using AsbCloudApp.Data;
using AsbCloudApp.Data.ProcessMap;
using AsbCloudApp.Data.SAUB;
using AsbCloudApp.Repositories;
using AsbCloudApp.Requests;
using AsbCloudApp.Services;
using AsbCloudDb.Model;
using Microsoft.EntityFrameworkCore;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;

namespace AsbCloudInfrastructure.Services.ProcessMap
{
#nullable enable
    public partial class ProcessMapService : IProcessMapService
    {
        private readonly IAsbCloudDbContext db;
        private readonly IWellOperationRepository wellOperationRepository;
        private readonly IProcessMapRepository processMapRepository;
        private readonly ITelemetryService telemetryService;

        public ProcessMapService(
            IAsbCloudDbContext db,
            IWellOperationRepository wellOperationService,
            IProcessMapRepository processMapRepository,
            ITelemetryService telemetryService)
        {
            this.db = db;
            this.wellOperationRepository = wellOperationService;
            this.processMapRepository = processMapRepository;
            this.telemetryService = telemetryService;
        }

        public async Task<IEnumerable<ProcessMapReportDto>> GetProcessMapAsync(int idWell, CancellationToken token)
        {
            var operationsRequest = new WellOperationRequest
            {
                IdWell = idWell,
                OperationCategoryIds = WellOperationCategory.MechanicalDrillingSubIds,
                OperationType = WellOperation.IdOperationTypeFact,
                SortFields = new[]{ nameof(WellOperation.DateStart) }
            };
            var allFactDrillingOperations = (await wellOperationRepository.GetAsync(operationsRequest, token))
                .Where(o => o.DepthEnd > o.DepthStart);
            
            var processMapDtos = (await processMapRepository.GetByIdWellAsync(idWell, token))!;

            var idTelemetry = telemetryService.GetOrDefaultIdTelemetryByIdWell(idWell)!.Value;
            IEnumerable<ProcessTelemetrySaubStat> telemetryDataStat = await GetTelemetryDataAsync(idTelemetry, token);
            
            var result = allFactDrillingOperations
                .GroupBy(o => o.IdWellSectionType)
                .SelectMany(sectionOperations =>
                {
                    var sectionProcessMap = processMapDtos.Where(p => p.IdWellSectionType == sectionOperations.Key);
                    return HandleSections(sectionOperations, sectionProcessMap, telemetryDataStat);
                })
                .ToList();

            return result;
        }

        private async Task<IEnumerable<ProcessTelemetrySaubStat>> GetTelemetryDataAsync(int idTelemetry, CancellationToken token)
        {
            var timezone = telemetryService.GetTimezone(idTelemetry);
            var timezoneOffset = TimeSpan.FromHours(timezone.Hours);

            var query = db.Set<TelemetryDataSaub>()
                .Where(t => t.IdTelemetry == idTelemetry)
                .Where(t => t.BlockPosition > 0.0001)
                .Where(t => t.WellDepth > 0.0001)
                .Where(t => t.WellDepth - t.BitDepth < 0.01)
                .GroupBy(t => new { H = t.DateTime.Hour, W = Math.Truncate(t.WellDepth!.Value) })
                .Select(g => new ProcessTelemetrySaubStat
                {
                    Count = g.Count(),

                    DateMin = g.Min(t => t.DateTime.UtcDateTime),
                    DateMax = g.Max(t => t.DateTime.UtcDateTime),

                    WellDepthMin = g.Min(t => t.WellDepth!.Value),
                    WellDepthMax = g.Max(t => t.WellDepth!.Value),

                    Pressure = g.Average(t => t.Pressure!.Value),
                    PressureSp = g.Average(t => t.PressureSp!.Value),
                    PressureSpRotor = g.Average(t => t.PressureSpRotor!.Value),
                    PressureSpSlide = g.Average(t => t.PressureSpSlide!.Value),
                    PressureIdle = g.Average(t => t.PressureIdle!.Value),
                    PressureDeltaLimitMax = g.Average(t => t.PressureDeltaLimitMax!.Value),

                    AxialLoad = g.Average(t => t.AxialLoad!.Value),
                    AxialLoadSp = g.Average(t => t.AxialLoadSp!.Value),
                    AxialLoadLimitMax = g.Average(t => t.AxialLoadLimitMax!.Value),

                    RotorTorque = g.Average(t => t.RotorTorque!.Value),
                    RotorTorqueSp = g.Average(t => t.RotorTorqueSp!.Value),
                    RotorTorqueLimitMax = g.Average(t => t.RotorTorqueLimitMax!.Value),

