import 'dart:async';

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

import '../dji_service.dart';
import '../flight_model.dart';
import '../pb_auth.dart';
import '../theme.dart';
import 'flight_logs_page.dart';
import 'pv_icons.dart';
import 'routes_page.dart';

/// Profile — mirrors the v2 "Profile" mockup. Shows the PilotVault identity and
/// (optionally) the linked DJI account, headline stats, and library shortcuts.
class ProfilePage extends StatefulWidget {
  const ProfilePage({
    super.key,
    required this.model,
    required this.dji,
    required this.onAppSettings,
    required this.onSignIn,
  });

  final FlightModel model;
  final DjiService dji;
  final VoidCallback onAppSettings;
  final VoidCallback onSignIn;

  @override
  State<ProfilePage> createState() => _ProfilePageState();
}

class _ProfilePageState extends State<ProfilePage> {
  StreamSubscription<AuthStatus>? _authSub;

  DjiService get _dji => widget.dji;
  FlightModel get _m => widget.model;

  @override
  void initState() {
    super.initState();
    _authSub = auth.status.listen((_) {
      if (mounted) setState(() {});
    });
    widget.dji.refreshDjiAccountState().catchError((_) {});
  }

  @override
  void dispose() {
    _authSub?.cancel();
    super.dispose();
  }

  void _snack(String msg) {
    ScaffoldMessenger.of(context)
      ..clearSnackBars()
      ..showSnackBar(SnackBar(content: Text(msg)));
  }

  Future<void> _djiLogin() async {
    try {
      await _dji.djiLogin();
      _snack('DJI account linked');
    } catch (e) {
      _snack('DJI login: ${e is PlatformException ? (e.message ?? e.code) : e}');
    }
  }

  Future<void> _djiLogout() async {
    try {
      await _dji.djiLogout();
    } catch (_) {}
  }

  bool get _djiLinked => _m.djiAccountState == 'AUTHORIZED';

  @override
  Widget build(BuildContext context) {
    final PVScheme s = PVScheme.of(context);
    final bool signedIn = auth.isAuthed;
    return Scaffold(
      backgroundColor: s.bgApp,
      body: SafeArea(
        child: AnimatedBuilder(
          animation: _m,
          builder: (BuildContext context, _) => ListView(
            children: <Widget>[
              _headerBar(s),
              _identity(s, signedIn),
              _stats(s),
              _djiCard(s),
              const SizedBox(height: 6),
              ..._rows(s),
            ],
          ),
        ),
      ),
    );
  }

  Widget _headerBar(PVScheme s) => Padding(
        padding: const EdgeInsets.fromLTRB(12, 6, 12, 0),
        child: Row(children: <Widget>[
          IconButton(onPressed: () => Navigator.of(context).maybePop(), icon: PVIcon('chevronLeft', size: 24, color: s.textSecondary)),
          const Spacer(),
          IconButton(onPressed: widget.onAppSettings, icon: PVIcon('settings', size: 20, color: s.textSecondary)),
        ]),
      );

  Widget _identity(PVScheme s, bool signedIn) {
    return Padding(
      padding: const EdgeInsets.fromLTRB(20, 6, 20, 16),
      child: Row(children: <Widget>[
        Container(
          width: 60, height: 60,
          decoration: BoxDecoration(color: s.accentSoft, shape: BoxShape.circle),
          alignment: Alignment.center,
          child: PVIcon('user', size: 30, color: s.accent),
        ),
        const SizedBox(width: 14),
        Expanded(
          child: Column(crossAxisAlignment: CrossAxisAlignment.start, children: <Widget>[
            Text(signedIn ? (auth.userEmail.isEmpty ? 'PilotVault pilot' : auth.userEmail) : 'Guest pilot',
                maxLines: 1, overflow: TextOverflow.ellipsis,
                style: TextStyle(fontFamily: PV.fontSans, fontSize: 18, fontWeight: FontWeight.w700, letterSpacing: -0.2, color: s.textPrimary)),
            const SizedBox(height: 2),
            Text(signedIn ? 'Verified pilot' : 'Not signed in',
                style: TextStyle(fontFamily: PV.fontMono, fontSize: 12, color: s.textSecondary)),
          ]),
        ),
        if (!signedIn)
          FilledButton(onPressed: widget.onSignIn, child: const Text('Sign in')),
      ]),
    );
  }

