using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Threading;
using System.Threading.Tasks;
using AsbCloudApp.Data.AutogeneratedDailyReport;
using AsbCloudApp.Services.AutoGeneratedDailyReports;
using AsbCloudInfrastructure.Services.AutoGeneratedDailyReports.AutogeneratedDailyReportBlocks;
using ClosedXML.Excel;

namespace AsbCloudInfrastructure.Services.AutoGeneratedDailyReports;

public class AutoGeneratedDailyReportMakerService : IAutoGeneratedDailyReportMakerService
{
	private readonly IEnumerable<IExcelBlockWriter> blockWriters = new List<IExcelBlockWriter>()
	{
		new HeadExcelBlockWriter(),
		new SubsystemExcelBlockWriter(),
		new LimitingParameterExcelBlockWriter(),
		new TimeBalanceExcelBlockWriter()
	};
	
	public async Task<Stream> MakeReportAsync(AutoGeneratedDailyReportDto report, CancellationToken cancellationToken)
	{
		using var excelTemplateStream = await GetExcelTemplateStreamAsync(cancellationToken);

		using var workbook = new XLWorkbook(excelTemplateStream, XLEventTracking.Disabled);
		
		AddToWorkbook(workbook, report);
		
		MemoryStream memoryStream = new MemoryStream();
		workbook.SaveAs(memoryStream, new SaveOptions { });
		memoryStream.Seek(0, SeekOrigin.Begin);

		return memoryStream;
	}
	
	private async Task<Stream> GetExcelTemplateStreamAsync(CancellationToken cancellationToken)
	{
		var resourceName = Assembly.GetExecutingAssembly()
			.GetManifestResourceNames()
			.FirstOrDefault(n => n.EndsWith("AutogeneratedDailyReportTemplate.xlsx"))!;

		using var stream = Assembly.GetExecutingAssembly()
			.GetManifestResourceStream(resourceName)!;

		var memoryStream = new MemoryStream();
		await stream.CopyToAsync(memoryStream, cancellationToken);
		memoryStream.Position = 0;

		return memoryStream;
	}

	private void AddToWorkbook(XLWorkbook workbook, AutoGeneratedDailyReportDto report)
	{
		const string sheetName = "Рапорт";

		var sheet = workbook.Worksheets.FirstOrDefault(ws => ws.Name == sheetName)
					?? throw new FileFormatException($"Книга excel не содержит листа {sheetName}.");

		foreach (var blockBuilder in blockWriters)
		{
			blockBuilder.Write(sheet, report);
		}
	}
}