package com.yunhai.flowcenter.service;

import com.yunhai.flowcenter.engine.BranchScope;
import com.yunhai.flowcenter.engine.FlowDefModel;
import com.yunhai.flowcenter.engine.FlowEngine;
import com.yunhai.flowcenter.entity.FlwBranch;
import com.yunhai.flowcenter.entity.FlwCc;
import com.yunhai.flowcenter.entity.FlwDef;
import com.yunhai.flowcenter.entity.FlwInstance;
import com.yunhai.flowcenter.entity.FlwRouteLog;
import com.yunhai.flowcenter.entity.FlwTask;
import com.yunhai.flowcenter.enums.FlwEnums;
import com.yunhai.flowcenter.model.FlowModels;
import com.yunhai.flowcenter.repository.FlwBranchRepository;
import com.yunhai.flowcenter.repository.FlwCcRepository;
import com.yunhai.flowcenter.repository.FlwDefRepository;
import com.yunhai.flowcenter.repository.FlwInstanceRepository;
import com.yunhai.flowcenter.repository.FlwRouteLogRepository;
import com.yunhai.flowcenter.repository.FlwTaskRepository;
import com.yunhai.platform.apistd.BizException;
import com.yunhai.platform.utils.exception.ErrorCode;
import com.yunhai.platform.utils.model.BasePageResult;
import lombok.RequiredArgsConstructor;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.Comparator;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

/**
 * 用户面查询（我的办件/待办/已办/办件详情）。
 */
@Service
@RequiredArgsConstructor
public class FlowQueryService {

    private final FlwInstanceRepository instanceRepository;
    private final FlwTaskRepository taskRepository;
    private final FlwBranchRepository branchRepository;
    private final FlwCcRepository ccRepository;
    private final FlwRouteLogRepository routeLogRepository;
    private final FlwDefRepository defRepository;
    private final FlowDeptAdminService deptAdminService;
    private final FlowEngine flowEngine;
    private final BizUrlResolver bizUrlResolver;

    public BasePageResult<FlowModels.InstanceItem> pageMy(Long schId, Integer submitterId,
                                                          Integer status, String appKey, Integer page, Integer size) {
        Page<FlwInstance> p = instanceRepository.pageMy(schId, submitterId, status, emptyToNull(appKey),
                PageRequest.of(normPage(page), normSize(size)));
        return toResult(p.getTotalElements(), p.getContent().stream().map(this::toInstanceItem)
                .collect(Collectors.toList()), page, size);
    }

    /** 抄送我的（NOTIFY 落库行，sent_time 倒序；知会不占待办，独立于 todo/done 口径） */
    public BasePageResult<FlowModels.CcItem> pageCc(Long schId, Integer userId,
                                                    String appKey, Integer page, Integer size) {
        Page<FlwCc> p = ccRepository.pageCc(schId, userId, emptyToNull(appKey),
                PageRequest.of(normPage(page), normSize(size)));
        List<FlowModels.CcItem> items = p.getContent().stream()
                .map(this::toCcItem).collect(Collectors.toList());
        fillCcInstanceInfo(items);
        return toResult(p.getTotalElements(), items, page, size);
    }

    private FlowModels.CcItem toCcItem(FlwCc cc) {
        FlowModels.CcItem item = new FlowModels.CcItem();
        item.setCcId(cc.getId());
        item.setInstanceId(cc.getInstanceId());
        item.setNodeId(cc.getNodeId());
        item.setNodeName(cc.getNodeName());
        item.setUserId(cc.getUserId());
        item.setUserName(cc.getUserName());
        item.setSentTime(str(cc.getSentTime()));
        return item;
    }

    private void fillCcInstanceInfo(List<FlowModels.CcItem> items) {
        for (FlowModels.CcItem item : items) {
            FlwInstance instance = instanceRepository.findById(item.getInstanceId()).orElse(null);
            if (instance != null) {
                item.setBizTitle(instance.getBizTitle());
                item.setBizType(instance.getBizType());
                item.setBizId(instance.getBizId());
                item.setInstanceStatus(instance.getStatus());
            }
        }
    }

    public BasePageResult<FlowModels.TaskItem> pageTodo(Long schId, Integer assigneeId, String appKey,
                                                        Integer page, Integer size) {
        Page<FlwTask> p = taskRepository.pageTodo(schId, assigneeId, emptyToNull(appKey),
                PageRequest.of(normPage(page), normSize(size)));
        List<FlowModels.TaskItem> items = p.getContent().stream()
                .map(this::toTaskItem).collect(Collectors.toList());
        fillInstanceInfo(items);
        return toResult(p.getTotalElements(), items, page, size);
    }

