msgexchange-v2/src/main/kotlin/com/gzzn/omms/msgexchange/ingress/InboxPoller.kt

package com.gzzn.omms.msgexchange.ingress

import com.gzzn.omms.msgexchange.config.PipelineProps
import com.gzzn.omms.msgexchange.infra.persistence.CminmsgInboxRepository
import com.gzzn.omms.msgexchange.jobs.BackfillSweepJob
import jakarta.inject.Singleton

/**
 * ACMA-8 流程 1 · 主路径：JDBC 轮询共享 MySQL CMINMSGS（`DATE_PROCESSED IS NULL`），
 * 发现新信后入队自有 PG。与 legacy `MsgExchangeRunner.getNewMsgsAfterId(0L)` 同语义。
 */
@Singleton
class InboxPoller(
    private val inbox: CminmsgInboxRepository,
    private val enqueue: InboxEnqueue,
    private val backfillSweep: BackfillSweepJob,
    private val props: PipelineProps,
) {
    private val log = org.slf4j.LoggerFactory.getLogger(InboxPoller::class.java)

    @Volatile
    private var running = false

    /** legacy 现役：afterId=0，每轮扫全部未处理行；PROC_STATE 判重防重复入队。 */
    fun pollOnce(): Int {
        val batch = props.pipeline.claimBatch.coerceAtLeast(1)
        val ids = inbox.pollUnprocessed(afterId = 0L, limit = batch)
        var enqueued = 0
        for (id in ids) {
            if (enqueue.enqueue(id)) {
                enqueued++
                log.info("polled msgId={}", id)
            }
        }
        sweepBackfillTodos()
        return enqueued
    }

    /** v2 §5：每轮心跳顺带对账回填补偿待办（重启即恢复；空表只花一次索引 SELECT）。 */
    private fun sweepBackfillTodos() {
        try {
            val outcome = backfillSweep.sweep()
            if (outcome.inspected > 0) {
                log.info("backfill sweep inspected={} succeeded={} failed={}", outcome.inspected, outcome.succeeded, outcome.failed)
            }
        } catch (e: Exception) {
            log.error("backfill sweep tick failed", e)
        }
    }

    fun loop() {
        running = true
        log.info("inbox poller loop started")
        while (running) {
            try {
                pollOnce()
                sleepQuietly(props.pipeline.pollInterval)
            } catch (_: InterruptedException) {
                Thread.currentThread().interrupt()
                break
            } catch (e: Exception) {
                log.error("inbox poller tick failed", e)
                sleepQuietly(props.pipeline.pollInterval)
            }
        }
        log.info("inbox poller loop stopped")
    }

    fun stop() {
        running = false
    }

    private fun sleepQuietly(d: java.time.Duration) {
        try {
            Thread.sleep(d.toMillis().coerceAtLeast(1))
        } catch (_: InterruptedException) {
            Thread.currentThread().interrupt()
        }
    }
}