import 'package:flutter/foundation.dart';

import 'parse.dart';
import 'settings_overlay.dart';

/// The camera's storage (SD card, or internal storage on cameras that have it).
@immutable
class StorageInfo {
  const StorageInfo({
    this.location,
    this.inserted = false,
    this.initializing = false,
    this.formatting = false,
    this.formatted = false,
    this.full = false,
    this.error = false,
    this.readOnly = false,
    this.invalidFormat = false,
    this.verified = false,
    this.totalMB,
    this.remainingMB,
    this.availableCaptureCount,
    this.availableRecordingSeconds,
  });

  factory StorageInfo.fromMap(Map<String, dynamic> m) => StorageInfo(
        location: asString(m['location']),
        inserted: asBool(m['inserted']) ?? false,
        initializing: asBool(m['initializing']) ?? false,
        formatting: asBool(m['formatting']) ?? false,
        formatted: asBool(m['formatted']) ?? false,
        full: asBool(m['full']) ?? false,
        error: asBool(m['error']) ?? false,
        readOnly: asBool(m['readOnly']) ?? false,
        invalidFormat: asBool(m['invalidFormat']) ?? false,
        verified: asBool(m['verified']) ?? false,
        totalMB: asInt(m['totalMB']),
        remainingMB: asInt(m['remainingMB']),
        availableCaptureCount: asInt(m['availableCaptureCount']),
        availableRecordingSeconds: asInt(m['availableRecordingSeconds']),
      );

  final String? location; // SDCARD / INTERNAL_STORAGE
  final bool inserted;
  final bool initializing;
  final bool formatting;
  final bool formatted;
  final bool full;
  final bool error;
  final bool readOnly;
  final bool invalidFormat;
  final bool verified;
  final int? totalMB;
  final int? remainingMB;
  final int? availableCaptureCount;
  final int? availableRecordingSeconds;

  /// One word for the HUD's storage chip, worst condition first.
  String get status {
    if (!inserted) return 'No SD';
    if (error) return 'SD error';
    if (invalidFormat) return 'Format SD';
    if (formatting) return 'Formatting';
    if (initializing) return 'Initializing';
    if (full) return 'SD full';
    if (readOnly) return 'Read-only';
    return 'OK';
  }

  bool get usable => inserted && !error && !invalidFormat && !formatting && !initializing && !full;
}

/// The SSD on cameras that record to one (X5S / X7 on Inspire 2).
@immutable
class SsdInfo {
  const SsdInfo({this.connected = false, this.state, this.capacity, this.remainingMB, this.availableRecordingSeconds});

  factory SsdInfo.fromMap(Map<String, dynamic> m) => SsdInfo(
        connected: asBool(m['connected']) ?? false,
        state: asString(m['state']),
        capacity: asString(m['capacity']),
        remainingMB: asInt(m['remainingMB']),
        availableRecordingSeconds: asInt(m['availableRecordingSeconds']),
      );

  final bool connected;

  /// `SSDOperationState`: `NOT_FOUND` / `IDLE` / `SAVING` / `FORMATTING` /
  /// `INITIALIZING` / `ERROR` / `FULL` / `POOR_CONNECTION` …
  final String? state;
  final String? capacity; // CAPACITY_512_GB …
  final int? remainingMB;
  final int? availableRecordingSeconds;

  /// One word for the HUD's SSD chip, like [StorageInfo.status].
  String get status {
    if (!connected || state == 'NOT_FOUND') return 'No SSD';
    return switch (state) {
      'ERROR' => 'SSD error',
      'FULL' => 'SSD full',
      'FORMATTING' => 'Formatting',
      'INITIALIZING' => 'Initializing',
      'POOR_CONNECTION' => 'SSD loose',
      _ => 'OK',
    };
  }

  bool get usable => status == 'OK';
}

/// Optical / hybrid zoom state. Focal lengths are in the camera's own units
/// (tenths of a millimetre on the Mavic 2 Zoom); [factor] is relative to [min].
@immutable
class ZoomInfo {
  const ZoomInfo({required this.focalLength, required this.min, required this.max, this.opticalMax, this.step});

