package tests

import (
	"context"
	"fmt"
	"omega-server/local/model"
	"omega-server/local/utl/logging"
	"os"
	"testing"

	"go.uber.org/dig"
	"gorm.io/driver/postgres"
	"gorm.io/gorm"
	"gorm.io/gorm/logger"
)

// TestConfig holds configuration for testing
type TestConfig struct {
	DBHost     string
	DBPort     string
	DBUser     string
	DBPassword string
	DBName     string
	DBSSLMode  string
}

// TestSuite provides a base structure for test suites
type TestSuite struct {
	DB     *gorm.DB
	DI     *dig.Container
	Config *TestConfig
}

// NewTestSuite creates a new test suite
func NewTestSuite() *TestSuite {
	config := &TestConfig{
		DBHost:     getEnvOrDefault("TEST_DB_HOST", "localhost"),
		DBPort:     getEnvOrDefault("TEST_DB_PORT", "5432"),
		DBUser:     getEnvOrDefault("TEST_DB_USER", "postgres"),
		DBPassword: getEnvOrDefault("TEST_DB_PASSWORD", "password"),
		DBName:     getEnvOrDefault("TEST_DB_NAME", "omega_test"),
		DBSSLMode:  getEnvOrDefault("TEST_DB_SSL_MODE", "disable"),
	}

	return &TestSuite{
		Config: config,
		DI:     dig.New(),
	}
}

// Setup initializes the test environment
func (ts *TestSuite) Setup(t *testing.T) {
	// Initialize logger for tests
	logger, err := logging.Initialize()
	if err != nil {
		t.Fatalf("Failed to initialize logger: %v", err)
	}
	defer logger.Close()

	// Setup test database
	ts.setupTestDatabase(t)

	// Setup dependency injection
	ts.setupDI(t)

	// Migrate database
	ts.migrateDatabase(t)
}

// Teardown cleans up the test environment
func (ts *TestSuite) Teardown(t *testing.T) {
	if ts.DB != nil {
		// Clean up test data
		ts.cleanupDatabase(t)

		// Close database connection
		sqlDB, err := ts.DB.DB()
		if err == nil {
			sqlDB.Close()
		}
	}
}

// setupTestDatabase initializes the test database connection
func (ts *TestSuite) setupTestDatabase(t *testing.T) {
	dsn := fmt.Sprintf("host=%s user=%s password=%s dbname=%s port=%s sslmode=%s TimeZone=UTC",
		ts.Config.DBHost,
		ts.Config.DBUser,
		ts.Config.DBPassword,
		ts.Config.DBName,
		ts.Config.DBPort,
		ts.Config.DBSSLMode,
	)

	// Use silent logger for tests
	gormLogger := logger.Default.LogMode(logger.Silent)

	db, err := gorm.Open(postgres.Open(dsn), &gorm.Config{
		Logger: gormLogger,
	})
	if err != nil {
		t.Skipf("Failed to connect to test database: %v", err)
	}

	ts.DB = db
}

// setupDI initializes dependency injection for tests
func (ts *TestSuite) setupDI(t *testing.T) {
	err := ts.DI.Provide(func() *gorm.DB {
		return ts.DB
	})
	if err != nil {
		t.Fatalf("Failed to provide database to DI: %v", err)
	}
}

// migrateDatabase runs database migrations for tests
func (ts *TestSuite) migrateDatabase(t *testing.T) {
	err := ts.DB.AutoMigrate(
		&model.User{},
		&model.Role{},
		&model.Permission{},
		&model.Type{},
		&model.Project{},
		&model.Task{},
		&model.Integration{},
		&model.ProjectMember{},
		&model.TaskAssignee{},
		&model.SystemConfig{},
		&model.AuditLog{},
		&model.SecurityEvent{},
	)
	if err != nil {
		t.Fatalf("Failed to migrate test database: %v", err)
	}
}

// cleanupDatabase cleans up test data
func (ts *TestSuite) cleanupDatabase(t *testing.T) {
	// Clean up in reverse order of dependencies
	tables := []string{
		"task_assignees",
		"project_members",
		"integrations",
		"tasks",
		"projects",
		"types",
		"user_roles",
		"role_permissions",
		"users",
		"roles",
		"permissions",
		"system_configs",
		"audit_logs",
		"security_events",
	}

	for _, table := range tables {
		err := ts.DB.Exec(fmt.Sprintf("TRUNCATE TABLE %s RESTART IDENTITY CASCADE", table)).Error
		if err != nil {
			t.Logf("Warning: Failed to truncate table %s: %v", table, err)
		}
	}
}

