const { z } = require("zod");
const { AppError } = require("../utils/AppError");
const { sendData } = require("../utils/reply");
const { buildAuditLogData } = require("../utils/audit");
const { currentDateString, parseDateOnlyString } = require("../utils/date");
const { findActiveDelegationForDelegate } = require("../utils/delegation");
const {
  createNotifications,
  resolveRecipientsForAssignee,
} = require("../services/notifications");
const {
  buildPendingTaskCopy,
  buildWorkflowEntityMeta,
} = require("../services/notifications/workflowCopy");
const { enqueueImNotifications } = require("../services/notifications/imEnqueue");
const { NOTIFICATION_TYPES } = require("../constants/notificationTypes");
const { sendNotificationEmailSafe } = require("../services/email");
const { enqueueReimbursementJournalExport } = require("../services/integrations/erpJournal");
const { FEATURE_FLAG_KEYS, evaluateFeatureFlag } = require("../services/featureFlags");
const { ensureCutoverAllowed } = require("../services/cutover");
const { resolveApplicableBudgetPoolByContext } = require("../services/budgetPool");
const {
  buildPersistedRiskFlag,
  buildReimbursementPrecheck,
  createRiskFlagsFromPrecheck,
} = require("../services/feeControl");
const { issueDocumentNumber } = require("../services/documentSequence");
const {
  buildWorkflowStepsFromApprovalRule,
  getWorkflowStepsSnapshot,
  resolveActionableStep,
  toMoneyString,
} = require("../utils/workflow");

const UUID_SCHEMA = z.string().uuid();
const PAY_BODY_SCHEMA = z.object({
  paymentVoucherNo: z.string().trim().min(1).max(50).optional(),
  paymentDate: z.string().regex(/^\d{4}-\d{2}-\d{2}$/).optional(),
  paymentChannel: z.enum(["bank", "alipay", "wechat", "cash", "other"]).optional(),
});

const REIMBURSEMENT_LIST_QUERY_SCHEMA = z.object({
  page: z.coerce.number().int().min(1).optional(),
  pageSize: z.coerce.number().int().min(1).max(100).optional(),
  status: z
    .enum(["draft", "reviewing", "approved", "paid", "rejected", "cancelled"])
    .optional(),
  scope: z.enum(["own", "all"]).optional(),
});

const REIMBURSEMENT_UPDATE_BODY_SCHEMA = z.object({
  reimbursementDate: z.string().regex(/^\d{4}-\d{2}-\d{2}$/).optional(),
  description: z.string().trim().max(500).nullable().optional(),
});

const REIMBURSEMENT_ITEM_BODY_SCHEMA = z.object({
  expenseTypeId: z.string().uuid(),
  expenseDate: z.string().regex(/^\d{4}-\d{2}-\d{2}$/),
  amount: z.string().regex(/^\d+(\.\d{1,2})?$/),
  description: z.string().trim().min(1).max(500),
});

function ensureOwnOrCanViewAll(fastify, request, reimbursement) {
  const canViewAll = fastify.hasPermission(request.employee, "expense.view_all");
  if (canViewAll) {
    return;
  }

  if (!fastify.hasPermission(request.employee, "expense.view_own")) {
    throw new AppError({
      code: "PERM_001",
      message: "无权限",
      statusCode: 403,
    });
  }

  const isOwn =
    reimbursement.owner_id === request.employee.id ||
    reimbursement.submitter_id === request.employee.id;
  if (!isOwn) {
    throw new AppError({
      code: "PERM_001",
      message: "无权限",
      statusCode: 403,
    });
  }
}

function buildWorkflowProgress(workflowInstance, historyItems = []) {
  if (!workflowInstance?.current_step_id) {
    return null;
  }

  const steps = getWorkflowStepsSnapshot(workflowInstance);
  const currentStepIndex = steps.findIndex((step) => step.id === workflowInstance.current_step_id);
  if (currentStepIndex < 0) {
    return null;
  }

  const skippedStepIds = new Set(
    historyItems
      .filter((item) => item.action === "skip" && item.payload?.step_id)
      .map((item) => String(item.payload.step_id)),
  );

  return {
    currentStepIndex,
    totalSteps: steps.length,
    steps: steps.map((step, index) => ({
      id: step.id,
      name: step.name ?? step.id,
      status: skippedStepIds.has(step.id) || index < currentStepIndex
        ? "completed"
        : index === currentStepIndex
          ? "current"
          : "pending",
    })),
  };
}

function ensureApplicantOrAdmin(request, reimbursement) {
  if (request.employee?.roleCodes?.includes("admin")) {
    return;
  }

  const isApplicant =
    reimbursement.owner_id === request.employee.id ||
    reimbursement.submitter_id === request.employee.id;

  if (!isApplicant) {
    throw new AppError({
      code: "PERM_001",
      message: "无权限",
      statusCode: 403,
    });
  }
}

function parseWithdrawBody(body) {
  const bodySchema = z.object({
    comment: z.string().trim().min(1).max(500).optional(),
  });

  const parsed = bodySchema.safeParse(body ?? {});
  if (!parsed.success) {
    throw new AppError({
      code: "VALID_001",
      message: "参数校验失败",
      statusCode: 400,
      details: parsed.error.flatten(),
    });
  }

  return parsed.data;
}

function parseReimbursementId(id) {
  const parsed = UUID_SCHEMA.safeParse(id);
  if (!parsed.success) {
    throw new AppError({
      code: "VALID_001",
      message: "参数校验失败",
      statusCode: 400,
      details: { id: "invalid_uuid" },
    });
  }

  return parsed.data;
}

function parseReimbursementUpdateBody(body) {
  const parsed = REIMBURSEMENT_UPDATE_BODY_SCHEMA.safeParse(body ?? {});
  if (!parsed.success) {
    throw new AppError({
      code: "VALID_001",
      message: "参数校验失败",
      statusCode: 400,
      details: parsed.error.flatten(),
    });
  }

  if (!Object.keys(parsed.data).length) {
    throw new AppError({
      code: "VALID_001",
      message: "参数校验失败",
      statusCode: 400,
      details: { body: "empty" },
    });
  }

  return parsed.data;
}

function parseItemBody(body) {
  const parsed = REIMBURSEMENT_ITEM_BODY_SCHEMA.safeParse(body ?? {});
  if (!parsed.success) {
    throw new AppError({
      code: "VALID_001",
      message: "参数校验失败",
      statusCode: 400,
      details: parsed.error.flatten(),
    });
  }

  const amountNumber = Number(parsed.data.amount);
  if (!Number.isFinite(amountNumber) || amountNumber < 0) {
    throw new AppError({
      code: "VALID_001",
      message: "参数校验失败",
      statusCode: 400,
      details: { amount: "invalid" },
    });
  }

  return parsed.data;
}

function parsePayBody(body) {
  const parsed = PAY_BODY_SCHEMA.safeParse(body ?? {});
  if (!parsed.success) {
    throw new AppError({
      code: "VALID_001",
      message: "参数校验失败",
      statusCode: 400,
      details: parsed.error.flatten(),
    });
  }

  return parsed.data;
}

function parseReimbursementListQuery(query) {
  const parsed = REIMBURSEMENT_LIST_QUERY_SCHEMA.safeParse(query ?? {});
  if (!parsed.success) {
    throw new AppError({
      code: "VALID_001",
      message: "参数校验失败",
      statusCode: 400,
      details: parsed.error.flatten(),
    });
  }

  return {
    page: parsed.data.page ?? 1,
    pageSize: parsed.data.pageSize ?? 20,
    status: parsed.data.status,
    scope: parsed.data.scope,
  };
}

function buildOwnScopeWhere(employeeId) {
  return {
    OR: [{ owner_id: employeeId }, { submitter_id: employeeId }],
  };
}

function isGlobalViewRole(roleCodes) {
  return roleCodes.some((code) =>
    ["admin", "ceo", "finance", "finance_mgr", "hr"].includes(code),
  );
}

function buildViewAllScopeWhere(request) {
  if (isGlobalViewRole(request.employee.roleCodes ?? [])) {
    return {};
  }

  return {
    OR: [
      { owner_id: request.employee.id },
      { submitter_id: request.employee.id },
      { owner: { direct_manager_id: request.employee.id } },
    ],
  };
}

