package be.simplenotes.domain.usecases.users.login

import arrow.core.computations.either
import arrow.core.filterOrElse
import arrow.core.rightIfNotNull
import be.simplenotes.domain.security.PasswordHash
import be.simplenotes.domain.security.SimpleJwt
import be.simplenotes.domain.validation.UserValidations
import be.simplenotes.persistance.repositories.UserRepository
import be.simplenotes.types.LoggedInUser
import io.micronaut.context.annotation.Primary
import javax.inject.Singleton

@Singleton
@Primary
internal class LoginUseCaseImpl(
    private val userRepository: UserRepository,
    private val passwordHash: PasswordHash,
    private val jwt: SimpleJwt<LoggedInUser>
) : LoginUseCase {
    override fun login(form: LoginForm) = either.eager<LoginError, Token> {
        val user = !UserValidations.validateLogin(form)
        !userRepository.find(user.username)
            .rightIfNotNull { Unregistered }
            .filterOrElse({ passwordHash.verify(form.password!!, it.password) }, { WrongPassword })
            .map { jwt.sign(LoggedInUser(it)) }
    }
}