import { NextResponse } from "next/server";
import { createSupabaseRouteClient } from "@/lib/supabase/server";
import { ensureDefaultWorkspace, fetchWorkspaceSummaries } from "@/lib/workspaces";
import { fetchSidebarDataset } from "@/lib/sidebar-tree";
import type { SidebarInitialData } from "@/components/sidebar/types";
import { isConvexEnabled } from "@/lib/convex/enabled";
import { getConvexHttpClient } from "@/lib/convex/server";
import { api } from "@/lib/convex/api";
import { requireAuthContext } from "@/lib/auth/authContext";
import { randomUUID } from "crypto";
import {
  detectLocalMindmapFiles,
  detectLocalMindmapDocs,
  detectLocalMindmapImageAssetIdsByMindmapId,
  detectLocalTrashedMindmapAssets,
} from "@/lib/server/mindmap-files";
import type { MediaAsset } from "@/types/media";

export const dynamic = "force-dynamic";

function extractMindmapImageAssetIdsFromData(input: unknown): string[] {
  const root = (() => {
    if (!input || typeof input !== "object") return input;
    // eslint-disable-next-line @typescript-eslint/no-explicit-any
    const record = input as any;
    // 兼容：某些导图结构为 { root: ... }
    return record && typeof record === "object" && "root" in record ? record.root : input;
  })();

  const ids: string[] = [];
  const seen = new Set<string>();

  const push = (value: unknown) => {
    if (typeof value !== "string") return;
    if (!value.startsWith("asset:")) return;
    const id = value.slice("asset:".length).trim();
    if (!id) return;
    if (seen.has(id)) return;
    seen.add(id);
    ids.push(id);
  };

  const get = (obj: unknown, key: string): unknown => {
    if (!obj || typeof obj !== "object") return undefined;
    return (obj as Record<string, unknown>)[key];
  };

  const walk = (node: unknown) => {
    if (!node || typeof node !== "object") return;

    const data = get(node, "data");
    const image = get(node, "image");

    // 常见：node.data.image = "asset:xxx"
    push(get(data, "image"));
    // 兼容：node.image = "asset:xxx"
    push(image);
    // 兼容：node.image.url = "asset:xxx"
    push(get(image, "url"));
    // 兼容：node.data.image.url = "asset:xxx"
    push(get(get(data, "image"), "url"));

    const children = get(node, "children");
    if (Array.isArray(children)) {
      children.forEach(walk);
    }
  };

  walk(root);
  return ids;
}

export async function GET(request: Request) {
  if (isConvexEnabled()) {
    const auth = requireAuthContext();
    const client = getConvexHttpClient();

    const url = new URL(request.url);
    const workspaceIdParam = url.searchParams.get("workspaceId");

    const bootstrap = await client.mutation(api.workspaces.ensureDefaultWorkspace, {
      userId: auth.userId,
      fallbackName: auth.email ?? auth.name ?? "我的空间",
      workspaceIdIfCreate: randomUUID(),
    });

    const summaries = await client.query(api.workspaces.fetchWorkspaceSummaries, {
      userId: auth.userId,
    });

    const workspaces = summaries.workspaces.length > 0 ? summaries.workspaces : bootstrap.workspaces;
    const activeWorkspaceId = summaries.activeWorkspaceId || bootstrap.activeWorkspaceId;
    const targetWorkspaceId = workspaceIdParam || activeWorkspaceId;

    if (!targetWorkspaceId) {
      return NextResponse.json({ error: "暂无可用工作空间" }, { status: 404 });
    }

    try {
      const documents = await client.query(api.documents.listByWorkspace, {
        userId: auth.userId,
        workspaceId: targetWorkspaceId,
      });

      const trashedDocuments = await client.query(api.documents.listTrashedByWorkspace, {
        userId: auth.userId,
        workspaceId: targetWorkspaceId,
      });

      const mindmapRows = await client.query(api.mindmaps.listByWorkspace, {
        userId: auth.userId,
        workspaceId: targetWorkspaceId,
        includeDeleted: true,
      });