// CreateTestUser creates a test user
func (ts *TestSuite) CreateTestUser(t *testing.T, email, fullName string) *model.User {
	user := &model.User{
		Email:    email,
		FullName: fullName,
	}
	user.Init()

	err := user.SetPassword("testpassword123")
	if err != nil {
		t.Fatalf("Failed to set password for test user: %v", err)
	}

	err = ts.DB.Create(user).Error
	if err != nil {
		t.Fatalf("Failed to create test user: %v", err)
	}

	return user
}

// CreateTestRole creates a test role
func (ts *TestSuite) CreateTestRole(t *testing.T, name, description string) *model.Role {
	role := &model.Role{
		Name:        name,
		Description: description,
		Active:      true,
	}
	role.Init()

	err := ts.DB.Create(role).Error
	if err != nil {
		t.Fatalf("Failed to create test role: %v", err)
	}

	return role
}

// CreateTestPermission creates a test permission
func (ts *TestSuite) CreateTestPermission(t *testing.T, name, description, category string) *model.Permission {
	permission := &model.Permission{
		Name:        name,
		Description: description,
		Category:    category,
		Active:      true,
	}
	permission.Init()

	err := ts.DB.Create(permission).Error
	if err != nil {
		t.Fatalf("Failed to create test permission: %v", err)
	}

	return permission
}

// CreateTestType creates a test project type
func (ts *TestSuite) CreateTestType(t *testing.T, name, description string, userID *string) *model.Type {
	projectType := &model.Type{
		Name:        name,
		Description: description,
		UserID:      userID,
	}
	projectType.Init()

	err := ts.DB.Create(projectType).Error
	if err != nil {
		t.Fatalf("Failed to create test type: %v", err)
	}

	return projectType
}

// CreateTestProject creates a test project
func (ts *TestSuite) CreateTestProject(t *testing.T, name, description, ownerID, typeID string) *model.Project {
	project := &model.Project{
		Name:        name,
		Description: description,
		OwnerID:     ownerID,
		TypeID:      typeID,
	}
	project.Init()

	err := ts.DB.Create(project).Error
	if err != nil {
		t.Fatalf("Failed to create test project: %v", err)
	}

	return project
}

// CreateTestTask creates a test task
func (ts *TestSuite) CreateTestTask(t *testing.T, title, description, projectID string) *model.Task {
	task := &model.Task{
		Title:       title,
		Description: description,
		Status:      model.TaskStatusTodo,
		Priority:    model.TaskPriorityMedium,
		ProjectID:   projectID,
	}
	task.Init()

	err := ts.DB.Create(task).Error
	if err != nil {
		t.Fatalf("Failed to create test task: %v", err)
	}

	return task
}

// WithTransaction runs a function within a database transaction
func (ts *TestSuite) WithTransaction(t *testing.T, fn func(tx *gorm.DB) error) {
	tx := ts.DB.Begin()
	defer func() {
		if r := recover(); r != nil {
			tx.Rollback()
			t.Fatalf("Transaction panicked: %v", r)
		}
	}()

	if err := fn(tx); err != nil {
		tx.Rollback()
		t.Fatalf("Transaction failed: %v", err)
	}

	if err := tx.Commit().Error; err != nil {
		t.Fatalf("Failed to commit transaction: %v", err)
	}
}

// AssertUserExists asserts that a user exists in the database
func (ts *TestSuite) AssertUserExists(t *testing.T, email string) *model.User {
	var user model.User
	err := ts.DB.Where("email = ?", email).First(&user).Error
	if err != nil {
		t.Fatalf("Expected user with email %s to exist, but not found: %v", email, err)
	}
	return &user
}

// AssertUserNotExists asserts that a user does not exist in the database
func (ts *TestSuite) AssertUserNotExists(t *testing.T, email string) {
	var user model.User
	err := ts.DB.Where("email = ?", email).First(&user).Error
	if err == nil {
		t.Fatalf("Expected user with email %s to not exist, but found: %+v", email, user)
	}
}

// AssertProjectExists asserts that a project exists in the database
func (ts *TestSuite) AssertProjectExists(t *testing.T, name string) *model.Project {
	var project model.Project
	err := ts.DB.Where("name = ?", name).First(&project).Error
	if err != nil {
		t.Fatalf("Expected project with name %s to exist, but not found: %v", name, err)
	}
	return &project
}

// AssertTaskExists asserts that a task exists in the database
func (ts *TestSuite) AssertTaskExists(t *testing.T, title string) *model.Task {
	var task model.Task
	err := ts.DB.Where("title = ?", title).First(&task).Error
	if err != nil {
		t.Fatalf("Expected task with title %s to exist, but not found: %v", title, err)
	}
	return &task
}

// TestContext creates a test context
func (ts *TestSuite) TestContext() context.Context {
	return context.Background()
}

// getEnvOrDefault returns environment variable value or default
func getEnvOrDefault(key, defaultValue string) string {
	if value := os.Getenv(key); value != "" {
		return value
	}
	return defaultValue
}

// SkipIfNoTestDB skips test if test database is not available
func (ts *TestSuite) SkipIfNoTestDB(t *testing.T) {
	if ts.DB == nil {
		t.Skip("Test database not available, skipping test")
	}
}

// RunInTestTransaction runs a test function in a transaction that gets rolled back
func (ts *TestSuite) RunInTestTransaction(t *testing.T, testFn func(tx *gorm.DB)) {
	tx := ts.DB.Begin()
	defer tx.Rollback()

	testFn(tx)
}