import 'dart:math' as math;

import 'package:flutter/material.dart';

import '../../../dji_service.dart';
import '../../../flight_model.dart';
import '../../../fly/camera_menu.dart';
import '../../../fly/hud_features.dart';
import '../../../fly/state/camera_state.dart';
import '../../../theme.dart';
import '../../pv_icons.dart';
import '../hud_kit.dart';
import '../panels/camera_write.dart';

/// The right camera column (plan P4): AE lock · photo / video switch ·
/// shutter (photo, record with its timer, interval / panorama progress ring) ·
/// MENU · playback and capture modes.
///
/// The shutter follows the camera's own state: while an interval, burst or
/// panorama is running it shows a stop square and the press stops it.
class CameraColumn extends StatefulWidget {
  const CameraColumn({
    super.key,
    required this.model,
    required this.dji,
    required this.onCameraMenu,
    required this.onPlayback,
    required this.onCaptureModes,
    required this.onError,
  });

  final FlightModel model;
  final DjiService dji;
  final VoidCallback onCameraMenu;
  final VoidCallback onPlayback;
  final VoidCallback onCaptureModes;
  final void Function(String label, Object error) onError;

  @override
  State<CameraColumn> createState() => _CameraColumnState();
}

class _CameraColumnState extends State<CameraColumn> {
  FlightModel get _m => widget.model;
  CameraState get _cam => _m.camera;

  /// The camera's own mode once it has reported one; the switch's choice before that.
  bool get _video => _cam.mode == null ? _m.captureMode == CaptureMode.video : _cam.isVideoMode;

  Future<void> _run(String label, Future<void> Function() action) async {
    try {
      await action();
    } catch (e) {
      widget.onError(label, e);
    }
  }

  Future<void> _shutter() async {
    if (_video) {
      await _run(_cam.isRecording ? 'Stop recording' : 'Start recording',
          _cam.isRecording ? widget.dji.stopRecordVideo : widget.dji.startRecordVideo);
    } else if (_cam.shootingContinuous) {
      await _run('Stop shooting', widget.dji.stopShootPhoto);
    } else {
      await _run('Shoot photo', widget.dji.startShootPhoto);
    }
  }

  Future<void> _setMode(bool video) async {
    if (video == _video) return;
    setState(() => _m.captureMode = video ? CaptureMode.video : CaptureMode.photo);
    _cam.setModeOptimistic(video ? 'RECORD_VIDEO' : 'SHOOT_PHOTO');
    await _run('Set camera mode', () => widget.dji.setCameraMode(video ? 'video' : 'photo'));
  }

  Future<void> _toggleAeLock() {
    final bool next = !(_cam.aeLock ?? false);
    return writeCameraSetting(
      _cam,
      label: 'AE lock',
      pending: <String, Object?>{'aeLock': next},
      send: () => widget.dji.setCameraValue('aeLock', next),
      onError: widget.onError,
    );
  }

  @override
  Widget build(BuildContext context) {
    return ListenableBuilder(
      listenable: _cam,
      builder: (BuildContext context, _) {
        final bool video = _video;
        final bool locked = _cam.settings['aeLock'] == true;
        return Column(mainAxisSize: MainAxisSize.min, children: <Widget>[
          _Pill(
            key: const ValueKey<String>('ae-lock'),
            label: 'AE',
            color: locked ? Glass.accent : Glass.pillStrong,
            width: 44,
            height: 26,
            onTap: _toggleAeLock,
          ),
          const SizedBox(height: 8),
          Container(
            padding: const EdgeInsets.all(3),
            decoration: BoxDecoration(color: Glass.pill, borderRadius: BorderRadius.circular(10)),
            child: Column(children: <Widget>[
              _modeBtn('image', active: !video, onTap: () => _setMode(false), key: const ValueKey<String>('mode-photo')),
              _modeBtn('video', active: video, onTap: () => _setMode(true), key: const ValueKey<String>('mode-video')),
            ]),
          ),
          const SizedBox(height: 8),
          ShutterButton(camera: _cam, video: video, onTap: _shutter),
          SizedBox(
            height: 14,
            child: Center(child: Text(_caption(video), style: HudText.label.copyWith(color: Glass.ink))),
          ),
          const SizedBox(height: 6),
          _Pill(key: const ValueKey<String>('camera-menu'), label: 'MENU', width: 44, height: 28, onTap: widget.onCameraMenu),
          const SizedBox(height: 8),
          Row(mainAxisSize: MainAxisSize.min, children: <Widget>[
            Requires(
              HudFeatures.playback,
              child: _Round(key: const ValueKey<String>('playback'), icon: 'play', onTap: widget.onPlayback),
            ),
            const SizedBox(width: 4),
            _Round(key: const ValueKey<String>('capture-modes'), icon: 'aperture', onTap: widget.onCaptureModes),
          ]),
        ]);
      },
    );
  }

  /// Under the shutter: the record timer, or the photo mode.
  String _caption(bool video) {
    if (video) return _cam.isRecording ? _clock(_cam.recordSeconds) : '';
    if (_cam.shootingPanorama) return 'PANO ${_cam.panoramaProgress}%';
    final String? mode = _cam.shootPhotoMode;
    if (mode == null || mode == 'SINGLE') return '';
    final String label = CameraLabels.of(mode).toUpperCase();
    return switch (mode) {
      'INTERVAL' when _cam.intervalSeconds != null => '$label ${_cam.intervalSeconds}s',
      'BURST' when _cam.setting('burstCount') is String => '$label ${CameraLabels.of(_cam.setting('burstCount')! as String)}',
      'AEB' when _cam.setting('aebCount') is String => '$label ${CameraLabels.of(_cam.setting('aebCount')! as String)}',
      _ => label,
    };
  }

  static String _clock(int s) => '${(s ~/ 60).toString().padLeft(2, '0')}:${(s % 60).toString().padLeft(2, '0')}';