function mapReimbursementSummary(item) {
  return {
    id: item.id,
    formNumber: item.form_number,
    status: item.status,
    reimbursementDate: item.reimbursement_date?.toISOString?.()?.slice(0, 10) ?? null,
    totalAmount: toMoneyString(item.total_amount),
    description: item.description,
    payment: {
      paymentVoucherNo: item.payment_voucher_no,
      paymentDate: item.payment_date?.toISOString?.()?.slice(0, 10) ?? null,
      paymentChannel: item.payment_channel,
      paidAt: item.paid_at?.toISOString?.() ?? null,
      paidBy: item.paid_by,
    },
    owner: item.owner
      ? {
        id: item.owner.id,
        employeeNo: item.owner.employee_no,
        name: item.owner.name,
      }
      : null,
    submitter: item.submitter
      ? {
        id: item.submitter.id,
        employeeNo: item.submitter.employee_no,
        name: item.submitter.name,
      }
      : null,
    createdAt: item.created_at?.toISOString?.() ?? null,
    updatedAt: item.updated_at?.toISOString?.() ?? null,
    project: item.project
      ? {
        id: item.project.id,
        projectNo: item.project.project_no,
        name: item.project.name,
      }
      : null,
  };
}

function toDateOnlyString(dateValue) {
  if (!dateValue) {
    return null;
  }

  if (typeof dateValue === "string") {
    return dateValue.slice(0, 10);
  }

  return new Date(dateValue).toISOString().slice(0, 10);
}

function ensureNonNegativeAmount(totalAmount) {
  const asNumber = Number(totalAmount);
  if (!Number.isFinite(asNumber)) {
    throw new AppError({
      code: "VALID_001",
      message: "参数校验失败",
      statusCode: 400,
      details: { total_amount: "invalid" },
    });
  }

  if (asNumber < 0) {
    throw new AppError({
      code: "VALID_001",
      message: "参数校验失败",
      statusCode: 400,
      details: { total_amount: "negative_not_allowed" },
    });
  }
}

async function recomputeTotalAmount(tx, reimbursementId, actorId) {
  const aggregate = await tx.reimbursementItem.aggregate({
    where: { reimbursement_id: reimbursementId },
    _sum: { amount: true },
  });

  const nextTotal = aggregate._sum.amount ?? "0";
  await tx.reimbursementForm.update({
    where: { id: reimbursementId },
    data: {
      total_amount: nextTotal,
      updated_by: actorId,
    },
  });

  return nextTotal;
}

async function loadApprovalRuleForAmount(tx, totalAmount) {
  const amountString = toMoneyString(totalAmount);
  const approvalRule = await tx.approvalRule.findFirst({
    where: {
      enabled: true,
      min_amount: { lte: amountString },
      OR: [{ max_amount: null }, { max_amount: { gt: amountString } }],
    },
    orderBy: { priority: "asc" },
    select: {
      id: true,
      level1_role: true,
      level2_role: true,
      level3_role: true,
      priority: true,
    },
  });

  if (!approvalRule) {
    throw new AppError({
      code: "VALID_001",
      message: "参数校验失败",
      statusCode: 409,
      details: { workflow: "missing_approval_rule" },
    });
  }

  return approvalRule;
}

async function resolveApplicableBudgetPool(tx, reimbursement) {
  return resolveApplicableBudgetPoolByContext(tx, {
    departmentId: reimbursement.department_id,
    effectiveDate: reimbursement.reimbursement_date,
  });
}

function normalizeBudgetControlMode(config) {
  const mode = String(config.budgetControlMode ?? "warn").toLowerCase();
  if (mode === "block") {
    return "block";
  }
  return "warn";
}

function buildBudgetHint(budgetPool, reimbursementAmount, controlMode) {
  const allocatedAmount = Number(budgetPool.allocated_amount ?? 0);
  const usedAmount = Number(budgetPool.used_amount ?? 0);
  const currentAmount = Number(reimbursementAmount ?? 0);
  const nextUsed = usedAmount + currentAmount;
  const nextUsagePercent = allocatedAmount > 0 ? (nextUsed / allocatedAmount) * 100 : 0;

  return {
    budgetId: budgetPool.id,
    budgetCode: budgetPool.code,
    budgetName: budgetPool.name,
    controlMode,
    warningThresholdPercent: budgetPool.warning_threshold_percent,
    allocatedAmount: allocatedAmount.toFixed(2),
    usedAmount: usedAmount.toFixed(2),
    remainingAmount: Math.max(0, allocatedAmount - usedAmount).toFixed(2),
    currentAmount: currentAmount.toFixed(2),
    nextUsedAmount: nextUsed.toFixed(2),
    nextUsagePercent: Number(nextUsagePercent.toFixed(2)),
    exceedsThreshold: nextUsagePercent >= budgetPool.warning_threshold_percent,
    exceedsBudget: nextUsed > allocatedAmount,
  };
}

function buildDisabledPrecheck(entityType, entityId) {
  return {
    entityType,
    entityId,
    decision: "pass",
    matchedBudgetControlRule: null,
    budgetHint: null,
    warnings: [],
    blockingReasons: [],
    riskFlags: [],
    nextActions: ["功能未开启，沿用当前提交流程"],
  };
}

function buildPrecheckBlockedError(precheck) {
  return new AppError({
    code: "VALID_001",
    message: "参数校验失败",
    statusCode: 409,
    details: {
      precheck: precheck.blockingReasons,
    },
  });
}

function buildSkippedNotificationResult(reason) {
  return { skipped: true, reason };
}

function buildSkippedImResult(reason) {
  return { queued: 0, duplicated: 0, matchedChannels: [], skippedReason: reason };
}

function buildSkippedEmailResult(reason, failed = 0) {
  return { skipped: true, reason, sent: 0, failed };
}

async function loadReimbursementSubmitSummary(prisma, reimbursementId) {
  return prisma.reimbursementForm.findUnique({
    where: { id: reimbursementId },
    select: {
      id: true,
      form_number: true,
      total_amount: true,
      owner: {
        select: {
          id: true,
          name: true,
        },
      },
    },
  });
}

async function finalizeReimbursementSubmitSideEffects({
  prisma,
  config,
  logger,
  requestId,
  reimbursementId,
  formNumber,
  workflowTaskId,
  assigneeId,
  assigneeRole,
  actorId,
  loadSummary = loadReimbursementSubmitSummary,
  resolveRecipients = resolveRecipientsForAssignee,
  createAppNotifications = createNotifications,
  enqueueIm = enqueueImNotifications,
  sendEmailSafe = sendNotificationEmailSafe,
}) {
  let copy = buildPendingTaskCopy(
    buildWorkflowEntityMeta("reimbursement", { form_number: formNumber }, reimbursementId),
  );
  try {
    const summary = await loadSummary(prisma, reimbursementId);
    copy = buildPendingTaskCopy(
      buildWorkflowEntityMeta(
        "reimbursement",
        {
          ...summary,
          form_number: summary?.form_number ?? formNumber,
        },
        reimbursementId,
      ),
    );
  } catch (error) {
    logger?.error?.(
      {
        err: error,
        requestId,
        reimbursementId,
      },
      "Failed to load reimbursement submit notification summary",
    );
  }

  const { title, body } = copy;
  const targetPath = `/workflow/tasks/${workflowTaskId}`;

  let recipientEmployeeIds = [];
  try {
    recipientEmployeeIds = await resolveRecipients(prisma, {
      assigneeId,
      assigneeRole,
    });
  } catch (error) {
    logger?.error?.(
      {
        err: error,
        requestId,
        reimbursementId,
        workflowTaskId,
      },
      "Failed to resolve reimbursement submit notification recipients",
    );
    return {
      recipientEmployeeIds: [],
      notification: buildSkippedNotificationResult("recipient_resolution_failed"),
      im: buildSkippedImResult("recipient_resolution_failed"),
      email: buildSkippedEmailResult("recipient_resolution_failed"),
    };
  }

  if (!recipientEmployeeIds.length) {
    return {
      recipientEmployeeIds: [],
      notification: buildSkippedNotificationResult("no_recipients"),
      im: buildSkippedImResult("no_recipients"),
      email: buildSkippedEmailResult("no_recipients"),
    };
  }

