using BeWo.Data.Entities;
using BS.Shared;
using BS.Shared.Core;
using BS.Shared.Exceptions;
using BS.Shared.Interface;
using DevExpress.Mvvm.Native;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.Remoting.Messaging;
using System.Security.Cryptography;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Web.UI.WebControls;
using Task = System.Threading.Tasks.Task;

namespace BeWo.Data.Access
{
	public class LocalFileStorageDAO
	{
		private readonly string _rootPath;

		public LocalFileStorageDAO(string rootPath)
		{
			_rootPath = rootPath;
		}

		private string GetFilePath(string filePath)
		{
			return Path.Combine(_rootPath, filePath);
		}

		public async Task SaveLogAsync(string pFileName, Stream content, CancellationToken cancellationToken = default)
		{
			var lFilePath = Path.Combine("logs", pFileName);

			await SaveFileAsync(lFilePath, pFileName, content, cancellationToken).ConfigureAwait(true);
		}

		private async Task SaveFileAsync(string pFilePath, string pFileName, Stream content, CancellationToken cancellationToken = default)
		{
			// Prüfe Namen
			if (SecurityUtils.ContainsInvalidFilenameChars(pFileName))
				throw new BeWoInvalidOperationException(AppError.LocalFileStorageFileNameInvalidChar);

			if (Path.GetFileName(pFilePath) != pFileName)
				throw new BeWoInvalidOperationException(AppError.LocalFileStorageFileNameNotEqFilePath);

			// Erstelle File Ordner
			var path = GetFilePath(pFilePath);
			var directory = Path.GetDirectoryName(path);
			Directory.CreateDirectory(directory);

			// Speichere Datei
			using (var stream = File.Create(path))
			{
				await content.CopyToAsync(stream, bufferSize: 81920, cancellationToken).ConfigureAwait(true);
			}
		}

		public Task<bool> FileExistsAsync(string pFilePath, CancellationToken cancellationToken = default)
		{
			return Task.FromResult(File.Exists(GetFilePath(pFilePath)));
		}

		public Task<Stream> GetFileAsync(string pFilePath, CancellationToken cancellationToken = default)
		{
			var path = GetFilePath(pFilePath);
			if (!File.Exists(path))
				return Task.FromResult<Stream>(null);

			Stream stream = File.OpenRead(path);
			return Task.FromResult(stream);
		}

		public Task<bool> DeleteFileAsync(string pFilePath, CancellationToken cancellationToken = default)
		{
			var path = GetFilePath(pFilePath);
			if (File.Exists(path))
			{
				File.Delete(path);
				return Task.FromResult(true);
			}

			return Task.FromResult(false);
		}
	}
}