using System;
using System.Linq;
using AsbCloudApp.Data;
using AsbCloudApp.Services;
using AsbCloudInfrastructure.Services.Cache;
using AsbCloudDb.Model;
using System.Collections.Generic;

namespace AsbCloudInfrastructure.Services
{
    public class AnalyticsService : IAnalyticsService
    {
        private readonly IAsbCloudDbContext db;
        private readonly ITelemetryService telemetryService;
        private readonly CacheTable<Operation> cacheOperations;
        private readonly OperationDetectorService operationDetectorService;
        private readonly IEnumerable<Operation> operations;

        public AnalyticsService(IAsbCloudDbContext db, ITelemetryService telemetryService, CacheDb cacheDb)
        {
            this.db = db;
            this.telemetryService = telemetryService;
            cacheOperations = cacheDb.GetCachedTable<Operation>((AsbCloudDbContext)db);
            operations = cacheOperations.Select(c => true);
            operationDetectorService = new OperationDetectorService(operations);
        }

        public IEnumerable<WellDepthToDayDto> GetWellDepthToDay(int wellId)
        {
            var telemetry = telemetryService.GetTelemetryByWellId(wellId);

            if (telemetry is null)
                return null;

            var depthToTimeData = (from d in db.DataSaubBases
                                   where d.IdTelemetry == telemetry.Id
                                   select new
                                   {
                                       d.Id,
                                       d.WellDepth,
                                       d.BitDepth,
                                       d.Date
                                   });

            var m = (int)Math.Round(1d * depthToTimeData.Count() / 2048);

            if (m > 1)
                depthToTimeData = depthToTimeData.Where(d => d.Id % m == 0);

            return depthToTimeData.Select(d => new WellDepthToDayDto
            {
                WellDepth = d.WellDepth ?? 0.0,
                BitDepth = d.BitDepth ?? 0.0,
                Date = d.Date
            }).ToList();
        }

        public IEnumerable<WellDepthToIntervalDto> GetWellDepthToInterval(int wellId,
            int intervalHoursTimestamp, int workBeginTimestamp)
        {
            intervalHoursTimestamp = intervalHoursTimestamp == 0 ? 86400 : intervalHoursTimestamp;

            var intervalTime = new TimeSpan(0, 0, intervalHoursTimestamp);
            var workDayBeginTime = new TimeSpan(0, 0, workBeginTimestamp);

            var telemetry = telemetryService.GetTelemetryByWellId(wellId);

            if (telemetry is null)
                return null;

            var timezoneOffset = telemetryService.GetTimezoneOffsetByTelemetryId(telemetry.Id);

            var drillingPeriodsInfo = db.GetDepthToInterval(telemetry.Id, (int)intervalTime.TotalSeconds,
                (int)workDayBeginTime.TotalSeconds, timezoneOffset);

            var wellDepthToIntervalData = drillingPeriodsInfo.Select(d => new WellDepthToIntervalDto
            {
                IntervalStartDate = d.BeginPeriodDate,
                IntervalDepthProgress = (d.MaxDepth - d.MinDepth) ?? 0.0 / intervalHoursTimestamp
            }).OrderBy(d => d.IntervalStartDate).ToList();

            return wellDepthToIntervalData;
        }

        public IEnumerable<OperationPercentageDto> GetOperationsSummary(int wellId, 
            DateTime begin = default, DateTime end = default)
        {
            return new List<OperationPercentageDto>
            {
                new OperationPercentageDto { ProcessName = "Роторное бурение", Percentage = 19.7 },
                new OperationPercentageDto { ProcessName = "Подъем с проработкой", Percentage = 6.2 },
                new OperationPercentageDto { ProcessName = "Спуск с проработкой", Percentage = 9.4 },
                new OperationPercentageDto { ProcessName = "Подъем с промывкой", Percentage = 18.4 },
                new OperationPercentageDto { ProcessName = "Неподвижное состояние", Percentage = 12.1 },
                new OperationPercentageDto { ProcessName = "Вращение без циркуляции", Percentage = 7.4 },
                new OperationPercentageDto { ProcessName = "Спуск в скважину", Percentage = 16.7 },
                new OperationPercentageDto { ProcessName = "На поверхности", Percentage = 10.1 }
            };
        }

