import { useMemo } from "react";
import { useQuery, useConvexAuth } from "convex/react";
import type { SidebarInitialData } from "@/components/sidebar/types";
import type { MediaAsset } from "@/types/media";
import { api } from "@/lib/convex/api";

/**
 * Convex 模式下的侧边栏数据 hook
 * 使用 Convex 的 useQuery 实现实时订阅，无需手动 refetch
 *
 * 注意：此 hook 仅应在 Convex 模式下使用
 * 后端从 ctx.auth.getUserIdentity() 获取用户身份，前端无需传入 userId
 */
export function useConvexSidebarData(workspaceId: string): {
  data: SidebarInitialData | null;
  isLoading: boolean;
  error: Error | null;
  refetch: () => Promise<void>;
} {
  const { isAuthenticated } = useConvexAuth();

  // 显式转为 boolean，确保类型正确
  const shouldFetch = Boolean(isAuthenticated && workspaceId);
  const currentUser = useQuery(api.users.currentUser, shouldFetch ? {} : "skip");
  const userId =
    currentUser && typeof currentUser === "object" && typeof (currentUser as any)._id === "string"
      ? String((currentUser as any)._id)
      : "";

  const shouldFetchAuthed = Boolean(shouldFetch && userId);

  // 使用 Convex 的 useQuery，自动订阅实时更新
  // 后端从 ctx.auth.getUserIdentity() 获取用户身份，无需前端传入 userId
  const documents = useQuery(
    api.documents.listByWorkspace,
    shouldFetch ? { workspaceId } : "skip"
  );

  const trashedDocuments = useQuery(
    api.documents.listTrashedByWorkspace,
    shouldFetch ? { workspaceId } : "skip"
  );

  const mindmaps = useQuery(
    api.mindmaps.listByWorkspace,
    shouldFetch ? { workspaceId, includeDeleted: true } : "skip"
  );

  const mediaAssets = useQuery(
    api.mediaAssets.listByWorkspace,
    shouldFetchAuthed ? { userId, workspaceId, limit: 200 } : "skip",
  );

  const trashedMediaAssets = useQuery(
    api.mediaAssets.listDeletedByWorkspace,
    shouldFetchAuthed ? { userId, workspaceId, limit: 2000 } : "skip",
  );

  const workspacesResult = useQuery(
    api.workspaces.fetchWorkspaceSummaries,
    shouldFetch ? undefined : "skip"
  );

  // 组合数据，格式与 SidebarInitialData 一致
  const data: SidebarInitialData | null = useMemo(() => {
    // 当 skip 时，返回值是 undefined
    if (currentUser === undefined ||
        documents === undefined ||
        trashedDocuments === undefined ||
        mindmaps === undefined ||
        mediaAssets === undefined ||
        trashedMediaAssets === undefined ||
        workspacesResult === undefined) {
      return null;
    }

    const activeMindmaps = (mindmaps ?? []).filter((r) => !r.deleted_at);
    const trashedMindmaps = (mindmaps ?? []).filter((r) => !!r.deleted_at);

    const mindmapDocs = Array.from(new Set(activeMindmaps.map((r) => r.document_id)));

    const mindmapAssets: MediaAsset[] = activeMindmaps.map((r) => {
      const isLegacy = r.mindmap_id.startsWith("legacy-");
      return {
        id: r.mindmap_id,
        workspace_id: r.workspace_id ?? workspaceId,
        document_id: r.document_id,
        asset_type: "mindmap",
        file_url: null,
        thumbnail_url: null,
        bucket: null,
        storage_path: null,
        file_name: isLegacy ? "mindmap.json" : `mindmap-${r.mindmap_id}.json`,
        file_size: null,
        mime_type: "application/json",
        ocr_payload: undefined,
        ocr_strategy: null,
        ocr_text: null,
        ocr_status: null,
        signed_url: null,
        created_at: r.created_at ?? "",
        updated_at: r.updated_at ?? "",
      };
    });

    const trashedMindmapAssets: MediaAsset[] = trashedMindmaps.map((r) => {
      const isLegacy = r.mindmap_id.startsWith("legacy-");
      return {
        id: r.mindmap_id,
        workspace_id: r.workspace_id ?? workspaceId,
        document_id: r.document_id,
        asset_type: "mindmap",
        file_url: null,
        thumbnail_url: null,
        bucket: null,
        storage_path: null,
        file_name: isLegacy ? "mindmap.json" : `mindmap-${r.mindmap_id}.json`,
        file_size: null,
        mime_type: "application/json",
        ocr_payload: undefined,
        ocr_strategy: null,
        ocr_text: null,
        ocr_status: null,
        deleted_at: r.deleted_at ?? null,
        deleted_by: r.deleted_by ?? null,
        purged_at: null,
        signed_url: null,
        created_at: r.created_at ?? "",
        updated_at: r.updated_at ?? "",
      };
    });

    return {
      activeWorkspaceId: workspacesResult.activeWorkspaceId || workspaceId,
      workspaces: workspacesResult.workspaces,
      documents,
      trashedDocuments,
      trashedMediaAssets: (trashedMediaAssets ?? []) as MediaAsset[],
      trashedMindmapAssets,
      mindmapDocs,
      mindmapAssets,
      mindmapAssetChildren: {},
      tableAssets: [],
      mediaAssets: (mediaAssets ?? []) as MediaAsset[],
    };
  }, [
    currentUser,
    documents,
    trashedDocuments,
    mindmaps,
    mediaAssets,
    trashedMediaAssets,
    workspacesResult,
    workspaceId,
  ]);

  // loading 状态：只有当 shouldFetch 为 true 且数据未加载时才算 loading
  // 使用 === undefined 判断，因为 skip 时返回 undefined
  const isLoading = shouldFetch && (
    currentUser === undefined ||
    documents === undefined ||
    trashedDocuments === undefined ||
    mindmaps === undefined ||
    mediaAssets === undefined ||
    trashedMediaAssets === undefined ||
    workspacesResult === undefined
  );
  const error = null;

  // Convex 模式下数据自动实时同步，refetch 是空操作
  // Convex 的 useQuery 会自动实时同步，无需手动 refetch
  // 这个方法只是为了保持与 useSidebarData 的接口兼容
  const refetch = async () => {
    // 空操作 - Convex 会自动同步数据
  };

  return { data, isLoading, error, refetch };
}