using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;

namespace Ips.Library.SigLoc
{
    public class WarSatFreq
    {
        public WarSatFreq() { }

        public WarSatFreq(long upFreq, long downFreq)
        {
            this.UpFreq = upFreq;
            this.DownFreq = downFreq;
        }

        public long UpFreq { get; set; }

        public long DownFreq { get; set; }

        static Dictionary<long, long> _freqCache = new Dictionary<long, long>();

        public static long GetDownFreq(long upFreq)
        {
            if (upFreq == 0) return 0;
            if (!_freqCache.ContainsKey(upFreq))
            {
                var freqItem = WarSatFreqData.ZsxSigList
                    .Select(m => new { AbsValue = Math.Abs(m.UpFreq - upFreq), m.UpFreq, m.DownFreq })
                    .OrderBy(m => m.AbsValue)
                    .FirstOrDefault();
                if (freqItem == null) return 0;
                var result = upFreq - (freqItem.UpFreq - freqItem.DownFreq);
                _freqCache.Add(upFreq, result);
            }
            return _freqCache[upFreq];
        }
    }

    public static class WarSatFreqData
    {
        public const string ZsxSigFreqListString = @"310.75,269.75
292.85,251.85
302.865,249.265
302.875,249.275
302.885,249.285
302.895,249.295
302.9,249.3
302.905,249.305
302.915,249.315
302.925,249.325
302.935,249.335
302.945,249.345
302.95,249.35
302.855,249.255
302.955,249.355
311.15,257.55
316.955,243.855
316.96,243.86
316.975,243.875
317,243.9
317.01,243.91
317.015,243.915
317.025,243.925
317.035,243.935
317.045,243.945
317.055,243.955
307.75,254.15
302.85,249.25
302.845,249.245
302.835,249.235
302.625,249.025
302.635,249.035
302.645,249.045
302.65,249.05
302.655,249.055
302.665,249.065
302.675,249.075
302.685,249.085
302.695,249.095
302.7,249.1
302.705,249.105
302.715,249.115
302.725,249.125
302.735,249.135
302.745,249.145
302.75,249.15
302.755,249.155
302.765,249.165
302.775,249.175
302.785,249.185
302.795,249.195
302.8,249.2
302.805,249.205
302.815,249.215
302.825,249.225
317.065,243.965
317.075,243.975
317.085,243.985
317.09,243.99
317.31,244.21
317.315,244.215
317.325,244.225
296.35,255.35
296.45,255.45
296.55,255.55
297.85,256.85
297.95,256.95
298.05,257.05
298.15,257.15
299.35,258.35
299.45,258.45
299.55,258.55
299.65,258.65
306.25,265.25
306.35,265.35
306.45,265.45
306.55,265.55
307.75,266.75
307.85,266.85
307.95,266.95
308.05,267.05
309.15,268.15
309.25,268.25
309.35,268.35
317.305,244.205
302.615,249.015
317.3,244.2
317.29,244.19
317.095,243.995
317.1,244
317.105,244.005
317.11,244.01
317.115,244.015
317.125,244.025
317.135,244.035
317.145,244.045
317.155,244.055
317.165,244.065
317.175,244.075
317.185,244.085
317.19,244.09
317.195,244.095
317.2,244.1
317.205,244.105
317.21,244.11
317.215,244.115
317.225,244.125
317.235,244.135
317.245,244.145
317.255,244.155
317.265,244.165
317.275,244.175
317.285,244.185
317.295,244.195
302.605,249.005
302.6,249
302.595,248.995
294.425,260.825
294.45,260.85
295.05,261.45
295.075,261.475
295.1,261.5
295.125,261.525
295.15,261.55
295.175,261.575
295.2,261.6
295.225,261.625
295.25,261.65
295.275,261.675
295.3,261.7
295.325,261.725
295.35,261.75
295.375,261.775
295.4,261.8
295.425,261.825
295.45,261.85
295.475,261.875
295.5,261.9
295.525,261.925
295.55,261.95
295.65,262.05
295.675,262.075
294.4,260.8
295.7,262.1
294.375,260.775
294.325,260.725
292.95,251.95
293.05,252.05
293.15,252.15
294.55,253.55
294.65,253.65
294.75,253.75
294.85,253.85
296.25,255.25
310.85,269.85
310.95,269.95
293.95,260.35
293.975,260.375
294,260.4
294.025,260.425
294.05,260.45
294.075,260.475
294.1,260.5
294.125,260.525
294.15,260.55
294.175,260.575
294.2,260.6
294.225,260.625
294.25,260.65
294.275,260.675
294.3,260.7
294.35,260.75
309.45,268.45
295.725,262.125
295.775,262.175
297.5,263.9
297.525,263.925
297.55,263.95
297.575,263.975
297.6,264
297.625,264.025
297.65,264.05
302.445,248.845
302.45,248.85
302.455,248.855
302.465,248.865
302.475,248.875
302.485,248.885
302.495,248.895
302.5,248.9
302.505,248.905
302.515,248.915
302.525,248.925
302.535,248.935
302.545,248.945
302.55,248.95
302.555,248.955
302.565,248.965
302.575,248.975
302.585,248.985
297.475,263.875
295.75,262.15
297.45,263.85
297.4,263.8
295.8,262.2
295.825,262.225
295.85,262.25
295.875,262.275
295.9,262.3
295.925,262.325
295.95,262.35
295.975,262.375
296,262.4
296.025,262.425
296.05,262.45
296.075,262.475
296.1,262.5
296.125,262.525
296.15,262.55
297.15,263.55
297.175,263.575
297.2,263.6
297.225,263.625
297.25,263.65
297.275,263.675
297.3,263.7
297.325,263.725
297.35,263.75
297.375,263.775
297.425,263.825
310.65,269.65";

        private static List<WarSatFreq> _zsxSigList;

        public static List<WarSatFreq> ZsxSigList
        {
            get
            {
                if (_zsxSigList == null)
                {
                    _zsxSigList = new List<WarSatFreq>();
                    using (var reader = new StringReader(ZsxSigFreqListString))
                    {
                        string line;
                        while ((line = reader.ReadLine()) != null)
                        {
                            var upDownFreqArr = line.Split(',');
                            if (upDownFreqArr.Length > 1)
                            {
                                var upfreq = decimal.Parse(upDownFreqArr[0]) * 1e6m;
                                var downfreq = decimal.Parse(upDownFreqArr[1]) * 1e6m;
                                var freqBssic = new WarSatFreq((long)upfreq, (long)downfreq);
                                _zsxSigList.Add(freqBssic);
                            }
                        }
                    }
                }
                return _zsxSigList;
            }
        }
    }
}