package roomescape.schedule.business

import ScheduleException
import com.github.f4b6a3.tsid.TsidFactory
import io.github.oshai.kotlinlogging.KLogger
import io.github.oshai.kotlinlogging.KotlinLogging
import org.springframework.data.repository.findByIdOrNull
import org.springframework.stereotype.Service
import org.springframework.transaction.annotation.Transactional
import roomescape.common.config.next
import roomescape.member.business.MemberService
import roomescape.schedule.exception.ScheduleErrorCode
import roomescape.schedule.infrastructure.persistence.ScheduleEntity
import roomescape.schedule.infrastructure.persistence.ScheduleRepository
import roomescape.schedule.infrastructure.persistence.ScheduleStatus
import roomescape.schedule.web.*
import java.time.LocalDate

private val log: KLogger = KotlinLogging.logger {}

@Service
class ScheduleService(
    private val scheduleRepository: ScheduleRepository,
    private val scheduleValidator: ScheduleValidator,
    private val tsidFactory: TsidFactory,
    private val memberService: MemberService
) {

    @Transactional(readOnly = true)
    fun findThemesByDate(date: LocalDate): AvailableThemeIdListResponse {
        log.info { "[ScheduleService.findThemesByDate] 동일한 날짜의 모든 테마 조회: date=$date" }

        return scheduleRepository.findAllByDate(date)
            .toThemeIdListResponse()
            .also {
                log.info { "[ScheduleService.findThemesByDate] date=${date} 인 ${it.themeIds.size}개 테마 조회 완료" }
            }
    }

    @Transactional(readOnly = true)
    fun findSchedules(date: LocalDate, themeId: Long): ScheduleRetrieveListResponse {
        log.info { "[ScheduleService.findSchedules] 동일한 날짜와 테마인 모든 일정 조회: date=${date}, themeId=${themeId}" }

        return scheduleRepository.findAllByDateAndThemeId(date, themeId)
            .toRetrieveListResponse()
            .also {
                log.info { "[ScheduleService.findSchedules] date=${date}, themeId=${themeId} 인 ${it.schedules.size}개 일정 조회 완료" }
            }
    }

    @Transactional(readOnly = true)
    fun findDetail(id: Long): ScheduleDetailRetrieveResponse {
        log.info { "[ScheduleService.findDetail] 일정 상세 정보조회 시작: id=$id" }

        val schedule: ScheduleEntity = findOrThrow(id)

        val createdBy = memberService.findById(schedule.createdBy).name
        val updatedBy = memberService.findById(schedule.updatedBy).name

        return schedule.toDetailRetrieveResponse(createdBy, updatedBy)
            .also {
                log.info { "[ScheduleService.findDetail] 일정 상세 조회 완료: id=$id" }
            }
    }

    @Transactional
    fun createSchedule(request: ScheduleCreateRequest): ScheduleCreateResponse {
        log.info { "[ScheduleService.createSchedule] 일정 생성 시작: date=${request.date}, time=${request.time}, themeId=${request.themeId}" }

        scheduleValidator.validateCanCreate(request)

        val schedule = ScheduleEntity(
            id = tsidFactory.next(),
            date = request.date,
            time = request.time,
            themeId = request.themeId,
            status = ScheduleStatus.AVAILABLE
        )

        return ScheduleCreateResponse(scheduleRepository.save(schedule).id)
            .also {
                log.info { "[ScheduleService.createSchedule] 일정 생성 완료: id=${it.id}" }
            }
    }

    @Transactional
    fun updateSchedule(id: Long, request: ScheduleUpdateRequest) {
        log.info { "[ScheduleService.updateSchedule] 일정 수정 시작: id=$id, request=${request}" }

        if (request.isAllParamsNull()) {
            log.info { "[ScheduleService.updateSchedule] 일정 변경 사항 없음: id=$id" }
            return
        }

        val schedule: ScheduleEntity = findOrThrow(id)

        scheduleValidator.validateCanUpdate(schedule, request)

        schedule.modifyIfNotNull(
            request.time,
            request.status
        ).also {
            log.info { "[ScheduleService.updateSchedule] 일정 수정 완료: id=$id, request=${request}" }
        }
    }

    @Transactional
    fun deleteSchedule(id: Long) {
        log.info { "[ScheduleService.deleteSchedule] 일정 삭제 시작: id=$id" }

        val schedule: ScheduleEntity = findOrThrow(id)

        scheduleValidator.validateCanDelete(schedule)

        scheduleRepository.delete(schedule).also {
            log.info { "[ScheduleService.deleteSchedule] 일정 삭제 완료: id=$id" }
        }
    }

    private fun findOrThrow(id: Long): ScheduleEntity {
        log.info { "[ScheduleService.findOrThrow] 일정 조회 시작: id=$id" }

        return scheduleRepository.findByIdOrNull(id)
            ?.also { log.info { "[ScheduleService.findOrThrow] 일정 조회 완료: id=$id" } }
            ?: run {
                log.warn { "[ScheduleService.updateSchedule] 일정 조회 실패. id=$id" }
                throw ScheduleException(ScheduleErrorCode.SCHEDULE_NOT_FOUND)
            }
    }
}