using AsbCloudApp.Data;
using AsbCloudApp.Data.SAUB;
using AsbCloudApp.Repositories;
using AsbCloudApp.Requests;
using AsbCloudApp.Services;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;

namespace AsbCloudInfrastructure.Services;


public class DataSaubStatDrillingQualityService : IDataSaubStatDrillingQualityService
{
    private IDataSaubStatRepository<DataSaubStatDrillingQualityDto> dataSaubStatDrillingQualityRepository;
    private ITelemetryDataSaubService dataSaubService;
    private ITelemetryDataCache<TelemetryDataSaubDto> telemetryDataCache;

    public Dictionary<int, Predicate<TelemetryDataSaubDto>> QualitySettingsForFeedRegulators { get; }

    public DataSaubStatDrillingQualityService(
        IDataSaubStatRepository<DataSaubStatDrillingQualityDto> dataSaubStatDrillingQualityRepository,
        ITelemetryDataCache<TelemetryDataSaubDto> telemetryDataCache,
        ITelemetryDataSaubService dataSaubService)
    {
        this.dataSaubStatDrillingQualityRepository = dataSaubStatDrillingQualityRepository;
        this.dataSaubService = dataSaubService;
        this.telemetryDataCache = telemetryDataCache;

        Predicate<TelemetryDataSaubDto> hasQualityWithIdFeedRegulator1 = (TelemetryDataSaubDto spanItem)
           => (spanItem.BlockSpeed >= spanItem.BlockSpeedSp * 0.95
                && spanItem.BlockSpeed <= spanItem.BlockSpeedSp * 1.05);

        Predicate<TelemetryDataSaubDto> hasQualityWithIdFeedRegulator2 = (TelemetryDataSaubDto spanItem)
           => (spanItem.Pressure >= (spanItem.PressureSp - spanItem.PressureIdle) - 5
                && spanItem.Pressure <= (spanItem.PressureSp - spanItem.PressureIdle) + 5);

        Predicate<TelemetryDataSaubDto> hasQualityWithIdFeedRegulator3 = (TelemetryDataSaubDto spanItem)
           => (spanItem.AxialLoad >= (spanItem.AxialLoadSp - 0.5)
                && spanItem.AxialLoad <= (spanItem.AxialLoadSp + 0.5));

        Predicate<TelemetryDataSaubDto> hasQualityWithIdFeedRegulator4 = (TelemetryDataSaubDto spanItem)
          => (spanItem.RotorTorque >= (spanItem.RotorTorqueSp - 0.5)
                && spanItem.RotorTorque <= (spanItem.RotorTorqueSp + 0.5));

        QualitySettingsForFeedRegulators = new Dictionary<int, Predicate<TelemetryDataSaubDto>>() {
            { 1, hasQualityWithIdFeedRegulator1 },
            { 2, hasQualityWithIdFeedRegulator2 },
            { 3, hasQualityWithIdFeedRegulator3 },
            { 4, hasQualityWithIdFeedRegulator4 },
        };
    }

    public async Task CreateStatAsync(int lastDaysFilter, Action<string, double?> onProgressCallback, CancellationToken token)
    {
        var cacheRequest = new TelemetryDataRequest()
        {
            GeDate = DateTime.UtcNow.AddDays(-lastDaysFilter)
        };
        var idTelemetries = telemetryDataCache.GetIds(cacheRequest).ToArray();

        if (!idTelemetries.Any())
            return;

        var stats = await dataSaubStatDrillingQualityRepository.GetLastsAsync(idTelemetries, token);

        for (var i = 0; i < idTelemetries.Length; i++)
        {
            var idTelemetry = idTelemetries[i];
            var lastDate = stats.FirstOrDefault(s => s.IdTelemetry == idTelemetry)?.DateEnd.ToUniversalTime() ?? DateTimeOffset.UnixEpoch;
            var statsCount = await CreateStatDrillingQualityForTelemetry(idTelemetry, lastDate, token);
            if (onProgressCallback != null)
                onProgressCallback($"Calculate stat for telemetry: {idTelemetry}; from {lastDate}; results count: {statsCount};", 1d * i / idTelemetries.Length);
        }
    }

    private async Task<int> CreateStatDrillingQualityForTelemetry(
        int idTelemetry,
        DateTimeOffset geDate,
        CancellationToken token)
    {
        var leDate = DateTimeOffset.UtcNow;

        var dataSaub = await dataSaubService.Get(idTelemetry, true, geDate, leDate, 100_000, token);

        if (!dataSaub.Any())
            return 0;

        if (dataSaub is not TelemetryDataSaubDto[] dataSaubArray)
            dataSaubArray = dataSaub.ToArray();

        var result = new List<DataSaubStatDrillingQualityDto>();
        foreach (var item in QualitySettingsForFeedRegulators)
        {
            var data = CreateDataSaubStatDrillingQuality(item.Key, item.Value, dataSaubArray);
            result.AddRange(data);
        }

        if (result.Any())
            return await dataSaubStatDrillingQualityRepository.InsertRangeAsync(result, token);

        return 0;
    }

    private static IEnumerable<DataSaubStatDrillingQualityDto> CreateDataSaubStatDrillingQuality(
        int idFeedRegulator,
        Predicate<TelemetryDataSaubDto> checkQuality,
        TelemetryDataSaubDto[] dataSaub)
    {
        var result = new List<DataSaubStatDrillingQualityDto>();

        var indexStart = 0;
        var indexEnd = 0;

        while (indexEnd < dataSaub.Count() - 1)
        {
            indexStart = Array.FindIndex(dataSaub, indexEnd, t => t.IdFeedRegulator == idFeedRegulator);
            if (indexStart < 0)
                break;

            indexEnd = indexStart + 1;
            for (var i = indexStart + 1; i < dataSaub.Count(); i++)
            {
                if (dataSaub[i].WellDepth >= dataSaub[i - 1].WellDepth)
                    indexEnd = i;
                else if (dataSaub[i].IdFeedRegulator != idFeedRegulator)
                    break;
                else
                    break;
                    
            }

            if (indexEnd < 0)
                indexEnd = dataSaub.Length - 1;

            if (indexEnd == indexStart)
                continue;

            var length = indexEnd - indexStart + 1;

            var subset = dataSaub.AsSpan(indexStart, length);

            if (length <= 2 || (subset[^1].WellDepth - subset[0].WellDepth) < 0.15)
                continue; // мелкие выборки не учитываем.


            var stats = CalcStatsDrillingQuality(idFeedRegulator, subset, checkQuality);
            result.Add(stats);

        }
        return result;
    }

    private static DataSaubStatDrillingQualityDto CalcStatsDrillingQuality(
        int idFeedRegulator,
        Span<TelemetryDataSaubDto> dataSaub,
        Predicate<TelemetryDataSaubDto> predicate
        )
    {
        var result = new DataSaubStatDrillingQualityDto();
        result.IdTelemetry = dataSaub[0].IdTelemetry;
        result.IdFeedRegulator = idFeedRegulator;
        result.DepthStart = dataSaub[0].WellDepth;
        result.DepthEnd = dataSaub[^1].WellDepth;
        result.DateStart = dataSaub[0].DateTime;
        result.DateEnd = dataSaub[^1].DateTime;

        var depthDrillingQuality = 0.0;
        for (var i = 0; i < dataSaub.Length - 1; i++)
        {
            if (predicate(dataSaub[i]))
            {
                depthDrillingQuality += dataSaub[i + 1].WellDepth - dataSaub[i].WellDepth;
            }
        }
        result.DepthDrillingQuality = depthDrillingQuality;

        return result;
    }
}