package roomescape.payment.business

import io.github.oshai.kotlinlogging.KotlinLogging
import org.springframework.stereotype.Service
import org.springframework.transaction.annotation.Transactional
import roomescape.payment.exception.PaymentErrorCode
import roomescape.payment.exception.PaymentException
import roomescape.payment.infrastructure.client.PaymentApproveResponse
import roomescape.payment.infrastructure.persistence.CanceledPaymentEntity
import roomescape.payment.infrastructure.persistence.CanceledPaymentRepository
import roomescape.payment.infrastructure.persistence.PaymentEntity
import roomescape.payment.infrastructure.persistence.PaymentRepository
import roomescape.payment.web.PaymentCancelRequest
import roomescape.payment.web.PaymentCancelResponse
import roomescape.payment.web.PaymentCreateResponse
import roomescape.payment.web.toCreateResponse
import roomescape.reservation.infrastructure.persistence.ReservationEntity
import java.time.OffsetDateTime

private val log = KotlinLogging.logger {}

@Service
class PaymentService(
    private val paymentRepository: PaymentRepository,
    private val canceledPaymentRepository: CanceledPaymentRepository,
) {
    @Transactional
    fun createPayment(
        approveResponse: PaymentApproveResponse,
        reservation: ReservationEntity,
    ): PaymentCreateResponse {
        log.debug { "[PaymentService.createPayment] 결제 정보 저장 시작: request=$approveResponse, reservationId=${reservation.id}" }
        val payment = PaymentEntity(
            orderId = approveResponse.orderId,
            paymentKey = approveResponse.paymentKey,
            totalAmount = approveResponse.totalAmount,
            reservation = reservation,
            approvedAt = approveResponse.approvedAt
        )

        return paymentRepository.save(payment)
            .toCreateResponse()
            .also { log.info { "[PaymentService.createPayment] 결제 정보 저장 완료: paymentId=${it.id}, reservationId=${reservation.id}" } }
    }

    @Transactional(readOnly = true)
    fun isReservationPaid(reservationId: Long): Boolean {
        log.debug { "[PaymentService.isReservationPaid] 예약 결제 여부 확인 시작: reservationId=$reservationId" }

        return paymentRepository.existsByReservationId(reservationId)
            .also { log.info { "[PaymentService.isReservationPaid] 예약 결제 여부 확인 완료: reservationId=$reservationId, isPaid=$it" } }
    }

    @Transactional
    fun createCanceledPayment(
        cancelInfo: PaymentCancelResponse,
        approvedAt: OffsetDateTime,
        paymentKey: String,
    ): CanceledPaymentEntity {
        log.debug {
            "[PaymentService.createCanceledPayment] 결제 취소 정보 저장 시작: paymentKey=$paymentKey" +
                    ", cancelInfo=$cancelInfo"
        }
        val canceledPayment = CanceledPaymentEntity(
            paymentKey = paymentKey,
            cancelReason = cancelInfo.cancelReason,
            cancelAmount = cancelInfo.cancelAmount,
            approvedAt = approvedAt,
            canceledAt = cancelInfo.canceledAt
        )

        return canceledPaymentRepository.save(canceledPayment)
            .also {
                log.info {
                    "[PaymentService.createCanceledPayment] 결제 취소 정보 생성 완료: canceledPaymentId=${it.id}" +
                            ", paymentKey=${paymentKey}, amount=${cancelInfo.cancelAmount}, canceledAt=${it.canceledAt}"
                }
            }
    }

    @Transactional
    fun createCanceledPaymentByReservationId(reservationId: Long): PaymentCancelRequest {
        log.debug { "[PaymentService.createCanceledPaymentByReservationId] 예약 삭제 & 결제 취소 정보 저장 시작: reservationId=$reservationId" }
        val paymentKey: String = paymentRepository.findPaymentKeyByReservationId(reservationId)
            ?: run {
                log.warn { "[PaymentService.createCanceledPaymentByReservationId] 예약 조회 실패: reservationId=$reservationId" }
                throw PaymentException(PaymentErrorCode.PAYMENT_NOT_FOUND)
            }

        val canceled: CanceledPaymentEntity = cancelPayment(paymentKey)

        return PaymentCancelRequest(paymentKey, canceled.cancelAmount, canceled.cancelReason)
            .also { log.info { "[PaymentService.createCanceledPaymentByReservationId] 예약 ID로 결제 취소 완료: reservationId=$reservationId" } }
    }

    private fun cancelPayment(
        paymentKey: String,
        cancelReason: String = "고객 요청",
        canceledAt: OffsetDateTime = OffsetDateTime.now(),
    ): CanceledPaymentEntity {
        log.debug { "[PaymentService.cancelPayment] 결제 취소 정보 저장 시작: paymentKey=$paymentKey" }
        val payment: PaymentEntity = paymentRepository.findByPaymentKey(paymentKey)
            ?.also {
                paymentRepository.delete(it)
                log.info { "[PaymentService.cancelPayment] 결제 정보 삭제 완료: paymentId=${it.id}, paymentKey=$paymentKey" }
            }
            ?: run {
                log.warn { "[PaymentService.cancelPayment] 결제 정보 조회 실패: paymentKey=$paymentKey" }
                throw PaymentException(PaymentErrorCode.PAYMENT_NOT_FOUND)
            }

        val canceledPayment = CanceledPaymentEntity(
            paymentKey = paymentKey,
            cancelReason = cancelReason,
            cancelAmount = payment.totalAmount,
            approvedAt = payment.approvedAt,
            canceledAt = canceledAt
        )

        return canceledPaymentRepository.save(canceledPayment)
            .also { log.info { "[PaymentService.cancelPayment] 결제 취소 정보 저장 완료: canceledPaymentId=${it.id}" } }
    }

    @Transactional
    fun updateCanceledTime(
        paymentKey: String,
        canceledAt: OffsetDateTime,
    ) {
        log.debug { "[PaymentService.updateCanceledTime] 취소 시간 업데이트 시작: paymentKey=$paymentKey, canceledAt=$canceledAt" }
        canceledPaymentRepository.findByPaymentKey(paymentKey)
            ?.apply { this.canceledAt = canceledAt }
            ?.also {
                log.info {
                    "[PaymentService.updateCanceledTime] 취소 시간 업데이트 완료: paymentKey=$paymentKey" +
                            ", canceledAt=$canceledAt"
                }
            }
            ?: run {
                log.warn { "[PaymentService.updateCanceledTime] 결제 정보 조회 실패: paymentKey=$paymentKey" }
                throw PaymentException(PaymentErrorCode.PAYMENT_NOT_FOUND)
            }
    }
}