using Microsoft.EntityFrameworkCore;
using PartSource.Data;
using PartSource.Data.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;

namespace PartSource.Services
{
	public class VehicleService
	{
		private readonly PartSourceContext _partSourceContext;

		public VehicleService(PartSourceContext partSourceContext)
		{
			_partSourceContext = partSourceContext;
		}

		public async Task<IList<VehicleMake>> GetAllMakes()
		{
			return await _partSourceContext.VehicleMakes.ToListAsync();
		}

		public async Task<IList<VehicleData>> GetModels(int makeId, int year)
		{
			return await _partSourceContext.VehicleData.Where(d =>
				d.MakeId == makeId
				&& d.Year == year
			)
			.ToListAsync();
		}

		public async Task<IList<BaseVehicle>> GetBaseVehicles(int makeId, int modelId, int year)
		{
			return await _partSourceContext.BaseVehicles.Where(d =>
				d.MakeId == makeId
				&& d.ModelId == modelId
				&& d.Year == year
			)
			.ToListAsync();
		}

		public async Task<IList<Engine>> GetEngines(int baseVehicleId)
		{
			return await _partSourceContext.Engines.Where(e => e.BaseVehicleId == baseVehicleId).ToListAsync();
		}

		public async Task<IList<Engine>> GetEngines(int baseVehicleId, int submodelId)
		{
			return await _partSourceContext.Engines.Where(e =>
				e.BaseVehicleId == baseVehicleId
				&& e.SubmodelId == submodelId
			)
			.ToListAsync();
		}

		public async Task<IList<Submodel>> GetSubmodels(int makeId, int modelId, int year)
		{
			return await _partSourceContext.Submodels.Where(s =>
				s.MakeId == makeId
				&& s.ModelId == modelId
				&& s.Year == modelId
			)
			.ToListAsync();
		}

		public async Task<VehicleData> GetVehicle(int baseVehicleId, int engineConfigId, int submodelId)
		{
			return await _partSourceContext.VehicleData.FirstOrDefaultAsync(d =>
				d.BaseVehicleId == baseVehicleId
				&& d.EngineConfigId == engineConfigId
				&& d.SubmodelId == submodelId
			);
		}

		public IList<string> GetYmmFitment(IList<VehicleData> vehicles)
		{
			if (vehicles.Count == 0)
			{
				return null;
			}

			IList<string> fitmentTags = new List<string>();

			IList<string> makeModels = vehicles.Select(v => $"{v.MakeName},{v.ModelName}").Distinct().ToList();

			foreach (string makeModel in makeModels)
			{
				string make = makeModel.Split(',')[0];
				string model = makeModel.Split(',')[1];

				List<string> years = vehicles
					.Where(v => v.MakeName == make && v.ModelName == model)
					.OrderBy(v => v.Year)
					.Select(v => v.Year.HasValue ? v.Year.Value.ToString().Trim() : string.Empty)
					.Distinct()
					.ToList();

				string tag = $"{string.Join('-', years)} {make.Trim()} {model.Trim()}";

				Console.WriteLine(tag);

				fitmentTags.Add(tag);
			}

			return fitmentTags;
		}


		public IList<int> GetVehicleIdFitment(IList<VehicleData> vehicles)
		{
			return vehicles.Select(v => v.VehicleToEngineConfigId).ToArray();
		}

		public IList<VehicleData> GetVehiclesForPart(string partNumber, string lineCode)
		{
			partNumber = Regex.Replace(partNumber, "[^a-zA-Z0-9]", string.Empty);

			IQueryable<string> whiCodes = _partSourceContext.DcfMappings
				.Where(d => d.LineCode == lineCode)
				.Select(d => d.WhiCode);

			IQueryable<VehicleData> vehicles = _partSourceContext.Fitments
				.Where(f => f.PartNumber == partNumber && whiCodes.Contains(f.LineCode))
				.Join(_partSourceContext.VehicleData,
					f => new { f.BaseVehicleId, f.EngineConfigId },
					v => new { v.BaseVehicleId, v.EngineConfigId },
					(f, v) => v);
				
			return vehicles.ToList();
		}
	}
}