import 'package:flutter/services.dart';

/// Thin Dart wrapper over the native DJI Mobile SDK bridge.
///
/// Mirrors the channels defined in `DjiSdkBridge.kt` (+ its per-subsystem
/// helpers):
///  * method channel `dji_msdk/methods` for imperative calls
///  * event  channel `dji_msdk/events`  for the SDK's async updates
///
/// Every method returns cleanly whether or not a product is connected; the
/// native side answers with a typed error the UI can surface. The event stream
/// carries maps keyed by `type`: `registration`, `connection`, `identity`,
/// `telemetry`, `battery`, `camera`, `exposure`, `gimbal`, `mission`,
/// `mediaList`, `mediaDownload`, `djiAccount`, `database`, `init`.
class DjiService {
  static const MethodChannel _methods = MethodChannel('dji_msdk/methods');
  static const EventChannel _events = EventChannel('dji_msdk/events');

  Stream<Map<String, dynamic>> events() {
    return _events
        .receiveBroadcastStream()
        .map((dynamic e) => Map<String, dynamic>.from(e as Map));
  }

  // ── SDK / registration / connection ─────────────────────────────────────────
  Future<String> getSdkVersion() async =>
      await _methods.invokeMethod<String>('getSdkVersion') ?? 'unknown';

  Future<void> registerApp() => _methods.invokeMethod<void>('registerApp');

  Future<bool> startConnection() async =>
      await _methods.invokeMethod<bool>('startConnection') ?? false;

  Future<void> stopConnection() => _methods.invokeMethod<void>('stopConnection');

  Future<Map<String, dynamic>> getProductInfo() async {
    final dynamic info = await _methods.invokeMethod('getProductInfo');
    return Map<String, dynamic>.from(info as Map);
  }

  // ── Flight controller commands ──────────────────────────────────────────────
  Future<void> takeOff() => _methods.invokeMethod<void>('takeOff');
  Future<void> land() => _methods.invokeMethod<void>('land');
  Future<void> confirmLanding() => _methods.invokeMethod<void>('confirmLanding');
  Future<void> cancelLanding() => _methods.invokeMethod<void>('cancelLanding');
  Future<void> startGoHome() => _methods.invokeMethod<void>('startGoHome');
  Future<void> cancelGoHome() => _methods.invokeMethod<void>('cancelGoHome');
  Future<void> setHomeToCurrent() => _methods.invokeMethod<void>('setHomeToCurrent');

  // ── Flight settings (Safety / Control) ──────────────────────────────────────
  Future<void> setMaxFlightHeight(int m) =>
      _methods.invokeMethod<void>('setMaxFlightHeight', <String, dynamic>{'value': m});
  Future<void> setMaxFlightRadius(int m) =>
      _methods.invokeMethod<void>('setMaxFlightRadius', <String, dynamic>{'value': m});
  Future<void> setMaxRadiusEnabled(bool on) =>
      _methods.invokeMethod<void>('setMaxRadiusEnabled', <String, dynamic>{'value': on});
  Future<void> setGoHomeHeight(int m) =>
      _methods.invokeMethod<void>('setGoHomeHeight', <String, dynamic>{'value': m});
  Future<void> setNoviceMode(bool on) =>
      _methods.invokeMethod<void>('setNoviceMode', <String, dynamic>{'value': on});
  Future<void> setObstacleAvoidance(bool on) =>
      _methods.invokeMethod<void>('setObstacleAvoidance', <String, dynamic>{'value': on});

  // ── Camera ──────────────────────────────────────────────────────────────────
  /// mode: `photo` | `video` | `mediaDownload` | `playback`
  Future<void> setCameraMode(String mode) =>
      _methods.invokeMethod<void>('setCameraMode', <String, dynamic>{'mode': mode});
  Future<void> startShootPhoto() => _methods.invokeMethod<void>('startShootPhoto');
  Future<void> stopShootPhoto() => _methods.invokeMethod<void>('stopShootPhoto');
  Future<void> startRecordVideo() => _methods.invokeMethod<void>('startRecordVideo');
  Future<void> stopRecordVideo() => _methods.invokeMethod<void>('stopRecordVideo');

  /// mode: SINGLE | HDR | BURST | AEB | INTERVAL | PANORAMA
  Future<void> setShootPhotoMode(String mode) =>
      _methods.invokeMethod<void>('setShootPhotoMode', <String, dynamic>{'mode': mode});