    /** 已办：一个办件一行（保留本人最后办理的那条），并回填累计办理次数 */
    public BasePageResult<FlowModels.TaskItem> pageDone(Long schId, Integer assigneeId, String appKey,
                                                        Integer page, Integer size) {
        List<Integer> handled = FlwEnums.TaskStatus.handledCodes();
        Page<FlwTask> p = taskRepository.pageDone(schId, assigneeId, handled, emptyToNull(appKey),
                PageRequest.of(normPage(page), normSize(size)));
        List<FlowModels.TaskItem> items = p.getContent().stream()
                .map(this::toTaskItem).collect(Collectors.toList());
        fillInstanceInfo(items);
        fillDoneCount(items, assigneeId, handled);
        return toResult(p.getTotalElements(), items, page, size);
    }

    /** 已办行的累计办理次数（同一办件多节点办理/退回重办时的"共办理 N 次"） */
    private void fillDoneCount(List<FlowModels.TaskItem> items, Integer assigneeId,
                               List<Integer> handled) {
        if (items.isEmpty()) {
            return;
        }
        List<Long> ids = items.stream().map(FlowModels.TaskItem::getInstanceId)
                .distinct().collect(Collectors.toList());
        Map<Long, Integer> counts = new HashMap<>();
        for (Object[] row : taskRepository.countDoneByInstance(ids, assigneeId, handled)) {
            counts.put((Long) row[0], ((Number) row[1]).intValue());
        }
        for (FlowModels.TaskItem item : items) {
            item.setDoneCount(counts.getOrDefault(item.getInstanceId(), 1));
        }
    }

