using CVRManager.Models;

namespace CVRManager.Services;

public static class InstallFolders
{
    public static string UniqueFolder(IEnumerable<InstallInfo> all, InstallInfo self, string name)
    {
        var stem = $"{Paths.SafeFolderName(name)}-{self.Id[..4]}";
        var candidate = stem;
        for (var n = 2; Taken(all, self, candidate); n++) candidate = $"{stem}-{n}";
        return candidate;
    }

    static bool Taken(IEnumerable<InstallInfo> all, InstallInfo self, string candidate)
    {
        if (all.Any(i => !ReferenceEquals(i, self) && i.Folder.Equals(candidate, StringComparison.OrdinalIgnoreCase))) return true;
        if (candidate.Equals(self.Folder, StringComparison.OrdinalIgnoreCase)) return false;
        return Directory.Exists(Path.Combine(Paths.InstallsRoot, candidate));
    }

    public static void Rename(InstallInfo info, string desiredFolder)
    {
        var oldDir = Paths.InstallDir(info);
        var newDir = Path.Combine(Paths.InstallsRoot, desiredFolder);
        if (oldDir.Equals(newDir, StringComparison.Ordinal)) return;
        if (oldDir.Equals(newDir, StringComparison.OrdinalIgnoreCase))
        {
            var temp = oldDir + ".renaming";
            Directory.Move(oldDir, temp);
            Directory.Move(temp, newDir);
        }
        else Directory.Move(oldDir, newDir);
    }
}