using Explorer.Domain;
using Explorer.Domain.Abstractions;

namespace Explorer.FileOperations;

internal static class OperationAvailability
{
    public static bool IsReady(IVolumeService volumes, TransferJob job)
    {
        foreach (var path in PathsToCheck(job))
        {
            if (!IsVolumeReachable(volumes, path))
            {
                return false;
            }
        }

        return true;
    }

    public static IEnumerable<string> PathsToCheck(TransferJob job)
    {
        switch (job.Op)
        {
            case TransferOp.Delete:
                if (job.AdditionalSources.Count > 0)
                {
                    foreach (var src in job.AdditionalSources)
                    {
                        yield return src;
                    }

                    yield break;
                }

                foreach (var src in job.SourcePath.Split('|', StringSplitOptions.RemoveEmptyEntries))
                {
                    yield return src;
                }

                yield break;
            case TransferOp.Copy:
            case TransferOp.Move:
            case TransferOp.Rename:
            case TransferOp.Extract:
            case TransferOp.Compress:
            case TransferOp.AddToArchive:
                if (!string.IsNullOrWhiteSpace(job.DestinationPath))
                {
                    yield return PathRules.Parent(job.DestinationPath);
                }

                yield break;
            case TransferOp.VerifyArchive:
                yield return job.SourcePath;
                yield break;
            case TransferOp.EmptyRecycleBin:
                yield break;
        }
    }

    public static bool IsVolumeReachable(IVolumeService volumes, string path)
    {
        if (string.IsNullOrWhiteSpace(path))
        {
            return true;
        }

        if (volumes.IsPathReachable(path))
        {
            return true;
        }

        var root = PathRules.VolumeRoot(path);
        if (string.IsNullOrWhiteSpace(root))
        {
            return false;
        }

        if (!string.Equals(root, path, StringComparison.OrdinalIgnoreCase) && volumes.IsPathReachable(root))
        {
            return true;
        }

        var slashed = root.EndsWith('\\') ? root : root + "\\";
        return volumes.IsPathReachable(slashed);
    }
}