    /**
     * 办件详情：快照 + 任务轨迹 + 分支进度 + 本人待办标记（办理页/详情页共用数据源）。
     * viewerId 必须由控制器从 BoaUser.getId() 传入（CAS 会话 LoginUser.userId 是登录名字符串，
     * 不是数字主键，不能直接转 Integer——2026-09-12 全链测试修复）。
     */
    public FlowModels.InstanceDetail detail(Long schId, Long instanceId, Integer viewerId) {
        FlwInstance instance = instanceRepository.findById(instanceId)
                .orElseThrow(() -> new BizException(ErrorCode.PARAM_ERROR, "办件不存在"));
        if (!instance.getSchId().equals(schId)) {
            throw new BizException(ErrorCode.FORBIDDEN, "办件不属于该学校");
        }
        FlowModels.InstanceDetail detail = new FlowModels.InstanceDetail();
        detail.setInstanceId(instance.getId());
        detail.setSchId(instance.getSchId());
        detail.setDefCode(instance.getDefCode());
        detail.setDefVersion(instance.getDefVersion());
        detail.setBizType(instance.getBizType());
        detail.setBizId(instance.getBizId());
        detail.setBizTitle(instance.getBizTitle());
        detail.setBizUrl(instance.getBizUrl());
        detail.setBizUrlAbs(bizUrlResolver.resolve(
                instance.getApplyAppCode(), instance.getApplyAppKey(), instance.getBizUrl()));
        detail.setBizSnapshot(instance.getBizSnapshot());
        detail.setFormDataJson(instance.getFormDataJson());
        detail.setStatus(instance.getStatus());
        detail.setCurrentNodes(instance.getCurrentNodes());
        detail.setSubmitterId(instance.getSubmitterId());
        detail.setSubmitterName(instance.getSubmitterName());
        detail.setSubmitTime(str(instance.getSubmitTime()));
        detail.setFinishTime(str(instance.getFinishTime()));
        detail.setVersion(instance.getVersion());
        List<FlwTask> tasks = taskRepository.findByInstanceIdOrderByIdAsc(instanceId);
        List<FlwCc> ccs = ccRepository.findByInstanceIdOrderByIdAsc(instanceId);
        List<FlwRouteLog> routeLogs = routeLogRepository.findByInstanceIdOrderByIdAsc(instanceId);
        FlwDef def = defRepository.findById(instance.getDefId()).orElse(null);
        FlowDefModel model = def == null ? null : flowEngine.parseModel(def);
        detail.setTrace(buildTrace(instance, tasks, ccs, routeLogs, model));
        List<Map<String, Object>> branches = new ArrayList<>();
        for (FlwBranch b : branchRepository.findByInstanceId(instanceId)) {
            Map<String, Object> row = new HashMap<>();
            row.put("branchKey", b.getBranchKey());
            row.put("status", b.getStatus());
            branches.add(row);
        }
        detail.setBranches(branches);
        List<Long> myPending = new ArrayList<>();
        if (viewerId != null) {
            for (FlwTask t : tasks) {
                if (viewerId.equals(t.getAssigneeId())
                        && t.getStatus() == FlwEnums.TaskStatus.PENDING.getCode()) {
                    myPending.add(t.getId());
                }
            }
            detail.setMyPendingTask(!myPending.isEmpty());
            detail.setMyPendingTaskIds(myPending);
        }
        detail.setNodeSummary(def == null ? "" : FlowEngine.nodeSummary(model));
        // 办理面板数据（出口/退回目标/移交标记）：仅对持本人待办的查看者填充
        FlwTask myPend = viewerId == null ? null : tasks.stream()
                .filter(t -> viewerId.equals(t.getAssigneeId())
                        && t.getStatus() == FlwEnums.TaskStatus.PENDING.getCode())
                .findFirst().orElse(null);
        if (myPend != null && def != null) {
            String curNodeId = myPend.getNodeId();
            List<FlowDefModel.Edge> outs = model.outEdges(curNodeId);
            if (outs.size() > 1) {
                List<Map<String, Object>> outlets = new ArrayList<>();
                for (FlowDefModel.Edge e : outs) {
                    Map<String, Object> o = new HashMap<>();
                    o.put("name", e.name);
                    o.put("toNodeId", e.to);
                    FlowDefModel.Node to = model.node(e.to);
                    o.put("toNodeName", to == null ? e.to
                            : (to.name == null || to.name.isEmpty() ? e.to : to.name));
                    outlets.add(o);
                }
                detail.setOutlets(outlets);
            } else {
                detail.setOutlets(new ArrayList<>());
            }
            // 可退回目标：办件已办过的主线审批节点（去重，排除当前节点）
            Map<String, Map<String, Object>> targets = new java.util.LinkedHashMap<>();
            for (FlwTask t : tasks) {
                if (t.getStatus() != FlwEnums.TaskStatus.APPROVED.getCode()
                        || t.getNodeId().equals(myPend.getNodeId())
                        || BranchScope.keyOf(model, t.getNodeId()) != null) {
                    continue;
                }
                FlowDefModel.Node node = model.node(t.getNodeId());
                if (node != null && FlowDefModel.TYPE_APPROVAL.equals(node.type)
                        && !targets.containsKey(t.getNodeId())) {
                    Map<String, Object> r = new HashMap<>();
                    r.put("nodeId", node.id);
                    r.put("nodeName", node.name == null || node.name.isEmpty() ? node.id : node.name);
                    targets.put(node.id, r);
                }
            }
            detail.setReturnTargets(new ArrayList<>(targets.values()));
            detail.setCanTransfer(true);
        } else {
            detail.setOutlets(new ArrayList<>());
            detail.setReturnTargets(new ArrayList<>());
        }
        return detail;
    }

