using System;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using AsbCloudApp.Data;
using AsbCloudApp.Services;
using AsbCloudDb.Model;
using Microsoft.EntityFrameworkCore;

namespace AsbCloudInfrastructure.Services
{
    public class DrillParamsService : CrudServiceBase<DrillParamsDto, DrillParams>, IDrillParamsService
    {
        private readonly IAsbCloudDbContext db;
        private readonly ITelemetryService telemetryService;
        
        public DrillParamsService(IAsbCloudDbContext context, ITelemetryService telemetryService) 
            : base(context)
        {
            this.telemetryService = telemetryService;
        }
        public async Task<DrillParamsDto> GetDefaultDrillParamsAsync(int idWell, double startDepth,
            double endDepth, CancellationToken token = default)
        {
            var idTelemetry = telemetryService.GetIdTelemetryByIdWell(idWell);

            if (idTelemetry is null)
                return null;

            var axialLoads = await GetDrillParams(idWell, startDepth, endDepth, 
                (telemetry) => telemetry.AxialLoad, token);
            
            var pressures = await GetDrillParams(idWell, startDepth, endDepth, 
                (telemetry) => telemetry.Pressure, token);

            var drillParamsDto = new DrillParamsDto()
            {
                IdWell = idWell,
                DepthStart = startDepth,
                DepthEnd = endDepth,
                AxialLoadMin = axialLoads.Min,
                AxialLoadAvg = axialLoads.Avg,
                AxialLoadMax = axialLoads.Max,
                PressureMin = pressures.Min,
                PressureAvg = pressures.Avg,
                PressureMax = pressures.Max,
                // TopDriveTorqueMin = topDriveTorques.Min ?? 0,
                // TopDriveTorqueAvg = topDriveTorques.Avg ?? 0,
                // TopDriveTorqueMax = topDriveTorques.Max ?? 0,
                // TopDriveSpeedMin = topDriveSpeeds.Min ?? 0,
                // TopDriveSpeedAvg = topDriveSpeeds.Avg ?? 0,
                // TopDriveSpeedMax = topDriveSpeeds.Max ?? 0,
                // ConsumptionMin = consumptions.Min ?? 0,
                // ConsumptionAvg = consumptions.Avg ?? 0,
                // ConsumptionMax = consumptions.Max ?? 0,
            };

            return drillParamsDto;
        }

        private async Task<(double Min, double Avg, double Max)> GetDrillParams(int idTelemetry, 
            double startDepth, double endDepth, Func<TelemetryDataSaub, double?> func, 
            CancellationToken token = default)
        {
            var res = await (from telemetry in db.TelemetryDataSaub
                                       where telemetry.IdTelemetry == idTelemetry &&
                                             telemetry.WellDepth >= startDepth &&
                                             telemetry.WellDepth <= endDepth
                                       group telemetry by telemetry.IdTelemetry into g
                                       select new { Min = g.Min(func), Avg = g.Average(func), Max = g.Max(func) })
                                       .DefaultIfEmpty()
                                       .AsNoTracking()
                                       .FirstOrDefaultAsync(token)
                                       .ConfigureAwait(false);

            return (res.Min ?? 0, res.Avg ?? 0, res.Max ?? 0);
        }
            
    }
}