"use client";

/**
 * 考勤管理页 - 客户端组件（ARCHITECTURE.md §7.3 列表页 / §9.4 / §10 P5 / admin-NeedTodo §四）
 *
 * 数据契约：
 * - adminAttendanceStats()：❌ schema 无 → MSW 兜底（@contract-pending）
 * - attendanceGradeCorrelation()：❌ schema 无 → MSW 兜底
 * - adminClasses()：❌ schema 无 → MSW 兜底（用于班级筛选下拉）
 * - grades()：✅ 真实 schema（用于年级筛选下拉）
 * - classComparison()：❌ schema 无 → MSW 兜底（由 ClassComparisonCard 内部调用）
 *
 * URL 状态：?classId=xxx&status=xxx&date=xxx&gradeId=xxx&page=xxx
 *
 * 三态规范（§11.3 DoD）：loading（骨架）/ error（局部降级）/ empty（EmptyState）
 *
 * 关联：ARCHITECTURE.md §5.3 / §5.4 / §7.3 / §9.4 / §10 P5 / §11.3 / §11.4
 */
import { CalendarCheck } from "lucide-react";
import { useRouter, useSearchParams } from "next/navigation";
import { useMemo, useTransition } from "react";
import { useTranslations } from "next-intl";

import {
  useAdminAttendanceStats,
  useAdminClasses,
  useAttendanceGradeCorrelation,
  useGrades,
} from "@/lib/api";
import { EmptyState } from "@/shared/components/ui/empty-state";
import { StatCard } from "@/shared/components/ui/stat-card";
import {
  ListPageShell,
  ListPageSkeleton,
} from "@/shared/components/page-templates";
import {
  computeAbnormalRate,
  computeAvgCorrelation,
  formatAbnormalRate,
  formatCorrelation,
  formatRate,
  formatRecordDate,
  hasAttendanceData,
  presentRateToColorClass,
  truncateNote,
  type AttendanceStatus,
} from "@/features/admin/attendance/transformations";
import { ClassComparisonCard } from "@/features/admin/attendance/class-comparison-card";
import { AttendanceGradeCorrelationCard } from "@/features/admin/attendance/attendance-grade-correlation-card";
import { AttendanceRecordsList } from "@/features/admin/attendance/attendance-records-list";

/** 考勤状态选项（用于筛选下拉） */
const STATUS_OPTIONS: readonly AttendanceStatus[] = [
  "present",
  "absent",
  "late",
  "leave",
] as const;

/**
 * 考勤管理客户端主体。需由 server page 包裹在 <Suspense> 中
 * （useSearchParams 要求 Suspense 边界，Next.js 15 强制）。
 */
export function AdminAttendanceClient(): React.ReactElement {
  const t = useTranslations("admin.attendance.list");
  const tCommon = useTranslations("common");
  const router = useRouter();
  const searchParams = useSearchParams();
  const [, startTransition] = useTransition();

  const classId = searchParams.get("classId") ?? "";
  const status = searchParams.get("status") ?? "";
  const date = searchParams.get("date") ?? "";
  const gradeId = searchParams.get("gradeId") ?? "";

  // @contract-pending：MSW 兜底
  const { data: stats, loading, error } = useAdminAttendanceStats();
  const { data: correlations } = useAttendanceGradeCorrelation();
  const { data: classes } = useAdminClasses();
  const { data: grades } = useGrades();

  const avgCorrelation = useMemo(
    () => computeAvgCorrelation(correlations ?? []),
    [correlations],
  );

  const updateFilter = (key: string, next: string): void => {
    const params = new URLSearchParams(searchParams.toString());
    if (next) {
      params.set(key, next);
    } else {
      params.delete(key);
    }
    // 切换筛选时重置页码
    if (key !== "page") {
      params.delete("page");
    }
    startTransition(() => {
      router.push(`/shell/admin/attendance?${params.toString()}`);
    });
  };

  const hasData = hasAttendanceData(stats);

