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

namespace AsbCloudInfrastructure.Services.WellOperationService.WellOperationService;
public class WellOperationService : IWellOperationService
{
    private readonly IWellService wellService;
    private readonly IWellOperationRepository wellOperationRepository;
    private readonly IWellOperationCategoryRepository wellOperationCategoryRepository;

    public WellOperationService(
        IWellService wellService,
        IWellOperationRepository wellOperationRepository,
        IWellOperationCategoryRepository wellOperationCategoryRepository)
    {
        this.wellService = wellService;
        this.wellOperationRepository = wellOperationRepository;
        this.wellOperationCategoryRepository = wellOperationCategoryRepository;
    }

    public async Task<IEnumerable<WellOperationDto>> GetAsync(WellOperationRequest request, CancellationToken token)
    {
        var (items, _) = await GetWithDaysAndNpvAsync(request, token);
        return items;
    }

    public async Task<PaginationContainer<WellOperationDto>> GetPageAsync(WellOperationRequest request, CancellationToken token)
    {
        request.Skip = request.Skip ?? 0;
        request.Take = request.Take ?? 32;

        var (items, count) = await GetWithDaysAndNpvAsync(request, token);

        var paginationContainer = new PaginationContainer<WellOperationDto>
        {
            Skip = request.Skip!.Value,
            Take = request.Take!.Value,
            Count = count,
            Items = items
        };

        return paginationContainer;
    }

    public async Task<PaginationContainer<WellOperationDto>?> GetPageAsync(int idWell,
        int id,
        int operationType,
        int? take,
        IEnumerable<string>? sortFields,
        CancellationToken token)
    {
        var request = new WellOperationRequest(new[] { idWell })
        {
            OperationType = operationType,
            SortFields = sortFields,
        };

        var (wellOperations, count) = await GetWithDaysAndNpvAsync(request, token);

        var skip = 0;
        take ??= 32;

        while (skip < count)
        {
            var page = wellOperations.Skip(skip)
                .Take(take.Value);

            if (page.Any(x => x.Id == id))
            {
                var paginationContainer = new PaginationContainer<WellOperationDto>
                {
                    Skip = skip,
                    Take = take.Value,
                    Items = page,
                    Count = count
                };

                return paginationContainer;
            }

            skip += take.Value;
        }

        return null;
    }

    public async Task<IEnumerable<WellGroupOpertionDto>> GetGroupOperationsStatAsync(WellOperationRequest request, CancellationToken token)
    {
        var wellOperationsBaseDto = await wellOperationRepository.GetAll(request, token);
        var wellOperationsData = wellOperationsBaseDto
            .Select(o => new
            {
                o.IdCategory,
                DurationMinutes = o.DurationHours * 60,
                DurationDepth = o.DepthEnd - o.DepthStart
            });

        var parentRelationDictionary = wellOperationCategoryRepository.Get(true)
            .ToDictionary(c => c.Id, c => new
            {
                c.Name,
                c.IdParent
            });

        var dtos = wellOperationsData
            .GroupBy(o => o.IdCategory)
            .Select(g => new WellGroupOpertionDto
            {
                IdCategory = g.Key,
                Category = parentRelationDictionary[g.Key].Name,
                Count = g.Count(),
                MinutesAverage = g.Average(o => o.DurationMinutes),
                MinutesMin = g.Min(o => o.DurationMinutes),
                MinutesMax = g.Max(o => o.DurationMinutes),
                TotalMinutes = g.Sum(o => o.DurationMinutes),
                DeltaDepth = g.Sum(o => o.DurationDepth),
                IdParent = parentRelationDictionary[g.Key].IdParent
            });

