package roomescape.auth.business

import io.github.oshai.kotlinlogging.KLogger
import io.github.oshai.kotlinlogging.KotlinLogging
import org.springframework.stereotype.Service
import org.springframework.transaction.annotation.Transactional
import roomescape.auth.exception.AuthErrorCode
import roomescape.auth.exception.AuthException
import roomescape.auth.infrastructure.jwt.JwtHandler
import roomescape.auth.web.LoginCheckResponse
import roomescape.auth.web.LoginRequest
import roomescape.auth.web.LoginResponse
import roomescape.member.implement.MemberFinder
import roomescape.member.infrastructure.persistence.MemberEntity

private val log: KLogger = KotlinLogging.logger {}

@Service
class AuthService(
    private val memberFinder: MemberFinder,
    private val jwtHandler: JwtHandler,
) {
    @Transactional(readOnly = true)
    fun login(request: LoginRequest): LoginResponse {
        val params = "email=${request.email}, password=${request.password}"
        log.debug { "[AuthService.login] 시작: $params" }

        val member: MemberEntity = fetchOrThrow(AuthErrorCode.LOGIN_FAILED) {
            memberFinder.findByEmailAndPassword(request.email, request.password)
        }
        val accessToken: String = jwtHandler.createToken(member.id!!)

        return LoginResponse(accessToken)
            .also { log.info { "[AuthService.login] 완료: email=${request.email}, memberId=${member.id}" } }
    }

    @Transactional(readOnly = true)
    fun checkLogin(memberId: Long): LoginCheckResponse {
        log.debug { "[AuthService.checkLogin] 시작: memberId=$memberId" }

        val member: MemberEntity = fetchOrThrow(AuthErrorCode.MEMBER_NOT_FOUND) { memberFinder.findById(memberId) }

        return LoginCheckResponse(member.name, member.role.name)
            .also { log.info { "[AuthService.checkLogin] 완료: memberId=$memberId, role=${it.role}" } }
    }

    private fun fetchOrThrow(errorCode: AuthErrorCode, block: () -> MemberEntity): MemberEntity {
        try {
            return block()
        } catch (e: Exception) {
            throw AuthException(errorCode, e.message ?: errorCode.message)
        }
    }

    fun logout(memberId: Long) {
        log.info { "[AuthService.logout] 로그아웃: memberId=$memberId" }
    }
}