using System;
using Microsoft.Extensions.Caching.Hybrid;
using Moq;
using NUnit.Framework;
using Umbraco.Cms.Infrastructure.HybridCache;
using Umbraco.Cms.Infrastructure.HybridCache.Extensions;

namespace Umbraco.Cms.Tests.UnitTests.Umbraco.PublishedCache.HybridCache.Extensions;

/// <summary>
/// Provides tests to cover the <see cref="HybridCacheExtensions"/> class.
/// </summary>
/// <remarks>
/// Hat-tip: https://github.com/dotnet/aspnetcore/discussions/57191
/// </remarks>
[TestFixture]
public class HybridCacheExtensionsTests
{
    private Mock<Microsoft.Extensions.Caching.Hybrid.HybridCache> _cacheMock;

    [SetUp]
    public void TestInitialize()
    {
        _cacheMock = new Mock<Microsoft.Extensions.Caching.Hybrid.HybridCache>();
    }

    [Test]
    public async Task ExistsAsync_WhenKeyExists_ShouldReturnTrue()
    {
        // Arrange
        string key = "test-key";
        var expectedValue = new ContentCacheNode { Id = 1234 };

        _cacheMock
            .Setup(cache => cache.GetOrCreateAsync(
                key,
                It.IsAny<Func<CancellationToken, ValueTask<ContentCacheNode?>>>(),
                It.IsAny<Func<Func<CancellationToken, ValueTask<ContentCacheNode?>>, CancellationToken, ValueTask<ContentCacheNode?>>>(),
                It.IsAny<HybridCacheEntryOptions>(),
                null,
                CancellationToken.None))
            .ReturnsAsync(expectedValue);

        // Act
        var exists = await HybridCacheExtensions.ExistsAsync<ContentCacheNode?>(_cacheMock.Object, key, CancellationToken.None);

        // Assert
        Assert.IsTrue(exists);
    }

    [Test]
    public async Task ExistsAsync_WhenKeyDoesNotExist_ShouldReturnFalse()
    {
        // Arrange
        string key = "test-key";

        _cacheMock
            .Setup(cache => cache.GetOrCreateAsync(
                key,
                It.IsAny<Func<CancellationToken, ValueTask<ContentCacheNode?>>>(),
                It.IsAny<Func<Func<CancellationToken, ValueTask<ContentCacheNode?>>, CancellationToken, ValueTask<ContentCacheNode?>>>(),
                It.IsAny<HybridCacheEntryOptions>(),
                null,
                CancellationToken.None))
            .Returns((
                string key,
                Func<CancellationToken, ValueTask<ContentCacheNode?>> state,
                Func<Func<CancellationToken, ValueTask<ContentCacheNode?>>, CancellationToken, ValueTask<ContentCacheNode?>> factory,
                HybridCacheEntryOptions? options,
                IEnumerable<string>? tags,
                CancellationToken token) =>
            {
                return factory(state, token);
            });

        // Act
        var exists = await HybridCacheExtensions.ExistsAsync<ContentCacheNode?>(_cacheMock.Object, key, CancellationToken.None);

        // Assert
        Assert.IsFalse(exists);
    }

    [Test]
    public async Task TryGetValueAsync_WhenKeyExists_ShouldReturnTrueAndValueAsString()
    {
        // Arrange
        string key = "test-key";
        var expectedValue = "test-value";

        _cacheMock
            .Setup(cache => cache.GetOrCreateAsync(
                key,
                It.IsAny<Func<CancellationToken, ValueTask<string>>>(),
                It.IsAny<Func<Func<CancellationToken, ValueTask<string>>, CancellationToken, ValueTask<string>>>(),
                It.IsAny<HybridCacheEntryOptions>(),
                null,
                CancellationToken.None))
            .ReturnsAsync(expectedValue);

        // Act
        var (exists, value) = await HybridCacheExtensions.TryGetValueAsync<string>(_cacheMock.Object, key, CancellationToken.None);

        // Assert
        Assert.IsTrue(exists);
        Assert.AreEqual(expectedValue, value);
    }

    [Test]
    public async Task TryGetValueAsync_WhenKeyExists_ShouldReturnTrueAndValueAsInteger()
    {
        // Arrange
        string key = "test-key";
        var expectedValue = 5;

        _cacheMock
            .Setup(cache => cache.GetOrCreateAsync(
                key,
                It.IsAny<Func<CancellationToken, ValueTask<int>>>(),
                It.IsAny<Func<Func<CancellationToken, ValueTask<int>>, CancellationToken, ValueTask<int>>>(),
                It.IsAny<HybridCacheEntryOptions>(),
                null,
                CancellationToken.None))
            .ReturnsAsync(expectedValue);

        // Act
        var (exists, value) = await HybridCacheExtensions.TryGetValueAsync<int>(_cacheMock.Object, key, CancellationToken.None);

        // Assert
        Assert.IsTrue(exists);
        Assert.AreEqual(expectedValue, value);
    }

    [Test]
    public async Task TryGetValueAsync_WhenKeyExistsButValueIsNull_ShouldReturnTrueAndNullValue()
    {
        // Arrange
        string key = "test-key";

        _cacheMock
            .Setup(cache => cache.GetOrCreateAsync(
                key,
                It.IsAny<Func<CancellationToken, ValueTask<object>>>(),
                It.IsAny<Func<Func<CancellationToken, ValueTask<object>>, CancellationToken, ValueTask<object>>>(),
                It.IsAny<HybridCacheEntryOptions>(),
                null,
                CancellationToken.None))
            .ReturnsAsync(null!);

        // Act
        var (exists, value) = await HybridCacheExtensions.TryGetValueAsync<int?>(_cacheMock.Object, key, CancellationToken.None);

        // Assert
        Assert.IsTrue(exists);
        Assert.IsNull(value);
    }

    [Test]
    public async Task TryGetValueAsync_WhenKeyDoesNotExist_ShouldReturnFalseAndNull()
    {
        // Arrange
        string key = "test-key";

        _cacheMock.Setup(cache => cache.GetOrCreateAsync(
                key,
                It.IsAny<Func<CancellationToken, ValueTask<object>>>(),
                It.IsAny<Func<Func<CancellationToken, ValueTask<object>>, CancellationToken, ValueTask<object>>>(),
                It.IsAny<HybridCacheEntryOptions>(),
                null,
                CancellationToken.None))
            .Returns((
                string key,
                Func<CancellationToken, ValueTask<object>> state,
                Func<Func<CancellationToken, ValueTask<object>>, CancellationToken, ValueTask<object>> factory,
                HybridCacheEntryOptions? options,
                IEnumerable<string>? tags,
                CancellationToken token) =>
            {
                return factory(state, token);
            });

        // Act
        var (exists, value) = await HybridCacheExtensions.TryGetValueAsync<object>(_cacheMock.Object, key, CancellationToken.None);

        // Assert
        Assert.IsFalse(exists);
        Assert.IsNull(value);
    }
}