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 telemetry = telemetryService.GetTelemetryByWellId(wellId);

            if (telemetry is null)
                return null;

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

            var drillingPeriodsInfo = db.GetDepthToInterval(telemetry.Id, intervalHoursTimestamp,
                workBeginTimestamp, 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<OperationDurationDto> GetOperationsSummary(int wellId, 
            DateTime begin = default, DateTime end = default)
        {
            var telemetry = telemetryService.GetTelemetryByWellId(wellId);

            if (telemetry is null)
                return null;

            var operations = (from a in db.DrillingAnalysis
                              where a.IdTelemetry == telemetry.Id && 
                              a.Date > begin && a.Date < end &&
                              a.IdOperation != null
                              join o in db.Operations on a.IdOperation equals o.Id
                              group a by new { a.IdOperation, o.Name } into g
                              select new OperationDurationDto
                              {
                                  ProcessName = g.Key.Name,
                                  Duration = g.Where(g => g.Duration > 0)
                                                .Sum(a => a.Duration)
                              }).ToList();

            return operations;
        }

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

            var telemetry = telemetryService.GetTelemetryByWellId(wellId);

            if (telemetry is null)
                return null;

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

            var operations = (from a in db.DrillingAnalysis
                              where a.IdTelemetry == telemetry.Id &&
                              a.IdOperation != null
                              join o in db.Operations on a.IdOperation equals o.Id
                              group a by new {
                                  Interval = Math.Floor((a.UnixDate - workBeginTimestamp + timezoneOffset) / intervalHoursTimestamp),
                                  OperationId = a.IdOperation, 
                                  o.Name } into g
                              select new
                              {
                                  IntervalStart = g.Min(d => d.Date).Date,
                                  OperationName = g.Key.Name,
                                  OperationsDuration = g.Sum(an => an.Duration)
                              }).ToList();

            var operationsGroupedByInterval = operations.GroupBy(op => op.IntervalStart)
                                                        .Select(o => new OperationInfoDto { 
                                                            IntervalBegin = o.Key, 
                                                            Operations = o.Select(opr => new OperationDetailsDto { 
                                                                OperationName = opr.OperationName, 
                                                                Duration = opr.OperationsDuration 
                                                            }).ToList()
                                                        })
                                                        .OrderBy(ops => ops.IntervalBegin);   

            return operationsGroupedByInterval;
        }

        public DrillingAnalysis GetDrillingAnalysis(IEnumerable<DataSaubBase> dataSaubBases)
        {
            var lastSaubDate = dataSaubBases.Last().Date;

            var saubWellDepths = dataSaubBases.Where(sw => sw.WellDepth is not null)
                .Select(s => (Value: (double)s.WellDepth, 
                (s.Date - dataSaubBases.First().Date).TotalSeconds));
            var saubBitDepths = dataSaubBases.Where(sw => sw.BitDepth is not null)
                .Select(s => (Value: (double)s.BitDepth, 
                (s.Date - dataSaubBases.First().Date).TotalSeconds));
            var saubBlockPositions = dataSaubBases.Where(sw => sw.BlockPosition is not null)
                .Select(s => (Value: (double)s.BlockPosition, 
                (s.Date - dataSaubBases.First().Date).TotalSeconds));
            var saubRotorSpeeds = dataSaubBases.Where(sw => sw.RotorSpeed is not null)
                .Select(s => (Value: (double)s.RotorSpeed, 
                (s.Date - dataSaubBases.First().Date).TotalSeconds));
            var saubPressures = dataSaubBases.Where(sw => sw.Pressure is not null)
                .Select(s => (Value: (double)s.Pressure, 
                (s.Date - dataSaubBases.First().Date).TotalSeconds));
            var saubHookWeights = dataSaubBases.Where(sw => sw.HookWeight is not null)
                .Select(s => (Value: (double)s.HookWeight, 
                (s.Date - dataSaubBases.First().Date).TotalSeconds));

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

            var IsBlockRising = LinearFunctionCalculator.IsValueGoesDown(blockPositionChangingIndex, -0.0001);
            var IsBlockGoesDown = LinearFunctionCalculator.IsValueGoesUp(blockPositionChangingIndex, 0.0001);
            var IsBlockStandsStill = LinearFunctionCalculator.IsValueNotChanges(blockPositionChangingIndex, (0.0001, -0.0001));

            var drillingAnalysis = new DrillingAnalysis
            {
                IdTelemetry = dataSaubBases.First().IdTelemetry,
                Date = lastSaubDate,
                UnixDate = (long)(lastSaubDate - new DateTime(1970,1,1,0,0,0)).TotalSeconds,
                Duration = (int)(dataSaubBases.Last().Date - dataSaubBases.ElementAt(dataSaubBases.Count() - 2).Date).TotalSeconds,
                IsDepthChanges = LinearFunctionCalculator.IsValueChanges(wellDepthChangingIndex, (0.0001, -0.0001)),
                IsDepthNotChanges = LinearFunctionCalculator.IsValueNotChanges(wellDepthChangingIndex, (0.0001, -0.0001)),
                IsBitRising = LinearFunctionCalculator.IsValueGoesDown(bitPositionChangingIndex, -0.0001),
                IsBitGoesDown = LinearFunctionCalculator.IsValueGoesUp(bitPositionChangingIndex, 0.0001),
                IsBitStandsStill = LinearFunctionCalculator.IsValueNotChanges(bitPositionChangingIndex, (0.0001, -0.0001)),
                IsBitDepthLess20 = LinearFunctionCalculator.IsAverageLessThanBound(saubBitDepths, 20),
                IsBlockRising = LinearFunctionCalculator.IsValueGoesDown(blockPositionChangingIndex, -0.0001),
                IsBlockGoesDown = LinearFunctionCalculator.IsValueGoesUp(blockPositionChangingIndex, 0.0001),
                IsBlockStandsStill = LinearFunctionCalculator.IsValueNotChanges(blockPositionChangingIndex, (0.0001, -0.0001)),
                IsRotorSpeedLess3 = LinearFunctionCalculator.IsAverageLessThanBound(saubRotorSpeeds, 3),
                IsRotorSpeedMore3 = LinearFunctionCalculator.IsAverageMoreThanBound(saubRotorSpeeds, 3),
                IsPressureLess20 = LinearFunctionCalculator.IsAverageLessThanBound(saubPressures, 20),
                IsPressureMore20 = LinearFunctionCalculator.IsAverageMoreThanBound(saubPressures, 20),
                IsHookWeightNotChanges = LinearFunctionCalculator.IsValueNotChanges(hookWeightChangingIndex, (0.0001, -0.0001)),
                IsHookWeightLess3 = LinearFunctionCalculator.IsAverageLessThanBound(saubHookWeights, 3),
                IdOperation = 1
            };

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

            return drillingAnalysis;
        }
    }
}