package roomescape.reservation.implement

import io.github.oshai.kotlinlogging.KLogger
import io.github.oshai.kotlinlogging.KotlinLogging
import org.springframework.data.jpa.domain.Specification
import org.springframework.data.repository.findByIdOrNull
import org.springframework.stereotype.Component
import roomescape.reservation.exception.ReservationErrorCode
import roomescape.reservation.exception.ReservationException
import roomescape.reservation.infrastructure.persistence.ReservationEntity
import roomescape.reservation.infrastructure.persistence.ReservationRepository
import roomescape.reservation.infrastructure.persistence.ReservationSearchSpecification
import roomescape.reservation.infrastructure.persistence.ReservationStatus
import roomescape.reservation.web.MyReservationRetrieveResponse
import roomescape.theme.infrastructure.persistence.ThemeEntity
import roomescape.time.infrastructure.persistence.TimeEntity
import java.time.LocalDate

private val log: KLogger = KotlinLogging.logger {}

@Component
class ReservationFinder(
    private val reservationRepository: ReservationRepository,
    private val reservationValidator: ReservationValidator,
) {
    fun findById(id: Long): ReservationEntity {
        log.debug { "[ReservationFinder.findById] 시작: id=$id" }

        return reservationRepository.findByIdOrNull(id)
            ?.also { log.debug { "[ReservationFinder.findById] 완료: reservationId=$id, date:${it.date}, timeId:${it.time.id}, themeId:${it.theme.id}" } }
            ?: run {
                log.warn { "[ReservationFinder.findById] 조회 실패: reservationId=$id" }
                throw ReservationException(ReservationErrorCode.RESERVATION_NOT_FOUND)
            }
    }

    fun findAllByStatuses(vararg statuses: ReservationStatus): List<ReservationEntity> {
        log.debug { "[ReservationFinder.findAll] 시작: status=${statuses}" }

        val spec = ReservationSearchSpecification()
            .status(*statuses)
            .build()

        return reservationRepository.findAll(spec)
            .also { log.debug { "[ReservationFinder.findAll] ${it.size}개 예약 조회 완료: status=${statuses}" } }
    }

    fun findAllByDateAndTheme(
        date: LocalDate, theme: ThemeEntity
    ): List<ReservationEntity> {
        log.debug { "[ReservationFinder.findAllByDateAndTheme] 시작: date=$date, themeId=${theme.id}" }

        return reservationRepository.findAllByDateAndTheme(date, theme)
            .also { log.debug { "[ReservationFinder.findAllByDateAndTheme] ${it.size}개 조회 완료: date=$date, themeId=${theme.id}" } }
    }

    fun findAllByMemberId(memberId: Long): List<MyReservationRetrieveResponse> {
        log.debug { "[ReservationFinder.findAllByMemberId] 시작: memberId=${memberId}" }

        return reservationRepository.findAllByMemberId(memberId)
            .also { log.debug { "[ReservationFinder.findAllByMemberId] ${it.size}개 예약(대기) 조회 완료: memberId=${memberId}" } }
    }

    fun searchReservations(
        themeId: Long?,
        memberId: Long?,
        startFrom: LocalDate?,
        endAt: LocalDate?,
    ): List<ReservationEntity> {
        reservationValidator.validateSearchDateRange(startFrom, endAt)

        val spec: Specification<ReservationEntity> = ReservationSearchSpecification()
            .sameThemeId(themeId)
            .sameMemberId(memberId)
            .dateStartFrom(startFrom)
            .dateEndAt(endAt)
            .status(ReservationStatus.CONFIRMED, ReservationStatus.CONFIRMED_PAYMENT_REQUIRED)
            .build()

        return reservationRepository.findAll(spec)
            .also {
                log.debug { "[ReservationFinder.searchReservations] ${it.size}개 예약 조회 완료. " +
                    "themeId=${themeId}, memberId=${memberId}, startFrom=${startFrom}, endAt=${endAt}" }
            }

    }

    fun isTimeReserved(time: TimeEntity): Boolean {
        log.debug { "[ReservationFinder.isTimeReserved] 시작: timeId=${time.id}, startAt=${time.startAt}" }

        return reservationRepository.existsByTime(time)
            .also { log.debug { "[ReservationFinder.isTimeReserved] 완료: isExist=$it, timeId=${time.id}, startAt=${time.startAt}" } }
    }
}