  Widget _stats(PVScheme s) {
    const List<(String, String)> stats = <(String, String)>[('Flights', '—'), ('Distance', '—'), ('Flight time', '—')];
    return Container(
      margin: const EdgeInsets.fromLTRB(20, 0, 20, 18),
      decoration: BoxDecoration(color: s.surface, borderRadius: BorderRadius.circular(16), border: Border.all(color: s.border), boxShadow: s.shadowXs),
      child: Row(children: <Widget>[
        for (int i = 0; i < stats.length; i++)
          Expanded(
            child: Container(
              decoration: BoxDecoration(border: Border(left: i == 0 ? BorderSide.none : BorderSide(color: s.border))),
              padding: const EdgeInsets.symmetric(vertical: 14),
              child: Column(children: <Widget>[
                Text(stats[i].$2, style: TextStyle(fontFamily: PV.fontMono, fontSize: 19, fontWeight: FontWeight.w700, color: s.textPrimary)),
                const SizedBox(height: 2),
                Text(stats[i].$1, style: TextStyle(fontFamily: PV.fontSans, fontSize: 11.5, color: s.textSecondary)),
              ]),
            ),
          ),
      ]),
    );
  }

  Widget _djiCard(PVScheme s) {
    return Container(
      margin: const EdgeInsets.fromLTRB(20, 0, 20, 8),
      padding: const EdgeInsets.symmetric(horizontal: 14, vertical: 12),
      decoration: BoxDecoration(color: s.surface, borderRadius: BorderRadius.circular(14), border: Border.all(color: s.border)),
      child: Row(children: <Widget>[
        Container(
          width: 34, height: 34,
          decoration: BoxDecoration(color: s.surfaceInset, borderRadius: BorderRadius.circular(9)),
          alignment: Alignment.center,
          child: PVIcon('drone', size: 18, color: s.textSecondary),
        ),
        const SizedBox(width: 12),
        Expanded(child: Column(crossAxisAlignment: CrossAxisAlignment.start, children: <Widget>[
          Text('DJI account', style: TextStyle(fontFamily: PV.fontSans, fontSize: 14, fontWeight: FontWeight.w600, color: s.textPrimary)),
          Text(_djiLinked ? (_m.djiAccountUser ?? 'Linked') : 'Optional · unlocks NFZ & sync',
              style: TextStyle(fontFamily: PV.fontMono, fontSize: 11, color: s.textSecondary)),
        ])),
        _djiLinked
            ? TextButton(onPressed: _djiLogout, child: const Text('Unlink'))
            : FilledButton(onPressed: _djiLogin, child: const Text('Link')),
      ]),
    );
  }

  List<Widget> _rows(PVScheme s) {
    final List<(String, String, VoidCallback)> rows = <(String, String, VoidCallback)>[
      ('gauge', 'Flight records', () => _push(const FlightLogsPage())),
      ('route', 'My routes', () => _push(const RoutesPage())),
      ('download', 'Downloads', () => _snack('Downloaded media is saved to the app files folder')),
      ('shield', 'Find my drone', _findDrone),
      ('settings', 'App settings', widget.onAppSettings),
    ];
    return <Widget>[
      for (int i = 0; i < rows.length; i++)
        Padding(
          padding: const EdgeInsets.symmetric(horizontal: 20),
          child: InkWell(
            onTap: rows[i].$3,
            child: Container(
              height: 52,
              decoration: BoxDecoration(border: Border(bottom: i < rows.length - 1 ? BorderSide(color: s.border) : BorderSide.none)),
              child: Row(children: <Widget>[
                Container(
                  width: 34, height: 34,
                  decoration: BoxDecoration(color: s.surfaceInset, borderRadius: BorderRadius.circular(9)),
                  alignment: Alignment.center,
                  child: PVIcon(rows[i].$1, size: 17, color: s.textSecondary),
                ),
                const SizedBox(width: 14),
                Expanded(child: Text(rows[i].$2, style: TextStyle(fontFamily: PV.fontSans, fontSize: 14.5, fontWeight: FontWeight.w500, color: s.textPrimary))),
                PVIcon('chevronRight', size: 18, color: s.textTertiary),
              ]),
            ),
          ),
        ),
    ];
  }

  void _push(Widget page) => Navigator.of(context).push(MaterialPageRoute<void>(builder: (_) => page));

  void _findDrone() {
    if (_m.latitude != null && _m.longitude != null) {
      _snack('Aircraft at ${_m.latitude!.toStringAsFixed(5)}, ${_m.longitude!.toStringAsFixed(5)}');
    } else {
      _snack('No aircraft GPS fix available');
    }
  }
}