"use client";

/**
 * Universal domain API
 *
 * 涵盖 7 个 universal widget 的查询函数：
 * - useGrades / useHomework / useSchedule / useAttendance / useExams
 * - useNotifications / useAnnouncements
 *
 * widget 通过 `import { useGrades } from "@/lib/api"` 调用，
 * 不再各自内嵌 gql/接口/手写类型。
 *
 * universal domain 全部为查询，无 mutation。
 *
 * 关联：spec §2.2、§5.6 统一 Hook、M8 验收
 */
import type { FetchPolicy } from "@apollo/client";
import {
  GET_GRADES_DOC,
  GET_HOMEWORKS_DOC,
  GET_SCHEDULE_DOC,
  GET_ATTENDANCE_DOC,
  GET_EXAMS_DOC,
  GET_NOTIFICATIONS_LIST_DOC,
  GET_ANNOUNCEMENTS_DOC,
} from "@/lib/api/operations/universal.graphql";
import { useWidgetQuery } from "@/lib/useWidgetQuery";
import type { Pagination, UseQueryResult } from "./types";

// ===== 领域模型类型 =====

export interface Grade {
  studentId: string;
  score: number;
}

export interface Homework {
  id: string;
  title: string;
  dueDate: string;
  status: string;
}

export interface ScheduleItem {
  id: string;
  subject: string;
  startTime: string;
  endTime: string;
  teacherName: string;
}

export interface AttendanceStats {
  present: number;
  absent: number;
  late: number;
  total: number;
}

export interface Exam {
  id: string;
  name: string;
  examDate: string;
  subject: string;
  maxScore: number;
}

export interface Notification {
  id: string;
  title: string;
  body: string;
  createdAt: string;
  type: string;
}

export interface NotificationList {
  items: Notification[];
  total: number;
}

export interface Announcement {
  id: string;
  title: string;
  body: string;
  author: string;
  publishedAt: string;
}

// ===== 查询选项（透传 useWidgetQuery，但 fallbackData 由本层处理） =====

export interface UniversalQueryOptions {
  /** 是否启用查询（false 时跳过） */
  enabled?: boolean;
  /** 轮询间隔（ms） */
  pollInterval?: number;
  /** Apollo fetchPolicy */
  fetchPolicy?: FetchPolicy;
}

// ===== 内部 Query 类型（codegen skipDocumentsValidation，用 inline 类型） =====
// 注意：Vars 使用 type alias 而非 interface，以满足 useWidgetQuery 的
// `TVars extends Record<string, unknown>` 约束（known-issues §2.17 TS2344）。

interface GradesQueryData {
  grades: Grade[];
}
type GradesQueryVars = {
  classId: string;
};

interface HomeworksQueryData {
  homeworks: Homework[];
}
type HomeworksQueryVars = {
  classId: string;
  limit: number;
};

interface ScheduleQueryData {
  schedule: ScheduleItem[];
}
type ScheduleQueryVars = {
  classId: string;
  dayOfWeek: number;
};

interface AttendanceQueryData {
  attendance: AttendanceStats;
}
type AttendanceQueryVars = {
  classId: string;
  termId: string;
};

interface ExamsQueryData {
  exams: Exam[];
}
type ExamsQueryVars = {
  classId: string;
  limit: number;
};

interface NotificationsListQueryData {
  notifications: NotificationList;
}
type NotificationsListQueryVars = {
  limit: number;
  offset: number;
};

interface AnnouncementsQueryData {
  announcements: Announcement[];
}
type AnnouncementsQueryVars = {
  limit: number;
};

// ===== Hooks =====

/**
 * 查询班级成绩列表。
 *
 * 关联：portal-shell spec §5.6 统一 Hook、M8 验收
 */
export function useGrades(
  classId: string,
  options?: UniversalQueryOptions,
): UseQueryResult<Grade[]> {
  const result = useWidgetQuery<GradesQueryData, GradesQueryVars>(
    GET_GRADES_DOC,
    { classId },
    options,
  );

  return {
    data: result.data?.grades,
    loading: result.loading,
    error: result.error,
    refetch: result.refetch,
  };
}

/**
 * 查询班级作业列表，可指定返回条数。
 *
 * 关联：portal-shell spec §5.6 统一 Hook、M8 验收
 */
export function useHomework(
  classId: string,
  limit: number,
  options?: UniversalQueryOptions,
): UseQueryResult<Homework[]> {
  const result = useWidgetQuery<HomeworksQueryData, HomeworksQueryVars>(
    GET_HOMEWORKS_DOC,
    { classId, limit },
    options,
  );

  return {
    data: result.data?.homeworks,
    loading: result.loading,
    error: result.error,
    refetch: result.refetch,
  };
}

/**
 * 查询班级当日课表（按星期几过滤）。
 *
 * 关联：portal-shell spec §5.6 统一 Hook、M8 验收
 */
export function useSchedule(
  classId: string,
  dayOfWeek: number,
  options?: UniversalQueryOptions,
): UseQueryResult<ScheduleItem[]> {
  const result = useWidgetQuery<ScheduleQueryData, ScheduleQueryVars>(
    GET_SCHEDULE_DOC,
    { classId, dayOfWeek },
    options,
  );

  return {
    data: result.data?.schedule,
    loading: result.loading,
    error: result.error,
    refetch: result.refetch,
  };
}

/**
 * 查询班级学期考勤统计。
 *
 * 关联：portal-shell spec §5.6 统一 Hook、M8 验收
 */
export function useAttendance(
  classId: string,
  termId: string,
  options?: UniversalQueryOptions,
): UseQueryResult<AttendanceStats> {
  const result = useWidgetQuery<AttendanceQueryData, AttendanceQueryVars>(
    GET_ATTENDANCE_DOC,
    { classId, termId },
    options,
  );

  return {
    data: result.data?.attendance,
    loading: result.loading,
    error: result.error,
    refetch: result.refetch,
  };
}

/**
 * 查询班级考试列表，可指定返回条数。
 *
 * 关联：portal-shell spec §5.6 统一 Hook、M8 验收
 */
export function useExams(
  classId: string,
  limit: number,
  options?: UniversalQueryOptions,
): UseQueryResult<Exam[]> {
  const result = useWidgetQuery<ExamsQueryData, ExamsQueryVars>(
    GET_EXAMS_DOC,
    { classId, limit },
    options,
  );

  return {
    data: result.data?.exams,
    loading: result.loading,
    error: result.error,
    refetch: result.refetch,
  };
}

/**
 * 查询通知列表（分页），返回 items + total。
 *
 * 关联：portal-shell spec §5.6 统一 Hook、M8 验收
 */
export function useNotifications(
  pagination: Pagination,
): UseQueryResult<NotificationList> {
  const result = useWidgetQuery<
    NotificationsListQueryData,
    NotificationsListQueryVars
  >(GET_NOTIFICATIONS_LIST_DOC, {
    limit: pagination.limit,
    offset: pagination.offset,
  });

  return {
    data: result.data?.notifications,
    loading: result.loading,
    error: result.error,
    refetch: result.refetch,
  };
}

/**
 * 查询公告列表，可指定返回条数。
 *
 * 关联：portal-shell spec §5.6 统一 Hook、M8 验收
 */
export function useAnnouncements(
  limit: number,
): UseQueryResult<Announcement[]> {
  const result = useWidgetQuery<AnnouncementsQueryData, AnnouncementsQueryVars>(
    GET_ANNOUNCEMENTS_DOC,
    { limit },
  );

  return {
    data: result.data?.announcements,
    loading: result.loading,
    error: result.error,
    refetch: result.refetch,
  };
}