButton(onPressed: () => Navigator.pop(ctx, c.text.trim()), child: const Text('Connect')),
      ],
    ),
  );
  if (url == null || url.isEmpty) return;
  await usb.bindFor(Uri.parse(url));
  b.retarget(url);
}