using System.Threading;
using System.Threading.Tasks;
using Wabbajack.Hashing.xxHash64;
using Wabbajack.Paths.IO;
using Xunit;

namespace Wabbajack.VFS.Test
{
    public class HashCacheTest
    {
        private readonly FileHashCache _cache;
        private readonly TemporaryFileManager _manager;

        public HashCacheTest(FileHashCache cache, TemporaryFileManager manager)
        {
            _cache = cache;
            _manager = manager;
        }


        [Fact]
        public async Task CanCacheAndPurgeHashes()
        {
            var testFile = _manager.CreateFile();
            await testFile.Path.WriteAllTextAsync("Cheese for Everyone!");

            Assert.Equal(Hash.FromBase64("eSIyd+KOG3s="),
                await _cache.FileHashCachedAsync(testFile.Path, CancellationToken.None));
            Assert.True(_cache.TryGetHashCache(testFile.Path, out var hash));

            _cache.Purge(testFile.Path);
            Assert.False(_cache.TryGetHashCache(testFile.Path, out _));
            Assert.Equal(hash, await _cache.FileHashCachedAsync(testFile.Path, CancellationToken.None));

            Assert.True(_cache.TryGetHashCache(testFile.Path, out _));

            _cache.VacuumDatabase();
        }
    }
}