using System.Data;
using ClosedXML.Excel;
using RhSolutions.SkuParser.Abstractions;
using RhSolutions.SkuParser.Models;

namespace RhSolutions.SkuParser.Api.Services;

public class BsExcelParser : ISkuParser
{
	private IConfiguration configuration;
	// private Dictionary<Product, double> result;
	private const int rowsLookupCount = 20;
	private const decimal vat = 1.2M;
	public BsExcelParser(IConfiguration configuration)
	{
		this.configuration = configuration;
		// result = new();
	}

	public Dictionary<Product, double> ParseProducts(IFormFile file)
	{
		using XLWorkbook workbook = new(file.OpenReadStream());
		IXLWorksheet ws = workbook.Worksheet(1);
		var headers = configuration.GetSection("Headers");
		ws.AutoFilter.Clear();
		var cells = configuration.GetSection("Headers")
			.GetChildren()
			.ToDictionary(x => x.Path, x => ws.Range(1, 1, rowsLookupCount, ws.LastCellUsed().Address.ColumnNumber)
				.Search(x.Value)
				.FirstOrDefault())
			.OrderBy(x => x.Value?.Address.ColumnNumber ?? int.MaxValue);
		if (cells == null || cells.Any(x => x.Value == null))
		{
			throw new DataException($"В рабочей книге отсуствует таблица с необходимыми заголовками: {file.Name}");
		}

		var firstCell = cells.First().Value;
		var lastCell = cells.Last().Value?.WorksheetColumn().LastCellUsed();
		var table = ws.Range(firstCell, lastCell).AsTable();
		var rows = table.DataRange.Rows();
		Dictionary<Product, double> result = new();

		foreach (var row in rows.Where(r => r.Field(headers["Quantity"]).Value.IsNumber))
		{
			Product product = new()
			{
				Sku = row.Field(headers["Sku"]).GetString(),
				ProductLine = row.Field(headers["ProductLine"]).GetString() switch
				{
					"RAUTITAN" => ProductLine.RAUTITAN,
					"RAUTHERM S" => ProductLine.RAUTHERMS,
					_ => null
				},
				Name = row.Field(headers["Name"]).GetString(),
				Price = decimal.TryParse(row.Field(headers["Price"]).GetString(), out decimal value)
					? Math.Round(value * vat, 2)
					: null
			};

			double quantity = double.TryParse(row.Field(headers["Quantity"]).GetString(), out double q) ? q : 0;
			if (result.ContainsKey(product))
			{
				result[product] += quantity;
			}
			else
			{
				result.Add(product, quantity);
			}
		}
		return result;
	}
}