namespace RhSolutions.AddIn;

public static class RhSolutionsFunctions
{
	private static readonly IDatabaseClient databaseClient =
		RhSolutionsAddIn.ServiceProvider.GetService<IDatabaseClient>();
	private static readonly ICurrencyClient currencyClient =
		RhSolutionsAddIn.ServiceProvider.GetRequiredService<ICurrencyClient>();

	[ExcelFunction(Name = "РЕХАУ")]
	public static object ProductSearch(object[,] values)
	{
		List<string> strings = new();
		int rows = values.GetLength(0);
		int columns = values.GetLength(1);
		for (int row = 0; row < rows; row++) 
		{
			for (int column = 0; column < columns; column++) 
			{
				object value = values[row, column];
				strings.Add(value.ToString());
			} 
		}
		
		string query = string.Join(" ", strings.ToArray());
		var functionName = nameof(ProductSearch);
		var parameters = new object[] { query };
		if (ExcelAsyncUtil.RunTask(functionName, parameters, async () =>
		{
			return await databaseClient.GetProducts(query);
		}) is not IEnumerable<Product> products)
		{
			return "Загрузка...";
		}
		else if (!products.Any())
		{
			return ExcelError.ExcelErrorNA;
		}
		else
		{
			var product = products.First();
			return $"{product.Id} {product.Name}";
		}
	}

	[ExcelFunction(Name = "РЕХАУАРТИКУЛ")]
	public static object SkuSearch(string query)
	{
		if (ProductSku.TryParse(query, out var skus))
		{
			return skus.First().Id;
		}
		return ExcelError.ExcelErrorNA;
	}

	[ExcelFunction(Name = "РЕХАУИМЯ")]
	public static object GetProductName(string query)
	{
		if (!ProductSku.TryParse(query, out var skus))
		{
			return ExcelError.ExcelErrorNA;
		}
		var article = skus.First().Id;
		var functionName = nameof(GetProductName);
		var parameters = new object[] { query };
		if (ExcelAsyncUtil.RunTask(functionName, parameters, async () =>
		{
			return await databaseClient.GetProducts(article);
		}) is not IEnumerable<Product> requestResult)
		{
			return "Загрузка...";
		}
		else if (!requestResult.Any())
		{
			return ExcelError.ExcelErrorNA;
		}
		else
		{
			var firstProduct = requestResult.First();
			return firstProduct.Name;
		}
	}

	[ExcelFunction(Name = "РЕХАУЦЕНА")]
	public static object GetProductPrice(string query)
	{
		if (!ProductSku.TryParse(query, out var skus))
		{
			return ExcelError.ExcelErrorNA;
		}
		var article = skus.First().Id;
		var functionName = nameof(GetProductPrice);
		var parameters = new object[] { article };

		if (ExcelAsyncUtil.RunTask(functionName, parameters, async () =>
		{
			return await databaseClient.GetProducts(article);
		}) is not IEnumerable<Product> requestResult)
		{
			return "Загрузка...";
		}
		else if (!requestResult.Any())
		{
			return ExcelError.ExcelErrorNA;
		}
		else
		{
			var firstProduct = requestResult.First();
			return Math.Round(firstProduct.Price * 1.2m, 2);
		}
	}

	[ExcelFunction(Name = "РЕХАУЦЕНАРУБ")]
	public static object GetProductPriceRub(string query, double dateField)
	{
		if (!ProductSku.TryParse(query, out var skus))
		{
			return ExcelError.ExcelErrorNA;
		}
		var article = skus.First().Id;
		DateTime date = dateField == 0 ? DateTime.Today : DateTime.FromOADate(dateField);


		var functionName = nameof(GetProductPriceRub);
		var parameters = new object[] { date };

		if (ExcelAsyncUtil.RunTask(functionName, parameters, async () =>
		{
			var requestResult = await currencyClient.GetExchangeRate(date);
			return requestResult ?? -1m;
		}) is not decimal exchangeRate)
		{
			return "Загрузка...";
		}

		parameters = new object[] { query };
		if (ExcelAsyncUtil.RunTask(functionName, parameters, async () =>
		{
			var products = await databaseClient.GetProducts(article);
			var product = products.FirstOrDefault();
			return product == null ? -1m :
				product.Price * (decimal)exchangeRate * 1.2m;
		}) is not decimal requestResult)
		{
			return "Загрузка...";
		}
		else if (requestResult < 0 || exchangeRate < 0)
		{
			return ExcelError.ExcelErrorNA;
		}
		else
		{
			return Math.Round(requestResult, 2);
		}
	}
}