using System;
using System.Collections.Concurrent;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
using StellaOps.Scanner.Cache.Abstractions;

namespace StellaOps.Scanner.Reachability.Tests;

internal sealed class FakeFileContentAddressableStore : IFileContentAddressableStore
{
    private readonly ConcurrentDictionary<string, byte[]> store = new();

    public byte[]? GetBytes(string key)
        => store.TryGetValue(key, out var bytes) ? bytes : null;

    public ValueTask<FileCasEntry?> TryGetAsync(string sha256, CancellationToken cancellationToken = default)
    {
        if (store.TryGetValue(sha256, out var bytes))
        {
            return ValueTask.FromResult<FileCasEntry?>(new FileCasEntry(sha256, bytes.LongLength, DateTimeOffset.UtcNow, DateTimeOffset.UtcNow, sha256 + ".zip"));
        }

        return ValueTask.FromResult<FileCasEntry?>(null);
    }

    public Task<FileCasEntry> PutAsync(FileCasPutRequest request, CancellationToken cancellationToken = default)
    {
        using var ms = new MemoryStream();
        request.Content.CopyTo(ms);
        store[request.Sha256] = ms.ToArray();
        return Task.FromResult(new FileCasEntry(request.Sha256, ms.Length, DateTimeOffset.UtcNow, DateTimeOffset.UtcNow, request.Sha256 + ".zip"));
    }

    public Task<bool> RemoveAsync(string sha256, CancellationToken cancellationToken = default)
        => Task.FromResult(store.TryRemove(sha256, out _));

    public Task<int> EvictExpiredAsync(CancellationToken cancellationToken = default) => Task.FromResult(0);
    public Task<int> ExportAsync(string destinationDirectory, CancellationToken cancellationToken = default) => Task.FromResult(0);
    public Task<int> ImportAsync(string sourceDirectory, CancellationToken cancellationToken = default) => Task.FromResult(0);
    public Task<int> CompactAsync(CancellationToken cancellationToken = default) => Task.FromResult(0);
}