    /** 任务定位办件详情（办理页 /task/{taskId} 数据源：UserMsg jumpPath 只带 taskId） */
    public FlowModels.InstanceDetail taskDetail(Long schId, Long taskId, Integer viewerId) {
        FlwTask task = taskRepository.findById(taskId)
                .orElseThrow(() -> new BizException(ErrorCode.PARAM_ERROR, "任务不存在：" + taskId));
        if (!task.getSchId().equals(schId)) {
            throw new BizException(ErrorCode.FORBIDDEN, "任务不属于该学校");
        }
        return detail(schId, task.getInstanceId(), viewerId);
    }

    private FlowModels.InstanceItem toInstanceItem(FlwInstance instance) {
        FlowModels.InstanceItem item = new FlowModels.InstanceItem();
        item.setInstanceId(instance.getId());
        item.setBizType(instance.getBizType());
        item.setBizId(instance.getBizId());
        item.setBizTitle(instance.getBizTitle());
        item.setStatus(instance.getStatus());
        item.setCurrentNodes(instance.getCurrentNodes());
        item.setSubmitterName(instance.getSubmitterName());
        item.setSubmitTime(str(instance.getSubmitTime()));
        item.setFinishTime(str(instance.getFinishTime()));
        item.setDefVersion(instance.getDefVersion());
        return item;
    }

    /**
     * 流程轨迹（2026-09-18 重排为"时间流"）：审批任务行 + 留痕事件行（6 发起/重新提交、7 撤回）
     * 合成一条按时间升序的轨迹，替掉原先"按 id 升序"的排法（id 序在撤回重走场景下与
     * 真实发生顺序不一致）。
     *
     * <p>2026-09-23 并入抄送行（flw_cc，kind=CC）：NOTIFY 节点不建任务，若不并入则抄送在
     * 轨迹上不可见；按 sentTime 与任务行同场归位、参与轮次进位（退回重走的第 N 轮抄送）。
     *
     * <p>2026-09-24 并入路由判断行（flw_route_log，kind=ROUTE）：CONDITION 判断留痕
     * "系统判断 → 出口"（outlet=NULL 渲染为挂起）；按 decideTime 同场归位。
     *
     * <p>每条行补四个前端直接用、不再自行推断的字段：
     * <ul>
     *   <li>{@code time} 该行实际发生的时间（已办/退回/移交/撤回=handleTime，在办/失效=arriveTime，抄送=sentTime，判断=decideTime）；</li>
     *   <li>{@code kind} SUBMIT|RESUBMIT|WITHDRAW|APPROVE|REJECT|RETURN|TRANSFER|INVALID|PENDING|CC|ROUTE
     *       （前端配色与文案的唯一依据）；</li>
     *   <li>{@code round} 第几轮审批（遇"重新提交"进位，撤回属于它结束的那一轮）；</li>
     *   <li>{@code rowKey} 去重 key（任务行 t{id}、抄送行 cc{id}、合成行 submit —— taskId 可能为 null 不能当 key）。</li>
     * </ul>
     * 科室口径（视图两档：dept/user）另需 assigneeType/deptKey/deptName —— 只有 DEPT_KEY 节点有
     * 科室概念，故仅对该类节点回填；节点在定义里找不到（重提后老节点、留痕事件行）不回填，
     * 前端回落人名显示。
     *
     * <p>老办件（改造前发起）没有"发起"留痕行，按办件快照的 submitTime/submitterName 合成一条
     * 兜底插入到时间流对应位置，保证轨迹首条仍是"发起申请"。
     */
    private List<Map<String, Object>> buildTrace(FlwInstance instance, List<FlwTask> tasks,
                                                 List<FlwCc> ccs, List<FlwRouteLog> routeLogs,
                                                 FlowDefModel model) {
        // 任务行、判断行与抄送行同场按发生时间排序：时间只到秒（DATETIME），同秒平局任务行恒在前、
        // 判断行次之（办理→判断→抄送的因果序）、抄送行最后（秩隔开跨表 id 空间；稳排保证同源行相对次序不变）。
        // 无判断/抄送的办件所有行 source 恒 0，排序与旧版 (time,id) 严格等价——
        // 不能给任务行再分因果秩：驳回行与重提行同秒是常态，旧序按 id（真实先后），秩会颠倒。
        List<TimedRow> rows = new ArrayList<>();
        Map<String, String> deptNames = new HashMap<>();
        for (FlwTask t : tasks) {
            rows.add(new TimedRow(happenedAt(t), 0, t.getId(),
                    taskTraceRow(t, model, instance, deptNames)));
        }
        for (FlwRouteLog r : routeLogs) {
            rows.add(new TimedRow(r.getDecideTime(), 1, r.getId(), routeTraceRow(r)));
        }
        for (FlwCc c : ccs) {
            rows.add(new TimedRow(c.getSentTime(), 2, c.getId(),
                    ccTraceRow(c, model, instance, deptNames)));
        }
        rows.sort(Comparator.comparing((TimedRow r) -> r.time,
                        Comparator.nullsLast(Comparator.naturalOrder()))
                .thenComparing(r -> r.source)
                .thenComparing(r -> r.seq));
        List<Map<String, Object>> trace = new ArrayList<>();
        int headIndex = 0;
        LocalDateTime submitTime = instance.getSubmitTime();
        for (TimedRow r : rows) {
            trace.add(r.row);
            // 老办件兜底行的插入位：时间早于提交时间的行数（老办件里恒为 0；重提过的老办件按时间放在中段）
            if (submitTime != null && r.time != null && r.time.isBefore(submitTime)) {
                headIndex = trace.size();
            }
        }
        if (!hasSubmitRow(tasks)) {
            trace.add(headIndex, syntheticSubmitRow(instance));
        }
        int round = 1;
        for (Map<String, Object> row : trace) {
            if ("RESUBMIT".equals(row.get("kind"))) {
                round++;
            }
            row.put("round", round);
        }
        return trace;
    }

