using DramaLing.Api.Tests.Integration.Fixtures;
using System.Net;

namespace DramaLing.Api.Tests.Integration;

/// <summary>
/// 測試框架驗證測試
/// 確保整合測試基礎設施正常工作
/// </summary>
public class FrameworkTests : IntegrationTestBase
{
    public FrameworkTests(DramaLingWebApplicationFactory factory) : base(factory)
    {
    }

    [Fact]
    public async Task WebApplicationFactory_ShouldStartSuccessfully()
    {
        // Arrange & Act
        var response = await HttpClient.GetAsync("/");

        // Assert
        // 不期望特定狀態碼，只要應用程式能啟動即可
        response.Should().NotBeNull();
    }

    [Fact]
    public void TestDataSeeder_ShouldCreateConsistentTestData()
    {
        // Arrange & Act
        using var context = GetDbContext();

        // Assert
        var users = context.Users.ToList();
        users.Should().HaveCount(2);
        users.Should().Contain(u => u.Id == TestDataSeeder.TestUser1Id);
        users.Should().Contain(u => u.Id == TestDataSeeder.TestUser2Id);

        var flashcards = context.Flashcards.ToList();
        flashcards.Should().HaveCount(3);
        flashcards.Should().Contain(f => f.Id == TestDataSeeder.TestFlashcard1Id);

        var reviews = context.FlashcardReviews.ToList();
        reviews.Should().HaveCount(2);
        reviews.Should().OnlyContain(r => r.UserId == TestDataSeeder.TestUser1Id);
    }

    [Fact]
    public void JwtTestHelper_ShouldGenerateValidTokens()
    {
        // Arrange
        var userId = TestDataSeeder.TestUser1Id;

        // Act
        var token = JwtTestHelper.GenerateJwtToken(userId, "test@example.com", "testuser");

        // Assert
        token.Should().NotBeNullOrEmpty();

        var principal = JwtTestHelper.ValidateToken(token);
        principal.Should().NotBeNull();
        principal!.FindFirst("sub")?.Value.Should().Be(userId.ToString());
    }

    [Fact]
    public void JwtTestHelper_ShouldGenerateTokensWithCorrectClaims()
    {
        // Arrange
        var userId = TestDataSeeder.TestUser1Id;

        // Act
        var token = JwtTestHelper.GenerateJwtToken(userId, "test@example.com", "testuser");

        // Assert
        token.Should().NotBeNullOrEmpty();

        var principal = JwtTestHelper.ValidateToken(token);
        principal.Should().NotBeNull();
        principal!.FindFirst("sub")?.Value.Should().Be(userId.ToString());
        principal!.FindFirst("email")?.Value.Should().Be("test@example.com");
        principal!.FindFirst("preferred_username")?.Value.Should().Be("testuser");
    }

    [Fact]
    public void JwtTestHelper_ShouldDetectInvalidSignature()
    {
        // Arrange
        var userId = TestDataSeeder.TestUser1Id;

        // Act
        var invalidToken = JwtTestHelper.GenerateInvalidSignatureToken(userId);

        // Assert
        invalidToken.Should().NotBeNullOrEmpty();

        var principal = JwtTestHelper.ValidateToken(invalidToken);
        principal.Should().BeNull("因為簽章無效");
    }

    [Fact]
    public async Task CreateAuthenticatedClient_ShouldWorkCorrectly()
    {
        // Arrange
        var userId = TestDataSeeder.TestUser1Id;
        var authenticatedClient = CreateAuthenticatedClient(userId);

        // Act
        var response = await authenticatedClient.GetAsync("/");

        // Assert
        response.Should().NotBeNull();
        authenticatedClient.DefaultRequestHeaders.Authorization.Should().NotBeNull();
        authenticatedClient.DefaultRequestHeaders.Authorization!.Scheme.Should().Be("Bearer");
    }

    [Fact]
    public void DatabaseReset_ShouldWorkBetweenTests()
    {
        // Arrange
        using var context = GetDbContext();
        var initialUserCount = context.Users.Count();

        // Act
        ResetDatabase();

        // Assert
        using var newContext = GetDbContext();
        var afterResetUserCount = newContext.Users.Count();
        afterResetUserCount.Should().Be(initialUserCount, "資料庫重置後應該還原到初始狀態");
    }

    [Fact]
    public async Task SendRequestExpectingError_ShouldHandleErrorResponsesCorrectly()
    {
        // Arrange
        var nonExistentEndpoint = "/api/nonexistent";

        // Act
        var response = await SendRequestExpectingError(HttpMethod.Get, nonExistentEndpoint);

        // Assert
        response.StatusCode.Should().Be(HttpStatusCode.NotFound);
    }
}