  let notification = buildSkippedNotificationResult("not_attempted");
  try {
    notification = await createAppNotifications(prisma, {
      recipientEmployeeIds,
      type: NOTIFICATION_TYPES.workflowTaskAssigned,
      title,
      body,
      targetType: "workflow_task",
      targetId: workflowTaskId,
    });
  } catch (error) {
    logger?.error?.(
      {
        err: error,
        requestId,
        reimbursementId,
        workflowTaskId,
        recipients: recipientEmployeeIds.length,
      },
      "Failed to create reimbursement submit notifications",
    );
    notification = buildSkippedNotificationResult("notification_failed");
  }

  let im = buildSkippedImResult("not_attempted");
  try {
    im = await enqueueIm(prisma, {
      config,
      logger,
      recipientEmployeeIds,
      type: NOTIFICATION_TYPES.workflowTaskAssigned,
      title,
      body,
      targetType: "workflow_task",
      targetId: workflowTaskId,
      targetPath,
      entityType: "reimbursement",
      entityId: reimbursementId,
      actorId,
    });
  } catch (error) {
    logger?.error?.(
      {
        err: error,
        requestId,
        reimbursementId,
        workflowTaskId,
        recipients: recipientEmployeeIds.length,
      },
      "Failed to enqueue reimbursement submit IM notifications",
    );
    im = buildSkippedImResult("enqueue_im_failed");
  }

  let email = buildSkippedEmailResult("not_attempted");
  try {
    const emailResult = await sendEmailSafe({
      prisma,
      config,
      logger,
      requestId,
      recipientEmployeeIds,
      subject: title,
      body,
      type: NOTIFICATION_TYPES.workflowTaskAssigned,
      targetPath,
    });
    email = emailResult?.email ?? emailResult ?? buildSkippedEmailResult("empty_email_result");
  } catch (error) {
    logger?.error?.(
      {
        err: error,
        requestId,
        reimbursementId,
        workflowTaskId,
        recipients: recipientEmployeeIds.length,
      },
      "Failed to send reimbursement submit notification email",
    );
    email = buildSkippedEmailResult("email_failed", recipientEmployeeIds.length);
  }

  return {
    recipientEmployeeIds,
    notification,
    im,
    email,
  };
}

async function reimbursementRoutes(fastify) {
  const createBodySchema = z.object({
    ownerEmployeeId: z.string().uuid().optional(),
    reimbursementDate: z.string().regex(/^\d{4}-\d{2}-\d{2}$/).optional(),
    description: z.string().max(500).optional(),
  });

  fastify.post(
    "/reimbursements",
    {
      schema: { tags: ["Reimbursements"], summary: "Create Reimbursement" },
      preHandler: fastify.requirePermission("expense.create"),
    },
    async (request, reply) => {
      await ensureCutoverAllowed({
        prisma: fastify.prisma,
        config: fastify.config,
        request,
        domain: "expense",
        departmentId: request.employee.department_id ?? null,
      });
      const parsed = createBodySchema.safeParse(request.body ?? {});
      if (!parsed.success) {
        throw new AppError({
          code: "VALID_001",
          message: "参数校验失败",
          statusCode: 400,
          details: parsed.error.flatten(),
        });
      }

      const reimbursementDate =
        parsed.data.reimbursementDate ?? currentDateString(fastify.config.appTimezone);

      const ownerEmployeeId = parsed.data.ownerEmployeeId ?? request.employee.id;
      const isProxyCreate = ownerEmployeeId !== request.employee.id;

      const reimbursement = await fastify.prisma.$transaction(async (tx) => {
        let departmentId = request.employee.department_id;
        let delegationGrantId = null;

        if (isProxyCreate) {
          const isAdministration = request.employee.roleCodes?.includes("administration");
          const canProxySubmit = fastify.hasPermission(request.employee, "expense.proxy_submit");
          if (!isAdministration || !canProxySubmit) {
            throw new AppError({
              code: "PERM_001",
              message: "无权限",
              statusCode: 403,
            });
          }

          const ownerEmployee = await tx.employee.findUnique({
            where: { id: ownerEmployeeId },
            select: { id: true, status: true, department_id: true },
          });
          if (!ownerEmployee || ownerEmployee.status !== "active") {
            throw new AppError({
              code: "VALID_001",
              message: "参数校验失败",
              statusCode: 409,
              details: { ownerEmployeeId: "invalid_owner" },
            });
          }

          const delegation = await findActiveDelegationForDelegate(tx, {
            principalEmployeeId: ownerEmployeeId,
            delegateEmployeeId: request.employee.id,
            allowedScopes: ["reimbursement_submit", "all"],
            now: new Date(),
          });
          if (!delegation) {
            throw new AppError({
              code: "PERM_001",
              message: "无权限",
              statusCode: 403,
              details: { delegation: "missing_active_grant" },
            });
          }

          delegationGrantId = delegation.id;
          departmentId = ownerEmployee.department_id;
        }

        const created = await tx.reimbursementForm.create({
          data: {
            submitter_id: request.employee.id,
            owner_id: ownerEmployeeId,
            department_id: departmentId,
            reimbursement_date: parseDateOnlyString(reimbursementDate),
            description: parsed.data.description ?? null,
            created_by: request.employee.id,
            updated_by: request.employee.id,
          },
          select: {
            id: true,
            status: true,
            reimbursement_date: true,
            description: true,
            total_amount: true,
            form_number: true,
            owner_id: true,
            submitter_id: true,
          },
        });

        if (isProxyCreate) {
          await tx.auditLog.create({
            data: buildAuditLogData(request, {
              actorId: request.employee.id,
              action: "REIMBURSEMENT_PROXY_CREATED",
              targetType: "reimbursement_form",
              targetId: created.id,
              extra: {
                ownerEmployeeId,
                submitterEmployeeId: request.employee.id,
                delegationGrantId,
              },
            }),
          });
        }

        return created;
      });

      return sendData(reply, request, {
        id: reimbursement.id,
        formNumber: reimbursement.form_number,
        submitterId: reimbursement.submitter_id,
        ownerId: reimbursement.owner_id,
        reimbursementDate,
        status: reimbursement.status,
        description: reimbursement.description,
        projectId: reimbursement.project_id ?? null,
        project: reimbursement.project ? { id: reimbursement.project.id, projectNo: reimbursement.project.project_no, name: reimbursement.project.name } : null,
        totalAmount: toMoneyString(reimbursement.total_amount),
      });
    },
  );

  fastify.get(
    "/reimbursements",
    {
      schema: { tags: ["Reimbursements"], summary: "List Reimbursements" },
      preHandler: fastify.authenticate,
    },
    async (request, reply) => {
      const query = parseReimbursementListQuery(request.query);
      const canViewOwn = fastify.hasPermission(request.employee, "expense.view_own");
      const canViewAll = fastify.hasPermission(request.employee, "expense.view_all");

      if (!canViewOwn && !canViewAll) {
        throw new AppError({
          code: "PERM_001",
          message: "无权限",
          statusCode: 403,
        });
      }

      const scope = query.scope ?? (canViewAll ? "all" : "own");
      if (scope === "all" && !canViewAll) {
        throw new AppError({
          code: "PERM_001",
          message: "无权限",
          statusCode: 403,
        });
      }

      const skip = (query.page - 1) * query.pageSize;
      const where = {
        ...(query.status ? { status: query.status } : {}),
        ...(scope === "all"
          ? buildViewAllScopeWhere(request)
          : buildOwnScopeWhere(request.employee.id)),
      };

      const [items, total] = await Promise.all([
        fastify.prisma.reimbursementForm.findMany({
          where,
          orderBy: { created_at: "desc" },
          skip,
          take: query.pageSize,
          select: {
            id: true,
            form_number: true,
            status: true,
            reimbursement_date: true,
            total_amount: true,
            description: true,
            payment_voucher_no: true,
            payment_date: true,
            payment_channel: true,
            paid_at: true,
            paid_by: true,
            created_at: true,
            updated_at: true,
            project: { select: { id: true, project_no: true, name: true } },
            owner: {
              select: { id: true, employee_no: true, name: true },
            },
            submitter: {
              select: { id: true, employee_no: true, name: true },
            },
          },
        }),
        fastify.prisma.reimbursementForm.count({ where }),
      ]);

      return sendData(reply, request, {
        page: query.page,
        pageSize: query.pageSize,
        total,
        scope,
        items: items.map(mapReimbursementSummary),
      });
    },
  );