                    BlockSpeed = g.Average(t => t.BlockSpeed!.Value),
                    BlockSpeedSp = g.Average(t => t.BlockSpeedSp!.Value),
                    BlockSpeedSpRotor = g.Average(t => t.BlockSpeedSpRotor!.Value),
                    BlockSpeedSpSlide = g.Average(t => t.BlockSpeedSpSlide!.Value),
                })
                .Where(s => s.WellDepthMin != s.WellDepthMax)
                .Where(s => s.Count > 3)
                .OrderBy(t => t.DateMin);

            var data = await query.ToArrayAsync(token);
            return data;
        }

        private static IEnumerable<ProcessMapReportDto> HandleSections(
            IEnumerable<WellOperationDto> sectionOperations,
            IEnumerable<ProcessMapDto> sectionProcessMap,
            IEnumerable<ProcessTelemetrySaubStat> telemetryDataStat)
        {
            var minDepth = sectionOperations.Min(o => o.DepthStart);
            var maxDepth = sectionOperations.Max(o => o.DepthEnd);

            var depthIntervals = SplitByIntervals(minDepth, maxDepth).ToArray();
            var result = new ProcessMapReportDto[depthIntervals.Length];

            for (var i = 0; i < depthIntervals.Length; i++ )
                result[i] = MakeProcessMapReportDto(depthIntervals[i],  sectionOperations, sectionProcessMap, telemetryDataStat);
            
            return result;
        }

        private static ProcessMapReportDto MakeProcessMapReportDto(
            (double min, double max) depthInterval,
            IEnumerable<WellOperationDto> sectionOperations,
            IEnumerable<ProcessMapDto> sectionProcessMap,
            IEnumerable<ProcessTelemetrySaubStat> telemetryDataStat)
        {
            var dto = new ProcessMapReportDto{
                DepthStart = depthInterval.min
            };

            var intervalOperations = sectionOperations.Where(o => o.DepthEnd >= depthInterval.min && o.DepthStart <= depthInterval.max);
            var intervalProcessMap = sectionProcessMap.Where(map => map.DepthEnd >= depthInterval.min && map.DepthStart <= depthInterval.max);
            var intervalTelemetryDataStat = CalcIntervalTelemetryDataStat(depthInterval, telemetryDataStat);

            if (intervalOperations.Any())
            { 
                var firstIntervalOperation = intervalOperations.First();             
                var slideOperations = intervalOperations.Where(o => o.IdCategory == WellOperationCategory.IdSlide);
                var rotorOperations = intervalOperations.Where(o => o.IdCategory == WellOperationCategory.IdRotor);

                dto.DepthStart = depthInterval.min;
                dto.DateStart = GetInterpolatedDate(firstIntervalOperation, depthInterval.min);
                dto.IdWell = firstIntervalOperation.IdWell;
                dto.IdWellSectionType = firstIntervalOperation.IdWellSectionType;
                dto.WellSectionTypeName = firstIntervalOperation.WellSectionTypeName;
                dto.MechDrillingHours = CalcHours(depthInterval, sectionOperations);
                dto.Slide = CalcDrillModeStat(depthInterval, slideOperations, intervalProcessMap, intervalTelemetryDataStat);
                dto.Rotor = CalcDrillModeStat(depthInterval, rotorOperations, intervalProcessMap, intervalTelemetryDataStat);
            }            
            return dto;
        }

        private static ProcessTelemetrySaubStat? CalcIntervalTelemetryDataStat((double min, double max) depthInterval, IEnumerable<ProcessTelemetrySaubStat> telemetryDataStat)
        {
            ProcessTelemetrySaubStat[] data = telemetryDataStat
                .Where(d => d.WellDepthMin <= depthInterval.max && d.WellDepthMax >= depthInterval.min)
                .ToArray();

            if (!data.Any())
                return null;

            if (data.Length == 1)
                return data.First();


            var result = new ProcessTelemetrySaubStat
            {
                WellDepthMin = data.Min(d => d.WellDepthMin),
                WellDepthMax = data.Max(d => d.WellDepthMax),
                DateMin = data.Min(d => d.DateMin),
                DateMax = data.Max(d => d.DateMax),
            };

            var intervalDeltaDepth = result.WellDepthMax - result.WellDepthMin;

            foreach (var item in data)
            {
                var itemWeight = (item.WellDepthMax - item.WellDepthMin) / intervalDeltaDepth;

                result.Pressure += item.Pressure * itemWeight;
                result.PressureSp += item.PressureSp * itemWeight;
                result.PressureSpRotor += item.PressureSpSlide * itemWeight;
                result.PressureIdle += item.PressureIdle * itemWeight;

                result.AxialLoad += item.AxialLoad * itemWeight;
                result.AxialLoadSp += item.AxialLoadSp * itemWeight;
                result.AxialLoadLimitMax += item.AxialLoadLimitMax * itemWeight;

