using Microsoft.EntityFrameworkCore;
using Newtonsoft.Json;
using PartSource.Automation.Jobs.Interfaces;
using PartSource.Automation.Models;
using PartSource.Data;
using PartSource.Data.Models;
using PartSource.Services;
using PartSource.Services.Integrations;
using Ratermania.Shopify.Entities;
using System;
using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;

namespace PartSource.Automation.Jobs
{
	public class UpdatePositioning : IAutomationJob
	{
		private readonly ShopifyClient _shopifyClient;
		private readonly PartSourceContext _partSourceContext;
		private readonly VehicleService _vehicleService;

		public UpdatePositioning(PartSourceContext partSourceContext, ShopifyClient shopifyClient, VehicleService vehicleService)
		{
			_partSourceContext = partSourceContext;
			_shopifyClient = shopifyClient;
			_vehicleService = vehicleService;
		}

		public async Task<AutomationJobResult> Run()
		{
			IDictionary<string, object> parameters = new Dictionary<string, object>
			{
				{ "limit", 250 }
			};

			IEnumerable<Product> products = await _shopifyClient.Products.Get(parameters);

			while (products != null && products.Any())
			{
				foreach (Product product in products)
				{
					try
					{
						ImportData importData = _partSourceContext.ImportData.FirstOrDefault(i => i.VariantSku == product.Variants[0].Sku);

						if (importData?.LineCode == "SVG")  // Headlights go in front, DUH
						{
							continue;
						}

						IList<Fitment> fitments = GetPositionOrderedFitments(importData?.PartNumber, importData?.LineCode);
						IList<Vehicle> vehicles = _vehicleService.GetVehiclesForPart(importData?.PartNumber, importData?.LineCode);

						if (fitments.Count == 0 || vehicles.Count == 0)
						{
							continue;
						}

						await DeletePositionMetafields(product.Id);

						string currentPosition = fitments[0].Position;
						List<int> vehicleIds = new List<int>();

						foreach (Fitment fitment in fitments)
						{
							if (fitment.Position != currentPosition)
							{
								await SavePositionMetafield(product, vehicleIds, currentPosition);

								currentPosition = fitment.Position;
								vehicleIds = new List<int>();
							}

							// We don't need to DCF map because these are both sourced from WHI
							IList<int> fitmentVehicleIds = vehicles.Where(v => v.BaseVehicleId == fitment.BaseVehicleId && v.EngineConfigId == fitment.EngineConfigId)
								.Select(v => v.VehicleToEngineConfigId)
								.Distinct()
								.ToList();

							vehicleIds.AddRange(fitmentVehicleIds);
						}

						await SavePositionMetafield(product, vehicleIds, currentPosition);

						importData.UpdatedAt = DateTime.Now;
						importData.UpdateType = "Positioning";

						
					}

					catch (Exception ex)
					{
						Console.WriteLine($"{product.Id}: {ex.Message}");
					}
				}

				try
				{
					Console.Write('.');
					await _partSourceContext.SaveChangesAsync();
					products = await _shopifyClient.Products.GetNext();
				}

				catch (Exception ex)
				{
					Console.WriteLine($"Retrying: {ex.Message}");

					products = await _shopifyClient.Products.GetPrevious();
				}
			}

			return new AutomationJobResult
			{
				Message = "Positioning updated successfully",
				IsSuccess = true
			};
		}

		private IList<Fitment> GetPositionOrderedFitments(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);

			return _partSourceContext.Fitments
				.Where(f => f.PartNumber == partNumber && whiCodes.Contains(f.LineCode) && !string.IsNullOrEmpty(f.Position))
				.OrderBy(f => f.Position)
				.ToList();

		}

		[SuppressMessage("Globalization", "CA1308:Normalize strings to uppercase", Justification = "It's a Shopify metafield key")]
		private async Task SavePositionMetafield(Product product, IList<int> vehicleIds, string position)
		{
			if (vehicleIds.Count == 0)
			{
				return;
			}

			string json = JsonConvert.SerializeObject(vehicleIds);
			if (json.Length >= 100000)
			{
				// TODO: Logging
				return;
			}

			string key = position.ToLowerInvariant().Replace(" ", "_");
			if (key.Length > 20)
			{
				key = key.Substring(0, 20);
			}

			Metafield vehicleMetafield = new Metafield
			{
				Namespace = "position",
				Key = key,
				Value = json,
				ValueType = "json_string",
				OwnerResource = "product",
				OwnerId = product.Id
			};

			System.Diagnostics.Debug.WriteLine(json);

			await _shopifyClient.Metafields.Add(vehicleMetafield);
		}

		private async Task DeletePositionMetafields(long shopifyId)
		{
			IDictionary<string, object> parameters = new Dictionary<string, object>
			{
				{ "metafield[owner_id]", shopifyId},
				{ "metafield[owner_resource]", "product" },
				{ "namespace", "position" },
			};

			IEnumerable<Metafield> metafields = await _shopifyClient.Metafields.Get(parameters);

			foreach (Metafield metafield in metafields)
			{
				await _shopifyClient.Metafields.Delete(metafield);
			}
		}
	}
}