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// 
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using Duplicati.Library.Interface;

namespace Duplicati.CommandLine.SourceTool;

/// <summary>
/// Common methods for the source tool
/// </summary>
public static partial class Common
{
    /// <summary>
    /// Visits all entries in the source provider
    /// </summary>
    /// <param name="source">The source provider to visit</param>
    /// <param name="maxdepth">The maximum depth to visit</param>
    /// <param name="visitor">The visitor function</param>
    /// <param name="token">The cancellation token</param>
    /// <returns>An awaitable task</returns>
    public static async Task Visit(ISourceProvider source, int maxdepth, Func<ISourceProviderEntry, int, Task<bool>> visitor, CancellationToken token)
    {
        var visit = new Stack<(ISourceProviderEntry Entry, int Level)>();
        await foreach (var item in source.Enumerate(token))
            visit.Push((item, 0));

        while (visit.Count() != 0)
        {
            var item = visit.Pop();
            var process = await visitor(item.Entry, item.Level);
            if (item.Entry.IsFolder && process && (item.Level < maxdepth || maxdepth <= 0))
            {
                await foreach (var subitem in item.Entry.Enumerate(token))
                {
                    if (subitem.IsFolder)
                        visit.Push((subitem, item.Level + 1));
                    else
                        await visitor(subitem, item.Level);
                }
            }
        }
    }
}