  const errorNode = error ? (
    <div className="rounded-xl border border-destructive/30 bg-destructive/5 p-6 text-center">
      <p className="text-sm text-destructive">
        {tCommon("error.loadFailed", { message: String(error) })}
      </p>
      <p className="mt-2 text-xs text-muted-foreground">{t("mswNotice")}</p>
    </div>
  ) : undefined;

  const emptyNode = (
    <EmptyState
      icon={CalendarCheck}
      title={t("emptyTitle")}
      description={t("emptyDescription")}
    />
  );

  return (
    <ListPageShell
      title={t("title")}
      description={t("description")}
      icon={<CalendarCheck className="size-6" />}
      filters={
        <AttendanceFilters
          classId={classId}
          status={status}
          date={date}
          gradeId={gradeId}
          classes={classes ?? []}
          grades={grades ?? []}
          onClassChange={(v) => updateFilter("classId", v)}
          onStatusChange={(v) => updateFilter("status", v)}
          onDateChange={(v) => updateFilter("date", v)}
          onGradeChange={(v) => updateFilter("gradeId", v)}
        />
      }
      loading={loading}
      loadingNode={<ListPageSkeleton rows={5} />}
      empty={!hasData && !loading}
      emptyNode={emptyNode}
      errorNode={errorNode}
    >
      {stats ? (
        <AttendanceContent stats={stats} avgCorrelation={avgCorrelation} />
      ) : null}
      {/* 班级对比卡 + 考勤-成绩关联分析卡（并排布局，lg 以上双列） */}
      <div className="grid grid-cols-1 gap-4 lg:grid-cols-2">
        <ClassComparisonCard />
        <AttendanceGradeCorrelationCard />
      </div>

      {/* 考勤记录列表：按 classId/status/date/gradeId 筛选 + URL 分页 */}
      <AttendanceRecordsList
        classId={classId}
        status={status}
        date={date}
        gradeId={gradeId}
      />

      <p className="text-xs text-muted-foreground">{t("mswNotice")}</p>
    </ListPageShell>
  );
}

/**
 * 考勤筛选栏（年级 + 班级 + 状态 + 日期）。
 */
function AttendanceFilters({
  classId,
  status,
  date,
  gradeId,
  classes,
  grades,
  onClassChange,
  onStatusChange,
  onDateChange,
  onGradeChange,
}: {
  classId: string;
  status: string;
  date: string;
  gradeId: string;
  classes: NonNullable<ReturnType<typeof useAdminClasses>["data"]>;
  grades: NonNullable<ReturnType<typeof useGrades>["data"]>;
  onClassChange: (v: string) => void;
  onStatusChange: (v: string) => void;
  onDateChange: (v: string) => void;
  onGradeChange: (v: string) => void;
}): React.ReactElement {
  const t = useTranslations("admin.attendance.list");
  return (
    <div className="flex flex-wrap items-center gap-3">
      <div className="flex flex-col gap-1">
        <label className="text-xs text-muted-foreground">
          {t("gradeFilter")}
        </label>
        <select
          value={gradeId}
          onChange={(e) => onGradeChange(e.target.value)}
          className="h-9 rounded-md border border-input bg-transparent px-3 text-sm shadow-xs outline-none focus-visible:border-ring focus-visible:ring-ring/50 focus-visible:ring-[3px]"
        >
          <option value="">{t("allGrades")}</option>
          {grades.map((g) => (
            <option key={g.id} value={g.id}>
              {g.name}
            </option>
          ))}
        </select>
      </div>

      <div className="flex flex-col gap-1">
        <label className="text-xs text-muted-foreground">
          {t("classFilter")}
        </label>
        <select
          value={classId}
          onChange={(e) => onClassChange(e.target.value)}
          className="h-9 rounded-md border border-input bg-transparent px-3 text-sm shadow-xs outline-none focus-visible:border-ring focus-visible:ring-ring/50 focus-visible:ring-[3px]"
        >
          <option value="">{t("allClasses")}</option>
          {classes.map((cls) => (
            <option key={cls.id} value={cls.id}>
              {cls.name}
            </option>
          ))}
        </select>
      </div>