    private Map<String, Object> taskTraceRow(FlwTask t, FlowDefModel model, FlwInstance instance,
                                             Map<String, String> deptNames) {
        Map<String, Object> row = new HashMap<>();
        row.put("rowKey", "t" + t.getId());
        row.put("taskId", t.getId());
        row.put("kind", kindOf(t));
        row.put("nodeId", t.getNodeId());
        row.put("nodeName", t.getNodeName());
        row.put("assigneeId", t.getAssigneeId());
        row.put("assigneeName", t.getAssigneeName());
        row.put("status", t.getStatus());
        row.put("opinion", t.getOpinion());
        row.put("arriveTime", str(t.getArriveTime()));
        row.put("handleTime", str(t.getHandleTime()));
        row.put("time", str(happenedAt(t)));
        row.put("deadline", str(t.getDeadline()));
        row.put("urgeCount", t.getUrgeCount());
        row.put("edgeName", t.getEdgeName());
        fillAssigneeScope(row, model, t.getNodeId(), instance.getSchId(), deptNames);
        return row;
    }

    /** 抄送轨迹行（kind=CC）：no taskId/opinion，接收人记在 assignee* 字段（前端复用人列）。
     *  2026-10-12 补科室口径：抄送节点用 receivers，走 {@link #fillCcScope} 富化 assigneeType，
     *  前端 dept 档据此显科室名 / "抄送对象"，不再回落接收人真实姓名。 */
    private Map<String, Object> ccTraceRow(FlwCc c, FlowDefModel model, FlwInstance instance,
                                           Map<String, String> deptNames) {
        Map<String, Object> row = new HashMap<>();
        row.put("rowKey", "cc" + c.getId());
        row.put("ccId", c.getId());
        row.put("kind", "CC");
        row.put("nodeId", c.getNodeId());
        row.put("nodeName", c.getNodeName() == null || c.getNodeName().isEmpty() ? "抄送" : c.getNodeName());
        row.put("assigneeId", c.getUserId());
        row.put("assigneeName", c.getUserName());
        row.put("status", null);
        row.put("time", str(c.getSentTime()));
        fillCcScope(row, model, c.getNodeId(), instance.getSchId(), deptNames);
        return row;
    }

    /** 路由判断轨迹行（kind=ROUTE，2026-09-24）："系统判断 → 出口"，outlet=NULL 渲染为挂起 */
    private static Map<String, Object> routeTraceRow(FlwRouteLog r) {
        Map<String, Object> row = new HashMap<>();
        row.put("rowKey", "r" + r.getId());
        row.put("routeLogId", r.getId());
        row.put("kind", "ROUTE");
        row.put("nodeId", r.getNodeId());
        row.put("nodeName", r.getNodeName() == null || r.getNodeName().isEmpty() ? "条件判断" : r.getNodeName());
        row.put("routerKey", r.getRouterKey());
        row.put("outlet", r.getOutlet());
        row.put("attempt", r.getAttempt());
        row.put("status", null);
        row.put("time", str(r.getDecideTime()));
        // 议题三②：调试弹窗「从路由日志导入」需要看失败摘要（>500 截断）
        row.put("rawResponse", r.getRawResponse() == null ? "" :
                (r.getRawResponse().length() > 500 ? r.getRawResponse().substring(0, 500) + "…" : r.getRawResponse()));
        return row;
    }

