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(string query)
    {
        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);
        }
    }
}