      <div className="flex flex-col gap-1">
        <label className="text-xs text-muted-foreground">
          {t("statusFilter")}
        </label>
        <select
          value={status}
          onChange={(e) => onStatusChange(e.target.value)}
          className="h-9 rounded-md border border-input bg-transparent px-3 text-sm shadow-xs outline-none focus-visible:border-ring focus-visible:ring-ring/50 focus-visible:ring-[3px]"
        >
          <option value="">{t("allStatuses")}</option>
          {STATUS_OPTIONS.map((s) => (
            <option key={s} value={s}>
              {t(
                `status${s.charAt(0).toUpperCase()}${s.slice(1)}` as
                  | "statusPresent"
                  | "statusAbsent"
                  | "statusLate"
                  | "statusLeave",
              )}
            </option>
          ))}
        </select>
      </div>

      <div className="flex flex-col gap-1">
        <label className="text-xs text-muted-foreground">
          {t("dateFilter")}
        </label>
        <input
          type="date"
          value={date}
          onChange={(e) => onDateChange(e.target.value)}
          className="h-9 rounded-md border border-input bg-transparent px-3 text-sm shadow-xs outline-none focus-visible:border-ring focus-visible:ring-ring/50 focus-visible:ring-[3px]"
        />
      </div>
    </div>
  );
}

/**
 * 考勤主体内容（统计卡片）。
 * 班级对比与考勤-成绩关联分析由独立卡片组件渲染（ClassComparisonCard /
 * AttendanceGradeCorrelationCard），各自管理数据获取与三态。
 */
function AttendanceContent({
  stats,
  avgCorrelation,
}: {
  stats: NonNullable<ReturnType<typeof useAdminAttendanceStats>["data"]>;
  avgCorrelation: number;
}): React.ReactElement {
  const t = useTranslations("admin.attendance.list");
  const abnormalRate = computeAbnormalRate(
    stats.absentRate,
    stats.lateRate,
    stats.earlyLeaveRate,
  );

  return (
    <div className="flex flex-col gap-6">
      {/* 统计卡片 */}
      <div className="grid grid-cols-1 gap-4 md:grid-cols-2 lg:grid-cols-4">
        <StatCard title={t("statsTotalRecords")} value={stats.totalRecords} />
        <StatCard
          title={t("statsPresentRate")}
          value={formatRate(stats.presentRate)}
          valueClassName={presentRateToColorClass(stats.presentRate)}
        />
        <StatCard
          title={t("statsAbnormalRate")}
          value={formatAbnormalRate(
            stats.absentRate,
            stats.lateRate,
            stats.earlyLeaveRate,
          )}
          valueClassName={abnormalRate > 0.1 ? "text-destructive" : undefined}
        />
        <StatCard
          title={t("statsAvgCorrelation")}
          value={formatCorrelation(avgCorrelation)}
        />
      </div>

      {/* 次级统计卡片 */}
      <div className="grid grid-cols-1 gap-4 md:grid-cols-3">
        <StatCard
          title={t("statsAbsentRate")}
          value={formatRate(stats.absentRate)}
          valueClassName="text-destructive"
        />
        <StatCard
          title={t("statsLateRate")}
          value={formatRate(stats.lateRate)}
          valueClassName="text-amber-600 dark:text-amber-400"
        />
        <StatCard
          title={t("statsEarlyLeaveRate")}
          value={formatRate(stats.earlyLeaveRate)}
          valueClassName="text-sky-600 dark:text-sky-400"
        />
      </div>
    </div>
  );
}

/**
 * 备注/日期格式化辅助导出（供页面其他部分复用，对齐 DoD 纯函数）。
 */
export { formatRecordDate, truncateNote };