using System;
using System.Collections.Generic;
using System.Linq;
using LCU.API.Collections.RepoApi.Domain.FloorPricing;
using LCU.API.Collections.RepoApi.Domain.FloorPricing.Strategies;
using LCU.API.Collections.RepoApi.Exceptions;
using LCU.Shared.Collections.RepoApiLib.Models;
using LCU.Shared.Collections.RepoApiLib.WebServices.NADA;
using Serilog;

namespace LCU.API.Collections.RepoApi.Services
{
	public class FloorPricingService : IFloorPricingService
	{
		private readonly IFloorPricingStrategyFactory _floorFloorPricingStrategyFactory;
		private readonly IImsAutoFileDataService _imsAutoFileDataService;
		private readonly IVehicleFloorPricingParametersService _vehicleFloorPricingParametersService;
		private readonly ICollateralValueService _collateralValueService;


		public FloorPricingService(
			IFloorPricingStrategyFactory floorFloorPricingStrategyFactory,
			IVehicleFloorPricingParametersService vehicleFloorPricingParametersService,
			IImsAutoFileDataService imsAutoFileDataService,
			ICollateralValueService collateralValueService)
		{
			_floorFloorPricingStrategyFactory = floorFloorPricingStrategyFactory;
			_vehicleFloorPricingParametersService = vehicleFloorPricingParametersService;
			_imsAutoFileDataService = imsAutoFileDataService;
			_collateralValueService = collateralValueService;
		}

		public FloorPriceCalculationResultSet DetermineFloorPrice(int auctionAssignmentId)
		{
			CollateralValuation collateralValuation = new CollateralValuation { };
			ImsAutoFileData imsAutoFileData = new ImsAutoFileData { };
			var floorPricingParams = _vehicleFloorPricingParametersService.ListAll().GetAwaiter().GetResult();
			try
			{
				imsAutoFileData = _imsAutoFileDataService.GetByAuctionAssignmentId(auctionAssignmentId).GetAwaiter().GetResult();
				collateralValuation = GetCollateralValuation(imsAutoFileData.VIN, imsAutoFileData.StatedMileage ?? 0, 0);
			}
			catch (Exception ex)
			{
				Log.Error(ex, $"Error when trying to Determine Floor Price for auctionAssignment with id: ${auctionAssignmentId}");
			}
			FloorPriceCalculationParams fpcParams = new FloorPriceCalculationParams()
			{
				VehicleFloorPricingParameters = floorPricingParams,
				ImsAutoFileData = imsAutoFileData,
				CollateralValuation = collateralValuation
			};

			var prices = GetCalculatedFloorPrices(fpcParams);
			var price = SelectBestFloorPrice(prices);
			var floorPriceValuesUsed = PopulateFloorPriceValuesUsed(auctionAssignmentId, fpcParams, prices, price);
			FloorPriceCalculationResultSet strategicResultSet = new FloorPriceCalculationResultSet { };
			strategicResultSet.AllResults = prices;
			strategicResultSet.PrimaryResult = price;
			strategicResultSet.FloorPriceValuesUsed = floorPriceValuesUsed;
			return strategicResultSet;
		}

		public CollateralValuation GetCollateralValuation(string VIN, int StatedMileage, int vehichleTypeKey)
		{
			CollateralValuation collateralValuation = new CollateralValuation { };
			try
			{
				collateralValuation = _collateralValueService.GetCollateralValue(VIN, StatedMileage, vehichleTypeKey);
			}
			catch (Exception ex)
			{
				if (ex.Message.Contains("license"))
				{
					Log.Error(ex, "Your collateral value service license may be invalid/expired, please notify the collections department administration.");
				}
				Log.Error(ex, "NADA ERROR when getting Collateral Value");
			}
			return collateralValuation;
		}

		public IReadOnlyCollection<FloorPriceCalculationResult> GetCalculatedFloorPrices(FloorPriceCalculationParams fpcParams)
		{
			IReadOnlyCollection<IFloorPricingStrategy> strategies =
				_floorFloorPricingStrategyFactory.GetFloorPricingStrategies();

