using AsbCloudDb.Model;
using AsbCloudInfrastructure.Services.DetectOperations.Detectors;
using Microsoft.Extensions.DependencyInjection;
using System;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;

namespace AsbCloudInfrastructure.Background.PeriodicWorks
{
    /// <summary>
    /// задача по добавлению данных в таблицу DataSaubStat, которая используется дл построения РТК-отчета
    /// </summary>
    internal class WorkDataSaubStat : Work
    {
        private int MechanicalDrillingCategoryId = 4001;

        public WorkDataSaubStat() : base("Generate DataSaubStat entries and save them into Db")
        {
            Timeout = TimeSpan.FromMinutes(10);
        }

        protected override Task Action(string id, IServiceProvider services, Action<string, double?> onProgressCallback, CancellationToken token)
        {
            //1 найти последнюю запись в кеш-таблице (по полям "Дата до")
            //2 определяем дату с которой начинаем анализ
            //3 находим автоопределнные операции по скважине, начиная с начальной даты из пункта 2
            //  3.1 только те, которые связанные с бурением (idParent = 4001)
            //  3.2 выбираем 500 операций
            //  3.3. выбираем минимальную дату начала и максимальную дату окончания
            //4 по полученным в пункте выше данным выбираем записи из telemetry_data_saub
            //  4.1.выбираем те у которых (bit_depth == well_depth)
            //5. для каждой операции из 3.2 находим соответствующий ей кусок телеметрии (по дате начала и окончания)
            //   и храним индексы этого куска в виде span
            //6. кусок телеметрии, полученный в пункте 5 (span) и соответствующая ей операция направляется на разбивку диапазонов

            //7/ разбивка диапазонов:  
            // параметры метода: массив из

            using var db = services.GetRequiredService<IAsbCloudDbContext>();
            var dateEnd = db.Set<DataSaubStat>()
                .OrderByDescending(c => c.DateEnd)
                .FirstOrDefault()?.DateEnd
                ?? DateTimeOffset.MinValue;

            var detectedOperations = db.Set<DetectedOperation>()
                .Where(o => o.DateStart > dateEnd)
                .Where(o => o.OperationCategory.IdParent == MechanicalDrillingCategoryId)
                .OrderBy(o => o.DateStart)
                .Take(500)
                .ToArray();

            var minDate = detectedOperations.FirstOrDefault()?.DateStart;
            var maxDate = detectedOperations.OrderByDescending(d => d.DateEnd).FirstOrDefault()?.DateEnd;

            var telemetryDataSaub = db.Set<TelemetryDataSaub>()
                .Where(t => t.DateTime >= minDate)
                .Where(t => t.DateTime <= maxDate)
                .Where(t => Math.Abs(t.BitDepth - t.WellDepth) < 0.0001)
                .OrderBy(t => t.DateTime)
                .ToArray();

            var indexStart = 0;
            var indexEnd = 0;
            foreach (var operation in detectedOperations)
            {
                indexStart = Array.FindIndex(telemetryDataSaub, indexEnd, t => t.DateTime >= operation.DateStart);
                indexEnd = Array.FindIndex(telemetryDataSaub, indexStart, t => t.DateTime > operation.DateEnd) - 1;

                if (indexStart >= 0 && indexEnd >= indexStart)
                {
                    var length = indexEnd - indexStart;

                    var subset = telemetryDataSaub.AsSpan(indexStart, length + 1);
                    var result = CalcStats(operation, subset, db);
                }
            }

            return Task.CompletedTask;
        }

        private int CalcStats(DetectedOperation operation, Span<TelemetryDataSaub> telemetryDataSaub, IAsbCloudDbContext db)
        {
            var indexStart = 0;
            for (var i = 1; i < telemetryDataSaub.Length; i++)
            {
                var previous = telemetryDataSaub[i - 1];
                var current = telemetryDataSaub[i];

                if (IsNewCacheItem(previous, current) || i == telemetryDataSaub.Length - 1)
                {
                    var length = i - indexStart;
                    var span = telemetryDataSaub.Slice(indexStart, length);
                    indexStart = i;
                    var dataSaubStatItem = CalcStat(operation, span);
                    db.Set<DataSaubStat>().Add(dataSaubStatItem);
                }
            }
            return db.SaveChanges();
        }

