package app

import (
	"fmt"

	"gorm.io/gorm"

	"github.com/dhao2001/mygo/internal/config"
	"github.com/dhao2001/mygo/internal/repository"
	"github.com/dhao2001/mygo/internal/service"
)

// WebApp contains application-wide runtime dependencies and metadata.
type WebApp struct {
	Config  *config.Config
	Version string

	DB             *gorm.DB
	UserRepo       repository.UserRepository
	SessionRepo    repository.SessionRepository
	FileRepo       repository.FileRepository
	CredentialRepo repository.CredentialRepository
	AuthService    *service.AuthService
}

// Bootstrap creates a fully initialized WebApp from config.
// It opens the database, runs migrations, and wires all repositories and services.
func Bootstrap(cfg *config.Config) (*WebApp, error) {
	db, err := repository.Open(cfg.Database)
	if err != nil {
		return nil, fmt.Errorf("open database: %w", err)
	}

	if err := repository.AutoMigrate(db); err != nil {
		return nil, fmt.Errorf("migrate database: %w", err)
	}

	userRepo := repository.NewUserRepository(db)
	sessionRepo := repository.NewSessionRepository(db)
	fileRepo := repository.NewFileRepository(db)
	credentialRepo := repository.NewCredentialRepository(db)

	jwtSecret := []byte(cfg.JWT.Secret)
	authService := service.NewAuthService(
		userRepo, sessionRepo, credentialRepo,
		jwtSecret,
		cfg.JWT.AccessDuration(),
		cfg.JWT.RefreshDuration(),
	)

	return &WebApp{
		Config:         cfg,
		Version:        AppVersion,
		DB:             db,
		UserRepo:       userRepo,
		SessionRepo:    sessionRepo,
		FileRepo:       fileRepo,
		CredentialRepo: credentialRepo,
		AuthService:    authService,
	}, nil
}

// NewWebApp creates a WebApp with pre-built dependencies (useful for testing).
func NewWebApp(cfg *config.Config, db *gorm.DB,
	userRepo repository.UserRepository,
	sessionRepo repository.SessionRepository,
	fileRepo repository.FileRepository,
	credentialRepo repository.CredentialRepository,
	authService *service.AuthService,
) *WebApp {
	return &WebApp{
		Config:         cfg,
		Version:        AppVersion,
		DB:             db,
		UserRepo:       userRepo,
		SessionRepo:    sessionRepo,
		FileRepo:       fileRepo,
		CredentialRepo: credentialRepo,
		AuthService:    authService,
	}
}

// Close releases resources held by the application (e.g., database connections).
func (w *WebApp) Close() error {
	if w.DB == nil {
		return nil
	}
	sqlDB, err := w.DB.DB()
	if err != nil {
		return err
	}
	return sqlDB.Close()
}