R44 A2-A8 完成员工高级筛选批量操作与统计页

server/src/services/employeeStats.js

@@ -0,0 +1,96 @@
+const { currentDateString, parseDateOnlyString } = require("../utils/date");
+
+function addDays(date, days) {
+  const next = new Date(date);
+  next.setUTCDate(next.getUTCDate() + days);
+  return next;
+}
+
+async function buildEmployeeStats(prisma, options = {}) {
+  const timeZone = options.timeZone ?? "Asia/Shanghai";
+  const todayString = currentDateString(timeZone);
+  const today = parseDateOnlyString(todayString);
+  const last30DateFrom = addDays(today, -29);
+  const next30DateTo = addDays(today, 30);
+  const activeEmployeeWhere = { status: "active" };
+
+  const [employmentStatusRows, departmentRows, departments, recentHires, recentDepartures, expiringContracts] = await Promise.all([
+    prisma.employee.groupBy({
+      by: ["employment_status"],
+      where: activeEmployeeWhere,
+      _count: { _all: true },
+    }),
+    prisma.employee.groupBy({
+      by: ["department_id"],
+      where: activeEmployeeWhere,
+      _count: { _all: true },
+    }),
+    prisma.department.findMany({
+      where: { archived_at: null },
+      select: { id: true, name: true },
+    }),
+    prisma.employee.count({
+      where: {
+        hire_date: {
+          gte: last30DateFrom,
+          lte: new Date(`${todayString}T23:59:59.999Z`),
+        },
+      },
+    }),
+    prisma.employee.count({
+      where: {
+        last_working_date: {
+          gte: last30DateFrom,
+          lte: new Date(`${todayString}T23:59:59.999Z`),
+        },
+      },
+    }),
+    prisma.employeeContract.count({
+      where: {
+        terminated_date: null,
+        end_date: {
+          gte: today,
+          lte: new Date(`${next30DateTo.toISOString().slice(0, 10)}T23:59:59.999Z`),
+        },
+        employee: activeEmployeeWhere,
+      },
+    }),
+  ]);
+
+  const departmentMap = new Map(departments.map((item) => [item.id, item.name]));
+
+  return {
+    asOfDate: todayString,
+    employmentStatusSummary: {
+      total: employmentStatusRows.reduce((sum, item) => sum + item._count._all, 0),
+      items: employmentStatusRows
+        .map((item) => ({
+          status: item.employment_status,
+          count: item._count._all,
+        }))
+        .sort((left, right) => right.count - left.count || left.status.localeCompare(right.status)),
+    },
+    departmentHeadcount: departmentRows
+      .map((item) => ({
+        departmentId: item.department_id,
+        departmentName: departmentMap.get(item.department_id) ?? "未知部门",
+        count: item._count._all,
+      }))
+      .sort((left, right) => right.count - left.count || left.departmentName.localeCompare(right.departmentName)),
+    recentMovements: {
+      dateFrom: last30DateFrom.toISOString().slice(0, 10),
+      dateTo: todayString,
+      hires: recentHires,
+      departures: recentDepartures,
+    },
+    expiringContracts: {
+      dateFrom: todayString,
+      dateTo: next30DateTo.toISOString().slice(0, 10),
+      count: expiringContracts,
+    },
+  };
+}
+
+module.exports = {
+  buildEmployeeStats,
+};