        public IEnumerable<OperationInfoDto> GetOperationsToTime(int wellId, 
            DateTime begin = default, DateTime end = default)
        {
            return new List<OperationInfoDto>
            {
                new OperationInfoDto
                {
                    IntervalBegin = new DateTime(2021, 06, 01, 08, 00, 00),
                    IntervalEnd = new DateTime(2021, 06, 02, 08, 00, 00),
                    OperationData = new List<OperationDetailsDto>
                    {
                        new OperationDetailsDto
                        {
                            OperationName = "Роторное бурение",
                            OperationStartTime = new DateTime(2021, 06, 01, 10, 00, 00),
                            DurationHours = 1.2
                        },
                        new OperationDetailsDto
                        {
                            OperationName = "Подъем с проработкой",
                            OperationStartTime = new DateTime(2021, 06, 01, 11, 00, 00),
                            DurationHours = 3.2
                        },
                        new OperationDetailsDto
                        {
                            OperationName = "Роторное бурение",
                            OperationStartTime = new DateTime(2021, 06, 01, 12, 00, 00),
                            DurationHours = 1.5
                        },
                        new OperationDetailsDto
                        {
                            OperationName = "Неподвижное состояние",
                            OperationStartTime = new DateTime(2021, 06, 01, 13, 00, 00),
                            DurationHours = 0.2
                        },
                        new OperationDetailsDto
                        {
                            OperationName = "Роторное бурение",
                            OperationStartTime = new DateTime(2021, 06, 01, 14, 00, 00),
                            DurationHours = 3.2
                        }
                    }
                },
                new OperationInfoDto
                {
                    IntervalBegin = new DateTime(2021, 06, 02, 08, 00, 00),
                    IntervalEnd = new DateTime(2021, 06, 03, 08, 00, 00),
                    OperationData = new List<OperationDetailsDto>
                    {
                        new OperationDetailsDto
                        {
                            OperationName = "На поверхности",
                            OperationStartTime = new DateTime(2021, 06, 13, 10, 01, 00),
                            DurationHours = 2.2
                        },
                        new OperationDetailsDto
                        {
                            OperationName = "Спуск в скважину",
                            OperationStartTime = new DateTime(2021, 06, 13, 11, 10, 00),
                            DurationHours = 0.4
                        },
                        new OperationDetailsDto
                        {
                            OperationName = "На поверхности",
                            OperationStartTime = new DateTime(2021, 06, 13, 12, 20, 00),
                            DurationHours = 2.5
                        },
                        new OperationDetailsDto
                        {
                            OperationName = "Вращение без циркуляции",
                            OperationStartTime = new DateTime(2021, 06, 13, 13, 00, 00),
                            DurationHours = 1.2
                        },
                        new OperationDetailsDto
                        {
                            OperationName = "Роторное бурение",
                            OperationStartTime = new DateTime(2021, 06, 13, 14, 00, 00),
                            DurationHours = 5.2
                        }
                    }
                },
                new OperationInfoDto
                {
                    IntervalBegin = new DateTime(2021, 06, 03, 08, 00, 00),
                    IntervalEnd = new DateTime(2021, 06, 04, 08, 00, 00),
                    OperationData = new List<OperationDetailsDto>
                    {
                        new OperationDetailsDto
                        {
                            OperationName = "Подъем с проработкой",
                            OperationStartTime = new DateTime(2021, 06, 12, 10, 00, 00),
                            DurationHours = 3.2
                        },
                        new OperationDetailsDto
                        {
                            OperationName = "Спуск с проработкой",
                            OperationStartTime = new DateTime(2021, 06, 12, 11, 00, 00),
                            DurationHours = 1.4
                        },
                        new OperationDetailsDto
                        {
                            OperationName = "Подъем с проработкой",
                            OperationStartTime = new DateTime(2021, 06, 12, 12, 00, 00),
                            DurationHours = 0.5
                        },
                        new OperationDetailsDto
                        {
                            OperationName = "На поверхности",
                            OperationStartTime = new DateTime(2021, 06, 12, 13, 00, 00),
                            DurationHours = 3.2
                        },
                        new OperationDetailsDto
                        {
                            OperationName = "Роторное бурение",
                            OperationStartTime = new DateTime(2021, 06, 13, 14, 00, 00),
                            DurationHours = 1.2
                        }
                    }
                }
            };
        }

