using System.Text.Json;

namespace Zcbot.WindowsNode.Tests;

public sealed class JobOfferPersistenceTests : IDisposable
{
    private readonly string root = Path.Combine(
        Path.GetTempPath(), "zcbot-job-offer-tests", Guid.NewGuid().ToString("N"));

    [Fact]
    public void AcceptedOfferIsDurableAndAConflictingDigestIsRejected()
    {
        var jobId = Guid.NewGuid();
        var leaseId = Guid.NewGuid();
        var digest = new string('d', 64);
        var inbox = new JobInboxStore(root);
        var adapters = new AdapterCatalog([new AcceptingAdapter()]);

        var accepted = inbox.Accept(Offer(jobId, leaseId, digest), adapters);

        Assert.True(accepted.Accepted);
        var requestPath = Path.Combine(
            root, jobId.ToString("D"), "request", "request.json");
        var statePath = Path.Combine(root, jobId.ToString("D"), "state.json");
        Assert.True(File.Exists(requestPath));
        Assert.True(File.Exists(statePath));
        using (var request = JsonDocument.Parse(File.ReadAllBytes(requestPath)))
        {
            Assert.Equal(
                digest,
                request.RootElement.GetProperty("request_digest").GetString());
            Assert.Equal(
                leaseId,
                request.RootElement.GetProperty("lease_id").GetGuid());
        }
        using (var state = JsonDocument.Parse(File.ReadAllBytes(statePath)))
        {
            Assert.Equal("accepted", state.RootElement.GetProperty("stage").GetString());
        }

        var conflict = inbox.Accept(
            Offer(jobId, Guid.NewGuid(), new string('e', 64)), adapters);

        Assert.False(conflict.Accepted);
        Assert.Equal("job_digest_conflict", conflict.Reason);
    }

    [Fact]
    public void SameDigestWithANewLeaseUpdatesOnlyThePersistedOfferIdentity()
    {
        var jobId = Guid.NewGuid();
        var firstLease = Guid.NewGuid();
        var secondLease = Guid.NewGuid();
        var digest = new string('f', 64);
        var inbox = new JobInboxStore(root);
        var adapters = new AdapterCatalog([new AcceptingAdapter()]);
        Assert.True(inbox.Accept(Offer(jobId, firstLease, digest), adapters).Accepted);

        var replay = inbox.Accept(Offer(jobId, secondLease, digest), adapters);

        Assert.True(replay.Accepted);
        using var request = JsonDocument.Parse(File.ReadAllBytes(Path.Combine(
            root, jobId.ToString("D"), "request", "request.json")));
        Assert.Equal(secondLease, request.RootElement.GetProperty("lease_id").GetGuid());
        Assert.Equal(digest, request.RootElement.GetProperty("request_digest").GetString());
    }

    public void Dispose()
    {
        if (Directory.Exists(root))
        {
            Directory.Delete(root, recursive: true);
        }
    }

    private static JsonElement Offer(Guid jobId, Guid leaseId, string digest)
    {
        var payload = JsonSerializer.SerializeToElement(new
        {
            job_id = jobId,
            lease_id = leaseId,
            request_digest = digest,
            capability = "test.capability@v1",
            request = new { inputs = Array.Empty<object>() },
            workspace = (object?)null,
            input_transfers = Array.Empty<object>(),
        });
        return payload;
    }

    private sealed class AcceptingAdapter : INodeAdapter
    {
        public string Capability => "test.capability@v1";
        public string DisplayName => "Test";
        public string AdapterVersion => "1.0.0";
        public IReadOnlyList<string> Features => [];
        public bool HasActiveJobs => false;
        public string RunningDetail => "running";
        public string? RuntimeId => null;
        public bool SupportsLocalAcceptance => false;
        public string RuntimePath => "test.exe";
        public string ContractPath => "contract.json";
        public string ContractSha256 => new('0', 64);
        public string? WorkspaceStateFilename => null;
        public IReadOnlyList<string> PreviewOutputIds => [];
        public AdapterRuntimeStatus DetectRuntime() =>
            new("Test", "1", AdapterVersion, "ready", "ready");
        public void InvalidateRuntime() { }
        public bool ValidateRequest(JsonElement request) => true;
        public Task RunAsync(RecoverableJob job) => Task.CompletedTask;
        public void Cancel(Guid jobId) { }
        public Task<AdapterAcceptanceResult> RunLocalAcceptanceAsync(
            string workRoot,
            IProgress<string> progress,
            CancellationToken cancellationToken) =>
            throw new NotSupportedException();
    }
}