// Copyright (c) .NET Foundation. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.

using System;
using System.Collections.Generic;
using System.Globalization;
using System.Xml.Linq;
using Microsoft.Extensions.DependencyInjection;
using Moq;
using Xunit;

namespace Microsoft.AspNetCore.DataProtection.KeyManagement
{
    public class KeyEscrowServiceProviderExtensionsTests
    {
        [Fact]
        public void GetKeyEscrowSink_NullServiceProvider_ReturnsNull()
        {
            Assert.Null(((IServiceProvider)null).GetKeyEscrowSink());
        }

        [Fact]
        public void GetKeyEscrowSink_EmptyServiceProvider_ReturnsNull()
        {
            // Arrange
            var services = new ServiceCollection().BuildServiceProvider();

            // Act & assert
            Assert.Null(services.GetKeyEscrowSink());
        }

        [Fact]
        public void GetKeyEscrowSink_SingleKeyEscrowRegistration_ReturnsAggregateOverSingleSink()
        {
            // Arrange
            List<string> output = new List<string>();

            var mockKeyEscrowSink = new Mock<IKeyEscrowSink>();
            mockKeyEscrowSink.Setup(o => o.Store(It.IsAny<Guid>(), It.IsAny<XElement>()))
                .Callback<Guid, XElement>((keyId, element) =>
                {
                    output.Add(String.Format(CultureInfo.InvariantCulture, "{0:D}: {1}", keyId, element.Name.LocalName));
                });

            var serviceCollection = new ServiceCollection();
            serviceCollection.AddSingleton<IKeyEscrowSink>(mockKeyEscrowSink.Object);
            var services = serviceCollection.BuildServiceProvider();

            // Act
            var sink = services.GetKeyEscrowSink();
            sink.Store(new Guid("39974d8e-3e53-4d78-b7e9-4ff64a2a5d7b"), XElement.Parse("<theElement />"));

            // Assert
            Assert.Equal(new[] { "39974d8e-3e53-4d78-b7e9-4ff64a2a5d7b: theElement" }, output);
        }

        [Fact]
        public void GetKeyEscrowSink_MultipleKeyEscrowRegistration_ReturnsAggregate()
        {
            // Arrange
            List<string> output = new List<string>();

            var mockKeyEscrowSink1 = new Mock<IKeyEscrowSink>();
            mockKeyEscrowSink1.Setup(o => o.Store(It.IsAny<Guid>(), It.IsAny<XElement>()))
                .Callback<Guid, XElement>((keyId, element) =>
                {
                    output.Add(String.Format(CultureInfo.InvariantCulture, "[sink1] {0:D}: {1}", keyId, element.Name.LocalName));
                });

            var mockKeyEscrowSink2 = new Mock<IKeyEscrowSink>();
            mockKeyEscrowSink2.Setup(o => o.Store(It.IsAny<Guid>(), It.IsAny<XElement>()))
                .Callback<Guid, XElement>((keyId, element) =>
                {
                    output.Add(String.Format(CultureInfo.InvariantCulture, "[sink2] {0:D}: {1}", keyId, element.Name.LocalName));
                });

            var serviceCollection = new ServiceCollection();
            serviceCollection.AddSingleton<IKeyEscrowSink>(mockKeyEscrowSink1.Object);
            serviceCollection.AddSingleton<IKeyEscrowSink>(mockKeyEscrowSink2.Object);
            var services = serviceCollection.BuildServiceProvider();

            // Act
            var sink = services.GetKeyEscrowSink();
            sink.Store(new Guid("39974d8e-3e53-4d78-b7e9-4ff64a2a5d7b"), XElement.Parse("<theElement />"));

            // Assert
            Assert.Equal(new[] { "[sink1] 39974d8e-3e53-4d78-b7e9-4ff64a2a5d7b: theElement", "[sink2] 39974d8e-3e53-4d78-b7e9-4ff64a2a5d7b: theElement" }, output);
        }
    }
}