  fastify.get(
    "/reimbursements/:id",
    {
      schema: { tags: ["Reimbursements"], summary: "Get Reimbursement Detail" },
      preHandler: fastify.authenticate,
    },
    async (request, reply) => {
      const reimbursementId = parseReimbursementId(request.params?.id);

      const reimbursement = await fastify.prisma.reimbursementForm.findUnique({
        where: { id: reimbursementId },
        select: {
          id: true,
          form_number: true,
          submitter_id: true,
          owner_id: true,
          department_id: true,
          reimbursement_date: true,
          total_amount: true,
          status: true,
          description: true,
          project_id: true,
          project: { select: { id: true, project_no: true, name: true } },
          owner: {
            select: { id: true, employee_no: true, name: true },
          },
          submitter: {
            select: { id: true, employee_no: true, name: true },
          },
          items: {
            orderBy: { expense_date: "desc" },
            select: {
              id: true,
              expense_type_id: true,
              expense_date: true,
              amount: true,
              description: true,
              expense_type: {
                select: {
                  id: true,
                  code: true,
                  name: true,
                  category: true,
                  enabled: true,
                },
              },
            },
          },
          invoice_pool_items: {
            select: {
              id: true,
              status: true,
              invoice_code: true,
              invoice_number: true,
              total_amount: true,
            },
          },
          workflow_instances: {
            where: { current_status: "pending" },
            orderBy: { created_at: "desc" },
            take: 1,
            select: {
              id: true,
              current_step_id: true,
              current_status: true,
              context_data: true,
              workflow_definition: {
                select: {
                  definition_json: true,
                },
              },
              workflow_tasks: {
                where: { status: "pending" },
                take: 1,
                select: {
                  id: true,
                  step_name: true,
                  assignee_id: true,
                  assignee_role: true,
                },
              },
            },
          },
        },
      });

      if (!reimbursement) {
        throw new AppError({
          code: "SYS_404",
          message: "Not Found",
          statusCode: 404,
        });
      }

      ensureOwnOrCanViewAll(fastify, request, reimbursement);

      const controlMode = normalizeBudgetControlMode(fastify.config);
      const budgetPool = await resolveApplicableBudgetPool(fastify.prisma, reimbursement);
      const budgetHint = budgetPool
        ? buildBudgetHint(budgetPool, reimbursement.total_amount, controlMode)
        : null;

      const pendingInstance = reimbursement.workflow_instances[0] ?? null;
      const pendingTask = pendingInstance?.workflow_tasks?.[0] ?? null;
      const workflowHistory = pendingInstance
        ? await fastify.prisma.workflowHistory.findMany({
            where: { instance_id: pendingInstance.id },
            orderBy: { created_at: "asc" },
            select: {
              action: true,
              payload: true,
            },
          })
        : [];
      const riskFlags = await fastify.prisma.entityRiskFlag.findMany({
        where: {
          entity_type: "reimbursement",
          entity_id: reimbursementId,
          status: "open",
        },
        orderBy: [{ created_at: "desc" }, { id: "desc" }],
      });

      return sendData(reply, request, {
        id: reimbursement.id,
        formNumber: reimbursement.form_number,
        submitterId: reimbursement.submitter_id,
        ownerId: reimbursement.owner_id,
        departmentId: reimbursement.department_id,
        reimbursementDate: reimbursement.reimbursement_date.toISOString().slice(0, 10),
        totalAmount: toMoneyString(reimbursement.total_amount),
        status: reimbursement.status,
        description: reimbursement.description,
        projectId: reimbursement.project_id ?? null,
        project: reimbursement.project ? { id: reimbursement.project.id, projectNo: reimbursement.project.project_no, name: reimbursement.project.name } : null,
        owner: reimbursement.owner,
        submitter: reimbursement.submitter,
        items: reimbursement.items.map((item) => ({
          id: item.id,
          expenseTypeId: item.expense_type_id,
          expenseDate: item.expense_date?.toISOString?.()?.slice(0, 10) ?? null,
          amount: toMoneyString(item.amount),
          description: item.description,
          expenseType: item.expense_type
            ? {
              id: item.expense_type.id,
              code: item.expense_type.code,
              name: item.expense_type.name,
              category: item.expense_type.category,
              enabled: item.expense_type.enabled,
            }
            : null,
        })),
        budgetHint,
        invoices: reimbursement.invoice_pool_items.map((item) => ({
          id: item.id,
          status: item.status,
          invoiceCode: item.invoice_code,
          invoiceNumber: item.invoice_number,
          totalAmount: toMoneyString(item.total_amount),
        })),
        pendingWorkflow: pendingInstance
          ? {
            instanceId: pendingInstance.id,
            stepId: pendingInstance.current_step_id,
            task: pendingTask,
          }
          : null,
        workflowProgress: pendingInstance ? buildWorkflowProgress(pendingInstance, workflowHistory) : null,
        riskFlags: riskFlags.map(buildPersistedRiskFlag),
      });
    },
  );

  fastify.patch(
    "/reimbursements/:id",
    {
      preHandler: fastify.requirePermission("expense.edit_own"),
    },
    async (request, reply) => {
      const reimbursementId = parseReimbursementId(request.params?.id);
      const body = parseReimbursementUpdateBody(request.body);

      const updated = await fastify.prisma.$transaction(async (tx) => {
        const reimbursementRows = await tx.$queryRaw`
          SELECT id, owner_id, submitter_id, status
          FROM "reimbursement_forms"
          WHERE id = ${reimbursementId}::uuid
          FOR UPDATE
        `;

        if (!Array.isArray(reimbursementRows) || reimbursementRows.length === 0) {
          throw new AppError({
            code: "SYS_404",
            message: "Not Found",
            statusCode: 404,
          });
        }

        const reimbursement = reimbursementRows[0];
        ensureApplicantOrAdmin(request, reimbursement);
        await ensureCutoverAllowed({
          prisma: tx,
          config: fastify.config,
          request,
          domain: "expense",
          departmentId: reimbursement.department_id ?? request.employee.department_id ?? null,
        });

        if (!["draft", "rejected"].includes(reimbursement.status)) {
          throw new AppError({
            code: "VALID_001",
            message: "参数校验失败",
            statusCode: 409,
            details: { status: "invalid_edit_status" },
          });
        }

        const nextDescription =
          body.description === undefined ? undefined : body.description?.trim() || null;

        return tx.reimbursementForm.update({
          where: { id: reimbursementId },
          data: {
            ...(body.reimbursementDate
              ? { reimbursement_date: parseDateOnlyString(body.reimbursementDate) }
              : {}),
            ...(body.description !== undefined ? { description: nextDescription } : {}),
            updated_by: request.employee.id,
          },
          select: {
            id: true,
            status: true,
            reimbursement_date: true,
            description: true,
            total_amount: true,
          },
        });
      });

      return sendData(reply, request, {
        id: updated.id,
        status: updated.status,
        reimbursementDate: updated.reimbursement_date.toISOString().slice(0, 10),
        description: updated.description,
        totalAmount: toMoneyString(updated.total_amount),
      });
    },
  );

  fastify.delete(
    "/reimbursements/:id",
    {
      preHandler: fastify.requirePermission("expense.delete_own"),
    },
    async (request, reply) => {
      const reimbursementId = parseReimbursementId(request.params?.id);

      const result = await fastify.prisma.$transaction(async (tx) => {
        const reimbursementRows = await tx.$queryRaw`
          SELECT id, owner_id, submitter_id, status
          FROM "reimbursement_forms"
          WHERE id = ${reimbursementId}::uuid
          FOR UPDATE
        `;

        if (!Array.isArray(reimbursementRows) || reimbursementRows.length === 0) {
          throw new AppError({
            code: "SYS_404",
            message: "Not Found",
            statusCode: 404,
          });
        }

        const reimbursement = reimbursementRows[0];
        ensureApplicantOrAdmin(request, reimbursement);

        if (reimbursement.status !== "draft") {
          throw new AppError({
            code: "VALID_001",
            message: "参数校验失败",
            statusCode: 409,
            details: { status: "invalid_delete_status" },
          });
        }