  /// program: `auto` (PROGRAM) | `pro` (MANUAL)
  Future<void> setExposureProgram(String program) =>
      _methods.invokeMethod<void>('setExposureProgram', <String, dynamic>{'program': program});
  Future<void> setISO(String value) =>
      _methods.invokeMethod<void>('setISO', <String, dynamic>{'value': value});
  Future<void> setShutterSpeed(String value) =>
      _methods.invokeMethod<void>('setShutterSpeed', <String, dynamic>{'value': value});
  Future<void> setAperture(String value) =>
      _methods.invokeMethod<void>('setAperture', <String, dynamic>{'value': value});
  Future<void> setEV(String value) =>
      _methods.invokeMethod<void>('setEV', <String, dynamic>{'value': value});
  Future<void> setWhiteBalance(String value) =>
      _methods.invokeMethod<void>('setWhiteBalance', <String, dynamic>{'value': value});
  Future<void> setHistogramEnabled(bool on) =>
      _methods.invokeMethod<void>('setHistogramEnabled', <String, dynamic>{'value': on});

  // ── Gimbal ──────────────────────────────────────────────────────────────────
  Future<void> rotateGimbalPitch(double deg) =>
      _methods.invokeMethod<void>('rotateGimbalPitch', <String, dynamic>{'pitch': deg});
  Future<void> resetGimbal() => _methods.invokeMethod<void>('resetGimbal');

  // ── Missions ────────────────────────────────────────────────────────────────
  /// points: [{lat, lon, altitude}], finishAction: NO_ACTION|GO_HOME|AUTO_LAND|GO_FIRST_WAYPOINT
  Future<void> uploadWaypointMission(
    List<Map<String, dynamic>> points, {
    double speed = 8,
    String finishAction = 'NO_ACTION',
  }) =>
      _methods.invokeMethod<void>('uploadWaypointMission', <String, dynamic>{
        'points': points,
        'speed': speed,
        'finishAction': finishAction,
      });
  Future<void> startWaypointMission() => _methods.invokeMethod<void>('startWaypointMission');
  Future<void> stopWaypointMission() => _methods.invokeMethod<void>('stopWaypointMission');
  Future<void> pauseWaypointMission() => _methods.invokeMethod<void>('pauseWaypointMission');
  Future<void> resumeWaypointMission() => _methods.invokeMethod<void>('resumeWaypointMission');

  /// Rect is normalized 0..1 in the live view. mode: TRACE|PROFILE|SPOTLIGHT|QUICK_SHOT
  Future<void> startActiveTrack(
    double x,
    double y,
    double w,
    double h, {
    String mode = 'TRACE',
  }) =>
      _methods.invokeMethod<void>('startActiveTrack', <String, dynamic>{
        'x': x,
        'y': y,
        'w': w,
        'h': h,
        'mode': mode,
      });
  Future<void> stopActiveTrack() => _methods.invokeMethod<void>('stopActiveTrack');

  /// A DJI-Fly QuickShot by name (Dronie/Rocket/Circle/Helix/Boomerang/Asteroid).
  /// The native side maps each to the closest real operator or returns a typed
  /// "unsupported on this aircraft" error.
  Future<void> startQuickShot(String name) =>
      _methods.invokeMethod<void>('startQuickShot', <String, dynamic>{'name': name});

  // ── Media (MediaManager) ────────────────────────────────────────────────────
  Future<void> refreshMediaList() => _methods.invokeMethod<void>('refreshMediaList');
  Future<String?> fetchThumbnail(int index) =>
      _methods.invokeMethod<String>('fetchThumbnail', <String, dynamic>{'index': index});
  Future<String?> downloadMedia(int index) =>
      _methods.invokeMethod<String>('downloadMedia', <String, dynamic>{'index': index});
  Future<void> deleteMedia(int index) =>
      _methods.invokeMethod<void>('deleteMedia', <String, dynamic>{'index': index});

  // ── DJI account (optional) ──────────────────────────────────────────────────
  Future<void> djiLogin() => _methods.invokeMethod<void>('djiLogin');
  Future<void> djiLogout() => _methods.invokeMethod<void>('djiLogout');
  Future<void> refreshDjiAccountState() => _methods.invokeMethod<void>('getDjiAccountState');
}