public struct Longlatitude
{
    public double Longitude;
    public double latitude;
}

public class GPSManager
{
    private const double EARTH_RADIUS = 6378137;  
    private static bool bStart=false;
    private static Dictionary<ushort, Longlatitude> dic = new Dictionary<ushort, Longlatitude>();
    public static Action eventGPS;
   // public static Dictionary<ushort, double> distance = new Dictionary<ushort, double>();//key为0代表0距离1  key为2代表2距离0
    public static IEnumerator StartGPS(Action<LocationInfo> CallBack)        //初始GPS  获取位置
    {
        if (bStart)
        {
            yield break;
        }
        bStart = true;
        // 检查位置服务是否可用  
        if (!Input.location.isEnabledByUser)
        {
            Debug.LogError("服务不可用");
            bStart = false;
            yield break;
        }

        // 查询位置之前先开启位置服务  
        Input.location.Start();

        // 等待服务初始化  
        int maxWait = 20;
        while (Input.location.status == LocationServiceStatus.Initializing && maxWait > 0)
        {
            yield return new WaitForSeconds(1);
            maxWait--;
        }

        // 服务初始化超时  
        if (maxWait < 1)
        {
            Debug.LogError("服务初始化超时");
            bStart = false;
            yield break;
        }

        // 连接失败  
        if (Input.location.status == LocationServiceStatus.Failed)
        {
            Debug.LogError("连接失败");
            bStart = false;
            yield break;
        }
        else
        {
            CallBack(Input.location.lastData);
            //string str = "Location: rn" +
            //"纬度：" + Input.location.lastData.latitude + "rn" +
            //"经度：" + Input.location.lastData.longitude + "rn" +
            //"海拔：" + Input.location.lastData.altitude + "rn" +
            //"水平精度：" + Input.location.lastData.horizontalAccuracy + "rn" +
            //"垂直精度：" + Input.location.lastData.verticalAccuracy + "rn" +
            //"时间戳：" + Input.location.lastData.timestamp;
        }

        // 停止服务，如果没必要继续更新位置，（为了省电）  
        Input.location.Stop();
        bStart = false;
    }

    /// <summary>
    /// 计算两点位置的距离，返回两点的距离，单位 米
    /// 该公式为GOOGLE提供，误差小于0.2米
    /// </summary>
    /// <param name="lat1">第一点纬度</param>
    /// <param name="lng1">第一点经度</param>
    /// <param name="lat2">第二点纬度</param>
    /// <param name="lng2">第二点经度</param>
    /// <returns></returns>
    public static double GetDistance(double lat1, double lng1, double lat2, double lng2)  //第一玩家纬度，第一玩家经度，第二玩家纬度，第二玩家经度，     //获取两个玩家的距离
    {
        double radLat1 = Rad(lat1);
        double radLng1 = Rad(lng1);
        double radLat2 = Rad(lat2);
        double radLng2 = Rad(lng2);
        double a = radLat1 - radLat2;
        double b = radLng1 - radLng2;
        double result = 2 * System.Math.Asin(System.Math.Sqrt(System.Math.Pow(System.Math.Sin(a / 2), 2) + System.Math.Cos(radLat1) * System.Math.Cos(radLat2) * System.Math.Pow(System.Math.Sin(b / 2), 2))) * EARTH_RADIUS;
        return result;
    }



    /// <summary>
    /// 经纬度转化成弧度
    /// </summary>
    /// <param name="d"></param>
    /// <returns></returns>
    private static double Rad(double d)
    {
        return (double)d * System.Math.PI / 180d;
    }

    public static bool GetGPSDistance(ushort chairID_1,ushort chairID_2, out double dis)  //第一个玩家，第二个玩家
    {
        dis = 0;
        if (dic.ContainsKey(chairID_1)&& dic.ContainsKey(chairID_2))
        {
            dis = GetDistance(dic[chairID_1].latitude, dic[chairID_1].Longitude, dic[chairID_2].latitude, dic[chairID_2].Longitude);
            return true;
        }
        else
        {
            return false;
        }
    }

    public static void AddGPSInfo(ushort chairID,double Longitude, double latitude)  //保存每个玩家的ID和经纬度
    {
        Longlatitude data = new Longlatitude();
        data.Longitude = Longitude;
        data.latitude = latitude;
        if (dic.ContainsKey(chairID))
        {
            dic[chairID] = data;
        }
        else
        {
            dic.Add(chairID, data);
        }
        if (eventGPS != null)
        {
            eventGPS();
        }
    }
    public static void RemoveAt(ushort chairID)  //移除玩家
    {
        if (dic.ContainsKey(chairID))
        {
            dic.Remove(chairID);
        }
    }
    public static void RemoveAll()       //移除所有玩家
    {
        dic.Clear();
    }
}