using System.Security.Cryptography;
using EasyCompressor;
using Млаумчерб.Клиент.классы;
using static Млаумчерб.Клиент.сеть.Сеть;

namespace Млаумчерб.Клиент.сеть.NetworkTaskFactories;

public class JavaDownloadTaskFactory : INetworkTaskFactory
{
    private const string INDEX_URL =
        "https://launchermeta.mojang.com/v1/products/java-runtime/2ec0cc96c44e5a76b9c8b7c39df7210883d12871/all.json";
    private GameVersionDescriptor _descriptor;
    private IOPath _javaVersionDir;
    private SHA1 _hasher;
    private LZMACompressor _lzma;
    
    public JavaDownloadTaskFactory(GameVersionDescriptor descriptor)
    {
        _descriptor = descriptor;
        _javaVersionDir = Пути.GetJavaRuntimeDir(_descriptor.javaVersion.component);
        _hasher = SHA1.Create();
        _lzma = new LZMACompressor();
    }

    public Task<NetworkTask?> CreateAsync(bool checkHashes)
    {
        NetworkTask? networkTask = null;
        if (!CheckFiles(checkHashes))
            networkTask = new(
                    $"java runtime '{_descriptor.javaVersion.component}'",
                    GetTotalSize(),
                    Download
                );
        return Task.FromResult(networkTask);
    }

    private bool CheckFiles(bool checkHashes)
    {
        //TODO: download catalog
        //TODO: download manifest for required runtime
        //TODO: check whether files from manifest exist and match hashes
        throw new NotImplementedException();
    }
    
    private long GetTotalSize()
    {
        //TODO: sum up size of all files invalidated by CheckFiles
        throw new NotImplementedException();
    }

    private Task Download(NetworkProgressReporter pr, CancellationToken ct)
    {
        //TODO: download files using lzma decompression
        throw new NotImplementedException();
    }
}