// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
using Aspire.Components.Common.Tests;
using Aspire.Hosting.ApplicationModel;
using Aspire.Hosting.Tests.Utils;
using Aspire.Hosting.Utils;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Diagnostics.HealthChecks;
using Microsoft.Extensions.Hosting;
using StackExchange.Redis;
using Xunit;
using Xunit.Abstractions;
 
namespace Aspire.Hosting.Valkey.Tests;
 
public class ValkeyFunctionalTests(ITestOutputHelper testOutputHelper)
{
    const string ValkeyReadyText = "Ready to accept connections";
 
    [Fact]
    [RequiresDocker]
    public async Task VerifyValkeyResource()
    {
        using var builder = TestDistributedApplicationBuilder.CreateWithTestContainerRegistry(testOutputHelper);
 
        var valkey = builder.AddValkey("valkey");
 
        using var app = builder.Build();
 
        await app.StartAsync();
 
        var hb = Host.CreateApplicationBuilder();
 
        hb.Configuration.AddInMemoryCollection(new Dictionary<string, string?>
        {
            [$"ConnectionStrings:{valkey.Resource.Name}"] = await valkey.Resource.ConnectionStringExpression.GetValueAsync(default)
        });
 
        hb.AddRedisClient(valkey.Resource.Name);
 
        using var host = hb.Build();
 
        await host.StartAsync();
 
        await app.WaitForTextAsync(ValkeyReadyText);
 
        var redisClient = host.Services.GetRequiredService<IConnectionMultiplexer>();
 
        var db = redisClient.GetDatabase();
 
        await db.StringSetAsync("key", "value");
 
        var value = await db.StringGetAsync("key");
 
        Assert.Equal("value", value);
    }
 
    [Theory]
    [InlineData(true)]
    [InlineData(false)]
    [RequiresDocker]
    public async Task WithDataShouldPersistStateBetweenUsages(bool useVolume)
    {
        string? volumeName = null;
        string? bindMountPath = null;
 
        try
        {
            using var builder1 = TestDistributedApplicationBuilder.CreateWithTestContainerRegistry(testOutputHelper);
            var valkey1 = builder1.AddValkey("valkey");
 
            if (useVolume)
            {
                // Use a deterministic volume name to prevent them from exhausting the machines if deletion fails
                volumeName = VolumeNameGenerator.CreateVolumeName(valkey1, nameof(WithDataShouldPersistStateBetweenUsages));
 
                // if the volume already exists (because of a crashing previous run), delete it
                DockerUtils.AttemptDeleteDockerVolume(volumeName, throwOnFailure: true);
                valkey1.WithDataVolume(volumeName);
            }
            else
            {
                bindMountPath = Path.Combine(Path.GetTempPath(), Path.GetRandomFileName());
                valkey1.WithDataBindMount(bindMountPath);
            }
 
            using (var app = builder1.Build())
            {
                await app.StartAsync();
                try
                {
                    var hb = Host.CreateApplicationBuilder();
 
                    // BGSAVE is only available in admin mode, enable it for this instance
                    hb.Configuration.AddInMemoryCollection(new Dictionary<string, string?>
                    {
                        [$"ConnectionStrings:{valkey1.Resource.Name}"] = $"{await valkey1.Resource.ConnectionStringExpression.GetValueAsync(default)},allowAdmin=true"
                    });
 
                    hb.AddRedisClient(valkey1.Resource.Name);
 
                    using (var host = hb.Build())
                    {
                        await host.StartAsync();
 
                        await app.WaitForTextAsync(ValkeyReadyText);
 
                        var redisClient = host.Services.GetRequiredService<IConnectionMultiplexer>();
 
                        var db = redisClient.GetDatabase();
 
                        await db.StringSetAsync("key", "value");
 
                        // Force Redis to save the keys (snapshotting)
                        // c.f. https://redis.io/docs/latest/operate/oss_and_stack/management/persistence/
 
                        await redisClient.GetServers().First().SaveAsync(SaveType.BackgroundSave);
                    }
                }
                finally
                {
                    // Stops the container, or the Volume/mount would still be in use
                    await app.StopAsync();
                }
            }
 
            using var builder2 = TestDistributedApplicationBuilder.CreateWithTestContainerRegistry(testOutputHelper);
            var valkey2 = builder2.AddValkey("valkey");
 
            if (useVolume)
            {
                valkey2.WithDataVolume(volumeName);
            }
            else
            {
                valkey2.WithDataBindMount(bindMountPath!);
            }
 
            using (var app = builder2.Build())
            {
                await app.StartAsync();
                try
                {
                    var hb = Host.CreateApplicationBuilder();
 
                    hb.Configuration.AddInMemoryCollection(new Dictionary<string, string?>
                    {
                        [$"ConnectionStrings:{valkey2.Resource.Name}"] = await valkey2.Resource.ConnectionStringExpression.GetValueAsync(default)
                    });
 
                    hb.AddRedisClient(valkey2.Resource.Name);
 
                    using (var host = hb.Build())
                    {
                        await host.StartAsync();
 
                        await app.WaitForTextAsync(ValkeyReadyText);
 
                        var redisClient = host.Services.GetRequiredService<IConnectionMultiplexer>();
 
                        var db = redisClient.GetDatabase();
 
                        var value = await db.StringGetAsync("key");
 
                        Assert.Equal("value", value);
                    }
                }
                finally
                {
                    // Stops the container, or the Volume/mount would still be in use
                    await app.StopAsync();
                }
            }
        }
        finally
        {
            if (volumeName is not null)
            {
                DockerUtils.AttemptDeleteDockerVolume(volumeName);
            }
 
            if (bindMountPath is not null)
            {
                try
                {
                    Directory.Delete(bindMountPath, recursive: true);
                }
                catch
                {
                    // Don't fail test if we can't clean the temporary folder
                }
            }
        }
    }
 
    [Fact]
    [RequiresDocker]
    public async Task VerifyWaitForOnValkeyBlocksDependentResources()
    {
        var cts = new CancellationTokenSource(TimeSpan.FromMinutes(3));
        using var builder = TestDistributedApplicationBuilder.CreateWithTestContainerRegistry(testOutputHelper);
 
        var healthCheckTcs = new TaskCompletionSource<HealthCheckResult>();
        builder.Services.AddHealthChecks().AddAsyncCheck("blocking_check", () =>
        {
            return healthCheckTcs.Task;
        });
 
        var resource = builder.AddValkey("resource")
                              .WithHealthCheck("blocking_check");
 
        var dependentResource = builder.AddValkey("dependentresource")
                                       .WaitFor(resource);
 
        using var app = builder.Build();
 
        var pendingStart = app.StartAsync(cts.Token);
 
        var rns = app.Services.GetRequiredService<ResourceNotificationService>();
 
        await rns.WaitForResourceAsync(resource.Resource.Name, KnownResourceStates.Running, cts.Token);
 
        await rns.WaitForResourceAsync(dependentResource.Resource.Name, KnownResourceStates.Waiting, cts.Token);
 
        healthCheckTcs.SetResult(HealthCheckResult.Healthy());
 
        await rns.WaitForResourceAsync(resource.Resource.Name, (re => re.Snapshot.HealthStatus == HealthStatus.Healthy), cts.Token);
 
        await rns.WaitForResourceAsync(dependentResource.Resource.Name, KnownResourceStates.Running, cts.Token);
 
        await pendingStart;
 
        await app.StopAsync();
    }
}