import type { DurableQueue } from "./durable.ts";
import { queueDashboardSnapshot, renderQueueDashboard } from "./scheduler.ts";

export interface QueueAdminOptions {
  queues: Record<string, DurableQueue>;
  authorize?: (request: Request) => boolean | Promise<boolean>;
}

/** Framework-neutral protected queue dashboard/API handler, mountable at any route. */
export function createQueueAdminHandler(options: QueueAdminOptions) {
  return async (request: Request): Promise<Response> => {
    if (options.authorize && !(await options.authorize(request))) {
      return Response.json({ error: "Forbidden" }, { status: 403 });
    }
    const url = new URL(request.url);
    const name = url.searchParams.get("queue") ?? Object.keys(options.queues)[0];
    const queue = name ? options.queues[name] : undefined;
    if (!queue) return Response.json({ error: "Queue not found" }, { status: 404 });
    const id = url.searchParams.get("id");
    if (request.method === "POST" && id) {
      const action = url.searchParams.get("action");
      const changed =
        action === "retry"
          ? await queue.retry(id)
          : action === "cancel"
            ? await queue.cancel(id)
            : false;
      return Response.json({ ok: changed });
    }
    const snapshot = await queueDashboardSnapshot(queue);
    if (url.searchParams.get("format") === "json")
      return Response.json({ queue: name, ...snapshot });
    return new Response(renderQueueDashboard(snapshot), {
      headers: { "content-type": "text/html; charset=utf-8" },
    });
  };
}