using Microsoft.AspNetCore.Mvc.Testing;
using Microsoft.AspNetCore.TestHost;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Caching.Memory;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.DependencyInjection.Extensions;
using Xunit;
using YarpGateway.Data;
using YarpGateway.DynamicProxy;
using YarpGateway.Services;

namespace YarpGateway.Tests.Integration;

/// <summary>
/// 集成测试基类
/// 提供 WebApplicationFactory 和 HttpClient 的共享实例
/// </summary>
public class TestFixture : IAsyncLifetime
{
    public WebApplicationFactory<Program> Factory { get; private set; } = null!;
    public HttpClient Client { get; private set; } = null!;
    public IServiceProvider Services { get; private set; } = null!;

    public async Task InitializeAsync()
    {
        Factory = new WebApplicationFactory<Program>()
            .WithWebHostBuilder(builder =>
            {
                builder.UseEnvironment("Testing");
                builder.ConfigureServices(services =>
                {
                    // 移除 PostgreSQL 数据库上下文
                    var descriptor = services.SingleOrDefault(
                        d => d.ServiceType == typeof(IDbContextFactory<GatewayDbContext>));
                    if (descriptor != null)
                    {
                        services.Remove(descriptor);
                    }

                    var dbContextDescriptor = services.SingleOrDefault(
                        d => d.ServiceType == typeof(DbContextOptions<GatewayDbContext>));
                    if (dbContextDescriptor != null)
                    {
                        services.Remove(dbContextDescriptor);
                    }

                    // 使用内存数据库替换
                    services.AddDbContextFactory<GatewayDbContext>(options =>
                    {
                        options.UseInMemoryDatabase($"YarpGateway_Test_{Guid.NewGuid()}");
                    });

                    // 移除 PgSqlConfigChangeListener（因为内存数据库不支持 NOTIFY）
                    var listenerDescriptor = services.SingleOrDefault(
                        d => d.ServiceType == typeof(Microsoft.Extensions.Hosting.IHostedService) &&
                             d.ImplementationType == typeof(PgSqlConfigChangeListener));
                    if (listenerDescriptor != null)
                    {
                        services.Remove(listenerDescriptor);
                    }

                    // 移除 Redis 相关服务（测试环境不需要）
                    services.RemoveAll(typeof(StackExchange.Redis.IConnectionMultiplexer));
                    services.RemoveAll(typeof(IRedisConnectionManager));
                    
                    // 添加内存缓存
                    services.AddMemoryCache();
                    
                    // 确保 RouteCache 被正确注册
                    services.RemoveAll(typeof(IRouteCache));
                    services.AddSingleton<IRouteCache, RouteCache>();
                });
            });

        Client = Factory.CreateClient();
        Services = Factory.Services;

        // 初始化数据库种子数据
        await SeedDatabaseAsync();
    }

    public async Task DisposeAsync()
    {
        Client?.Dispose();
        if (Factory != null)
        {
            await Factory.DisposeAsync();
        }
    }

    /// <summary>
    /// 获取新的数据库上下文实例
    /// </summary>
    public GatewayDbContext CreateDbContext()
    {
        var factory = Services.GetRequiredService<IDbContextFactory<GatewayDbContext>>();
        return factory.CreateDbContext();
    }

    /// <summary>
    /// 获取 RouteCache 实例
    /// </summary>
    public IRouteCache GetRouteCache()
    {
        return Services.GetRequiredService<IRouteCache>();
    }

    /// <summary>
    /// 获取 DynamicProxyConfigProvider 实例
    /// </summary>
    public DynamicProxyConfigProvider GetConfigProvider()
    {
        return Services.GetRequiredService<DynamicProxyConfigProvider>();
    }

    /// <summary>
    /// 获取内存缓存实例
    /// </summary>
    public IMemoryCache GetMemoryCache()
    {
        return Services.GetRequiredService<IMemoryCache>();
    }

    /// <summary>
    /// 重新加载配置
    /// </summary>
    public async Task ReloadConfigurationAsync()
    {
        var routeCache = GetRouteCache();
        await routeCache.ReloadAsync();

        var configProvider = GetConfigProvider();
        configProvider.UpdateConfig();
    }

    /// <summary>
    /// 初始化数据库种子数据
    /// </summary>
    private async Task SeedDatabaseAsync()
    {
        using var scope = Services.CreateScope();
        var dbContext = scope.ServiceProvider.GetRequiredService<GatewayDbContext>();

        // 添加测试租户
        await TestData.SeedTenantsAsync(dbContext);
        
        // 添加测试路由
        await TestData.SeedRoutesAsync(dbContext);
        
        // 添加测试集群和目标
        await TestData.SeedClustersAsync(dbContext);

        await dbContext.SaveChangesAsync();

        // 初始化 RouteCache
        var routeCache = scope.ServiceProvider.GetRequiredService<IRouteCache>();
        await routeCache.InitializeAsync();

        // 初始化配置提供程序
        var configProvider = scope.ServiceProvider.GetRequiredService<DynamicProxyConfigProvider>();
        configProvider.UpdateConfig();
    }
}

/// <summary>
/// 集合定义，确保使用 TestFixture 的测试不会并行执行
/// </summary>
[CollectionDefinition("Integration Tests")]
public class IntegrationTestCollection : ICollectionFixture<TestFixture>
{
}