import { NextRequest, NextResponse } from "next/server";
import {
  CopilotRuntime,
  ExperimentalEmptyAdapter,
  copilotRuntimeNextJSAppRouterEndpoint,
} from "@copilotkit/runtime";
import { LangGraphAgent } from "@copilotkit/runtime/langgraph";

// Dedicated runtime for the Open Generative UI demos.
// Isolated here because the `openGenerativeUI` runtime flag sets
// `openGenerativeUIEnabled: true` globally on the probe response, which
// causes the CopilotKit provider's setTools effect to wipe per-demo
// `useFrontendTool`/`useComponent` registrations in the default runtime.

const LANGGRAPH_URL =
  process.env.LANGGRAPH_DEPLOYMENT_URL || "http://localhost:8123";

const openGenUiAgent = new LangGraphAgent({
  deploymentUrl: `${LANGGRAPH_URL}/`,
  graphId: "open_gen_ui",
  langsmithApiKey: process.env.LANGSMITH_API_KEY || "",
});
const openGenUiAdvancedAgent = new LangGraphAgent({
  deploymentUrl: `${LANGGRAPH_URL}/`,
  graphId: "open_gen_ui_advanced",
  langsmithApiKey: process.env.LANGSMITH_API_KEY || "",
});

const agents: Record<string, LangGraphAgent> = {
  "open-gen-ui": openGenUiAgent,
  "open-gen-ui-advanced": openGenUiAdvancedAgent,
};

export const POST = async (req: NextRequest) => {
  try {
    const { handleRequest } = copilotRuntimeNextJSAppRouterEndpoint({
      endpoint: "/api/copilotkit-ogui",
      serviceAdapter: new ExperimentalEmptyAdapter(),
      // @region[minimal-runtime-flag]
      // @region[advanced-runtime-config]
      // Server-side config is identical for the minimal and advanced cells —
      // the advanced behaviour (sandbox -> host function calls) is wired
      // entirely on the frontend via `openGenerativeUI.sandboxFunctions` on
      // the provider. The single `openGenerativeUI` flag below turns on
      // Open Generative UI for the listed agent(s); the runtime middleware
      // converts each agent's streamed `generateSandboxedUi` tool call into
      // `open-generative-ui` activity events.
      runtime: new CopilotRuntime({
        // @ts-ignore -- see main route.ts
        agents,
        openGenerativeUI: {
          agents: ["open-gen-ui", "open-gen-ui-advanced"],
        },
      }),
      // @endregion[advanced-runtime-config]
      // @endregion[minimal-runtime-flag]
    });
    return await handleRequest(req);
  } catch (error: any) {
    return NextResponse.json(
      { error: error.message, stack: error.stack },
      { status: 500 },
    );
  }
};
