using System.CommandLine;
using System.CommandLine.Invocation;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.Extensions.Logging;
using Wabbajack.Hashing.xxHash64;
using Wabbajack.Paths;
using Wabbajack.Paths.IO;

namespace Wabbajack.CLI.Verbs
{
    public class HashFile : IVerb
    {
        private readonly ILogger<HashFile> _logger;

        public HashFile(ILogger<HashFile> logger)
        {
            _logger = logger;
        }

        public Command MakeCommand()
        {
            var command = new Command("hash-file");
            command.Add(new Option<AbsolutePath>(new[] { "-i", "-input" }, "Path to the file to hash"));
            command.Description = "Hashes a file with Wabbajack's xxHash64 implementation";
            command.Handler = CommandHandler.Create(Run);
            return command;
        }


        public async Task<int> Run(AbsolutePath input)
        {
            await using var istream = input.Open(FileMode.Open, FileAccess.Read, FileShare.Read);
            var hash = await istream.HashingCopy(Stream.Null, CancellationToken.None);
            _logger.LogInformation($"{input} hash: {hash} {hash.ToHex()} {(long)hash}");
            return 0;
        }
    }
}