  static ZoomInfo? fromSettings(Map<String, dynamic> m) {
    final int? f = asInt(m['zoomFocalLength']), lo = asInt(m['zoomMin']), hi = asInt(m['zoomMax']);
    if (f == null || lo == null || hi == null || lo <= 0 || hi <= lo) return null;
    return ZoomInfo(focalLength: f, min: lo, max: hi, opticalMax: asInt(m['zoomOpticalMax']), step: asInt(m['zoomStep']));
  }

  final int focalLength;
  final int min;
  final int max;
  final int? opticalMax;
  final int? step;

  double get factor => focalLength / min;
  double get maxFactor => max / min;

  /// Past the optical range on a hybrid camera (the image is cropped).
  bool get digital => opticalMax != null && focalLength > opticalMax!;

  /// The next focal length one T / W press lands on: an eighth of the range,
  /// snapped to the camera's step.
  int stepped(bool zoomIn) {
    final int s = (step ?? 1) <= 0 ? 1 : step!;
    final int raw = ((max - min) / 8).round();
    final int delta = raw < s ? s : (raw ~/ s) * s;
    return (focalLength + (zoomIn ? delta : -delta)).clamp(min, max);
  }
}

/// Camera state from the bridge: recording, exposure read-back, storage and
/// the watched camera settings. Recording and exposure arrive as their own
/// `camera` / `exposure` events; storage and settings as the `storage` and
/// `cameraSettings` groups of the telemetry tick (≤2 Hz).
class CameraState extends ChangeNotifier with SettingsOverlay {
  bool isRecording = false;
  int recordSeconds = 0;

  // Shooting flags from the system state.
  bool shootingSingle = false;
  bool shootingInterval = false;
  bool shootingBurst = false;
  bool shootingPanorama = false;
  int panoramaProgress = 0; // 0..100
  bool storingPhoto = false;
  bool overheating = false;
  bool hasError = false;

  /// Any multi-shot capture the shutter button should stop rather than start.
  bool get shootingContinuous => shootingInterval || shootingPanorama || shootingBurst;

  /// `SHOOT_PHOTO` / `RECORD_VIDEO` / `PLAYBACK` / `MEDIA_DOWNLOAD`.
  String? mode;

  // Exposure read-back, in the same labels the setters accept.
  String? iso; // "100", "AUTO", …
  String? shutter; // "1/240"
  String? aperture; // "f/2.8"
  String? ev; // "-0.3"

  StorageInfo? storage;

  /// Only on cameras with an SSD slot; null elsewhere.
  SsdInfo? ssd;

  /// Spot-meter temperature in °C, only from thermal cameras.
  double? thermalSpot;

  // The watched settings, as the HUD shows them (pending writes included).
  bool? get aeLock => asBool(settings['aeLock']);
  String? get focusMode => asString(settings['focusMode']); // MANUAL / AUTO / AFC
  String? get photoAspectRatio => asString(settings['photoAspectRatio']); // RATIO_4_3 / RATIO_16_9 / RATIO_3_2
  String? get photoFileFormat => asString(settings['photoFileFormat']); // JPEG / RAW / RAW_AND_JPEG
  String? get videoResolution => asString(settings['videoResolution']); // RESOLUTION_3840x2160 …
  String? get videoFrameRate => asString(settings['videoFrameRate']); // FRAME_RATE_29_DOT_970_FPS …
  String? get videoFileFormat => asString(settings['videoFileFormat']); // MOV / MP4
  String? get colorProfile => asString(settings['colorProfile']); // NONE / D_LOG / …

  // [settings] ([SettingsOverlay]) is the whole `cameraSettings` group —
  // every id of `CameraBridge.kt`'s settings table plus the composite values —
  // overlaid with the camera menu's pending writes. The menu's rows read it
  // through [setting].

