import 'package:flutter/foundation.dart';

import 'uploader.dart';

enum RegistrationState { idle, registering, success, failed }

/// Camera capture family, mirrors the right-rail Photo/Video/Pano switch.
enum CaptureMode { photo, video, pano }

/// Exposure program — Auto (PROGRAM) vs Pro (MANUAL) tab on Camera settings.
enum ExposureProgram { auto, pro }

/// A media file listed off the aircraft's SD card by the native MediaManager.
class MediaItem {
  MediaItem({
    required this.index,
    required this.fileName,
    required this.isVideo,
    this.durationSeconds,
    this.sizeBytes,
    this.createdMs,
    this.thumbPath,
    this.localPath,
  });

  final int index;
  final String fileName;
  final bool isVideo;
  final int? durationSeconds;
  final int? sizeBytes;
  final int? createdMs;

  /// On-disk path of the fetched thumbnail (cache dir), once available.
  String? thumbPath;

  /// On-disk path of the fully downloaded original, once available.
  String? localPath;

  String? get durationLabel {
    if (durationSeconds == null) return null;
    final int s = durationSeconds!;
    final String mm = (s ~/ 60).toString();
    final String ss = (s % 60).toString().padLeft(2, '0');
    return '$mm:$ss';
  }

  factory MediaItem.fromMap(Map<String, dynamic> m) => MediaItem(
        index: (m['index'] as num).toInt(),
        fileName: (m['fileName'] as String?) ?? 'file',
        isVideo: (m['type'] as String?) == 'video',
        durationSeconds: (m['durationSeconds'] as num?)?.toInt(),
        sizeBytes: (m['sizeBytes'] as num?)?.toInt(),
        createdMs: (m['createdMs'] as num?)?.toInt(),
      );
}

/// Live aircraft/session state, shared across every screen. `_HomePageState`
/// owns the DJI/uploader plumbing and pushes updates here; the screens observe
/// it via [AnimatedBuilder]. Call [bump] after a batch of field writes.
class FlightModel extends ChangeNotifier {
  // ── SDK / registration / connection ────────────────────────────────────────
  String sdkVersion = '…';
  RegistrationState registration = RegistrationState.idle;
  String? registrationError;
  bool connected = false;
  String? model;
  String? firmwareVersion;

  // ── Flight controller telemetry ────────────────────────────────────────────
  int? satellites;
  int? gpsSignalLevel; // 0..5
  bool? isFlying;
  bool? motorsOn;
  String? flightMode;
  double? altitude; // m, relative to home
  double? latitude;
  double? longitude;
  double? homeLatitude;
  double? homeLongitude;
  double? homeDistance; // m, aircraft ↔ home
  double? horizontalSpeed; // m/s
  double? verticalSpeed; // m/s (up positive)
  double? heading; // deg
  int? flightTimeSeconds;
  double? goHomeHeight; // m

  // Phone's own GPS (independent of the drone's fix); streamed to the server as
  // a location fallback for the Web App's automatic bounding box.
  double? phoneLatitude;
  double? phoneLongitude;

  // ── Battery ─────────────────────────────────────────────────────────────────
  int? batteryPercent;
  double? batteryVoltage; // V
  double? batteryTemperature; // °C

  // ── Camera ──────────────────────────────────────────────────────────────────
  CaptureMode captureMode = CaptureMode.video;
  String? shootPhotoMode; // SINGLE / HDR / BURST / AEB / INTERVAL / PANORAMA
  bool isRecording = false;
  int recordSeconds = 0;
  bool sdInserted = false;
  int? sdRemainingMB;
  int? sdPhotoCount;
  int? sdVideoCount;

  // ── Exposure ────────────────────────────────────────────────────────────────
  ExposureProgram exposureProgram = ExposureProgram.auto;
  String? iso; // "100", "AUTO", …
  String? shutter; // "1/240"
  String? aperture; // "f/2.8"
  String? ev; // "-0.3"
  String? whiteBalance; // "5200K" / "AUTO"
  List<double>? histogram; // 0..1 normalized bins

  // ── Gimbal ──────────────────────────────────────────────────────────────────
  double? gimbalPitch; // deg (−90..30-ish)
  double? gimbalRoll;
  double? gimbalYaw;

  // ── Flight settings (Safety / Control) ──────────────────────────────────────
  int? maxHeight; // m
  int? maxRadius; // m
  bool? maxRadiusEnabled;
  int? rthHeight; // m
  String? obstacleAvoidance; // "On" / "Bypass" / "Off"
  bool? noviceMode;
  bool arHomePoint = true; // client-side toggle (AR overlay)

  // ── Missions ────────────────────────────────────────────────────────────────
  String missionState = 'idle'; // idle / ready / uploading / executing / …
  bool missionRunning = false;
  bool tracking = false; // ActiveTrack engaged
  String? missionError;

  // ── On-drone media ──────────────────────────────────────────────────────────
  List<MediaItem> media = <MediaItem>[];
  bool mediaLoading = false;

  // ── DJI account (optional, in addition to PilotVault) ───────────────────────
  String djiAccountState = 'unknown'; // notLoggedIn / tokenOutOfDate / authorized / …
  String? djiAccountUser;

  // ── Telemetry upload channel ────────────────────────────────────────────────
  UploadStatus upload = UploadStatus.disabled;

  bool get registered => registration == RegistrationState.success;

  /// Notify observers after a batch of field writes.
  void bump() => notifyListeners();
}