using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Mvc.Testing;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Configuration;
using DramaLing.Api.Data;
using DramaLing.Api.Tests.Integration.Fixtures;
using DramaLing.Api.Tests.Integration.Mocks;
using DramaLing.Api.Services.AI.Gemini;
using DramaLing.Api.Models.Configuration;

namespace DramaLing.Api.Tests.Integration;

/// <summary>
/// API 整合測試的 WebApplicationFactory
/// 提供完整的測試環境設定，包含 InMemory 資料庫和測試配置
/// </summary>
public class DramaLingWebApplicationFactory : WebApplicationFactory<Program>
{
    private readonly string _databaseName;

    public DramaLingWebApplicationFactory()
    {
        _databaseName = $"TestDb_{Guid.NewGuid()}";
    }

    protected override void ConfigureWebHost(IWebHostBuilder builder)
    {
        builder.ConfigureServices(services =>
        {
            // 移除原有的資料庫配置
            var descriptor = services.SingleOrDefault(
                d => d.ServiceType == typeof(DbContextOptions<DramaLingDbContext>));
            if (descriptor != null)
            {
                services.Remove(descriptor);
            }

            // 使用 InMemory 資料庫
            services.AddDbContext<DramaLingDbContext>(options =>
            {
                options.UseInMemoryDatabase(_databaseName);
                options.EnableSensitiveDataLogging();
            });

            // 替換 Gemini Client 為 Mock
            var geminiDescriptor = services.SingleOrDefault(
                d => d.ServiceType == typeof(IGeminiClient));
            if (geminiDescriptor != null)
            {
                services.Remove(geminiDescriptor);
            }
            services.AddScoped<IGeminiClient, MockGeminiClient>();

            // 設定測試用的 Gemini 配置
            services.Configure<GeminiOptions>(options =>
            {
                options.ApiKey = "AIza-test-key-for-integration-testing-purposes-only";
                options.BaseUrl = "https://test.googleapis.com";
                options.TimeoutSeconds = 10;
                options.MaxRetries = 1;
                options.Temperature = 0.5;
            });

            // 建立資料庫並種子資料
            var serviceProvider = services.BuildServiceProvider();
            using var scope = serviceProvider.CreateScope();
            var context = scope.ServiceProvider.GetRequiredService<DramaLingDbContext>();

            context.Database.EnsureCreated();
            TestDataSeeder.SeedTestData(context);
        });

        builder.UseEnvironment("Testing");

        // 設定測試用環境變數
        Environment.SetEnvironmentVariable("USE_INMEMORY_DB", "true");
        Environment.SetEnvironmentVariable("DRAMALING_SUPABASE_JWT_SECRET", "test-secret-minimum-32-characters-long-for-jwt-signing-in-test-mode-only");
        Environment.SetEnvironmentVariable("DRAMALING_SUPABASE_URL", "https://test.supabase.co");
        Environment.SetEnvironmentVariable("DRAMALING_GEMINI_API_KEY", "AIza-test-key-for-integration-testing-purposes-only");

        // 設定測試專用的配置
        builder.ConfigureAppConfiguration((context, config) =>
        {
            // 添加測試用的記憶體配置
            var testConfig = new Dictionary<string, string>
            {
                ["Supabase:JwtSecret"] = "test-secret-minimum-32-characters-long-for-jwt-signing-in-test-mode-only",
                ["Supabase:Url"] = "https://test.supabase.co",
                ["Gemini:ApiKey"] = "AIza-test-key-for-integration-testing-purposes-only"
            };

            config.AddInMemoryCollection(testConfig);
        });

        // 設定 Logging 層級
        builder.ConfigureLogging(logging =>
        {
            logging.ClearProviders();
            logging.AddConsole();
            logging.SetMinimumLevel(LogLevel.Warning);
        });
    }

    /// <summary>
    /// 取得測試用的 HttpClient，並設定預設的 JWT Token
    /// </summary>
    public HttpClient CreateClientWithAuth(string? token = null)
    {
        var client = CreateClient();

        if (!string.IsNullOrEmpty(token))
        {
            client.DefaultRequestHeaders.Authorization =
                new System.Net.Http.Headers.AuthenticationHeaderValue("Bearer", token);
        }

        return client;
    }

    /// <summary>
    /// 重置資料庫資料 - 用於測試間的隔離
    /// </summary>
    public void ResetDatabase()
    {
        using var scope = Services.CreateScope();
        var context = scope.ServiceProvider.GetRequiredService<DramaLingDbContext>();

        // 清除所有資料
        context.FlashcardReviews.RemoveRange(context.FlashcardReviews);
        context.Flashcards.RemoveRange(context.Flashcards);
        context.Users.RemoveRange(context.Users);
        context.OptionsVocabularies.RemoveRange(context.OptionsVocabularies);
        context.SaveChanges();

        // 重新種子測試資料
        TestDataSeeder.SeedTestData(context);
    }

    /// <summary>
    /// 取得測試資料庫上下文
    /// </summary>
    public DramaLingDbContext GetDbContext()
    {
        var scope = Services.CreateScope();
        return scope.ServiceProvider.GetRequiredService<DramaLingDbContext>();
    }
}