        while (dtos.All(x => x.IdParent != null))
        {
            dtos = dtos
                .GroupBy(o => o.IdParent!)
                .Select(g =>
                {
                    var idCategory = g.Key ?? int.MinValue;
                    var category = parentRelationDictionary.GetValueOrDefault(idCategory);
                    var newDto = new WellGroupOpertionDto
                    {
                        IdCategory = idCategory,
                        Category = category?.Name ?? "unknown",
                        Count = g.Sum(o => o.Count),
                        DeltaDepth = g.Sum(o => o.DeltaDepth),
                        TotalMinutes = g.Sum(o => o.TotalMinutes),
                        Items = g.ToList(),
                        IdParent = category?.IdParent,
                    };
                    return newDto;
                });
        }

        return dtos;
    }

    private async Task<(IEnumerable<WellOperationDto> items, int count)> GetWithDaysAndNpvAsync(WellOperationRequest request, CancellationToken token)
    {
        var wellOperationRepositoryRequest = new WellOperationRepositoryRequest(request);
        var wellOperationsBaseDtos = await wellOperationRepository.GetAll(wellOperationRepositoryRequest, token);
        var groupedByWellAndTypeDtos = wellOperationsBaseDtos
            .GroupBy(e => new { e.IdWell, e.IdType });

        var result = new List<WellOperationDto>();
        var count = 0;
        foreach (var wellOperationsWithTypeDto in groupedByWellAndTypeDtos)
        {
            var firstWellOperation = wellOperationsWithTypeDto.MinBy(e => e.DateStart)!;

            var operationsWithNpt = wellOperationsWithTypeDto
                .Where(o => WellOperationCategory.NonProductiveTimeSubIds.Contains(o.IdCategory));

            var filteredWellOperations = FilterByRequest(wellOperationsWithTypeDto, request);

            count += filteredWellOperations.Count();

            if (request.Skip != null)
                filteredWellOperations = filteredWellOperations.Skip((int)request.Skip);
            if (request.Take != null)
                filteredWellOperations = filteredWellOperations.Take((int)request.Take);

            var timezoneOffset = wellService.GetTimezone(wellOperationsWithTypeDto.Key.IdWell).Offset;

            var dtos = filteredWellOperations
                .Select(dto =>
                {
                    var newDto = dto.Adapt<WellOperationDto>();
                    newDto.Day = (dto.DateStart - firstWellOperation.DateStart).TotalDays;
                    newDto.NptHours = operationsWithNpt
                        .Where(o => o.DateStart <= dto.DateStart)
                        .Sum(e => e.DurationHours);
                    return newDto;
                });

            result.AddRange(dtos);
        }

        return (result, count);
    }

    private async Task<IEnumerable<(WellOperationDto? Plan, WellOperationDto? Fact)>> GetOperationsAsync(int idWell, CancellationToken token)
    {
        var request = new WellOperationRequest(new int[] { idWell });
        var (items, _) = await GetWithDaysAndNpvAsync(request, token);

        var operationsFactWithNoPlan = items.Where(o => o.IdPlan == null && o.IdType == WellOperation.IdOperationTypeFact);

        var operationsFactWithPlan = items.Where(o => o.IdPlan != null && o.IdType == WellOperation.IdOperationTypeFact);

        var idsPlanWithFact = operationsFactWithPlan.Select(o => o.IdPlan).Distinct();
        var operationsPlanWithNoFact = items.Where(o => o.IdType == WellOperation.IdOperationTypePlan && !idsPlanWithFact.Contains(o.IdPlan));

        var capacity = operationsFactWithNoPlan.Count() + operationsFactWithPlan.Count() + operationsPlanWithNoFact.Count();
        var result = new List<(WellOperationDto? Plan, WellOperationDto? Fact)>(capacity);

        var operationsPlan = items.Where(o => o.IdType == WellOperation.IdOperationTypePlan);
        foreach (var operation in operationsFactWithPlan)
        {
            var operationPlanDict = operationsPlan.FirstOrDefault(o => o.IdPlan == operation.IdPlan);
            result.Add((operationPlanDict, operation));
        }

