using System.IO;
using System.Net.Http;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.Extensions.Logging;
using Wabbajack.Hashing.xxHash64;
using Wabbajack.Networking.Http.Interfaces;
using Wabbajack.Paths;
using Wabbajack.Paths.IO;
using Wabbajack.RateLimiter;

namespace Wabbajack.Networking.Http;

public class SingleThreadedDownloader : IHttpDownloader
{
    private readonly HttpClient _client;
    private readonly ILogger<SingleThreadedDownloader> _logger;

    public SingleThreadedDownloader(ILogger<SingleThreadedDownloader> logger, HttpClient client)
    {
        _logger = logger;
        _client = client;
    }

    public async Task<Hash> Download(HttpRequestMessage message, AbsolutePath outputPath, IJob job,
        CancellationToken token)
    {
        using var response = await _client.SendAsync(message, HttpCompletionOption.ResponseHeadersRead, token);
        if (!response.IsSuccessStatusCode)
            throw new HttpException(response);

        if (job.Size == 0)
            job.Size = response.Content.Headers.ContentLength ?? 0;

        await using var stream = await response.Content.ReadAsStreamAsync(token);
        await using var outputStream = outputPath.Open(FileMode.Create, FileAccess.Write);
        return await stream.HashingCopy(outputStream, token, job);
    }
}