using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Logging;
using Newtonsoft.Json;
using PartSource.Automation.Models;
using PartSource.Data;
using PartSource.Data.Models;
using PartSource.Services;
using Ratermania.Automation.Interfaces;
using Ratermania.Shopify;
using Ratermania.Shopify.Exceptions;
using Ratermania.Shopify.Resources;
using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Text.RegularExpressions;
using System.Threading.Tasks;

namespace PartSource.Automation.Jobs
{
	public class UpdateFitment : IAutomationJob
	{
		private readonly ILogger<UpdateFitment> _logger;
		private readonly ShopifyClient _shopifyClient;
		private readonly PartSourceContext _partSourceContext;
		private readonly VehicleService _vehicleService;

		public UpdateFitment(ILogger<UpdateFitment> logger, PartSourceContext partSourceContext, ShopifyClient shopifyClient, VehicleService vehicleService)
		{
			_logger = logger;
			_partSourceContext = partSourceContext;
			_shopifyClient = shopifyClient;
			_vehicleService = vehicleService;
		}

		public async Task Run()
		{
			IEnumerable<Product> products = null;

			try
			{
				products = await _shopifyClient.Products.Get(new Dictionary<string, object> { { "limit", 250 } });
			}

			catch (Exception ex)
			{
				_logger.LogError("Failed to get products from Shopify", ex);
				throw;
			}

			while (products != null && products.Any())
			{
				foreach (Product product in products)
				{
					ImportData importData = null;

					try
					{
						importData = await _partSourceContext.ImportData
							.Where(i => i.ShopifyId == product.Id && i.UpdatedAt <= DateTime.Now.AddDays(-7))
							.FirstOrDefaultAsync();

						if (importData == null)
						{
							continue;
						}

						bool isFitment = false;

						IList<Vehicle> vehicles = _vehicleService.GetVehiclesForPart(importData.PartNumber, importData.LineCode, 255);

						if (vehicles.Count > 250)
						{
							vehicles = vehicles.Take(250)
								.ToList();

							_logger.LogInformation($"SKU {importData.VariantSku} fits more than 250 vehicles.  Only the first 250 will be used.");
						}

						IList<int> vehicleIdFitment = _vehicleService.GetVehicleIdFitment(vehicles);

						if (vehicleIdFitment.Count > 0)
						{
							isFitment = true;

							string json = JsonConvert.SerializeObject(vehicleIdFitment);
							if (json.Length < 100000)
							{
								Metafield vehicleMetafield = new Metafield
								{
									Namespace = "fitment",
									Key = "ids",
									Value = json,
									ValueType = "json_string",
									OwnerResource = "product",
									OwnerId = product.Id
								};

								await _shopifyClient.Metafields.Add(vehicleMetafield);
							}

							else
							{
								_logger.LogWarning($"Vehicle ID fitment data for SKU {importData.VariantSku} is too large for Shopify and cannot be added.");
								continue;
							}
						}

						IList<string> ymmFitment = _vehicleService.GetYmmFitment(vehicles);
						if (ymmFitment.Count > 0)
						{
							isFitment = true;

							string json = JsonConvert.SerializeObject(ymmFitment);
							if (json.Length < 100000)
							{
								Metafield ymmMetafield = new Metafield
								{
									Namespace = "fitment",
									Key = "seo",
									Value = json,
									ValueType = "json_string",
									OwnerResource = "product",
									OwnerId = product.Id
								};

								await _shopifyClient.Metafields.Add(ymmMetafield);
							}

							else
							{
								_logger.LogWarning($"Year/make/model fitment data for SKU {importData.VariantSku} is too large for Shopify and cannot be added.");
								continue;
							}
						}

						Metafield isFitmentMetafield = new Metafield
						{
							Namespace = "Flags",
							Key = "IsFitment",
							Value = isFitment.ToString(),
							ValueType = "string",
							OwnerResource = "product",
							OwnerId = product.Id
						};

						await _shopifyClient.Metafields.Add(isFitmentMetafield);

						List<string> tags = new List<string>
						{
							importData.LineCode,
							importData.PartNumber
						};

						for (int j = 0; j < vehicleIdFitment.Count; j += 25)
						{
							tags.Add(string.Join('-', vehicleIdFitment.Skip(j).Take(25).Select(j => $"v{j}")));
						}

						tags.AddRange(ymmFitment);

						if (tags.Count > 250)
						{
							tags = tags.Take(250).ToList();
						}

						product.Tags = string.Join(',', tags);

						await _shopifyClient.Products.Update(product);

						importData.IsFitment = isFitment;
						importData.UpdatedAt = DateTime.Now;
						importData.UpdateType = "Fitment";
					}

					catch (Exception ex)
					{
						_logger.LogError($"Failed to updated fitment data for SKU {importData?.VariantSku}", ex);
					}
				}

				try
				{
					_partSourceContext.SaveChanges();
					products = await _shopifyClient.Products.GetNext();
				}

				catch (Exception ex)
				{
					_logger.LogWarning(ex, "Failed to get the next set of products.  Retrying");
					products = await _shopifyClient.Products.GetPrevious();
				}
			}
		}
	}
}