        foreach (var operation in operationsFactWithNoPlan)
            result.Add((null, operation));

        foreach (var operation in operationsPlanWithNoFact)
            result.Add((operation, null));

        return result
            .OrderBy(x => x.Plan?.DateStart)
            .ThenBy(x => x.Fact?.DateStart);
    }

    public async Task<IEnumerable<PlanFactPredictBase<WellOperationDto>>> GetTvdAsync(int idWell, CancellationToken token)
    {
        var wellOperations = (await GetOperationsAsync(idWell, token)).ToArray();
        if (!wellOperations.Any())
            return Enumerable.Empty<PlanFactPredictBase<WellOperationDto>>();

        var tvd = new List<PlanFactPredictBase<WellOperationDto>>(wellOperations.Length);
        var (Plan, Fact) = wellOperations.FirstOrDefault();
        var dateStart = Plan?.DateStart ?? Fact!.DateStart;
        int? iLastMatch = null;
        int iLastFact = 0;

        for (int i = 0; i < wellOperations.Length; i++)
        {
            var item = wellOperations[i];

            var planFactPredict = new PlanFactPredictBase<WellOperationDto>()
            {
                Plan = item.Plan,
                Fact = item.Fact
            };
            if (item.Plan is not null && item.Fact is not null)
                iLastMatch = i;

            if (item.Fact is not null)
                iLastFact = i;

            tvd.Add(planFactPredict);
        }

        if (iLastMatch is null || iLastMatch == wellOperations.Length - 1)
            return tvd;

        var lastMatchPlan = wellOperations[iLastMatch.Value].Plan!;
        var lastMatchPlanOperationEnd = lastMatchPlan.DateStart.AddHours(lastMatchPlan.DurationHours);
        var lastFact = wellOperations[iLastFact].Fact!;
        var lastFactDateEnd = lastFact.DateStart.AddHours(lastFact.DurationHours);
        var startOffset = lastFactDateEnd - lastMatchPlanOperationEnd;

        for (int i = iLastMatch.Value + 1; i < wellOperations.Length; i++)
        {
            if (wellOperations[i].Plan is null)
                continue;
            var predict = wellOperations[i].Plan!;
            predict.IdType = 2;
            predict.DateStart = predict.DateStart + startOffset;
            predict.Day = (predict.DateStart - dateStart).TotalDays;
            tvd[i].Predict = predict;
        }

        return tvd;
    }

    public static IEnumerable<WellOperationBaseDto> FilterByRequest(IEnumerable<WellOperationBaseDto> dtos, WellOperationRequest request)
    {
        if (request.OperationType.HasValue)
            dtos = dtos.Where(e => e.IdType == request.OperationType.Value);
        if (request.SectionTypeIds?.Any() is true)
            dtos = dtos.Where(e => request.SectionTypeIds.Contains(e.IdWellSectionType));
        if (request.OperationCategoryIds?.Any() is true)
            dtos = dtos.Where(e => request.OperationCategoryIds.Contains(e.IdCategory));
        if (request.GeDepth.HasValue)
            dtos = dtos.Where(e => e.DepthEnd >= request.GeDepth.Value);
        if (request.LeDepth.HasValue)
            dtos = dtos.Where(e => e.DepthEnd <= request.LeDepth.Value);

        if (request.GeDate.HasValue)
        {
            var geDateUtc = request.GeDate.Value.UtcDateTime;
            dtos = dtos.Where(e => e.DateStart >= geDateUtc);
        }

        if (request.LeDate.HasValue)
        {
            var leDateUtc = request.LeDate.Value.UtcDateTime;
            dtos = dtos.Where(e => e.DateStart <= leDateUtc);
        }
        if (request.SortFields?.Any() is true)
            dtos = dtos.AsQueryable().SortBy(request.SortFields);
        else
            dtos = dtos.AsQueryable().OrderBy(e => e.DateStart);

        return dtos;
    }
}