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// 
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// Software is furnished to do so, subject to the following conditions:
// 
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using Duplicati.Library.Interface;

namespace Duplicati.Library.SourceProvider;

/// <summary>
/// A source provider that wraps a file system through a snapshot service
/// </summary>
/// <param name="snapshotService">The snapshot service to use</param>
public class LocalFileSource(ISnapshotService snapshotService) : ISourceProvider
{
    /// <inheritdoc/>
    public string MountedPath => string.Empty;

    /// <inheritdoc/>
    public Task InitializeAsync(CancellationToken cancellationToken) => Task.CompletedTask;

    /// <inheritdoc/>
    public IAsyncEnumerable<ISourceProviderEntry> EnumerateAsync(CancellationToken cancellationToken)
        => snapshotService.EnumerateFilesystemEntries().ToAsyncEnumerable();

    /// <summary>
    /// The snapshot service being used
    /// </summary>
    public ISnapshotService SnapshotService => snapshotService;

    /// <inheritdoc/>
    public Task<ISourceProviderEntry?> GetEntryAsync(string path, bool isFolder, CancellationToken cancellationToken)
        => Task.FromResult(snapshotService.GetFilesystemEntry(path, isFolder));

    /// <inheritdoc/>
    public Task TestAsync(CancellationToken cancellationToken)
        => snapshotService.DirectoryExists(MountedPath) ? Task.CompletedTask : throw new Exception($"The path {MountedPath} does not exist");

    /// <inheritdoc/>
    public void Dispose()
    {
        snapshotService.Dispose();
        GC.SuppressFinalize(this);
    }
}