package be.simplenotes.domain.usecases.users.register

import arrow.core.Either
import arrow.core.filterOrElse
import arrow.core.leftIfNull
import be.simplenotes.types.PersistedUser
import be.simplenotes.domain.security.PasswordHash
import be.simplenotes.domain.usecases.repositories.UserRepository
import be.simplenotes.domain.validation.UserValidations

internal class RegisterUseCaseImpl(
    private val userRepository: UserRepository,
    private val passwordHash: PasswordHash
) : RegisterUseCase {
    override fun register(form: RegisterForm): Either<RegisterError, PersistedUser> {
        return UserValidations.validateRegister(form)
            .filterOrElse({ !userRepository.exists(it.username) }, { UserExists })
            .map { it.copy(password = passwordHash.crypt(it.password)) }
            .map { userRepository.create(it) }
            .leftIfNull { UserExists }
    }
}