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

namespace AsbCloudInfrastructure.Services;

public class WellboreService : IWellboreService
{
	private readonly IWellService wellService;
	private readonly IWellOperationRepository wellOperationRepository;

	public WellboreService(IWellService wellService, IWellOperationRepository wellOperationRepository)
	{
		this.wellService = wellService;
		this.wellOperationRepository = wellOperationRepository;
	}

	public async Task<WellboreDto?> GetWellboreAsync(int idWell, int idSection, CancellationToken cancellationToken)
	{
		var well = await wellService.GetOrDefaultAsync(idWell, cancellationToken);

		var section = wellOperationRepository.GetSectionTypes()
			.FirstOrDefault(w => w.Id == idSection);

		if (well is null || section is null)
			return null;

		var factOperations = await GetFactOperationsAsync(idWell, idSection, cancellationToken);

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

		var firstOperation = factOperations.First();
		var lastOperation = factOperations.Last();

		return new WellboreDto
		{
			Id = section.Id,
			Name = section.Caption,
			IdWell = well.Id,
			WellName = well.Caption,
			IdWellState = well.IdState,
			IdWellTelemetry = well.IdTelemetry,
			WellTimezone = well.Timezone.Adapt<SimpleTimezoneDto>(),
			DepthFrom = firstOperation.DepthStart,
			DepthTo = lastOperation.DepthEnd,
			DateFrom = firstOperation.DateStart,
			DateTo = lastOperation.DateStart.AddHours(lastOperation.DurationHours),
		};
	}

	public async Task<IEnumerable<WellboreDto>> GetWellboresAsync(WellboreRequest request,
		CancellationToken cancellationToken)
	{
		var wellbores = new List<WellboreDto>();
		var skip = request.Skip ?? 0;
		var take = request.Take ?? 10;

		var sections = wellOperationRepository.GetSectionTypes()
			.ToDictionary(w => w.Id, w => w);

		foreach (var (idWell, idSection) in request.Ids)
		{
			var well = await wellService.GetOrDefaultAsync(idWell, cancellationToken);

			if (well is null)
				continue;

			var factOperations = (await GetFactOperationsAsync(well.Id, idSection, cancellationToken))
				.GroupBy(o => o.IdWellSectionType);

			wellbores.AddRange(from factOperation in factOperations
				let firstOperation = factOperation.First()
				let lastOperation = factOperation.Last()
				select new WellboreDto
				{
					Id = sections[factOperation.Key].Id,
					Name = sections[factOperation.Key].Caption,
					IdWell = well.Id,
					WellName = well.Caption,
					IdWellState = well.IdState,
					IdWellTelemetry = well.IdTelemetry,
					WellTimezone = well.Timezone.Adapt<SimpleTimezoneDto>(),
					DepthFrom = firstOperation.DepthStart,
					DepthTo = lastOperation.DepthEnd,
					DateFrom = firstOperation.DateStart,
					DateTo = lastOperation.DateStart.AddHours(lastOperation.DurationHours),
				});
		}

		return wellbores.Skip(skip).Take(take);
	}

	private async Task<IOrderedEnumerable<WellOperationDto>> GetFactOperationsAsync(int idWell, int? idSection,
		CancellationToken cancellationToken)
	{
		var request = new WellOperationRequest
		{
			IdWell = idWell,
			OperationType = WellOperation.IdOperationTypeFact,
			SortFields = new[] { "DateStart asc" },
		};

		if (idSection.HasValue)
			request.SectionTypeIds = new[] { idSection.Value };

		return (await wellOperationRepository.GetAsync(request, cancellationToken))
			.OrderBy(o => o.DateStart);
	}
}