package com.gzzn.omms.msgexchange.processing

import com.gzzn.omms.msgexchange.codec.XmlCodec
import com.gzzn.omms.msgexchange.config.OperationDayProps
import com.gzzn.omms.msgexchange.config.PipelineProps
import com.gzzn.omms.msgexchange.domain.OutboundRequestKeys
import com.gzzn.omms.msgexchange.infra.persistence.CoutmsgOutboxRepository
import com.gzzn.omms.msgexchange.infra.persistence.ReqTrackRepository
import jakarta.inject.Singleton
import org.slf4j.LoggerFactory
import java.time.Clock
import java.time.LocalDate
import java.time.ZoneId
import java.time.format.DateTimeFormatter

/**
 * 出站 REQ_TRACK 协调：登记、COUTMSGS 落信、超时与 EROR 失败（`C-4`）。
 */
@Singleton
class OutboundRequestService(
    private val reqTrack: ReqTrackRepository,
    private val outbox: CoutmsgOutboxRepository,
    private val codec: XmlCodec,
    private val props: PipelineProps,
    operationDayProps: OperationDayProps,
    private val clock: Clock,
) {
    private val log = LoggerFactory.getLogger(OutboundRequestService::class.java)
    private val zone: ZoneId = operationDayProps.zoneId()
    private val cutoffHour = operationDayProps.cutoffHour.coerceIn(0, 23)
    private val dttmFmt = DateTimeFormatter.ofPattern("yyyyMMddHHmmss")

    sealed interface RegisterOutcome {
        data class Registered(val reqId: Long) : RegisterOutcome
        data object OpenExists : RegisterOutcome
    }

    fun currentOperationDay(): LocalDate {
        val airport = clock.withZone(zone)
        val now = java.time.LocalDateTime.now(airport)
        val day = now.toLocalDate()
        return if (now.hour < cutoffHour) day.minusDays(1) else day
    }

    fun hasOpenRequest(reqType: String, operationDay: LocalDate = currentOperationDay()): Boolean =
        reqTrack.findLatest(
            reqType,
            operationDay,
            OutboundRequestKeys.SENDER,
            listOf(ReqTrackRepository.ReqState.PENDING, ReqTrackRepository.ReqState.SENT),
        ) != null

    fun registerRqfdSync(): RegisterOutcome {
        val day = currentOperationDay()
        if (hasOpenRequest(OutboundRequestKeys.RQFD_REQ_TYPE, day)) return RegisterOutcome.OpenExists
        val reqId = reqTrack.insert(OutboundRequestKeys.RQFD_REQ_TYPE, day, OutboundRequestKeys.SENDER)
        dispatchPending(limit = 1)
        return RegisterOutcome.Registered(reqId)
    }

    fun hasOpenSentRqfd(operationDay: LocalDate = currentOperationDay()): Boolean =
        reqTrack.findLatest(
            OutboundRequestKeys.RQFD_REQ_TYPE,
            operationDay,
            OutboundRequestKeys.SENDER,
            listOf(ReqTrackRepository.ReqState.SENT),
        ) != null

    fun completeRqfdResponse(operationDay: LocalDate = currentOperationDay()): Boolean =
        reqTrack.completeLatest(OutboundRequestKeys.RQFD_REQ_TYPE, operationDay, OutboundRequestKeys.SENDER)

    fun completeRqrdResponse(operationDay: LocalDate = currentOperationDay()): Boolean =
        reqTrack.completeLatest(OutboundRequestKeys.RQRD_REQ_TYPE, operationDay, OutboundRequestKeys.SENDER)

    fun dispatchPending(limit: Int = 10): Int {
        var sent = 0
        reqTrack.listPendingDispatch(limit).forEach { req ->
            if (dispatchOne(req)) sent++
        }
        return sent
    }

    fun expireTimedOut(): Int {
        val cutoff = clock.instant().minus(props.outbound.responseTimeout)
        return reqTrack.expireSentOlderThan(cutoff)
    }

    fun failFromEror(seqs: Long, typs: String, stys: String): Boolean {
        val reqType = OutboundRequestKeys.reqTypeFromEror(typs, stys) ?: return false
        val day = currentOperationDay()
        val open = reqTrack.findOpenSentBySeqn(reqType, day, OutboundRequestKeys.SENDER, seqs) ?: return false
        reqTrack.markFailed(open.reqId)
        log.warn(
            "outbound request FAILED from EROR reqId={} type={} seqn={} typs={} stys={}",
            open.reqId, reqType, seqs, typs, stys,
        )
        return true
    }

    private fun dispatchOne(req: ReqTrackRepository.Req): Boolean {
        if (req.state != ReqTrackRepository.ReqState.PENDING || req.writeUncertain) return false
        val seqn = outbox.nextOutboundSeqn()
        val dttm = beijingMetaDttm()
        val xml = when (req.reqType) {
            OutboundRequestKeys.RQFD_REQ_TYPE -> codec.encodeOutboundRqfd(seqn, dttm)
            OutboundRequestKeys.RQRD_REQ_TYPE -> codec.encodeOutboundRqrd("AIRL", seqn, dttm)
            else -> {
                log.warn("unknown req_type for dispatch reqId={} type={}", req.reqId, req.reqType)
                return false
            }
        }
        val routing = when (req.reqType) {
            OutboundRequestKeys.RQFD_REQ_TYPE -> props.outbound.routingRqfd
            else -> props.outbound.routingRqrd
        }
        val inserted = outbox.insertMessage(xml, routing)
        return when (inserted.outcome) {
            CoutmsgOutboxRepository.InsertOutcome.CONFIRMED -> {
                val id = inserted.coutmsgsId ?: return false
                reqTrack.linkCoutmsgs(req.reqId, id, seqn)
                reqTrack.markSent(req.reqId, clock.instant())
                log.info("outbound COUTMSGS SENT reqId={} coutmsgsId={} seqn={}", req.reqId, id, seqn)
                true
            }
            CoutmsgOutboxRepository.InsertOutcome.AMBIGUOUS -> {
                reqTrack.markWriteUncertain(req.reqId)
                log.error(
                    "outbound COUTMSGS write AMBIGUOUS reqId={} seqn={} — recorded, no blind resend",
                    req.reqId, seqn,
                )
                false
            }
        }
    }

    private fun beijingMetaDttm(): Long {
        val ldt = java.time.LocalDateTime.ofInstant(clock.instant(), zone)
        return dttmFmt.format(ldt).toLong()
    }
}