// 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.Utils;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Diagnostics.HealthChecks;
using Microsoft.Extensions.Hosting;
using Polly;
using StackExchange.Redis;
using Xunit;
using Xunit.Abstractions;
 
namespace Aspire.Hosting.Garnet.Tests;
 
public class GarnetFunctionalTests(ITestOutputHelper testOutputHelper)
{
    [Fact]
    [RequiresDocker]
    public async Task VerifyWaitForOnGarnetBlocksDependentResources()
    {
        var cts = new CancellationTokenSource(TimeSpan.FromMinutes(3));
        using var builder = TestDistributedApplicationBuilder.Create().WithTestAndResourceLogging(testOutputHelper);
 
        var healthCheckTcs = new TaskCompletionSource<HealthCheckResult>();
        builder.Services.AddHealthChecks().AddAsyncCheck("blocking_check", () =>
        {
            return healthCheckTcs.Task;
        });
 
        var resource = builder.AddGarnet("resource")
                              .WithHealthCheck("blocking_check");
 
        var dependentResource = builder.AddGarnet("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.WaitForResourceHealthyAsync(resource.Resource.Name, cts.Token);
 
        await rns.WaitForResourceAsync(dependentResource.Resource.Name, KnownResourceStates.Running, cts.Token);
 
        await pendingStart;
 
        await app.StopAsync();
    }
 
    [Fact]
    [RequiresDocker]
    public async Task VerifyGarnetResource()
    {
        var cts = new CancellationTokenSource(TimeSpan.FromMinutes(5));
        var pipeline = new ResiliencePipelineBuilder()
           .AddRetry(new() { MaxRetryAttempts = 10, Delay = TimeSpan.FromSeconds(3) })
           .Build();
 
        using var builder = TestDistributedApplicationBuilder.Create().WithTestAndResourceLogging(testOutputHelper);
 
        var garnet = builder.AddGarnet("garnet");
 
        using var app = builder.Build();
 
        await app.StartAsync();
 
        var hb = Host.CreateApplicationBuilder();
 
        hb.Configuration[$"ConnectionStrings:{garnet.Resource.Name}"] = await garnet.Resource.ConnectionStringExpression.GetValueAsync(default);
 
        hb.AddRedisClient(garnet.Resource.Name);
 
        using var host = hb.Build();
 
        await host.StartAsync();
 
        var redisClient = host.Services.GetRequiredService<IConnectionMultiplexer>();
 
        await pipeline.ExecuteAsync(async token =>
         {
             var db = redisClient.GetDatabase();
 
             await db.StringSetAsync("key", "value");
 
             var value = await db.StringGetAsync("key");
 
             Assert.Equal("value", value);
 
         }, cts.Token);
    }
 
    [Theory]
    [InlineData(true)]
    [InlineData(false)]
    [RequiresDocker]
    public async Task WithDataShouldPersistStateBetweenUsages(bool useVolume)
    {
        var cts = new CancellationTokenSource(TimeSpan.FromMinutes(5));
        var pipeline = new ResiliencePipelineBuilder()
                            .AddRetry(new() { MaxRetryAttempts = 10, Delay = TimeSpan.FromSeconds(10) })
                            .Build();
        string? volumeName = null;
        string? bindMountPath = null;
 
        try
        {
            var builder1 = TestDistributedApplicationBuilder.Create().WithTestAndResourceLogging(testOutputHelper);
            var garnet1 = builder1.AddGarnet("garnet");
 
            if (useVolume)
            {
                // Use a deterministic volume name to prevent them from exhausting the machines if deletion fails
                volumeName = VolumeNameGenerator.Generate(garnet1, nameof(WithDataShouldPersistStateBetweenUsages));
 
                // if the volume already exists (because of a crashing previous run), try to delete it
                DockerUtils.AttemptDeleteDockerVolume(volumeName);
                garnet1.WithDataVolume(volumeName);
            }
            else
            {
                bindMountPath = Path.Combine(Path.GetTempPath(), Path.GetRandomFileName());
 
                Directory.CreateDirectory(bindMountPath);
 
                if (!OperatingSystem.IsWindows())
                {
                    // the docker container runs as a non-root user, so we need to grant other user's read/write permission
                    // to the bind mount directory.
                    // Note that we need to do this after creating the directory, because the umask is applied at the time of creation.
                    const UnixFileMode BindMountPermissions =
                        UnixFileMode.UserRead | UnixFileMode.UserWrite | UnixFileMode.UserExecute |
                        UnixFileMode.GroupRead | UnixFileMode.GroupWrite | UnixFileMode.GroupExecute |
                        UnixFileMode.OtherRead | UnixFileMode.OtherWrite | UnixFileMode.OtherExecute;
 
                    File.SetUnixFileMode(bindMountPath, BindMountPermissions);
                }
 
                garnet1.WithDataBindMount(bindMountPath);
            }
 
            using (var app = builder1.Build())
            {
                await app.StartAsync();
                try
                {
                    var hb = Host.CreateApplicationBuilder();
 
                    hb.Configuration[$"ConnectionStrings:{garnet1.Resource.Name}"] = $"{await garnet1.Resource.ConnectionStringExpression.GetValueAsync(default)}";
 
                    hb.AddRedisClient("garnet");
 
                    using (var host = hb.Build())
                    {
                        await host.StartAsync();
 
                        await pipeline.ExecuteAsync(async token =>
                        {
                            var redisClient = host.Services.GetRequiredService<IConnectionMultiplexer>();
 
                            var db = redisClient.GetDatabase();
 
                            await db.StringSetAsync("key", "value");
                            var value = await db.StringGetAsync("key");
 
                            // Force Garnet to save the keys
                            // c.f. https://microsoft.github.io/garnet/docs/commands/checkpoint#save
                            await db.ExecuteAsync("SAVE");
 
                            Assert.Equal("value", value);
                        }, cts.Token);
                    }
                }
                finally
                {
                    // Stops the container, or the Volume/mount would still be in use
                    await app.StopAsync();
                }
            }
 
            var builder2 = TestDistributedApplicationBuilder.Create().WithTestAndResourceLogging(testOutputHelper);
            var garnet2 = builder2.AddGarnet("garnet");
 
            if (useVolume)
            {
                garnet2.WithDataVolume(volumeName);
            }
            else
            {
                garnet2.WithDataBindMount(bindMountPath!);
            }
 
            using (var app = builder2.Build())
            {
                await app.StartAsync();
                try
                {
                    var hb = Host.CreateApplicationBuilder();
 
                    hb.Configuration[$"ConnectionStrings:{garnet2.Resource.Name}"] = $"{await garnet2.Resource.ConnectionStringExpression.GetValueAsync(default)}";
 
                    hb.AddRedisClient("garnet");
 
                    using (var host = hb.Build())
                    {
                        await host.StartAsync();
 
                        await pipeline.ExecuteAsync(async token =>
                        {
                            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
                }
            }
        }
    }
}