using System.Text;
using OpenHarbor.Storage.Abstractions;

namespace OpenHarbor.Storage.Physical;

public class PhysicalStorageProvider : IStorageProvider
{
  public Task<IDirectoryInfo> CreateDirectoryAsync(string path, CancellationToken cancellationToken)
  {
    Directory.CreateDirectory(path);
    
    var result = new PhysicalDirectoryInfo(path);
    return Task.FromResult<IDirectoryInfo>(result);
  }

  public Task DeleteDirectoryAsync(string path, bool force = false, CancellationToken cancellationToken = default)
  {
    if (force)
      Directory.Delete(path, true);
    else
      Directory.Delete(path);

    return Task.CompletedTask;
  }

  public Task DeleteFileAsync(string path, CancellationToken cancellationToken)
  {
      File.Delete(path);
      return Task.CompletedTask;
  }

  public Task<bool> FileExistsAsync(string path, CancellationToken cancellationToken) =>
    Task.FromResult(File.Exists(path));

  public Task<List<IDirectoryInfo>> GetDirectoriesAsync(string path, CancellationToken cancellationToken)
  {
    var directoryInfo = new DirectoryInfo(path);
    var directories = directoryInfo.GetDirectories();
    
    var directoriesConverted = directories.Select(t => new PhysicalDirectoryInfo(t.FullName)).AsEnumerable<IDirectoryInfo>().ToList();
    return Task.FromResult(directoriesConverted);
  }

  public async Task<byte[]> GetFileBytesAsync(string path, CancellationToken cancellationToken)
  {
    await ThrowNotExistingAsync(path, cancellationToken);
    return await File.ReadAllBytesAsync(path, cancellationToken);
  }

  public async Task<string> GetFileContentAsync(string path, Encoding encoding, CancellationToken cancellationToken)
  {
    await ThrowNotExistingAsync(path, cancellationToken);
    return await File.ReadAllTextAsync(path, encoding, cancellationToken);
  }

  public Task<List<IFileInfo>> GetFilesAsync(string path, string? pattern = null, SearchOption searchOption = SearchOption.TopDirectoryOnly, CancellationToken cancellationToken = default)
  {
    var directoryInfo = new DirectoryInfo(path);

    FileInfo[] files;
    if (string.IsNullOrWhiteSpace(pattern))
      files = directoryInfo.GetFiles();
    else
      files = directoryInfo.GetFiles(pattern, searchOption);

    var result = files
      .Select(fileInfo => new PhysicalFileInfo(fileInfo))
      .AsEnumerable<IFileInfo>()
      .ToList();
    
    return Task.FromResult(result);
  }

  private async Task ThrowNotExistingAsync(string path, CancellationToken cancellationToken)
  {
    if (false == await FileExistsAsync(path, cancellationToken))
      throw new FileDoesNotExistException(path);
  }

  public async Task<Stream> GetFileStreamAsync(string path, CancellationToken cancellationToken)
  {
    await ThrowNotExistingAsync(path, cancellationToken);
    return new FileStream(path, FileMode.Open, FileAccess.Read);
  }

  public async Task<List<IDirectoryOrFile>> GetListAsync(string path, CancellationToken cancellationToken)
  {
    var files = await GetFilesAsync(path, cancellationToken: cancellationToken);
    var directories = await GetDirectoriesAsync(path, cancellationToken: cancellationToken);
    var result = files.AsEnumerable<IDirectoryOrFile>()
      .Concat(directories.AsEnumerable<IDirectoryOrFile>())
      .ToList();
    
    return result;
  }

  public async Task<IFileInfo> WriteFileAsync(string sourcePath, string path, IWriteFileOptions options, CancellationToken cancellationToken)
  {
    ArgumentNullException.ThrowIfNull(options);

    if (!options.OverrideIfExists && await FileExistsAsync(path, cancellationToken))
     throw new FileAlreadyExistsException(path);
  
    CreateDirectoryIfNotExisting(path);

    File.Copy(sourcePath, path, options.OverrideIfExists);
    var fileInfo = new FileInfo(path);
    var ret = new PhysicalFileInfo(fileInfo);
    return ret;
  }

  public async Task<IFileInfo> WriteFileAsync(byte[] bytes, string path, IWriteFileOptions options, CancellationToken cancellationToken)
  {
    if (options is null)
      throw new ArgumentNullException(nameof(options));

    if (!options.OverrideIfExists && await FileExistsAsync(path, cancellationToken))
      throw new FileAlreadyExistsException(path);

    CreateDirectoryIfNotExisting(path);

    await File.WriteAllBytesAsync(path, bytes, cancellationToken);
    var fileInfo = new FileInfo(path);
    var physicalFileInfo = new PhysicalFileInfo(fileInfo);
    return physicalFileInfo;
  }

  public async Task<IFileInfo> WriteFileAsync(Stream stream, string path, IWriteFileOptions options, CancellationToken cancellationToken)
  {
    ArgumentNullException.ThrowIfNull(options);

    if (!options.OverrideIfExists && await FileExistsAsync(path, cancellationToken))
      throw new FileAlreadyExistsException(path);

    CreateDirectoryIfNotExisting(path);

    if (stream.CanSeek && stream.Position != 0)
      stream.Seek(0, SeekOrigin.Begin);

    await using (var fileStream = new FileStream(path, FileMode.CreateNew, FileAccess.Write))
    {
      await stream.CopyToAsync(fileStream, cancellationToken);
      fileStream.Close();
    }

    var fileInfo = new FileInfo(path);
    var physicalinfo = new PhysicalFileInfo(fileInfo);
    return physicalinfo;
  }

  private static void CreateDirectoryIfNotExisting(string path)
  {
    var directoryPath = Path.GetDirectoryName(path);

    if (directoryPath == null)
      return;
    
    if (false == Directory.Exists(directoryPath))
      Directory.CreateDirectory(directoryPath);
  }

  public bool IsFileNameAllowed(string fileName) => true;

  public string SanitizeFileName(string key, string replacement) => key;

  public Task<IFileInfo> WriteFileAsync(string sourcePath, string path, bool overrideIfExists = true, CancellationToken cancellationToken = default)
  {
    return WriteFileAsync(sourcePath, path, new DefaultWriteOptions
    {
      OverrideIfExists = overrideIfExists
    }, cancellationToken);
  }

  public Task<IFileInfo> WriteFileAsync(byte[] bytes, string path, bool overrideIfExists = true, CancellationToken cancellationToken = default)
  {
    return WriteFileAsync(bytes, path, new DefaultWriteOptions
    {
      OverrideIfExists = overrideIfExists
    }, cancellationToken);
  }

  public Task<IFileInfo> WriteFileAsync(Stream stream, string path, bool overrideIfExists = true, CancellationToken cancellationToken = default)
  {
    return WriteFileAsync(stream, path, new DefaultWriteOptions
    {
      OverrideIfExists = overrideIfExists
    }, cancellationToken);
  }
}