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

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

      const mindmapAssetChildren: Record<string, string[]> = {};
      activeMindmaps.forEach((r) => {
        const ids = extractMindmapImageAssetIdsFromData(r.data);
        if (ids.length > 0) {
          mindmapAssetChildren[r.mindmap_id] = ids;
        }
      });

      const mindmapAssets: MediaAsset[] = activeMindmaps.map((r) => {
        const isLegacy = r.mindmap_id.startsWith("legacy-");
        return {
          id: r.mindmap_id,
          workspace_id: r.workspace_id ?? targetWorkspaceId,
          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 ?? targetWorkspaceId,
          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 ?? "",
        };
      });

      const payload: SidebarInitialData = {
        activeWorkspaceId: targetWorkspaceId,
        workspaces,
        documents,
        trashedDocuments,
        trashedMediaAssets: [],
        trashedMindmapAssets,
        mindmapDocs,
        mindmapAssets,
        mindmapAssetChildren,
        tableAssets: [],
        mediaAssets: [],
      };

      return NextResponse.json(payload);
    } catch (error) {
      return NextResponse.json(
        { error: error instanceof Error ? error.message : "拉取侧边栏数据失败" },
        { status: 500 },
      );
    }
  }

  const supabase = await createSupabaseRouteClient();
  const {
    data: { session },
  } = await supabase.auth.getSession();

  if (!session) {
    return NextResponse.json({ error: "未登录" }, { status: 401 });
  }

  const url = new URL(request.url);
  const workspaceIdParam = url.searchParams.get("workspaceId");

  await ensureDefaultWorkspace(supabase, session.user.id, session.user.email ?? "我的空间");
  const { workspaces, activeWorkspaceId } = await fetchWorkspaceSummaries(supabase, session.user.id);
  const targetWorkspaceId = workspaceIdParam || activeWorkspaceId;

  if (!targetWorkspaceId) {
    return NextResponse.json({ error: "暂无可用工作空间" }, { status: 404 });
  }

  try {
    const dataset = await fetchSidebarDataset(supabase, targetWorkspaceId);
    const docIds = dataset.documents.map((d) => d.id);
    const localMindmapFiles = await detectLocalMindmapFiles(docIds);
    const mindmapAssetChildren =
      await detectLocalMindmapImageAssetIdsByMindmapId(localMindmapFiles);
    const mindmapDocs = Array.from(new Set([...(dataset.mindmapDocs ?? []), ...(await detectLocalMindmapDocs(docIds))]));
    const trashedMindmapAssets = await detectLocalTrashedMindmapAssets(targetWorkspaceId, docIds);
    const docById = new Map(dataset.documents.map((d) => [d.id, d]));
    const mindmapAssets: MediaAsset[] = localMindmapFiles.map((item) => {       
      const doc = docById.get(item.documentId);
      const workspaceId = doc?.workspace_id ?? targetWorkspaceId;
      const fileUrlBase = item.source === "legacy" ? `/mindmaps/${item.documentId}` : `/documents/${item.documentId}`;
      return {
        id: item.mindmapId,
        workspace_id: workspaceId,
        document_id: item.documentId,
        asset_type: "mindmap",
        file_url: `${fileUrlBase}/${item.fileName}`,
        thumbnail_url: null,
        bucket: null,
        storage_path: null,
        file_name: item.fileName,
        file_size: null,
        mime_type: "application/json",
        ocr_payload: undefined,
        ocr_strategy: null,
        ocr_text: null,
        ocr_status: null,
        signed_url: null,
        created_at: "",
        updated_at: "",
      };
    });

    const tableAssets: MediaAsset[] = (dataset.tables ?? []).map((row) => {
      const base = (row.title ?? "未命名表格").trim() || "未命名表格";
      const fileName = base.toLowerCase().endsWith(".luckysheet") ? base : `${base}.luckysheet`;
      return {
        id: row.id,
        workspace_id: row.workspace_id ?? targetWorkspaceId,
        document_id: row.document_id,
        asset_type: "luckysheet",
        file_url: `/tables/${row.id}/view`,
        thumbnail_url: null,
        bucket: null,
        storage_path: null,
        file_name: fileName,
        file_size: null,
        mime_type: "application/json",
        ocr_payload: undefined,
        ocr_strategy: null,
        ocr_text: null,
        ocr_status: null,
        signed_url: null,
        created_at: row.created_at ?? "",
        updated_at: row.updated_at ?? "",
      };
    });

    const payload: SidebarInitialData = {
      activeWorkspaceId: targetWorkspaceId,
      workspaces,
      documents: dataset.documents,
      trashedDocuments: dataset.trashedDocuments,
      trashedMediaAssets: dataset.trashedMediaAssets ?? [],
      trashedMindmapAssets,
      mindmapDocs,
      mindmapAssets,
      mindmapAssetChildren,
      tableAssets,
      mediaAssets: dataset.mediaAssets ?? [],
    };

    return NextResponse.json(payload);
  } catch (error) {
    return NextResponse.json(
      { error: error instanceof Error ? error.message : "拉取侧边栏数据失败" },
      { status: 500 },
    );
  }
}