package service

import (
	"context"

	"github.com/aykhans/oh-my-chat/internal/core/domain"
	"github.com/aykhans/oh-my-chat/internal/core/port"
	"github.com/aykhans/oh-my-chat/internal/core/utils"
)

type UserService struct {
	repo port.UserRepository
}

func NewUserService(repo port.UserRepository) *UserService {
	return &UserService{repo: repo}
}

func (userService *UserService) Register(
	ctx context.Context,
	user *domain.User,
) (*domain.User, error) {
	if exists, err := userService.repo.IsUsernameExists(ctx, user.Username); err != nil {
		return nil, domain.ErrInternal
	} else if exists {
		return nil, domain.ErrUsernameExists
	}
	if exists, err := userService.repo.IsEmailExists(ctx, user.Email); err != nil {
		return nil, domain.ErrInternal
	} else if exists {
		return nil, domain.ErrEmailExists
	}

	hashedPassword, err := utils.HashPassword(user.Password)
	if err != nil {
		return nil, domain.ErrInternal
	}
	user.Password = hashedPassword

	user, err = userService.repo.CreateUser(ctx, user)
	if err != nil {
		if err == domain.ErrConflictingData {
			return nil, err
		}
		return nil, domain.ErrInternal
	}

	return user, nil
}