// Copyright 2016-2019, Pulumi Corporation

using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
using Google.Protobuf.Collections;
using Google.Protobuf.WellKnownTypes;

namespace Pulumi
{
    public interface IResourcePackage
    {
        Resource Construct(string name, string type, IDictionary<string, object?>? args, string urn);
        ProviderResource ConstructProvider(string name, string type, IDictionary<string, object?>? args, string urn);
    }

    internal static class ResourcePackages
    {
        internal static ConcurrentDictionary<string, IResourcePackage> _resourcePackages = new ConcurrentDictionary<string, IResourcePackage>();

        private static string PackageKey(string name, string version)
        {
            return $"{name}@{version}";
        }

        internal static bool TryGetResourcePackage(string name, string version, [NotNullWhen(true)] out IResourcePackage? package)
        {
            return _resourcePackages.TryGetValue(PackageKey(name, version), out package);
        }

        public static void RegisterResourcePackage(string name, string version, IResourcePackage package)
        {
            var key = PackageKey(name, version);
            if (!_resourcePackages.TryAdd(key, package))
            {
                throw new InvalidOperationException($"Cannot re-register package {key}.");
            }
        }
    }
}