using ClosedXML.Excel;
using RhSolutions.Models;

namespace RhSolutions.Api.Services
{
	public class ClosedXMLParser : IPricelistParser
	{
		public List<Product> GetProducts(HttpContext context)
		{
			using (var memoryStream = new MemoryStream())
			{
				if (context == null)
				{
					return new List<Product>();
				}

				context.Request.Body.CopyToAsync(memoryStream).GetAwaiter().GetResult();
				List<Product> products = new();
				using (var wb = new XLWorkbook(memoryStream))
				{
					var table = GetTable(wb);
					var rows = table.DataRange.Rows();
					foreach (var row in rows)
					{
						if (ProductSku.TryParse(row.Field("Актуальный материал")
							.GetString(), out _))
						{
							products.Add(ParseRow(row));
						}
					}					
				}
				return products;
			}
		}
		private IXLTable GetTable(XLWorkbook wb)
		{
			var ws = wb.Worksheets.First();
			ws.AutoFilter.IsEnabled = false;
			try
			{
				var firstCellAddress = ws.Search("Программа", System.Globalization.CompareOptions.IgnoreCase)
					.First()
					.Address;

				var lastCellAddress = ws.LastCellUsed().Address;

				return ws.Range(firstCellAddress, lastCellAddress).AsTable();
			}
			catch (Exception ex)
			{
				throw new Exception($"Exception on parsing {ws.Name}:\n{ex.Message}");
			}
		}

		private Product ParseRow(IXLTableRow row)
		{
			string productLine = row.Field("Программа")
				.GetString();
			string productName = row.Field("Наименование")
				.GetString()
				.Split('\n')
				.First();
			ProductSku.TryParse(row.Field("Актуальный материал")
				.GetString(), out IEnumerable<ProductSku> productSkus);
			ProductSku.TryParse(row.Field("Прежний материал")
				.GetString(), out IEnumerable<ProductSku> deprecatedSkus);

			string measureField = new string(row.Field("Ед. изм.")
				.GetString()
				.ToLower()
				.Where(c => char.IsLetterOrDigit(c))
				.ToArray());
			Measure productMeasure;

			switch (measureField)
			{
				case "кг":
					productMeasure = Measure.Kg;
					break;
				case "м":
					productMeasure = Measure.M;
					break;
				case "м2":
					productMeasure = Measure.M2;
					break;
				case "шт":
					productMeasure = Measure.P;
					break;
				default:
					throw new ArgumentException();
			}

			string shippingSizeField = row.Field("Единица поставки")
				.GetString();

			if (!double.TryParse(shippingSizeField, out double productWarehouseCount))
			{
				productWarehouseCount = 0.0;
			}

			string onWarehouseField = row.Field("Складская программа")
				.GetString();
			bool IsOnWarehouse;

			switch (onWarehouseField)
			{
				case "x":
					IsOnWarehouse = true;
					break;
				case "под заказ":
					IsOnWarehouse = false;
					break;
				default:
					IsOnWarehouse = false;
					break;
			}

			string priceField = row.Field("Цена брутто \nЕВРО\nбез НДС")
				.GetString();

			if (!decimal.TryParse(priceField, out decimal price))
			{
				price = 0.0M;
			}

			return new Product(productSkus.First())
			{
				ProductLines = new List<string>() { productLine },
				Name = productName,
				DeprecatedSkus = deprecatedSkus.ToList(),
				ProductMeasure = productMeasure,
				DeliveryMakeUp = productWarehouseCount,
				IsOnWarehouse = IsOnWarehouse,
				Price = price
			};
		}
	}
}