        const unbound = await tx.invoicePool.updateMany({
          where: {
            linked_reimbursement_id: reimbursementId,
            status: "bound",
          },
          data: {
            status: "available",
            linked_reimbursement_id: null,
            linked_item_id: null,
            updated_by: request.employee.id,
          },
        });

        await tx.reimbursementForm.delete({
          where: { id: reimbursementId },
        });

        return {
          reimbursementId,
          unboundInvoiceCount: unbound.count,
        };
      });

      return sendData(reply, request, {
        reimbursementId: result.reimbursementId,
        outcome: "deleted",
        unboundInvoiceCount: result.unboundInvoiceCount,
      });
    },
  );

  fastify.post(
    "/reimbursements/:id/items",
    {
      preHandler: fastify.requirePermission("expense.edit_own"),
    },
    async (request, reply) => {
      const reimbursementId = parseReimbursementId(request.params?.id);
      const body = parseItemBody(request.body);

      const result = await fastify.prisma.$transaction(async (tx) => {
        const reimbursementRows = await tx.$queryRaw`
          SELECT id, owner_id, submitter_id, status
          FROM "reimbursement_forms"
          WHERE id = ${reimbursementId}::uuid
          FOR UPDATE
        `;
        if (!Array.isArray(reimbursementRows) || reimbursementRows.length === 0) {
          throw new AppError({
            code: "SYS_404",
            message: "Not Found",
            statusCode: 404,
          });
        }

        const reimbursement = reimbursementRows[0];
        ensureApplicantOrAdmin(request, reimbursement);

        if (!["draft", "rejected"].includes(reimbursement.status)) {
          throw new AppError({
            code: "VALID_001",
            message: "参数校验失败",
            statusCode: 409,
            details: { status: "invalid_item_edit_status" },
          });
        }

        const expenseType = await tx.expenseType.findUnique({
          where: { id: body.expenseTypeId },
          select: { id: true, enabled: true },
        });
        if (!expenseType || !expenseType.enabled) {
          throw new AppError({
            code: "VALID_001",
            message: "参数校验失败",
            statusCode: 409,
            details: { expenseTypeId: "invalid_or_disabled" },
          });
        }

        const created = await tx.reimbursementItem.create({
          data: {
            reimbursement_id: reimbursementId,
            expense_type_id: body.expenseTypeId,
            expense_date: parseDateOnlyString(body.expenseDate),
            amount: body.amount,
            description: body.description,
            created_by: request.employee.id,
            updated_by: request.employee.id,
          },
          select: {
            id: true,
            expense_type_id: true,
            expense_date: true,
            amount: true,
            description: true,
          },
        });

        const nextTotal = await recomputeTotalAmount(tx, reimbursementId, request.employee.id);

        return {
          item: created,
          totalAmount: nextTotal,
        };
      });

      return sendData(reply, request, {
        item: {
          id: result.item.id,
          expenseTypeId: result.item.expense_type_id,
          expenseDate: result.item.expense_date.toISOString().slice(0, 10),
          amount: toMoneyString(result.item.amount),
          description: result.item.description,
        },
        totalAmount: toMoneyString(result.totalAmount),
      });
    },
  );

  fastify.patch(
    "/reimbursements/:id/items/:itemId",
    {
      preHandler: fastify.requirePermission("expense.edit_own"),
    },
    async (request, reply) => {
      const reimbursementId = parseReimbursementId(request.params?.id);
      const parsedItemId = UUID_SCHEMA.safeParse(request.params?.itemId);
      if (!parsedItemId.success) {
        throw new AppError({
          code: "VALID_001",
          message: "参数校验失败",
          statusCode: 400,
          details: { itemId: "invalid_uuid" },
        });
      }

      const parsedBody = REIMBURSEMENT_ITEM_BODY_SCHEMA.partial().safeParse(request.body ?? {});
      if (!parsedBody.success) {
        throw new AppError({
          code: "VALID_001",
          message: "参数校验失败",
          statusCode: 400,
          details: parsedBody.error.flatten(),
        });
      }

      if (!Object.keys(parsedBody.data).length) {
        throw new AppError({
          code: "VALID_001",
          message: "参数校验失败",
          statusCode: 400,
          details: { body: "empty" },
        });
      }

      if (typeof parsedBody.data.amount === "string") {
        const amountNumber = Number(parsedBody.data.amount);
        if (!Number.isFinite(amountNumber) || amountNumber < 0) {
          throw new AppError({
            code: "VALID_001",
            message: "参数校验失败",
            statusCode: 400,
            details: { amount: "invalid" },
          });
        }
      }

      const result = await fastify.prisma.$transaction(async (tx) => {
        const reimbursementRows = await tx.$queryRaw`
          SELECT id, owner_id, submitter_id, status
          FROM "reimbursement_forms"
          WHERE id = ${reimbursementId}::uuid
          FOR UPDATE
        `;
        if (!Array.isArray(reimbursementRows) || reimbursementRows.length === 0) {
          throw new AppError({
            code: "SYS_404",
            message: "Not Found",
            statusCode: 404,
          });
        }

        const reimbursement = reimbursementRows[0];
        ensureApplicantOrAdmin(request, reimbursement);

        if (!["draft", "rejected"].includes(reimbursement.status)) {
          throw new AppError({
            code: "VALID_001",
            message: "参数校验失败",
            statusCode: 409,
            details: { status: "invalid_item_edit_status" },
          });
        }

        const item = await tx.reimbursementItem.findFirst({
          where: {
            id: parsedItemId.data,
            reimbursement_id: reimbursementId,
          },
          select: { id: true },
        });
        if (!item) {
          throw new AppError({
            code: "SYS_404",
            message: "Not Found",
            statusCode: 404,
          });
        }

        if (typeof parsedBody.data.expenseTypeId === "string") {
          const expenseType = await tx.expenseType.findUnique({
            where: { id: parsedBody.data.expenseTypeId },
            select: { id: true, enabled: true },
          });
          if (!expenseType || !expenseType.enabled) {
            throw new AppError({
              code: "VALID_001",
              message: "参数校验失败",
              statusCode: 409,
              details: { expenseTypeId: "invalid_or_disabled" },
            });
          }
        }

        const updated = await tx.reimbursementItem.update({
          where: { id: parsedItemId.data },
          data: {
            ...(typeof parsedBody.data.expenseTypeId === "string"
              ? { expense_type_id: parsedBody.data.expenseTypeId }
              : {}),
            ...(typeof parsedBody.data.expenseDate === "string"
              ? { expense_date: parseDateOnlyString(parsedBody.data.expenseDate) }
              : {}),
            ...(typeof parsedBody.data.amount === "string"
              ? { amount: parsedBody.data.amount }
              : {}),
            ...(typeof parsedBody.data.description === "string"
              ? { description: parsedBody.data.description.trim() }
              : {}),
            updated_by: request.employee.id,
          },
          select: {
            id: true,
            expense_type_id: true,
            expense_date: true,
            amount: true,
            description: true,
          },
        });

        const nextTotal = await recomputeTotalAmount(tx, reimbursementId, request.employee.id);

        return {
          item: updated,
          totalAmount: nextTotal,
        };
      });

      return sendData(reply, request, {
        item: {
          id: result.item.id,
          expenseTypeId: result.item.expense_type_id,
          expenseDate: result.item.expense_date.toISOString().slice(0, 10),
          amount: toMoneyString(result.item.amount),
          description: result.item.description,
        },
        totalAmount: toMoneyString(result.totalAmount),
      });
    },
  );

  fastify.delete(
    "/reimbursements/:id/items/:itemId",
    {
      preHandler: fastify.requirePermission("expense.edit_own"),
    },
    async (request, reply) => {
      const reimbursementId = parseReimbursementId(request.params?.id);
      const parsedItemId = UUID_SCHEMA.safeParse(request.params?.itemId);
      if (!parsedItemId.success) {
        throw new AppError({
          code: "VALID_001",
          message: "参数校验失败",
          statusCode: 400,
          details: { itemId: "invalid_uuid" },
        });
      }

      const result = await fastify.prisma.$transaction(async (tx) => {
        const reimbursementRows = await tx.$queryRaw`
          SELECT id, owner_id, submitter_id, status
          FROM "reimbursement_forms"
          WHERE id = ${reimbursementId}::uuid
          FOR UPDATE
        `;
        if (!Array.isArray(reimbursementRows) || reimbursementRows.length === 0) {
          throw new AppError({
            code: "SYS_404",
            message: "Not Found",
            statusCode: 404,
          });
        }