        public DrillingAnalysis GetDrillingAnalysis(IEnumerable<DataSaubBase> dataSaubBases)
        {
            var saubWellDepths = dataSaubBases.Select(s => (s.WellDepth, 
                TotalSeconds: (s.Date - 
                new DateTime(1970, 1, 1, 0, 0, 0)).TotalSeconds - 1530000000));
            var saubBitDepths = dataSaubBases.Select(s => (s.BitDepth, 
                TotalSeconds: (s.Date - 
                new DateTime(1970, 1, 1, 0, 0, 0)).TotalSeconds - 1530000000));
            var saubBlockPositions = dataSaubBases.Select(s => (s.BlockPosition, 
                TotalSeconds: (s.Date - 
                new DateTime(1970, 1, 1, 0, 0, 0)).TotalSeconds - 1530000000));
            var saubRotorSpeeds = dataSaubBases.Select(s => (s.RotorSpeed,
                TotalSeconds: (s.Date - 
                new DateTime(1970, 1, 1, 0, 0, 0)).TotalSeconds - 1530000000));
            var saubPressures = dataSaubBases.Select(s => (s.Pressure,
                TotalSeconds: (s.Date - 
                new DateTime(1970, 1, 1, 0, 0, 0)).TotalSeconds - 1530000000));
            var saubHookWeights = dataSaubBases.Select(s => (s.HookWeight,
                TotalSeconds: (s.Date - 
                new DateTime(1970, 1, 1, 0, 0, 0)).TotalSeconds - 1530000000));

            var wellDepthChangingIndex = GetAForLinearFormula(saubWellDepths);
            var bitPositionChangingIndex = GetAForLinearFormula(saubBitDepths);
            var blockPositionChangingIndex = GetAForLinearFormula(saubBlockPositions);
            var rotorSpeedChangingIndex = GetAForLinearFormula(saubRotorSpeeds);
            var pressureChangingIndex = GetAForLinearFormula(saubPressures);
            var hookWeightChangingIndex = GetAForLinearFormula(saubHookWeights);

            var drillingAnalysis = new DrillingAnalysis
            {
                IdTelemetry = dataSaubBases.First().IdTelemetry,
                Date = dataSaubBases.Last().Date,
                IsDepthChanges = wellDepthChangingIndex >= 0.0001 || wellDepthChangingIndex <= -0.0001,
                IsDepthNotChanges = wellDepthChangingIndex < 0.0001 && wellDepthChangingIndex > -0.0001,
                IsBitRising = bitPositionChangingIndex >= 0.0001,
                IsBitGoesDown = bitPositionChangingIndex <= -0.0001,
                IsBitStandsStill = bitPositionChangingIndex < 0.0001 && bitPositionChangingIndex > -0.0001,
                IsBitDepthLess20 = (saubBitDepths.Sum(s => s.BitDepth) / saubBitDepths.Count()) < 20.0,
                IsBlockRising = blockPositionChangingIndex >= 0.0001,
                IsBlockGoesDown = blockPositionChangingIndex <= -0.0001,
                IsBlockStandsStill = blockPositionChangingIndex < 0.001 && blockPositionChangingIndex > -0.0001,
                IsRotorSpeedLess3 = (saubRotorSpeeds.Sum(s => s.RotorSpeed) / saubRotorSpeeds.Count()) < 3,
                IsRotorSpeedMore3 = (saubRotorSpeeds.Sum(s => s.RotorSpeed) / saubRotorSpeeds.Count()) >= 3,
                IsPressureLess20 = (saubPressures.Sum(s => s.Pressure) / saubPressures.Count()) < 20.0,
                IsPressureMore20 = (saubPressures.Sum(s => s.Pressure) / saubPressures.Count()) >= 20.0,
                IsHookWeightNotChanges = hookWeightChangingIndex < 0.0001 && hookWeightChangingIndex > 0.0001,
                IsHookWeightLess3 = (saubHookWeights.Sum(s => s.HookWeight) / saubHookWeights.Count()) < 3.0,
                IdOperation = 1
            };

            drillingAnalysis.IdOperation = operationDetectorService.DetectOperation(drillingAnalysis).Id;

            return drillingAnalysis;
        }

        private static double GetAForLinearFormula(IEnumerable<(double?, double)> rawData)
        {
            var (xSum, ySum, xySum, x2Sum) = GetFormulaVariables(rawData);

            return (xSum * ySum - rawData.Count() * xySum) /
                   (xSum * xSum - rawData.Count() * x2Sum);
        }

        private static double GetBForLinearFormula(IEnumerable<(double?, double)> rawData)
        {
            var (xSum, ySum, xySum, x2Sum) = GetFormulaVariables(rawData);

            return (xSum * xySum - x2Sum * ySum) /
                   (xSum * xSum - rawData.Count() * x2Sum);
        }

        private static (double xSum, double ySum, double xySum, double x2Sum) GetFormulaVariables(
            IEnumerable<(double? value, double timestamp)> rawData)
        {
            var data = rawData.Select((d) => new
            {
                X = d.timestamp,
                Y = d.value ?? 0.0
            });
            var xSum = data.Sum(d => d.X);
            var ySum = data.Sum(d => d.Y);
            var xySum = data.Sum(d => d.X * d.Y);
            var x2Sum = data.Sum(d => d.X * d.X);

            return (xSum, ySum, xySum, x2Sum);
        }
    }
}