package com.yunhai.svchall.job;

import com.yunhai.svchall.entity.ServiceApply;
import com.yunhai.svchall.enums.ApplyFlowStatusEnum;
import com.yunhai.svchall.repository.ServiceApplyRepository;
import com.yunhai.svchall.service.FlowClient;
import com.yunhai.svchall.service.SvcBizTypes;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;

import java.time.LocalDateTime;
import java.util.List;
import java.util.Map;

/**
 * 对账兜底 Job（降级为应急闸，V2.0 Part B.4#5 → 契约冻结 v1.4）：
 * 升级后 flow-center 回调为<b>持续重试</b>（1m→5m→30m→2h→6h→60m 封顶）+ retryCount=6 挂起并
 * UserMsg 告警恰一次 + 死信管理端手工处理——消费方免每日对账（本应用 5xx 语义已对齐），
 * 故本 Job 默认停用（svchall.flow.reconcile-enabled=false）；仅在大面积漂移事故应急时置 true
 * 手工开闸。开启时语义不变：拉在途办件（审批中）→ 按 biz 键查 flow-center 真实状态 →
 * 漂移以 flow-center 为准修正（对账直改状态，不写 service_flow_event 去重表与结果明细——
 * 与回调链路的差异，仅应急用不混淆镜像口径）。
 */
@Slf4j
@Component
public class FlowReconcileJob {

    private final ServiceApplyRepository applyRepository;
    private final FlowClient flowClient;
    private final boolean reconcileEnabled;

    public FlowReconcileJob(ServiceApplyRepository applyRepository, FlowClient flowClient,
                            @Value("${svchall.flow.reconcile-enabled:false}") boolean reconcileEnabled) {
        this.applyRepository = applyRepository;
        this.flowClient = flowClient;
        this.reconcileEnabled = reconcileEnabled;
    }

    @Scheduled(cron = "0 0 4 * * ?")
    public void reconcile() {
        if (!reconcileEnabled) {
            return; // 默认停用：免对账契约下推拉主链路由回调持续重试承担
        }
        if (!flowClient.enabled()) {
            return;
        }
        // 全租户口径：审批中的在途办件（分页上限 500，量级评估：全校审批 << 千/周）
        List<ServiceApply> pending = applyRepository.findByFlowStatus(ApplyFlowStatusEnum.APPROVING.getCode(),
                org.springframework.data.domain.PageRequest.of(0, 500));
        int fixed = 0;
        for (ServiceApply apply : pending) {
            if (apply.getFlowInstanceId() == null) {
                continue;
            }
            try {
                // 双值双查（P3.2 方案B）：先终值后存量，首个命中实例为准——命中判据用内容
                // （id/status 非空）而非"非 null"，对 miss 形态（运行时 data=null / 空载体）都稳
                Map<String, Object> remote = null;
                for (String bizType : SvcBizTypes.queryOrder()) {
                    Map<String, Object> candidate = flowClient.getInstanceByBiz(
                            apply.getSchId(), bizType, String.valueOf(apply.getId()));
                    if (candidate != null
                            && (candidate.get("id") != null || candidate.get("status") != null)) {
                        remote = candidate;
                        break;
                    }
                }
                if (remote == null) {
                    continue;
                }
                Integer remoteStatus = toInt(remote.get("status"));
                Integer remoteVersion = toInt(remote.get("version"));
                if (remoteStatus != null && !remoteStatus.equals(apply.getFlowStatus())
                        && (remoteVersion == null || remoteVersion > apply.getLastInstanceVersion())) {
                    apply.setFlowStatus(remoteStatus);
                    if (remoteVersion != null) {
                        apply.setLastInstanceVersion(remoteVersion);
                    }
                    if (remoteStatus.equals(ApplyFlowStatusEnum.COMPLETED.getCode())
                            || remoteStatus.equals(ApplyFlowStatusEnum.REJECTED.getCode())
                            || remoteStatus.equals(ApplyFlowStatusEnum.WITHDRAWN.getCode())) {
                        apply.setFinishTime(LocalDateTime.now());
                    }
                    applyRepository.save(apply);
                    fixed++;
                }
            } catch (Exception e) {
                log.warn("[svc-hall] 对账跳过 applyId={}：{}", apply.getId(), e.toString());
            }
        }
        if (fixed > 0 || !pending.isEmpty()) {
            log.info("[svc-hall] 对账完成（应急闸开启中）：在途 {} 条，修正 {} 条", pending.size(), fixed);
        }
    }

    private static Integer toInt(Object value) {
        if (value == null) {
            return null;
        }
        if (value instanceof Number) {
            return ((Number) value).intValue();
        }
        try {
            return Integer.parseInt(String.valueOf(value));
        } catch (NumberFormatException e) {
            return null;
        }
    }
}