  Widget _modeBtn(String icon, {required bool active, required VoidCallback onTap, Key? key}) => GestureDetector(
        key: key,
        onTap: onTap,
        child: Container(
          width: 38,
          height: 26,
          margin: const EdgeInsets.symmetric(vertical: 1),
          decoration: BoxDecoration(color: active ? Glass.accent : Colors.transparent, borderRadius: BorderRadius.circular(7)),
          alignment: Alignment.center,
          child: PVIcon(icon, size: 15, stroke: 1.8, color: Glass.ink),
        ),
      );
}

/// The shutter: white disc for photo, red for video, a red square while
/// recording, and a stop square inside a progress ring while an interval or
/// panorama runs (interval: one turn per interval; panorama: its progress).
class ShutterButton extends StatefulWidget {
  const ShutterButton({super.key, required this.camera, required this.video, required this.onTap});

  final CameraState camera;
  final bool video;
  final VoidCallback onTap;

  @override
  State<ShutterButton> createState() => _ShutterButtonState();
}

class _ShutterButtonState extends State<ShutterButton> with SingleTickerProviderStateMixin {
  late final AnimationController _interval = AnimationController(vsync: this);

  @override
  void didUpdateWidget(covariant ShutterButton old) {
    super.didUpdateWidget(old);
    _syncInterval();
  }

  @override
  void initState() {
    super.initState();
    _syncInterval();
  }

  void _syncInterval() {
    final CameraState c = widget.camera;
    final int seconds = c.intervalSeconds ?? 0;
    if (!widget.video && c.shootingInterval && seconds > 0) {
      final Duration d = Duration(seconds: seconds);
      if (!_interval.isAnimating || _interval.duration != d) {
        _interval.duration = d;
        _interval.repeat();
      }
    } else if (_interval.isAnimating) {
      _interval.stop();
      _interval.value = 0;
    }
  }

  @override
  void dispose() {
    _interval.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    final CameraState c = widget.camera;
    final bool recording = widget.video && c.isRecording;
    final bool running = !widget.video && c.shootingContinuous;
    final double? ring = !running
        ? null
        : c.shootingPanorama
            ? c.panoramaProgress / 100
            : null; // interval: animated below; burst: no progress to show
    Widget inner;
    if (recording || running) {
      inner = Container(width: 22, height: 22, decoration: BoxDecoration(color: Glass.rec, borderRadius: BorderRadius.circular(5)));
    } else {
      inner = Container(width: 44, height: 44, decoration: BoxDecoration(color: widget.video ? Glass.rec : Colors.white, shape: BoxShape.circle));
    }
    return GestureDetector(
      key: const ValueKey<String>('shutter'),
      onTap: widget.onTap,
      child: SizedBox(
        width: 60,
        height: 60,
        child: Stack(alignment: Alignment.center, children: <Widget>[
          Container(decoration: BoxDecoration(shape: BoxShape.circle, border: Border.all(color: const Color(0xD9FFFFFF), width: 4))),
          if (running)
            AnimatedBuilder(
              animation: _interval,
              builder: (BuildContext context, _) => CustomPaint(
                size: const Size(60, 60),
                painter: _RingPainter(ring ?? (c.shootingInterval ? _interval.value : 1)),
              ),
            ),
          inner,
        ]),
      ),
    );
  }
}

class _RingPainter extends CustomPainter {
  const _RingPainter(this.progress);

  final double progress;

  @override
  void paint(Canvas canvas, Size size) {
    final Rect r = (Offset.zero & size).deflate(2);
    canvas.drawArc(
      r,
      -math.pi / 2,
      2 * math.pi * progress.clamp(0, 1),
      false,
      Paint()
        ..color = Glass.accent
        ..style = PaintingStyle.stroke
        ..strokeWidth = 4
        ..strokeCap = StrokeCap.round,
    );
  }

  @override
  bool shouldRepaint(covariant _RingPainter old) => old.progress != progress;
}

class _Pill extends StatelessWidget {
  const _Pill({super.key, required this.label, required this.onTap, this.color = Glass.pillStrong, this.width = 44, this.height = 28});

  final String label;
  final VoidCallback onTap;
  final Color color;
  final double width;
  final double height;

  @override
  Widget build(BuildContext context) => GestureDetector(
        onTap: onTap,
        child: Container(
          width: width,
          height: height,
          decoration: BoxDecoration(color: color, borderRadius: BorderRadius.circular(8), border: Border.all(color: Glass.hairline)),
          alignment: Alignment.center,
          child: Text(label, style: const TextStyle(fontFamily: PV.fontMono, fontSize: 10, fontWeight: FontWeight.w700, color: Glass.ink)),
        ),
      );
}

class _Round extends StatelessWidget {
  const _Round({super.key, required this.icon, required this.onTap});

  final String icon;
  final VoidCallback onTap;

  @override
  Widget build(BuildContext context) => GestureDetector(
        onTap: onTap,
        child: Container(
          width: 30,
          height: 30,
          decoration: BoxDecoration(color: Glass.pillStrong, shape: BoxShape.circle, border: Border.all(color: Glass.hairline)),
          alignment: Alignment.center,
          child: PVIcon(icon, size: 14, stroke: 1.8, color: Glass.ink),
        ),
      );
}