  /// `PROGRAM` / `SHUTTER_PRIORITY` / `APERTURE_PRIORITY` / `MANUAL`.
  String? get exposureMode => asString(settings['exposureMode']);

  /// The ISO setting (`AUTO` included); [iso] is what the camera is using now.
  String? get isoSetting => asString(settings['isoSetting']);
  String? get whiteBalancePreset => asString(settings['whiteBalancePreset']);
  int? get whiteBalanceKelvin => asInt(settings['whiteBalanceKelvin']);
  String? get shootPhotoMode => asString(settings['shootPhotoMode']);
  String? get meteringMode => asString(settings['meteringMode']);
  int? get intervalSeconds => asInt(settings['intervalSeconds']);
  int? get intervalCount => asInt(settings['intervalCount']);
  bool get histogramEnabled => asBool(settings['histogramEnabled']) ?? false;

  /// Zoom, in the camera's own focal-length units; null on cameras without it.
  ZoomInfo? get zoom => ZoomInfo.fromSettings(settings);

  /// Luminance histogram bins while [histogramEnabled]; a separate notifier
  /// because frames arrive at 4 Hz and only the histogram widget redraws.
  final ValueNotifier<List<int>?> histogram = ValueNotifier<List<int>?>(null);

  DateTime? updatedAt;

  void applySystem(Map<String, dynamic> e) {
    isRecording = asBool(e['isRecording']) ?? false;
    recordSeconds = asInt(e['recordingTimeSeconds']) ?? recordSeconds;
    mode = asString(e['mode']) ?? mode;
    shootingSingle = asBool(e['shootingSingle']) ?? false;
    shootingInterval = asBool(e['shootingInterval']) ?? false;
    shootingBurst = asBool(e['shootingBurst']) ?? false;
    shootingPanorama = asBool(e['shootingPanorama']) ?? false;
    panoramaProgress = asInt(e['panoramaProgress']) ?? 0;
    storingPhoto = asBool(e['storingPhoto']) ?? false;
    overheating = asBool(e['overheating']) ?? false;
    hasError = asBool(e['hasError']) ?? false;
    notifyListeners();
  }

  void applyHistogram(Map<String, dynamic> e) {
    final Object? bins = e['bins'];
    histogram.value = bins is List ? <int>[for (final Object? b in bins) asInt(b) ?? 0] : null;
  }

  /// Sets [mode] ahead of the camera's own `camera` event, so the HUD follows
  /// the photo / video switch at once.
  void setModeOptimistic(String mode) {
    if (this.mode == mode) return;
    this.mode = mode;
    notifyListeners();
  }

  bool get isVideoMode => mode == 'RECORD_VIDEO';

  void applyExposure(Map<String, dynamic> e) {
    iso = asString(e['iso']);
    shutter = asString(e['shutter']);
    aperture = asString(e['aperture']);
    ev = asString(e['ev']);
    notifyListeners();
  }

  /// From the telemetry tick; an absent group means the camera never reported it.
  void applyTelemetry({
    Map<String, dynamic>? storage,
    Map<String, dynamic>? ssd,
    Map<String, dynamic>? thermal,
    Map<String, dynamic>? settings,
  }) {
    this.storage = storage == null ? null : StorageInfo.fromMap(storage);
    this.ssd = ssd == null ? null : SsdInfo.fromMap(ssd);
    thermalSpot = finite(thermal?['spotTemperature']);
    replaceReported(settings ?? const <String, dynamic>{});
    updatedAt = DateTime.now();
    notifyListeners();
  }

  void clear() {
    isRecording = false;
    recordSeconds = 0;
    shootingSingle = shootingInterval = shootingBurst = shootingPanorama = false;
    panoramaProgress = 0;
    storingPhoto = overheating = hasError = false;
    clearSettings();
    histogram.value = null;
    mode = iso = shutter = aperture = ev = null;
    storage = null;
    ssd = null;
    thermalSpot = null;
    updatedAt = null;
    notifyListeners();
  }
}