import 'package:flutter/material.dart';

import '../services.dart';
import '../theme.dart';
import '../uplink/uplink.dart';
import 'flight_tab.dart';
import 'logbook_tab.dart';
import 'nearby_tab.dart';
import 'settings_page.dart';

/// Signed-in home: Flight (session), Nearby (Remote ID receiver), Logbook.
class AgentShell extends StatefulWidget {
  const AgentShell({super.key});

  @override
  State<AgentShell> createState() => _AgentShellState();
}

class _AgentShellState extends State<AgentShell> {
  int _tab = 0;
  bool _started = false;

  @override
  void didChangeDependencies() {
    super.didChangeDependencies();
    if (_started) return;
    _started = true;
    // Signing in is what turns the Agent on: GPS, the receiver and the uplink
    // all start here so the pilot only has to open DJI Fly.
    final Services s = Services.of(context);
    WidgetsBinding.instance.addPostFrameCallback((_) async {
      await s.pilot.start();
      if (!s.rid.running) {
        try {
          await s.rid.start();
        } catch (_) {
          // Shown on the Nearby tab; the session still works by hand.
        }
      }
      s.uplink.enable(s.api.serverUrl);
    });
  }

  @override
  Widget build(BuildContext context) {
    const List<String> titles = <String>['Flight', 'Nearby aircraft', 'Logbook'];
    return Scaffold(
      appBar: AppBar(
        title: Text(titles[_tab]),
        actions: <Widget>[
          const _UplinkChip(),
          IconButton(
            tooltip: 'Settings',
            icon: const Icon(Icons.settings_outlined),
            onPressed: () => Navigator.of(context).push(MaterialPageRoute<void>(builder: (_) => const SettingsPage())),
          ),
        ],
      ),
      body: IndexedStack(index: _tab, children: const <Widget>[FlightTab(), NearbyTab(), LogbookTab()]),
      bottomNavigationBar: NavigationBar(
        selectedIndex: _tab,
        onDestinationSelected: (int i) => setState(() => _tab = i),
        destinations: const <NavigationDestination>[
          NavigationDestination(icon: Icon(Icons.flight_takeoff), label: 'Flight'),
          NavigationDestination(icon: Icon(Icons.radar), label: 'Nearby'),
          NavigationDestination(icon: Icon(Icons.menu_book_outlined), label: 'Logbook'),
        ],
      ),
    );
  }
}

class _UplinkChip extends StatelessWidget {
  const _UplinkChip();

  @override
  Widget build(BuildContext context) {
    final Uplink uplink = Services.of(context).uplink;
    return ListenableBuilder(
      listenable: uplink,
      builder: (BuildContext context, _) {
        final (Color c, String t) = switch (uplink.status) {
          UplinkStatus.live => (PV.ready, 'LIVE'),
          UplinkStatus.connecting => (PV.inkMuted, 'IDLE'),
          UplinkStatus.offline => (PV.caution, 'OFFLINE'),
          UplinkStatus.off => (PV.inkMuted, 'OFF'),
        };
        return Tooltip(
          message: 'Live uplink to PilotVault',
          child: Padding(
            padding: const EdgeInsets.symmetric(horizontal: 4),
            child: Row(children: <Widget>[StatusDot(c), const SizedBox(width: 6), Text(t, style: PV.label)]),
          ),
        );
      },
    );
  }
}