/**
 * 文件管理 Hooks
 *
 * contract §2.4：adminFiles / adminFileStats / deleteFiles
 */
import { useCallback, useState } from "react";
import { useGraphMutation, useGraphQuery } from "./use-graphql";
import {
  ADMIN_FILES_QUERY,
  ADMIN_FILE_STATS_QUERY,
  DELETE_FILES_MUTATION,
} from "@/lib/graphql-client";
import type {
  FileViewModel,
  FileStats,
  PaginatedResult,
} from "@/types/view-models";

/** 文件列表筛选参数 */
export interface FileFilter {
  page?: number;
  pageSize?: number;
  search?: string;
  mimeType?: string;
  entityType?: string;
}

interface AdminFilesResponse {
  adminFiles: PaginatedResult<FileViewModel>;
}

interface AdminFileStatsResponse {
  adminFileStats: FileStats;
}

interface DeleteFilesResponse {
  deleteFiles: boolean;
}

export function useFiles(filter: FileFilter) {
  const result = useGraphQuery<AdminFilesResponse>(ADMIN_FILES_QUERY, {
    filter,
  });
  return {
    ...result,
    data: result.data?.adminFiles ?? null,
  };
}

export function useFileStats() {
  const result = useGraphQuery<AdminFileStatsResponse>(ADMIN_FILE_STATS_QUERY);
  return {
    ...result,
    data: result.data?.adminFileStats ?? null,
  };
}

export function useDeleteFiles() {
  const [run, state] = useGraphMutation<DeleteFilesResponse, { ids: string[] }>(
    DELETE_FILES_MUTATION,
  );
  const deleteFiles = useCallback(
    async (ids: string[]) => {
      const res = await run({ ids });
      return res.data?.deleteFiles ?? false;
    },
    [run],
  );
  return [deleteFiles, state] as const;
}

/** 文件筛选状态管理 */
export function useFileFilter(initial?: FileFilter) {
  const [filter, setFilter] = useState<FileFilter>({
    page: 1,
    pageSize: 20,
    ...initial,
  });
  const setPage = useCallback(
    (page: number) => setFilter((f) => ({ ...f, page })),
    [],
  );
  const setSearch = useCallback(
    (search: string) => setFilter((f) => ({ ...f, search, page: 1 })),
    [],
  );
  const setMimeType = useCallback(
    (mimeType: string) =>
      setFilter((f) => ({ ...f, mimeType: mimeType || undefined, page: 1 })),
    [],
  );
  const setEntityType = useCallback(
    (entityType: string) =>
      setFilter((f) => ({
        ...f,
        entityType: entityType || undefined,
        page: 1,
      })),
    [],
  );
  return { filter, setFilter, setPage, setSearch, setMimeType, setEntityType };
}