    /** 排序载体：发生时间 + 来源秩（任务 0/判断 1/抄送 2）+ 同表内序（id），跨表 id 不比大小 */
    private static final class TimedRow {
        final LocalDateTime time;
        final int source;
        final long seq;
        final Map<String, Object> row;

        TimedRow(LocalDateTime time, int source, long seq, Map<String, Object> row) {
            this.time = time;
            this.source = source;
            this.seq = seq;
            this.row = row;
        }
    }

    private static boolean hasSubmitRow(List<FlwTask> tasks) {
        for (FlwTask t : tasks) {
            if (FlwEnums.TaskStatus.NODE_SUBMIT.equals(t.getNodeId())) {
                return true;
            }
        }
        return false;
    }

    /** 老办件兜底：改造前发起不留痕，用快照补一条"发起申请"（taskId 为空，前端按 rowKey 去重） */
    private static Map<String, Object> syntheticSubmitRow(FlwInstance instance) {
        Map<String, Object> row = new HashMap<>();
        row.put("rowKey", "submit");
        row.put("taskId", null);
        row.put("kind", "SUBMIT");
        row.put("nodeId", FlwEnums.TaskStatus.NODE_SUBMIT);
        row.put("nodeName", "发起申请");
        row.put("assigneeId", instance.getSubmitterId());
        row.put("assigneeName", instance.getSubmitterName());
        row.put("status", FlwEnums.TaskStatus.SUBMITTED.getCode());
        row.put("time", str(instance.getSubmitTime()));
        row.put("synthetic", true);
        return row;
    }

    /** 该行实际发生的时间：办结过看 handleTime，否则看 arriveTime */
    private static LocalDateTime happenedAt(FlwTask t) {
        return t.getHandleTime() != null ? t.getHandleTime() : t.getArriveTime();
    }

    private static String kindOf(FlwTask t) {
        int s = t.getStatus() == null ? FlwEnums.TaskStatus.PENDING.getCode() : t.getStatus();
        if (s == FlwEnums.TaskStatus.SUBMITTED.getCode()) {
            return FlwEnums.TaskStatus.NODE_RESUBMIT.equals(t.getNodeId()) ? "RESUBMIT" : "SUBMIT";
        }
        if (s == FlwEnums.TaskStatus.WITHDRAWN.getCode()) {
            return "WITHDRAW";
        }
        if (s == FlwEnums.TaskStatus.APPROVED.getCode()) {
            return "APPROVE";
        }
        if (s == FlwEnums.TaskStatus.REJECTED.getCode()) {
            return "REJECT";
        }
        if (s == FlwEnums.TaskStatus.INVALIDATED.getCode()) {
            return "INVALID";
        }
        if (s == FlwEnums.TaskStatus.RETURNED.getCode()) {
            return "RETURN";
        }
        if (s == FlwEnums.TaskStatus.TRANSFERRED.getCode()) {
            return "TRANSFER";
        }
        return "PENDING";
    }

    /**
     * 科室口径富化：节点是 DEPT_KEY（科室办理）时带上 deptKey + 映射里的科室名，
     * 前端"按科室显示"据此把人名换成科室名；USERS（指定人员）节点只带 assigneeType，
     * 由前端显示"指定办理人"（口径同示意图的科室视图）。
     */
    private void fillAssigneeScope(Map<String, Object> row, FlowDefModel model, String nodeId,
                                   Long schId, Map<String, String> deptNames) {
        FlowDefModel.Node node = model == null ? null : model.node(nodeId);
        FlowDefModel.Assignee assignee = node == null ? null : node.assignee;
        applyAssigneeScope(row, assignee, schId, deptNames);
    }

