using AsbCloudApp.Data.Trajectory;
using ClosedXML.Excel;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using AsbCloudApp.Data;
using AsbCloudApp.Requests.Import;
using AsbCloudApp.Services;

namespace AsbCloudInfrastructure.Services.Trajectory.Parser;

public abstract class TrajectoryParserService<T> : IParserService<T, TrajectoryParserRequest>
	where T : TrajectoryGeoDto
{
	protected abstract ValidationResultDto<T> ParseRow(IXLRow row);

	public ParserResultDto<T> Parse(Stream file, TrajectoryParserRequest options)
	{
		using var workbook = new XLWorkbook(file, XLEventTracking.Disabled);
		var trajectoryRows = ParseFileStream(file, options);

		return trajectoryRows;
	}

	private ParserResultDto<T> ParseFileStream(Stream stream, TrajectoryParserRequest options)
	{
		using var workbook = new XLWorkbook(stream, XLEventTracking.Disabled);
		return ParseWorkbook(workbook, options);
	}

	private ParserResultDto<T> ParseWorkbook(IXLWorkbook workbook, TrajectoryParserRequest options)
	{
		var sheetTrajectory = workbook.Worksheets.FirstOrDefault(ws =>
			ws.Name.ToLower().Trim() == options.SheetName.ToLower().Trim());
		if (sheetTrajectory is null)
			throw new FileFormatException($"Книга excel не содержит листа {options.SheetName}.");
		var trajectoryRows = ParseSheet(sheetTrajectory, options);
		return trajectoryRows;
	}

	private ParserResultDto<T> ParseSheet(IXLWorksheet sheet, TrajectoryParserRequest options)
	{
		if (sheet.RangeUsed().RangeAddress.LastAddress.ColumnNumber < 6)
			throw new FileFormatException($"Лист {sheet.Name} содержит меньшее количество столбцов.");

		var count = sheet.RowsUsed().Count() - options.HeaderRowsCount;

		if (count > 1024)
			throw new FileFormatException($"Лист {sheet.Name} содержит слишком большое количество строк.");

		if (count <= 0)
			throw new FileFormatException($"Лист {sheet.Name} некорректного формата либо пустой");

		var trajectoryRows = new List<ValidationResultDto<T>>(count);
		var parseErrors = new List<string>();
		for (int i = 0; i < count; i++)
		{
			var row = sheet.Row(1 + i + options.HeaderRowsCount);
			try
			{
				var trajectoryRow = ParseRow(row);
				trajectoryRows.Add(trajectoryRow);
			}
			catch (FileFormatException ex)
			{
				parseErrors.Add(ex.Message);
			}
		}

		if (parseErrors.Any())
			throw new FileFormatException(string.Join("\r\n", parseErrors));

		return new ParserResultDto<T>
		{
			Item = trajectoryRows
		};
	}
}