package testutil

import (
	"context"
	"log"
	"os"
	"path/filepath"
	"tercul/internal/app"
	"tercul/internal/app/analytics"
	"tercul/internal/app/translation"
	"tercul/internal/data/sql"
	"tercul/internal/domain"
	"tercul/internal/domain/search"
	platform_auth "tercul/internal/platform/auth"
	"tercul/internal/domain/work"
	"tercul/internal/jobs/linguistics"
	"time"

	"github.com/stretchr/testify/suite"
	"gorm.io/driver/sqlite"
	"gorm.io/gorm"
	"gorm.io/gorm/logger"
)

// mockSearchClient is a mock implementation of the SearchClient interface.
type mockSearchClient struct{}

func (m *mockSearchClient) IndexWork(ctx context.Context, work *work.Work, pipeline string) error {
	return nil
}

// mockAnalyticsService is a mock implementation of the AnalyticsService interface.
type mockAnalyticsService struct{}

func (m *mockAnalyticsService) IncrementWorkViews(ctx context.Context, workID uint) error { return nil }
func (m *mockAnalyticsService) IncrementWorkLikes(ctx context.Context, workID uint) error { return nil }
func (m *mockAnalyticsService) IncrementWorkComments(ctx context.Context, workID uint) error {
	return nil
}
func (m *mockAnalyticsService) IncrementWorkBookmarks(ctx context.Context, workID uint) error {
	return nil
}
func (m *mockAnalyticsService) IncrementWorkShares(ctx context.Context, workID uint) error { return nil }
func (m *mockAnalyticsService) IncrementWorkTranslationCount(ctx context.Context, workID uint) error {
	return nil
}
func (m *mockAnalyticsService) IncrementTranslationViews(ctx context.Context, translationID uint) error {
	return nil
}
func (m *mockAnalyticsService) IncrementTranslationLikes(ctx context.Context, translationID uint) error {
	return nil
}
func (m *mockAnalyticsService) IncrementTranslationComments(ctx context.Context, translationID uint) error {
	return nil
}
func (m *mockAnalyticsService) IncrementTranslationShares(ctx context.Context, translationID uint) error {
	return nil
}
func (m *mockAnalyticsService) GetOrCreateWorkStats(ctx context.Context, workID uint) (*work.WorkStats, error) {
	return &work.WorkStats{}, nil
}
func (m *mockAnalyticsService) GetOrCreateTranslationStats(ctx context.Context, translationID uint) (*domain.TranslationStats, error) {
	return &domain.TranslationStats{}, nil
}
func (m *mockAnalyticsService) UpdateWorkReadingTime(ctx context.Context, workID uint) error { return nil }
func (m *mockAnalyticsService) UpdateWorkComplexity(ctx context.Context, workID uint) error  { return nil }
func (m *mockAnalyticsService) UpdateWorkSentiment(ctx context.Context, workID uint) error   { return nil }
func (m *mockAnalyticsService) UpdateTranslationReadingTime(ctx context.Context, translationID uint) error {
	return nil
}
func (m *mockAnalyticsService) UpdateTranslationSentiment(ctx context.Context, translationID uint) error {
	return nil
}
func (m *mockAnalyticsService) UpdateUserEngagement(ctx context.Context, userID uint, eventType string) error {
	return nil
}
func (m *mockAnalyticsService) UpdateTrending(ctx context.Context) error { return nil }
func (m *mockAnalyticsService) GetTrendingWorks(ctx context.Context, timePeriod string, limit int) ([]*work.Work, error) {
	return nil, nil
}

// IntegrationTestSuite provides a comprehensive test environment with either in-memory SQLite or mock repositories
type IntegrationTestSuite struct {
	suite.Suite
	App      *app.Application
	DB       *gorm.DB
	AdminCtx context.Context
}

// TestConfig holds configuration for the test environment
type TestConfig struct {
	UseInMemoryDB bool   // If true, use SQLite in-memory, otherwise use mock repositories
	DBPath        string // Path for SQLite file (only used if UseInMemoryDB is false)
	LogLevel      logger.LogLevel
}

// DefaultTestConfig returns a default test configuration
func DefaultTestConfig() *TestConfig {
	// Using a file-based DB is more stable for integration tests across multiple packages
	// than the in-memory one, which can behave unpredictably with `go test ./...`
	return &TestConfig{
		UseInMemoryDB: false,
		DBPath:        "test.db",
		LogLevel:      logger.Silent,
	}
}

// SetupSuite sets up the test suite with the specified configuration
func (s *IntegrationTestSuite) SetupSuite(config *TestConfig) {
	if config == nil {
		config = DefaultTestConfig()
	}

	var dbPath string
	if !config.UseInMemoryDB && config.DBPath != "" {
		// Clean up previous test database file before starting
		_ = os.Remove(config.DBPath)
		// Ensure directory exists
		dir := filepath.Dir(config.DBPath)
		if err := os.MkdirAll(dir, 0755); err != nil {
			s.T().Fatalf("Failed to create database directory: %v", err)
		}
		dbPath = config.DBPath
	} else {
		// Use in-memory database
		dbPath = ":memory:"
	}