        const reimbursement = reimbursementRows[0];
        ensureApplicantOrAdmin(request, reimbursement);

        if (!["draft", "rejected"].includes(reimbursement.status)) {
          throw new AppError({
            code: "VALID_001",
            message: "参数校验失败",
            statusCode: 409,
            details: { status: "invalid_item_edit_status" },
          });
        }

        const deleted = await tx.reimbursementItem.deleteMany({
          where: {
            id: parsedItemId.data,
            reimbursement_id: reimbursementId,
          },
        });
        if (deleted.count === 0) {
          throw new AppError({
            code: "SYS_404",
            message: "Not Found",
            statusCode: 404,
          });
        }

        const nextTotal = await recomputeTotalAmount(tx, reimbursementId, request.employee.id);

        return { totalAmount: nextTotal };
      });

      return sendData(reply, request, {
        outcome: "deleted",
        totalAmount: toMoneyString(result.totalAmount),
      });
    },
  );

  fastify.post(
    "/reimbursements/:id/precheck",
    {
      preHandler: fastify.requirePermission("expense.submit"),
    },
    async (request, reply) => {
      const reimbursementId = parseReimbursementId(request.params?.id);
      const reimbursement = await fastify.prisma.reimbursementForm.findUnique({
        where: { id: reimbursementId },
        select: { id: true, department_id: true },
      });
      if (!reimbursement) {
        throw new AppError({ code: "SYS_404", message: "Not Found", statusCode: 404 });
      }

      const gate = await evaluateFeatureFlag({
        prisma: fastify.prisma,
        config: fastify.config,
        flagKey: FEATURE_FLAG_KEYS.budgetPrecheck,
        departmentId: reimbursement.department_id ?? request.employee.department_id ?? null,
        strictDepartment: false,
      });

      if (!gate.enabled) {
        return sendData(reply, request, buildDisabledPrecheck("reimbursement", reimbursementId));
      }

      const precheck = await buildReimbursementPrecheck(fastify.prisma, {
        reimbursementId,
        config: fastify.config,
        logger: fastify.log,
      });
      return sendData(reply, request, precheck);
    },
  );

  fastify.post(
    "/reimbursements/:id/submit",
    {
      preHandler: fastify.requirePermission("expense.submit"),
    },
    async (request, reply) => {
      const reimbursementId = parseReimbursementId(request.params?.id);
      const submitResult = await fastify.prisma.$transaction(async (tx) => {
        let budgetCheck = null;
        const reimbursementRows = await tx.$queryRaw`
          SELECT id, owner_id, submitter_id, department_id, reimbursement_date, status, form_number, total_amount
          FROM "reimbursement_forms"
          WHERE id = ${reimbursementId}::uuid
          FOR UPDATE
        `;

        if (!Array.isArray(reimbursementRows) || reimbursementRows.length === 0) {
          throw new AppError({
            code: "SYS_404",
            message: "Not Found",
            statusCode: 404,
          });
        }

        const reimbursement = reimbursementRows[0];
        ensureApplicantOrAdmin(request, reimbursement);

        if (!["draft", "rejected"].includes(reimbursement.status)) {
          throw new AppError({
            code: "VALID_001",
            message: "参数校验失败",
            statusCode: 409,
            details: { status: "invalid_submit_status" },
          });
        }

        ensureNonNegativeAmount(reimbursement.total_amount);

        const activeInstance = await tx.workflowInstance.findFirst({
          where: {
            entity_type: "reimbursement",
            entity_id: reimbursementId,
            current_status: "pending",
          },
          select: { id: true },
        });
        if (activeInstance) {
          throw new AppError({
            code: "VALID_001",
            message: "参数校验失败",
            statusCode: 409,
            details: { submit: "already_in_review" },
          });
        }

        const boundInvoiceCount = await tx.invoicePool.count({
          where: {
            linked_reimbursement_id: reimbursementId,
            status: "bound",
          },
        });
        if (boundInvoiceCount < 1) {
          throw new AppError({
            code: "VALID_001",
            message: "参数校验失败",
            statusCode: 400,
            details: { invoices: "bound_invoice_required" },
          });
        }

        const budgetPrecheckGate = await evaluateFeatureFlag({
          prisma: tx,
          config: fastify.config,
          flagKey: FEATURE_FLAG_KEYS.budgetPrecheck,
          departmentId: reimbursement.department_id ?? request.employee.department_id ?? null,
          strictDepartment: false,
        });
        const authoritativePrecheck = budgetPrecheckGate.enabled
          ? await buildReimbursementPrecheck(tx, {
              reimbursementId,
              config: fastify.config,
              logger: fastify.log,
            })
          : buildDisabledPrecheck("reimbursement", reimbursementId);
        if (authoritativePrecheck.decision === "block") {
          throw buildPrecheckBlockedError(authoritativePrecheck);
        }
        const openedRiskFlags = await createRiskFlagsFromPrecheck(tx, {
          entityType: "reimbursement",
          entityId: reimbursementId,
          actorId: request.employee.id,
          precheck: authoritativePrecheck,
        });

        const budgetPool = await resolveApplicableBudgetPool(tx, reimbursement);
        if (budgetPool) {
          const allocatedAmount = Number(budgetPool.allocated_amount ?? 0);
          const usedAmount = Number(budgetPool.used_amount ?? 0);
          const currentAmount = Number(reimbursement.total_amount ?? 0);
          const nextUsed = usedAmount + currentAmount;
          const usagePercent = allocatedAmount > 0 ? (nextUsed / allocatedAmount) * 100 : 0;
          const controlMode = normalizeBudgetControlMode(fastify.config);

          budgetCheck = {
            budgetId: budgetPool.id,
            budgetCode: budgetPool.code,
            controlMode,
            usagePercent: Number(usagePercent.toFixed(2)),
            exceededThreshold: usagePercent >= budgetPool.warning_threshold_percent,
            exceededBudget: nextUsed > allocatedAmount,
          };

          if (usagePercent >= budgetPool.warning_threshold_percent) {
            await tx.auditLog.create({
              data: buildAuditLogData(request, {
                actorId: request.employee.id,
                action: "BUDGET_THRESHOLD_HIT",
                targetType: "budget_pool",
                targetId: budgetPool.id,
                extra: {
                  reimbursementId,
                  formNumber: reimbursement.form_number ?? null,
                  usagePercent: Number(usagePercent.toFixed(2)),
                  threshold: budgetPool.warning_threshold_percent,
                  controlMode,
                },
              }),
            });
          }

          if (controlMode === "block" && nextUsed > allocatedAmount) {
            throw new AppError({
              code: "VALID_001",
              message: "参数校验失败",
              statusCode: 409,
              details: { budget: "exceeded_block_mode" },
            });
          }

          await tx.budgetLedgerEntry.create({
            data: {
              budget_pool_id: budgetPool.id,
              reimbursement_id: reimbursementId,
              kind: controlMode === "block" && nextUsed > allocatedAmount ? "blocked" : "submit",
              amount: reimbursement.total_amount,
              note: `submit:${reimbursement.form_number ?? reimbursementId}`,
              created_by: request.employee.id,
            },
          });

          await tx.budgetPool.update({
            where: { id: budgetPool.id },
            data: {
              used_amount: nextUsed.toFixed(2),
              updated_by: request.employee.id,
            },
          });
        }

        const workflowDefinition = await tx.workflowDefinition.findFirst({
          where: {
            entity_type: "reimbursement",
            is_active: true,
          },
          orderBy: { version: "desc" },
          select: {
            id: true,
          },
        });
        if (!workflowDefinition) {
          throw new AppError({
            code: "VALID_001",
            message: "参数校验失败",
            statusCode: 400,
            details: { workflow: "missing_definition" },
          });
        }

        const approvalRule = await loadApprovalRuleForAmount(tx, reimbursement.total_amount);
        const workflowSteps = buildWorkflowStepsFromApprovalRule(approvalRule);
        const { actionable, skipped } = await resolveActionableStep({
          tx,
          steps: workflowSteps,
          startIndex: 0,
          ownerId: reimbursement.owner_id,
          logger: fastify.log,
        });

