using DotBased.Logging;
using DotBased.Monads;

namespace Manager.YouTube.Util.Cipher;

public static class CipherManager
{
    private static readonly CipherDecoderCollection LoadedCiphers = [];
    private static readonly ILogger Logger = LogService.RegisterLogger(typeof(CipherManager));

    public static async Task<Result<CipherDecoder>> GetDecoderAsync(YouTubeClient client)
    {
        var relativePlayerJsUrl = client.State?.PlayerJsUrl;
        if (string.IsNullOrEmpty(relativePlayerJsUrl))
        {
            return ResultError.Fail("Could not get player js url.");
        }
        var version = GetCipherVersion(relativePlayerJsUrl);

        Logger.Debug($"Getting cipher decoder for version: {version}");
        if (LoadedCiphers.TryGetValue(version, out var cipher))
        {
            return cipher;
        }
        
        try
        {
            var decoder = await CipherDecoder.CreateAsync(relativePlayerJsUrl, version);
            LoadedCiphers.Add(decoder);
        }
        catch (Exception e)
        {
            Logger.Error(e, "Could not create cipher decoder. Version: {DecoderVersion}", version);
        }
        
        return ResultError.Fail($"Could not create cipher decoder for {relativePlayerJsUrl} (v: {version})");
    }

    private static string GetCipherVersion(string relativePlayerUrl)
    {
        var split = relativePlayerUrl.Split('/');
        var v = split[2];
        var lang = split[4];
        return $"{v}_{lang}";
    }
}