using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
using StellaOps.Scanner.Storage;

namespace StellaOps.Scanner.WebService.Options;

internal sealed class ScannerStorageOptionsPostConfigurator : IPostConfigureOptions<ScannerStorageOptions>
{
    private readonly IOptionsMonitor<ScannerWebServiceOptions> _webOptions;
    private readonly ILogger<ScannerStorageOptionsPostConfigurator> _logger;

    public ScannerStorageOptionsPostConfigurator(
        IOptionsMonitor<ScannerWebServiceOptions> webOptions,
        ILogger<ScannerStorageOptionsPostConfigurator> logger)
    {
        _webOptions = webOptions ?? throw new ArgumentNullException(nameof(webOptions));
        _logger = logger ?? throw new ArgumentNullException(nameof(logger));
    }

    public void PostConfigure(string? name, ScannerStorageOptions options)
    {
        ArgumentNullException.ThrowIfNull(options);

        var source = _webOptions.CurrentValue?.ArtifactStore;
        if (source is null)
        {
            return;
        }

        var target = options.ObjectStore ??= new ObjectStoreOptions();

        if (!string.IsNullOrWhiteSpace(source.Driver))
        {
            target.Driver = source.Driver;
        }

        if (!string.IsNullOrWhiteSpace(source.Region))
        {
            target.Region = source.Region!;
        }

        if (!string.IsNullOrWhiteSpace(source.Bucket))
        {
            target.BucketName = source.Bucket!;
        }

        if (!string.IsNullOrWhiteSpace(source.RootPrefix))
        {
            target.RootPrefix = source.RootPrefix;
        }

        if (!string.IsNullOrWhiteSpace(source.Endpoint))
        {
            if (target.IsRustFsDriver())
            {
                target.RustFs ??= new RustFsOptions();
                target.RustFs.BaseUrl = source.Endpoint;
            }
            else
            {
                target.ServiceUrl = source.Endpoint;
            }
        }

        if (target.IsRustFsDriver())
        {
            if (target.RustFs is null)
            {
                target.RustFs = new RustFsOptions();
            }

            target.RustFs.AllowInsecureTls = source.AllowInsecureTls;

            if (!string.IsNullOrWhiteSpace(source.ApiKeyHeader))
            {
                target.RustFs.ApiKeyHeader = source.ApiKeyHeader!;
            }

            if (!string.IsNullOrWhiteSpace(source.ApiKey))
            {
                target.RustFs.ApiKey = source.ApiKey;
            }

            if (!string.IsNullOrWhiteSpace(source.Endpoint))
            {
                target.RustFs.BaseUrl = source.Endpoint!;
            }
        }

        if (!string.IsNullOrWhiteSpace(source.AccessKey))
        {
            target.AccessKeyId = source.AccessKey;
        }

        if (!string.IsNullOrWhiteSpace(source.SecretKey))
        {
            target.SecretAccessKey = source.SecretKey;
        }

        if (source.Headers is { Count: > 0 })
        {
            foreach (var (key, value) in source.Headers)
            {
                if (string.IsNullOrWhiteSpace(key) || string.IsNullOrWhiteSpace(value))
                {
                    continue;
                }

                target.Headers[key] = value;
            }
        }

        _logger.LogDebug(
            "Mirrored artifact store settings into scanner storage options (driver: {Driver}, bucket: {Bucket}).",
            target.Driver,
            target.BucketName);
    }
}