        if (!actionable) {
          throw new AppError({
            code: "VALID_001",
            message: "参数校验失败",
            statusCode: 409,
            details: {
              workflow: "no_actionable_approver",
            },
          });
        }

        let formNumber = reimbursement.form_number;
        if (!formNumber) {
          const issued = await issueDocumentNumber(tx, {
            documentType: "reimbursement",
            actorId: request.employee.id,
            timeZone: fastify.config.appTimezone,
          });

          formNumber = issued.documentNumber;
        }

        await tx.reimbursementForm.update({
          where: { id: reimbursementId },
          data: {
            form_number: formNumber,
            status: "reviewing",
            updated_by: request.employee.id,
          },
        });

        const workflowInstance = await tx.workflowInstance.create({
          data: {
            workflow_id: workflowDefinition.id,
            entity_type: "reimbursement",
            entity_id: reimbursementId,
            reimbursement_id: reimbursementId,
            submitter_id: request.employee.id,
            current_status: "pending",
            current_step_id: actionable.step.id,
            context_data: {
              owner_id: reimbursement.owner_id,
              department_id: reimbursement.department_id,
              workflow_steps_snapshot: workflowSteps,
              approval_rule_id: approvalRule.id,
            },
            context_department_id: reimbursement.department_id,
            created_by: request.employee.id,
            updated_by: request.employee.id,
          },
          select: {
            id: true,
            current_step_id: true,
          },
        });

        for (const skippedStep of skipped) {
          await tx.workflowHistory.create({
            data: {
              instance_id: workflowInstance.id,
              actor_id: request.employee.id,
              action: "skip",
              payload: {
                step_id: skippedStep.step.id,
                reason: skippedStep.reason,
                owner_id: reimbursement.owner_id,
                depth_checked: skippedStep.depthChecked,
              },
            },
          });
        }

        const workflowTask = await tx.workflowTask.create({
          data: {
            instance_id: workflowInstance.id,
            step_id: actionable.step.id,
            step_name: actionable.step.name ?? actionable.step.id,
            assignee_id: actionable.assigneeId,
            assignee_role: actionable.assigneeRole,
          },
          select: {
            id: true,
            assignee_id: true,
            assignee_role: true,
          },
        });

        await tx.workflowHistory.create({
          data: {
            instance_id: workflowInstance.id,
            task_id: workflowTask.id,
            actor_id: request.employee.id,
            action: "start",
            payload: {
              step_id: actionable.step.id,
              approval_rule_id: approvalRule.id,
              skipped_step_count: skipped.length,
            },
          },
        });

        if (reimbursement.submitter_id !== reimbursement.owner_id) {
          await tx.auditLog.create({
            data: buildAuditLogData(request, {
              actorId: request.employee.id,
              action: "REIMBURSEMENT_PROXY_SUBMITTED",
              targetType: "reimbursement_form",
              targetId: reimbursementId,
              extra: {
                ownerEmployeeId: reimbursement.owner_id,
                submitterEmployeeId: reimbursement.submitter_id,
                formNumber,
              },
            }),
          });
        }

        return {
          response: {
            reimbursementId,
            formNumber,
            workflowInstanceId: workflowInstance.id,
            currentTaskId: workflowTask.id,
            status: "reviewing",
            budget: budgetCheck,
            precheckDecision: authoritativePrecheck.decision,
            openedRiskFlagCount: openedRiskFlags.length,
          },
          sideEffectsContext: {
            reimbursementId,
            formNumber,
            workflowTaskId: workflowTask.id,
            assigneeId: workflowTask.assignee_id,
            assigneeRole: workflowTask.assignee_role,
            actorId: request.employee.id,
          },
        };
      });

      await finalizeReimbursementSubmitSideEffects({
        prisma: fastify.prisma,
        config: fastify.config,
        logger: fastify.log,
        requestId: request.id,
        ...submitResult.sideEffectsContext,
      });

      return sendData(reply, request, submitResult.response);
    },
  );

  fastify.post(
    "/reimbursements/:id/withdraw",
    {
      preHandler: fastify.requirePermission("expense.withdraw"),
    },
    async (request, reply) => {
      const reimbursementId = parseReimbursementId(request.params?.id);
      const { comment } = parseWithdrawBody(request.body);
      let response = null;

      await fastify.prisma.$transaction(async (tx) => {
        const reimbursementRows = await tx.$queryRaw`
          SELECT id, owner_id, submitter_id, status
          FROM "reimbursement_forms"
          WHERE id = ${reimbursementId}::uuid
          FOR UPDATE
        `;

        if (!Array.isArray(reimbursementRows) || reimbursementRows.length === 0) {
          throw new AppError({
            code: "SYS_404",
            message: "Not Found",
            statusCode: 404,
          });
        }

        const reimbursement = reimbursementRows[0];
        const isApplicant =
          reimbursement.owner_id === request.employee.id ||
          reimbursement.submitter_id === request.employee.id;
        if (!isApplicant) {
          throw new AppError({
            code: "PERM_001",
            message: "无权限",
            statusCode: 403,
            details: { withdraw: "only_owner_or_submitter" },
          });
        }

        if (reimbursement.status !== "reviewing") {
          throw new AppError({
            code: "VALID_001",
            message: "参数校验失败",
            statusCode: 409,
            details: { status: "invalid_withdraw_status" },
          });
        }

        const activeInstance = await tx.workflowInstance.findFirst({
          where: {
            entity_type: "reimbursement",
            entity_id: reimbursementId,
            current_status: "pending",
          },
          orderBy: { created_at: "desc" },
          select: { id: true },
        });

        if (!activeInstance) {
          throw new AppError({
            code: "VALID_001",
            message: "参数校验失败",
            statusCode: 409,
            details: { withdraw: "no_pending_instance" },
          });
        }

        const processedTaskCount = await tx.workflowTask.count({
          where: {
            instance_id: activeInstance.id,
            status: { in: ["completed", "rejected"] },
          },
        });
        if (processedTaskCount > 0) {
          throw new AppError({
            code: "VALID_001",
            message: "参数校验失败",
            statusCode: 409,
            details: { withdraw: "already_processed_by_approver" },
          });
        }

        const now = new Date();
        await tx.workflowTask.updateMany({
          where: {
            instance_id: activeInstance.id,
            status: "pending",
          },
          data: {
            status: "cancelled",
            completed_at: now,
            completed_by: request.employee.id,
          },
        });

        await tx.workflowInstance.update({
          where: { id: activeInstance.id },
          data: {
            current_status: "cancelled",
            completed_at: now,
            updated_by: request.employee.id,
          },
        });

        await tx.reimbursementForm.update({
          where: { id: reimbursementId },
          data: {
            status: "draft",
            updated_by: request.employee.id,
          },
        });

        await tx.workflowHistory.create({
          data: {
            instance_id: activeInstance.id,
            actor_id: request.employee.id,
            action: "withdraw",
            comment: comment ?? null,
            payload: {
              reimbursement_id: reimbursementId,
            },
          },
        });

        response = {
          reimbursementId,
          outcome: "withdrawn",
          workflowInstanceId: activeInstance.id,
          reimbursementStatus: "draft",
        };
      });

      return sendData(reply, request, response);
    },
  );

  fastify.post(
    "/reimbursements/:id/link-project",
    {
      preHandler: fastify.authenticate,
    },
    async (request, reply) => {
      const gate = await evaluateFeatureFlag({
        prisma: fastify.prisma,
        config: fastify.config,
        flagKey: FEATURE_FLAG_KEYS.projectLinking,
        departmentId: request.employee.department_id ?? null,
        strictDepartment: false,
      });
      if (!gate.enabled) {
        throw new AppError({ code: "VALID_001", message: "参数校验失败", statusCode: 409, details: { featureFlag: "project_linking_v1_disabled", reason: gate.reason } });
      }
      const reimbursementId = parseReimbursementId(request.params?.id);
      const body = parseBody(z.object({ projectId: z.string().uuid().nullable() }).strict(), request.body);
      const current = await fastify.prisma.reimbursementForm.findUnique({
        where: { id: reimbursementId },
        select: { id: true, owner_id: true, submitter_id: true, project_id: true, status: true },
      });
      if (!current) {
        throw new AppError({ code: "SYS_404", message: "Not Found", statusCode: 404 });
      }
      ensureOwnOrCanViewAll(fastify, request, current);
      const updated = await fastify.prisma.reimbursementForm.update({
        where: { id: reimbursementId },
        data: { project_id: body.projectId ?? null, updated_by: request.employee.id },
        select: { id: true, project_id: true, project: { select: { id: true, project_no: true, name: true } } },
      });
      return sendData(reply, request, {
        item: {
          reimbursementId: updated.id,
          projectId: updated.project_id ?? null,
          project: updated.project ? { id: updated.project.id, projectNo: updated.project.project_no, name: updated.project.name } : null,
        },
      });
    },
  );