                result.RotorTorque += item.RotorTorque * itemWeight;
                result.RotorTorqueSp += item.RotorTorqueSp * itemWeight;
                result.RotorTorqueLimitMax += item.RotorTorqueLimitMax * itemWeight;
                
                result.BlockSpeed += item.BlockSpeed * itemWeight;
                result.BlockSpeedSp += item.BlockSpeedSp * itemWeight;
                result.BlockSpeedSpRotor += item.BlockSpeedSpRotor * itemWeight;
                result.BlockSpeedSpSlide += item.BlockSpeedSpSlide * itemWeight;
            }

            return result;
        }

        private static ProcessMapReportRowDto CalcDrillModeStat(
            (double min, double max) depthInterval, 
            IEnumerable<WellOperationDto> intervalModeOperations, 
            IEnumerable<ProcessMapDto> intervalProcessMap,
            ProcessTelemetrySaubStat? telemetryDataStat)
        {
            var dto = new ProcessMapReportRowDto();
            if (intervalModeOperations.Any())
            {
                var deltaDepth = CalcDeltaDepth(depthInterval, intervalModeOperations);
                dto.DeltaDepth = deltaDepth;
                dto.Rop = deltaDepth / CalcHours(depthInterval, intervalModeOperations);

                var processMapFirst = intervalProcessMap.First();

                dto.PressureDiff.SetpointPlan = processMapFirst.Pressure.Plan;
                dto.AxialLoad.SetpointPlan = processMapFirst.AxialLoad.Plan;
                dto.TopDriveTorque.SetpointPlan = processMapFirst.TopDriveTorque.Plan;
                dto.SpeedLimit.SetpointPlan = double.NaN;
            };

            if (telemetryDataStat is not null)
            {
                dto.PressureDiff.SetpointFact = telemetryDataStat.PressureSp;
                dto.PressureDiff.Fact = telemetryDataStat.Pressure;
                dto.PressureDiff.Limit = telemetryDataStat.PressureDeltaLimitMax;

                dto.AxialLoad.SetpointFact = telemetryDataStat.AxialLoadSp;
                dto.AxialLoad.Fact = telemetryDataStat.AxialLoad;
                dto.AxialLoad.Limit = telemetryDataStat.AxialLoadLimitMax;

                dto.TopDriveTorque.SetpointFact = telemetryDataStat.RotorTorqueSp;
                dto.TopDriveTorque.Fact = telemetryDataStat.RotorTorque;
                dto.TopDriveTorque.Limit = telemetryDataStat.RotorTorqueLimitMax;
            }

            return dto;
        }

        private static double CalcDeltaDepth((double min, double max) depthInterval, IEnumerable<WellOperationDto> intervalOperations)
        {
            var ddepth = 0d;
            foreach (var operation in intervalOperations) 
            {
                var depthStart = operation.DepthStart > depthInterval.min
                    ? operation.DepthStart
                    : depthInterval.min;

                var depthEnd = operation.DepthEnd < depthInterval.max
                    ? operation.DepthEnd
                    : depthInterval.max;

                ddepth += (depthEnd - depthEnd);
            }
            return ddepth;
        }

        private static double CalcHours((double min, double max) depthInterval, IEnumerable<WellOperationDto> intervalOperations)
        {
            var hours = 0d;
            foreach (var operation in intervalOperations)
            {
                var dateStart = operation.DepthStart > depthInterval.min
                    ? operation.DateStart
                    : GetInterpolatedDate(operation, depthInterval.min);

                var dateEnd = operation.DepthEnd < depthInterval.max
                    ? operation.DateStart + TimeSpan.FromHours(operation.DurationHours)
                    : GetInterpolatedDate(operation, depthInterval.max);

                hours += (dateEnd - dateStart).TotalHours;
            }
            return hours;            
        }

        private static DateTime GetInterpolatedDate(WellOperationDto operation, double depth)
        {
            if (operation.DepthStart > depth)
                throw new ArgumentOutOfRangeException(nameof(depth));

            var ratio = (depth - operation.DepthStart) / (operation.DepthEnd - operation.DepthStart);
            var deltaHours = operation.DurationHours * ratio;
            var interpolatedDate = operation.DateStart + TimeSpan.FromHours(deltaHours);
            return interpolatedDate;
        }

        private static IEnumerable<(double min, double max)> SplitByIntervals(double min, double max)
        {
            const double step = 100;
            var iMin = min;
            var iMax = (1 + (int)(min / step)) * step;
            for (; iMax < max; iMax += step)
            {
                yield return (iMin, iMax);
                iMin = iMax;
            }
            yield return (iMin, max);
        }
    }
#nullable disable
}