			List<FloorPriceCalculationResult> calculationResults = new List<FloorPriceCalculationResult>();

			foreach (var floorPricingStrategy in strategies)
			{
				calculationResults.Add(floorPricingStrategy.CalculateFloorPrice(fpcParams));
			}

			return calculationResults;
		}

		public FloorPriceCalculationResult SelectBestFloorPrice(IReadOnlyCollection<FloorPriceCalculationResult> results)
		{
			var successWeight = -1;
			FloorPriceCalculationResult successResult = null;
			foreach (var result in results)
			{
				if (result.ResultWeight > successWeight && result.Success)
				{
					successWeight = result.ResultWeight;
					successResult = result;
				}
			}

			if (successResult == null)
			{
				return new FloorPriceCalculationResult()
				{
					ResultWeight = -1,
					Success = false,
					StrategyName = "Manual",
					FloorPrice = -1
				};
			}

			return successResult;
		}

		public FloorPriceValuesUsed PopulateFloorPriceValuesUsed(int auctionAssignmentId, FloorPriceCalculationParams fpcParams, IReadOnlyCollection<FloorPriceCalculationResult> prices,
			FloorPriceCalculationResult bestPrice)
		{
			var result = new FloorPriceValuesUsed
			{
				AuctionAssignmentId = auctionAssignmentId,
				RepoId = fpcParams.ImsAutoFileData.RepoId,
				CollateralValuation = fpcParams.CollateralValuation
			};
			result.AuctionGuideBookPrice = fpcParams.ImsAutoFileData.AuctionGuideBookPrice;
			var autoImsResult = prices.FirstOrDefault(x => x.StrategyName.Equals(typeof(AutoImsSuggestedValue).FullName));
			result.WasAuctionGuideBookPriceUsed = autoImsResult != null && autoImsResult.Success && autoImsResult.FloorPrice == bestPrice.FloorPrice;
			var nadaMmrResult = prices.FirstOrDefault(x => x.StrategyName.Equals(typeof(NadaMmrConditionValue).FullName));
			result.MMRNationalAdjustedPrice = fpcParams.ImsAutoFileData.MMRNationalAdjustedPrice;
			result.MMRRegionalAdjustedPrice = fpcParams.ImsAutoFileData.MMRRegionalAdjustedPrice;
			result.NADALowAdjustedAuctionValue = fpcParams.CollateralValuation.LowAdjustedAuctionValue;
			result.NADAAverageAdjustedAuctionValue = fpcParams.CollateralValuation.AverageAdjustedAuctionValue;
			result.NADAHighAdjustedAuctionValue = fpcParams.CollateralValuation.HighAdjustedAuctionValue;
			result.Condition = fpcParams.ImsAutoFileData.ApprovedVehicleGrade ?? fpcParams.ImsAutoFileData.VehicleGrade;
			if (result.Condition == null || result.Condition <= 0)
			{
				return result;
			}

			var vfpParams = Enumerable.First(Enumerable.Where(fpcParams.VehicleFloorPricingParameters,
				x => result.Condition >= x.LowCondition && result.Condition <= x.HighCondition));
			result.LowParam = vfpParams.LowCondition;
			result.HighParam = vfpParams.HighCondition;
			result.PercentageOf = vfpParams.PercentageOf;
			var hasMmrPrice = fpcParams.ImsAutoFileData.MMRNationalAdjustedPrice != null || fpcParams.ImsAutoFileData.MMRRegionalAdjustedPrice != null;
			result.WasAuctionGuideBookPriceUsed = autoImsResult != null && autoImsResult.Success && autoImsResult.StrategyName == bestPrice.StrategyName || (!hasMmrPrice && autoImsResult.FloorPrice > 0);
			result.WasMMRNationalAdjustedPriceUsed = nadaMmrResult != null && nadaMmrResult.Success && vfpParams.MMRAdjustedValue.ToLower().StartsWith("national") && hasMmrPrice;
			result.WasMMRRegionalAdjustedPriceUsed = nadaMmrResult != null && nadaMmrResult.Success && vfpParams.MMRAdjustedValue.ToLower().StartsWith("regional") && hasMmrPrice;
			result.WasNADALowAdjustedAuctionValueUsed = nadaMmrResult != null && nadaMmrResult.Success && vfpParams.NADAFirstValue.ToLower().StartsWith("low") || vfpParams.NADASecondValue.ToLower().StartsWith("low");
			result.WasNADAAverageAdjustedAuctionValueUsed = nadaMmrResult != null && nadaMmrResult.Success && vfpParams.NADAFirstValue.ToLower().StartsWith("avg") || vfpParams.NADASecondValue.ToLower().StartsWith("avg");
			result.WasNADAHighAdjustedAuctionValueUsed = nadaMmrResult != null && nadaMmrResult.Success && vfpParams.NADAFirstValue.ToLower().StartsWith("high") || vfpParams.NADASecondValue.ToLower().StartsWith("high");

			return result;
		}
	}
}