  fastify.post(
    "/reimbursements/:id/pay",
    {
      preHandler: fastify.requirePermission("expense.finance.pay"),
    },
    async (request, reply) => {
      const reimbursementId = parseReimbursementId(request.params?.id);
      const payInput = parsePayBody(request.body);
      let response = null;
      const emailTasks = [];

      await fastify.prisma.$transaction(async (tx) => {
        const reimbursementRows = await tx.$queryRaw`
          SELECT id, status, form_number, owner_id, submitter_id, department_id,
                 payment_voucher_no, payment_date, payment_channel, paid_at, paid_by
          FROM "reimbursement_forms"
          WHERE id = ${reimbursementId}::uuid
          FOR UPDATE
        `;

        if (!Array.isArray(reimbursementRows) || reimbursementRows.length === 0) {
          throw new AppError({
            code: "SYS_404",
            message: "Not Found",
            statusCode: 404,
          });
        }

        const reimbursement = reimbursementRows[0];
        await ensureCutoverAllowed({
          prisma: tx,
          config: fastify.config,
          request,
          domain: "expense",
          departmentId: reimbursement.department_id ?? request.employee.department_id ?? null,
        });
        if (!["approved", "paid"].includes(reimbursement.status)) {
          throw new AppError({
            code: "VALID_001",
            message: "参数校验失败",
            statusCode: 409,
            details: { status: "invalid_pay_status" },
          });
        }

        const existingPaymentDate = toDateOnlyString(reimbursement.payment_date);
        if (reimbursement.status === "paid") {
          const hasVoucherConflict =
            payInput.paymentVoucherNo != null &&
            payInput.paymentVoucherNo !== (reimbursement.payment_voucher_no ?? null);
          const hasPaymentDateConflict =
            payInput.paymentDate != null && payInput.paymentDate !== existingPaymentDate;
          const hasChannelConflict =
            payInput.paymentChannel != null &&
            payInput.paymentChannel !== (reimbursement.payment_channel ?? null);

          if (hasVoucherConflict || hasPaymentDateConflict || hasChannelConflict) {
            throw new AppError({
              code: "VALID_001",
              message: "参数校验失败",
              statusCode: 409,
              details: { payment: "already_paid_conflict" },
            });
          }
        }

        const now = new Date();
        const archivedResult = await tx.invoicePool.updateMany({
          where: {
            linked_reimbursement_id: reimbursementId,
            status: "bound",
          },
          data: {
            status: "archived",
            archived_reason: "used_complete",
            archived_at: now,
            updated_by: request.employee.id,
          },
        });

        if (reimbursement.status === "approved") {
          await tx.reimbursementForm.update({
            where: { id: reimbursementId },
            data: {
              status: "paid",
              payment_voucher_no: payInput.paymentVoucherNo ?? null,
              payment_date: payInput.paymentDate ? parseDateOnlyString(payInput.paymentDate) : null,
              payment_channel: payInput.paymentChannel ?? null,
              paid_at: now,
              paid_by: request.employee.id,
              updated_by: request.employee.id,
            },
          });

          const refreshed = await tx.reimbursementForm.findUnique({
            where: { id: reimbursementId },
            select: {
              id: true,
              form_number: true,
              owner_id: true,
              submitter_id: true,
              department_id: true,
              total_amount: true,
              payment_voucher_no: true,
              payment_date: true,
              paid_at: true,
              owner: {
                select: {
                  legal_entity: {
                    select: {
                      code: true,
                    },
                  },
                },
              },
              submitter: {
                select: {
                  legal_entity: {
                    select: {
                      code: true,
                    },
                  },
                },
              },
            },
          });

          if (refreshed) {
            const departmentId =
              refreshed.department_id ?? reimbursement.department_id ?? request.employee.department_id ?? null;
            const erpGate = await evaluateFeatureFlag({
              prisma: tx,
              config: fastify.config,
              flagKey: FEATURE_FLAG_KEYS.erpSync,
              departmentId,
              strictDepartment: true,
            });

            if (erpGate.enabled) {
              await enqueueReimbursementJournalExport(tx, fastify.config, {
                reimbursement: refreshed,
                actorId: request.employee.id,
              });
            } else {
              await tx.auditLog.create({
                data: buildAuditLogData(request, {
                  actorId: request.employee.id,
                  action: "ERP_SYNC_SKIPPED_BY_FEATURE_FLAG",
                  targetType: "reimbursement_form",
                  targetId: refreshed.id,
                  extra: {
                    featureFlag: FEATURE_FLAG_KEYS.erpSync,
                    departmentId,
                    reason: erpGate.reason,
                  },
                }),
              });
            }
          }

          try {
            const recipients = Array.from(
              new Set([reimbursement.owner_id, reimbursement.submitter_id].filter(Boolean)),
            );
            await createNotifications(tx, {
              recipientEmployeeIds: recipients,
              type: NOTIFICATION_TYPES.reimbursementPaid,
              title: `【已付款】报销单 ${reimbursement.form_number ?? reimbursementId}`,
              body: `报销单 ${reimbursement.form_number ?? reimbursementId} 已完成付款。`,
              targetType: "reimbursement_form",
              targetId: reimbursementId,
            });

            await enqueueImNotifications(tx, {
              config: fastify.config,
              logger: fastify.log,
              recipientEmployeeIds: recipients,
              type: NOTIFICATION_TYPES.reimbursementPaid,
              title: `【已付款】报销单 ${reimbursement.form_number ?? reimbursementId}`,
              body: `报销单 ${reimbursement.form_number ?? reimbursementId} 已完成付款。`,
              targetType: "reimbursement_form",
              targetId: reimbursementId,
              targetPath: `/reimbursements/${reimbursementId}`,
              entityType: "reimbursement",
              entityId: reimbursementId,
              actorId: request.employee.id,
            });

            emailTasks.push({
              type: NOTIFICATION_TYPES.reimbursementPaid,
              recipientEmployeeIds: recipients,
              subject: `【已付款】报销单 ${reimbursement.form_number ?? reimbursementId}`,
              body: `报销单 ${reimbursement.form_number ?? reimbursementId} 已完成付款。`,
              targetPath: `/reimbursements/${reimbursementId}`,
            });
          } catch (error) {
            fastify.log.error(
              { err: error, reimbursementId },
              "Failed to create reimbursement paid notifications",
            );
          }
        }

        response = {
          reimbursementId,
          outcome: "paid",
          reimbursementStatus: "paid",
          // archivedInvoiceCount=0 is valid for idempotent pay or when no bound invoices remain.
          archivedInvoiceCount: archivedResult.count,
          payment: {
            paymentVoucherNo:
              reimbursement.status === "paid"
                ? reimbursement.payment_voucher_no ?? null
                : payInput.paymentVoucherNo ?? null,
            paymentDate:
              reimbursement.status === "paid"
                ? existingPaymentDate
                : payInput.paymentDate ?? null,
            paymentChannel:
              reimbursement.status === "paid"
                ? reimbursement.payment_channel ?? null
                : payInput.paymentChannel ?? null,
            paidAt:
              reimbursement.status === "paid"
                ? reimbursement.paid_at?.toISOString?.() ?? null
                : now.toISOString(),
            paidBy:
              reimbursement.status === "paid"
                ? reimbursement.paid_by ?? null
                : request.employee.id,
            idempotent: reimbursement.status === "paid",
          },
        };
      });

      for (const task of emailTasks) {
        void sendNotificationEmailSafe({
          prisma: fastify.prisma,
          config: fastify.config,
          logger: fastify.log,
          requestId: request.id,
          ...task,
        });
      }

      return sendData(reply, request, response);
    },
  );
}

module.exports = reimbursementRoutes;

module.exports.__testables = {
  finalizeReimbursementSubmitSideEffects,
};