package users

import (
	"context"
	"fmt"
	"github.com/eko/gocache/cache"
	"go.uber.org/zap"
)

type Service struct {
	logger         *zap.Logger
	cache          *cache.Cache
	repository     Repository
	passwordHasher PasswordHasher
}

func NewService(l *zap.Logger, ur Repository, c *cache.Cache) *Service {
	return &Service{
		logger:         l,
		repository:     ur,
		cache:          c,
		passwordHasher: NewPlainTextPasswordHasher(),
	}
}

func (s *Service) Create(email string, password string) (int, error) {
	createUser, err := NewCreateUser(email, password, s.passwordHasher)
	if err != nil {
		return -1, err
	}

	var userId int
	userId, err = s.repository.Create(context.Background(), createUser)
	if err != nil {
		s.logger.Warn("Could not create user in service")
		return 0, err
	}

	return userId, nil
}

func (s *Service) Authenticate(ctx context.Context, email string, password string) (*User, error) {
	loadFunc := func(key interface{}) (interface{}, error) {
		s.logger.Debug("getting user from cache", zap.String("email", email))
		return s.repository.GetByEmail(ctx, email, s.passwordHasher.HashPassword(password))
	}

	get, err := cache.NewLoadable(loadFunc, s.cache).Get(fmt.Sprintf("user_email_%s", email))
	if err != nil {
		return nil, err
	}

	return get.(*User), nil
}