using StellaOps.Scanner.Cache.Abstractions;
using StellaOps.Scanner.Surface.Env;
using System;
using System.IO;
using System.Threading;
using System.Threading.Tasks;

namespace StellaOps.Scanner.Reachability;

public interface IReachabilityUnionPublisherService
{
    Task<ReachabilityUnionPublishResult> PublishAsync(ReachabilityUnionGraph graph, string analysisId, CancellationToken cancellationToken = default);
}

/// <summary>
/// Default service that writes a union graph to CAS using the worker surface cache root.
/// </summary>
public sealed class ReachabilityUnionPublisherService : IReachabilityUnionPublisherService
{
    private readonly ISurfaceEnvironment environment;
    private readonly IFileContentAddressableStore cas;
    private readonly ReachabilityUnionPublisher publisher;

    public ReachabilityUnionPublisherService(
        ISurfaceEnvironment environment,
        IFileContentAddressableStore cas,
        ReachabilityUnionPublisher publisher)
    {
        this.environment = environment ?? throw new ArgumentNullException(nameof(environment));
        this.cas = cas ?? throw new ArgumentNullException(nameof(cas));
        this.publisher = publisher ?? throw new ArgumentNullException(nameof(publisher));
    }

    public Task<ReachabilityUnionPublishResult> PublishAsync(ReachabilityUnionGraph graph, string analysisId, CancellationToken cancellationToken = default)
    {
        var workRoot = Path.Combine(environment.Settings.CacheRoot.FullName, "reachability");
        Directory.CreateDirectory(workRoot);
        return publisher.PublishAsync(graph, cas, workRoot, analysisId, cancellationToken);
    }
}