using System;
using System.IO;
using Microsoft.Extensions.Options;
using StellaOps.Scanner.Surface.Env;
using StellaOps.Scanner.Surface.FS;

namespace StellaOps.Scanner.WebService.Options;

/// <summary>
/// Aligns surface manifest store options with environment-derived cache settings.
/// </summary>
public sealed class SurfaceManifestStoreOptionsConfigurator : IConfigureOptions<SurfaceManifestStoreOptions>
{
    private readonly ISurfaceEnvironment _surfaceEnvironment;
    private readonly IOptions<SurfaceCacheOptions> _cacheOptions;

    public SurfaceManifestStoreOptionsConfigurator(
        ISurfaceEnvironment surfaceEnvironment,
        IOptions<SurfaceCacheOptions> cacheOptions)
    {
        _surfaceEnvironment = surfaceEnvironment ?? throw new ArgumentNullException(nameof(surfaceEnvironment));
        _cacheOptions = cacheOptions ?? throw new ArgumentNullException(nameof(cacheOptions));
    }

    public void Configure(SurfaceManifestStoreOptions options)
    {
        ArgumentNullException.ThrowIfNull(options);

        var settings = _surfaceEnvironment.Settings;
        options.Bucket = settings.SurfaceFsBucket;
        options.Scheme = settings.SurfaceFsEndpoint.Scheme;

        if (string.IsNullOrWhiteSpace(options.RootDirectory))
        {
            var cacheRoot = _cacheOptions.Value.RootDirectory ?? Path.Combine(Path.GetTempPath(), "stellaops", "surface-cache");
            options.RootDirectory = Path.Combine(cacheRoot, "manifests");
        }
    }
}