    /**
     * 抄送行（kind=CC）科室口径富化（2026-10-12）：NOTIFY 节点的接收人存在 {@code receivers}
     * 字段而非 {@code assignee}，故不能直接复用 {@link #fillAssigneeScope}——否则取到的 assignee
     * 恒为 null，dept 档下抄送行只能回落接收人真实姓名（原先的泄露点）。
     * 节点在定义里找不到（重提后的老节点、已删节点）不填，前端统一显示"抄送对象"。
     */
    private void fillCcScope(Map<String, Object> row, FlowDefModel model, String nodeId,
                             Long schId, Map<String, String> deptNames) {
        FlowDefModel.Node node = model == null ? null : model.node(nodeId);
        FlowDefModel.Assignee receivers = node == null ? null : node.receivers;
        applyAssigneeScope(row, receivers, schId, deptNames);
    }

    /** 两种口径的公共落值：assigneeType 必填；DEPT_KEY 另填 deptKey + 映射里的科室名 */
    private void applyAssigneeScope(Map<String, Object> row, FlowDefModel.Assignee assignee,
                                    Long schId, Map<String, String> deptNames) {
        if (assignee == null || assignee.type == null) {
            return;
        }
        row.put("assigneeType", assignee.type);
        if (!FlowDefModel.ASSIGNEE_DEPT_KEY.equals(assignee.type) || assignee.deptKey == null) {
            return;
        }
        row.put("deptKey", assignee.deptKey);
        String deptName = deptNames.computeIfAbsent(assignee.deptKey,
                k -> DeptLabelSupport.deptName(deptAdminService, schId, k));
        if (deptName != null) {
            row.put("deptName", deptName);
        }
    }

    private FlowModels.TaskItem toTaskItem(FlwTask t) {
        FlowModels.TaskItem item = new FlowModels.TaskItem();
        item.setTaskId(t.getId());
        item.setInstanceId(t.getInstanceId());
        item.setNodeId(t.getNodeId());
        item.setNodeName(t.getNodeName());
        item.setAssigneeName(t.getAssigneeName());
        item.setStatus(t.getStatus());
        item.setOpinion(t.getOpinion());
        item.setArriveTime(str(t.getArriveTime()));
        item.setHandleTime(str(t.getHandleTime()));
        item.setDeadline(str(t.getDeadline()));
        item.setUrgeCount(t.getUrgeCount());
        return item;
    }

    private void fillInstanceInfo(List<FlowModels.TaskItem> items) {
        for (FlowModels.TaskItem item : items) {
            FlwInstance instance = instanceRepository.findById(item.getInstanceId()).orElse(null);
            if (instance != null) {
                item.setBizTitle(instance.getBizTitle());
                item.setBizType(instance.getBizType());
                item.setBizId(instance.getBizId());
                item.setInstanceStatus(instance.getStatus());
                item.setSubmitterName(instance.getSubmitterName());
            }
        }
    }

    /**
     * 展示时间统一截断到秒：时间列已升毫秒精度（DATETIME(3)，轨迹交织排序用），
     * 对外展示口径保持秒级不变（存量前端零适配）；排序用未截断的原值。
     */
    private static String str(LocalDateTime t) {
        return t == null ? null : t.truncatedTo(java.time.temporal.ChronoUnit.SECONDS).toString();
    }

    private static int normPage(Integer page) {
        return page == null || page < 1 ? 0 : page - 1;
    }

    /** 空串按「不过滤」处理（前端清筛选可能传空值，避免误筛成空列表） */
    private static String emptyToNull(String s) {
        return s == null || s.trim().isEmpty() ? null : s.trim();
    }

    private static int normSize(Integer size) {
        return size == null || size < 1 || size > 100 ? 10 : size;
    }

    private static <T> BasePageResult<T> toResult(long total, List<T> content, Integer page, Integer size) {
        int pageIndex = page == null || page < 1 ? 1 : page;
        int pageSize = size == null || size < 1 || size > 100 ? 10 : size;
        int totalPages = (int) Math.ceil(total / (double) pageSize);
        return new BasePageResult<>(content, (int) total, pageIndex, pageSize, totalPages,
                pageIndex < totalPages);
    }
}