        private DataSaubStat CalcStat(DetectedOperation operation, Span<TelemetryDataSaub> span)
        {
            var hasOscillation = operation.ExtraData.TryGetValue(DetectorDrilling.ExtraDataKeyHasOscillation, out object? hasOscillationObject)
                && hasOscillationObject is true;

            var wavg = CalcWavg(span);
            var processMapDrillingCacheItem = new DataSaubStat
            {
                DateStart = operation.DateStart,
                DateEnd = operation.DateEnd,
                DepthStart = operation.DepthStart,
                DepthEnd = operation.DepthEnd,
                Speed = (operation.DepthEnd - operation.DepthStart) / ((operation.DateEnd - operation.DateStart).TotalHours),
                BlockSpeedSp = span[0].BlockSpeedSp,
                Pressure = wavg.Pressure,
                PressureIdle = span[0].PressureIdle,
                PressureSp = span[0].PressureSp,
                AxialLoad = wavg.AxialLoad,
                AxialLoadSp = span[0].AxialLoadSp,
                AxialLoadLimitMax = span[0].AxialLoadLimitMax,
                RotorTorque = wavg.RotorTorque,
                RotorTorqueSp = span[0].RotorTorqueSp,
                RotorTorqueLimitMax = span[0].RotorTorqueLimitMax,
                IdFeedRegulator = span[0].IdFeedRegulator,
                RotorSpeed = wavg.RotorSpeed,
                DetectedOperationCategoryId = operation.IdCategory,
                EnabledSubsystems = operation.EnabledSubsystems,
                HasOscillation = hasOscillation,
                IdTelemetry = operation.IdTelemetry,
                Flow = wavg.Flow
            };
            return processMapDrillingCacheItem;
        }

        private (
            double Pressure,
            double AxialLoad,
            double RotorTorque,
            double RotorSpeed,
            double Flow
            ) CalcWavg(Span<TelemetryDataSaub> span)
        {
            var sumPressure = 0.0;
            var sumAxialLoad = 0.0;
            var sumRotorTorque = 0.0;
            var sumRotorSpeed = 0.0;
            var flow = span[0].Flow ?? 0.0;
            var diffDepthTotal = span[^1].WellDepth - span[0].WellDepth;
            for (var i = 0; i < span.Length - 1; i++)
            {
                var weigth = span[i + 1].WellDepth - span[i].WellDepth;
                sumPressure += weigth * span[i].Pressure;
                sumAxialLoad += weigth * span[i].AxialLoad;
                sumRotorTorque += weigth * span[i].RotorTorque;
                sumRotorSpeed += weigth * span[i].RotorSpeed;
                flow = span[i + 1].Flow > flow ? span[i + 1].Flow ?? 0.0 :flow;
            }
            return (
                Pressure: sumPressure / diffDepthTotal,
                AxialLoad: sumAxialLoad / diffDepthTotal,
                RotorTorque: sumRotorTorque / diffDepthTotal,
                RotorSpeed: sumRotorSpeed / diffDepthTotal,
                Flow: flow
            );
        }

        private bool IsNewCacheItem(TelemetryDataSaub previous, TelemetryDataSaub current)
        {
            return !(current.Mode == previous.Mode)
                 || !(current.BlockSpeedSp == previous.BlockSpeedSp)
                 || !(current.PressureIdle == previous.PressureIdle)
                 || !(current.PressureSp == previous.PressureSp)
                 || !(current.AxialLoadSp == previous.AxialLoadSp)
                 || !(current.AxialLoadLimitMax == previous.AxialLoadLimitMax)
                 || !(current.HookWeightIdle == previous.HookWeightIdle)
                 || !(current.RotorTorqueIdle == previous.RotorTorqueIdle)
                 || !(current.RotorTorqueSp == previous.RotorTorqueSp)
                 || !(current.RotorTorqueLimitMax == previous.RotorTorqueLimitMax)
                 || !(current.IdFeedRegulator == previous.IdFeedRegulator);
        }
    }
}