using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace StellaOps.Scanner.Surface.Secrets.Providers;

internal sealed class CompositeSurfaceSecretProvider : ISurfaceSecretProvider
{
    private readonly IReadOnlyList<ISurfaceSecretProvider> _providers;

    public CompositeSurfaceSecretProvider(IEnumerable<ISurfaceSecretProvider> providers)
    {
        _providers = providers?.ToArray() ?? throw new ArgumentNullException(nameof(providers));
        if (_providers.Count == 0)
        {
            throw new ArgumentException("At least one provider must be supplied.", nameof(providers));
        }
    }

    public async ValueTask<SurfaceSecretHandle> GetAsync(
        SurfaceSecretRequest request,
        CancellationToken cancellationToken = default)
    {
        foreach (var provider in _providers)
        {
            try
            {
                return await provider.GetAsync(request, cancellationToken).ConfigureAwait(false);
            }
            catch (SurfaceSecretNotFoundException)
            {
                // try next provider
            }
        }

        throw new SurfaceSecretNotFoundException(request);
    }
}