import { adaptWorkflowLookupItem } from "@/lib/adapters/workflows";
import { backendRequest } from "@/lib/http/backend-client";
import {
  jsonSuccess,
  parsePositiveIntegerParam,
  withErrorHandling,
} from "@/lib/http/response";
import type { OrderStatus, WorkflowListResponseDto } from "@/lib/types/backend";

const MESSAGE = "流程追踪首页当前显示真实后端最近流程。";
const DEFAULT_LIMIT = 8;
const ALLOWED_STATUS = new Set<OrderStatus>([
  "created",
  "running",
  "waiting_review",
  "succeeded",
  "failed",
  "cancelled",
]);

export async function GET(request: Request) {
  return withErrorHandling(async () => {
    const url = new URL(request.url);
    const pageParam = url.searchParams.get("page");
    const limitParam = url.searchParams.get("limit");
    const queryParam = url.searchParams.get("query")?.trim();
    const statusParam = url.searchParams.get("status")?.trim();
    const params = new URLSearchParams({
      page: String(
        pageParam ? parsePositiveIntegerParam(pageParam, "page") : 1,
      ),
      limit: String(
        limitParam ? parsePositiveIntegerParam(limitParam, "limit") : DEFAULT_LIMIT,
      ),
    });

    if (statusParam && ALLOWED_STATUS.has(statusParam as OrderStatus)) {
      params.set("status", statusParam);
    }

    if (queryParam) {
      params.set("query", queryParam);
    }

    const response = await backendRequest<WorkflowListResponseDto>(
      `/workflows?${params.toString()}`,
    );

    return jsonSuccess(
      {
        page: response.data.page,
        limit: response.data.limit,
        total: response.data.total,
        totalPages: response.data.total_pages,
        items: response.data.items.map(adaptWorkflowLookupItem),
      },
      {
        mode: "proxy",
        message: MESSAGE,
      },
    );
  });
}