using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;

namespace XdCxRhDW.App.Api.GDOP误差椭圆
{
    public static class GdopHelper
    {

        private const string GDOPDll = @"Api\GDOP误差椭圆\GDOP\GDOP_Draw.dll";

        static readonly DateTime dtZero = new DateTime(1970, 1, 1, 8, 0, 0, 0);
        /// <returns></returns>
        
        [DllImport(GDOPDll, CallingConvention = CallingConvention.Cdecl)]
        public static extern int Gdop2Sat1DRef(string mainLines, string adajLines, Int64 captime, double[] cdbPos
        , double[] refPos, double dtousErr, double ephLocErr
        , double[] level, int levlen, int[] resCount, out IntPtr res, double[] satllh);

        [DllImport(GDOPDll, CallingConvention = CallingConvention.Cdecl)]
        public static extern void FreeGDOPBuf(IntPtr val);

       

        public static (List<SatInfo>, List<ErrDistanceMapPoints>) Gdop2Sat1DRef(string mainLines, string adajLines, DateTime captime, double[] cdbPos, double[] refPos, double dtousErr, double ephLocErr)
        {
            int satCount = 2;
            //该值和points 一一对应
            double[] level = GdopParam.误差配置.误差距离m;
            double[] satllh = new double[satCount * 3];

            var timeSpan = (long)(captime - dtZero).TotalSeconds;
            IntPtr res = IntPtr.Zero;
            int[] resCount = new int[level.Length];
            Gdop2Sat1DRef(mainLines, adajLines, timeSpan, cdbPos, refPos, dtousErr, ephLocErr, level, level.Length, resCount, out res, satllh);

            IntPtr tmp = res;

            //用于绘制的数据
            List<double[]> points = new List<double[]>();
            for (int idx = 0; idx < level.Length; ++idx)
            {
                double[] levelval = new double[resCount[idx]];
                Marshal.Copy(tmp, levelval, 0, resCount[idx]);
                tmp += (resCount[idx] * sizeof(double));
                points.Add(levelval);
            }
            FreeGDOPBuf(res);
            List<SatInfo> satInfos = ParseResult(satCount, satllh, mainLines, adajLines);
            List<ErrDistanceMapPoints> errs = new List<ErrDistanceMapPoints>();
            for (int i = 0; i < points.Count; i++)
            {
                if (!points[i].Any()) continue;
                ErrDistanceMapPoints errDistanceMap = new ErrDistanceMapPoints();
                errDistanceMap.ErrDistance = level[i];
                errDistanceMap.MapDots.AddRange(ParseResult(points[i]));
                errs.Add(errDistanceMap);
            }
            return (satInfos, errs);
        }


        private static List<MapDot> ParseResult(double[] ponits)
        {
            List<MapDot> mapDots = new List<MapDot>();
            int count = 2;
            for (int i = 0; i < ponits.Length / count; i++)
            {
                MapDot mapDot = new MapDot();
                mapDot.Lat = ponits[count * i + 1];
                mapDot.Lon = ponits[count * i];
                mapDots.Add(mapDot);
               
            }
            return mapDots;

        }


        private static List<SatInfo> ParseResult(int satCount, double[] satllh, params string[] ephLine)
        {

            List<SatInfo> list = new List<SatInfo>();
            int len = 3;
            for (int i = 0; i < satCount; i++)
            {
                SatInfo satInfo = new SatInfo();
                var ephstrs = ephLine[i].Split(new string[] { " ", "U" }, StringSplitOptions.RemoveEmptyEntries);
                if (ephstrs.Length == 16)
                {
                    satInfo.SatCode = Convert.ToInt32(ephstrs[1]);
                }
                satInfo.SatLon = Convert.ToDouble(satllh[len * i]);
                satInfo.SatLat = Convert.ToDouble(satllh[len * i + 1]);
                list.Add(satInfo);
            }

            return list;
        }
    }

}