import 'dart:convert';
import 'dart:math';
import 'dart:typed_data';

class RecieveModel {
  // int UTC;
  // double LAT;
  // double LNG;
  // double ASL;
  // double speed;
  // int status;
  // num HDG;
  // num TP;
 int type;
  int TID;
  // num count;
  // String data;
  // num? mile;
  // int layer;
  // DecodeDataObj? obj;
  int x;
  int y;
  RecieveModel(
      {
      //   required this.ASL, //
      // required this.HDG, //
      // required this.LAT, //
      // required this.LNG, //
      required this.TID,
      // required this.TP,
      // required this.UTC,
      // required this.count,
      // required this.data,
      // required this.layer,
      // required this.mile,
      // required this.speed,
      // required this.status,
      required this.type,
      required this.x,
      required this.y,
      // this.obj
      });
  factory RecieveModel.fromJson(Map<dynamic, dynamic> json) {
    return RecieveModel(
        // ASL: json['ASL']!.toDouble(),
        // UTC: json['UTC'],
        type: int.tryParse(json['type'])??1,
        // TP: json['TP'],
        // count: json['count'],
        // data: json['data'],
        // HDG: json['HDG'],
        // LAT: json['LAT'],
        // layer: json['layer'],
        // LNG: json['LNG'],
        // mile: json['mile'],
        // speed: json['speed'],
        // status: json['status'],
        TID: json['TID'],
        // obj: json['obj'],
        x: json['x'] ?? 0,
        y: json['y'] ?? 0);
  }
}

class DecodeDataObj {
  int x;
  int y;
  Uint16List data;
  int dx;
  int dy;
  int w;
  int h;
  double rad;
  DecodeDataObj(
      {required this.data,
      required this.dx,
      required this.dy,
      required this.h,
      required this.w,
      required this.x,
      required this.y,
      required this.rad});
  factory DecodeDataObj.fromBase64(String base64) {
    // base64 解码
    Uint8List bytes = base64Decode(base64);
    ByteData byteData = bytes.buffer.asByteData();

    // 解码后解析为需要的格式返回出去
    int x = byteData.getInt32(0, Endian.little); //readInt32LE(str, 0);
    int y = byteData.getInt32(4, Endian.little); //readInt32LE(str, 4);
    int v = byteData.getUint16(8, Endian.little); //readUInt16LE(str, 8);
    int w = v & 0x3ff;
    double rad = (v >>> 10) * 2 * pi / 64;
    Uint16List data;
    int length = bytes.length;
    int h = 0;
    h -= 1;
    int dx;
    int dy;
    int i = 0;
    if (w < 16) {
      h = (length - 10 - 1);
      data = Uint16List(h * 2);
      for (i = 0; i < h; i++) {
        int x = bytes[10 + i] & 0x0f;
        int w = bytes[10 + i] >> 4;
        data[i * 2] = x;
        data[i * 2 + 1] = w;
      }
      dx = bytes[10 + i] & 0x0f;
      dy = bytes[10 + i] >> 4;
    } else if (w < 256) {
      h = ((length - 10) / 2 - 1).toInt();
      data = Uint16List(h * 2);
      for (i = 0; i < h; i++) {
        int x = bytes[10 + i * 2];
        int w = bytes[10 + i * 2 + 1];
        data[i * 2] = x;
        data[i * 2 + 1] = w;
      }
      dx = bytes[10 + i * 2];
      dy = bytes[10 + i * 2 + 1];
    } else {
      h = ((length - 10) / 3 - 1).toInt();
      data = Uint16List(h * 2);
      for (i = 0; i < h; i++) {
        if (10 + i * 3 + 3 < h) {
          int a = bytes[10 + i * 3];
          int b = bytes[10 + i * 3 + 1];
          int c = bytes[10 + i * 3 + 2];
          int x = a | (b & 0x0f) << 8;
          int w = (b & 0xf0) >> 4 | (c & 0x0f) << 4;
          data[i * 2] = x;
          data[i * 2 + 1] = w;
        }
      }
      int a = bytes[10 + i * 3];
      int b = bytes[10 + i * 3 + 1];
      int c = bytes[10 + i * 3 + 2];
      dx = a | (b & 0x0f) << 8;
      dy = (b & 0xf0) >> 4 | (c & 0x0f) << 4;
    }
    return DecodeDataObj(
        x: x, y: y, w: w, h: h, dx: dx, dy: dy, data: data, rad: rad);
  }
}