import 'package:flutter/foundation.dart';

import 'parse.dart';

/// Radio links and the remote controller's battery. Fed from the `links` and
/// `rc` groups of the telemetry tick (≤2 Hz).
class LinkState extends ChangeNotifier {
  /// `ocusync` / `lightbridge` / `wifi` as the air link reports it at runtime.
  String? kind;

  /// RC → aircraft control-link quality, 0–100.
  int? uplinkQuality;

  /// Aircraft → RC video-link quality, 0–100.
  int? downlinkQuality;

  int? rcBatteryPercent;
  int? rcBatteryMah;
  bool? rcCharging;

  /// `RCMode` name on dual-operator remotes: `MASTER` / `SLAVE` / `NORMAL` …
  String? rcMode;
  bool? masterSlaveConnected;

  /// "M" / "S" for the HUD's dual-operator badge, null when flying solo.
  String? get rcRoleBadge => switch (rcMode) {
        'MASTER' || 'MASTER_SUB' => 'M',
        'SLAVE' || 'SLAVE_SUB' => 'S',
        _ => null,
      };

  DateTime? updatedAt;

  /// 0–5 bars, the way the top bar draws a 0–100 quality.
  static int bars(int? quality) => quality == null ? 0 : ((quality.clamp(0, 100) + 19) ~/ 20);

  void apply({Map<String, dynamic>? links, Map<String, dynamic>? rc}) {
    kind = asString(links?['kind']);
    uplinkQuality = asInt(links?['uplinkQuality']);
    downlinkQuality = asInt(links?['downlinkQuality']);
    rcBatteryPercent = asInt(rc?['batteryPercent']);
    rcBatteryMah = asInt(rc?['batteryMah']);
    rcCharging = asBool(rc?['isCharging']);
    rcMode = asString(rc?['mode']);
    masterSlaveConnected = asBool(rc?['masterSlaveConnected']);
    updatedAt = DateTime.now();
    notifyListeners();
  }

  void clear() {
    kind = rcMode = null;
    uplinkQuality = downlinkQuality = rcBatteryPercent = rcBatteryMah = null;
    rcCharging = masterSlaveConnected = null;
    updatedAt = null;
    notifyListeners();
  }
}