	// Custom logger for tests
	newLogger := logger.New(
		log.New(os.Stdout, "\r\n", log.LstdFlags),
		logger.Config{
			SlowThreshold:             time.Second,
			LogLevel:                  config.LogLevel,
			IgnoreRecordNotFoundError: true,
			Colorful:                  false,
		},
	)

	db, err := gorm.Open(sqlite.Open(dbPath), &gorm.Config{
		Logger: newLogger,
	})
	if err != nil {
		s.T().Fatalf("Failed to connect to test database: %v", err)
	}

	s.DB = db
	db.AutoMigrate(
		&work.Work{}, &domain.User{}, &domain.Author{}, &domain.Translation{},
		&domain.Comment{}, &domain.Like{}, &domain.Bookmark{}, &domain.Collection{},
		&domain.Tag{}, &domain.Category{}, &domain.Book{}, &domain.Publisher{},
		&domain.Source{}, &domain.Copyright{}, &domain.Monetization{},
		&work.WorkStats{}, &domain.Trending{}, &domain.UserSession{}, &domain.Localization{},
		&domain.LanguageAnalysis{}, &domain.TextMetadata{}, &domain.ReadabilityScore{},
		&domain.TranslationStats{}, &TestEntity{}, &domain.CollectionWork{},
	)

	repos := sql.NewRepositories(s.DB)
	var searchClient search.SearchClient = &mockSearchClient{}
	analysisRepo := linguistics.NewGORMAnalysisRepository(s.DB)
	sentimentProvider, err := linguistics.NewGoVADERSentimentProvider()
	if err != nil {
		s.T().Fatalf("Failed to create sentiment provider: %v", err)
	}
	analyticsService := analytics.NewService(repos.Analytics, analysisRepo, repos.Translation, repos.Work, sentimentProvider)
	jwtManager := platform_auth.NewJWTManager()

	deps := app.Dependencies{
		WorkRepo:          repos.Work,
		UserRepo:          repos.User,
		AuthorRepo:        repos.Author,
		TranslationRepo:   repos.Translation,
		CommentRepo:       repos.Comment,
		LikeRepo:          repos.Like,
		BookmarkRepo:      repos.Bookmark,
		CollectionRepo:    repos.Collection,
		TagRepo:           repos.Tag,
		CategoryRepo:      repos.Category,
		BookRepo:          repos.Book,
		PublisherRepo:     repos.Publisher,
		SourceRepo:        repos.Source,
		CopyrightRepo:     repos.Copyright,
		MonetizationRepo:  repos.Monetization,
		AnalyticsRepo:     repos.Analytics,
		AuthRepo:          repos.Auth,
		LocalizationRepo:  repos.Localization,
		SearchClient:      searchClient,
		AnalyticsService:  analyticsService,
		JWTManager:        jwtManager,
	}
	s.App = app.NewApplication(deps)

	// Create a default admin user for tests
	adminUser := &domain.User{
		Username: "admin",
		Email:    "admin@test.com",
		Role:     domain.UserRoleAdmin,
		Active:   true,
	}
	_ = adminUser.SetPassword("password")
	err = s.DB.Create(adminUser).Error
	s.Require().NoError(err)
	s.AdminCtx = ContextWithClaims(context.Background(), &platform_auth.Claims{
		UserID: adminUser.ID,
		Role:   string(adminUser.Role),
	})
}

// TearDownSuite cleans up the test suite
func (s *IntegrationTestSuite) TearDownSuite() {
	if s.DB != nil {
		sqlDB, err := s.DB.DB()
		if err == nil {
			sqlDB.Close()
		}
	}
}

// SetupTest resets test data for each test
func (s *IntegrationTestSuite) SetupTest() {
	if s.DB != nil {
		// Reset database for each test
		s.DB.Exec("DELETE FROM translations")
		s.DB.Exec("DELETE FROM works")
		s.DB.Exec("DELETE FROM authors")
		s.DB.Exec("DELETE FROM users")
		s.DB.Exec("DELETE FROM trendings")
		s.DB.Exec("DELETE FROM work_stats")
		s.DB.Exec("DELETE FROM translation_stats")
	}
}

// CreateTestWork creates a test work with optional content
func (s *IntegrationTestSuite) CreateTestWork(title, language string, content string) *work.Work {
	work := &work.Work{
		Title: title,
		TranslatableModel: domain.TranslatableModel{
			Language: language,
		},
	}
	// Note: CreateWork command might not exist or need context. Assuming it does for now.
	// If CreateWork also requires auth, this context should be s.AdminCtx
	createdWork, err := s.App.Work.Commands.CreateWork(s.AdminCtx, work)
	s.Require().NoError(err)

	if content != "" {
		translationInput := translation.CreateOrUpdateTranslationInput{
			Title:              title,
			Content:            content,
			Language:           language,
			TranslatableID:     createdWork.ID,
			TranslatableType:   "works",
			IsOriginalLanguage: true, // Assuming the first one is original
		}
		_, err = s.App.Translation.Commands.CreateOrUpdateTranslation(s.AdminCtx, translationInput)
		s.Require().NoError(err)
	}
	return createdWork
}

// CreateTestTranslation creates a test translation for a work.
func (s *IntegrationTestSuite) CreateTestTranslation(workID uint, language, content string) *domain.Translation {
	translationInput := translation.CreateOrUpdateTranslationInput{
		Title:            "Test Translation",
		Content:          content,
		Language:         language,
		TranslatableID:   workID,
		TranslatableType: "works",
	}
	createdTranslation, err := s.App.Translation.Commands.CreateOrUpdateTranslation(s.AdminCtx, translationInput)
	s.Require().NoError(err)
	return createdTranslation
}

// ContextWithClaims creates a new context with the given claims.
func ContextWithClaims(ctx context.Context, claims *platform_auth.Claims) context.Context {
	return context.WithValue(ctx, platform_auth.ClaimsContextKey, claims)
}