import { PassThrough } from 'node:stream';
import { describe, expect, it, vi } from 'vitest';
import { JsonRpcPeer, JsonRpcRequestError } from './jsonRpcPeer';

/** 移植自 Noobi.ai src/main/jsonRpcPeer.test.ts：纯内存流，不依赖 codex 二进制与网络 */

function makePeer() {
  const input = new PassThrough();
  const output = new PassThrough();
  output.setEncoding('utf8');
  const peer = new JsonRpcPeer(input, output);
  peer.start();
  return { input, output, peer };
}

describe('JsonRpcPeer', () => {
  it('把响应匹配回对应的 pending 请求', async () => {
    const { input, output, peer } = makePeer();
    const written = new Promise<string>((resolve) => output.once('data', resolve));
    const pending = peer.request<{ models: unknown[] }>('model/list');

    const request = JSON.parse(await written) as { id: number; method: string };
    expect(request.method).toBe('model/list');
    input.write(`${JSON.stringify({ id: request.id, result: { models: [] } })}\n`);

    await expect(pending).resolves.toEqual({ models: [] });
    peer.close();
  });

  it('区分通知与服务端请求，且能交错处理', async () => {
    const { input, peer } = makePeer();
    const notification = vi.fn();
    const serverRequest = vi.fn();
    peer.on('notification', notification);
    peer.on('serverRequest', serverRequest);

    input.write('{"method":"turn/started","params":{"turnId":"turn-1"}}\n');
    input.write('{"id":"approval-1","method":"item/commandExecution/requestApproval","params":{}}\n');

    await new Promise((resolve) => setImmediate(resolve));
    expect(notification).toHaveBeenCalledWith({
      method: 'turn/started',
      params: { turnId: 'turn-1' },
    });
    expect(serverRequest).toHaveBeenCalledWith({
      id: 'approval-1',
      method: 'item/commandExecution/requestApproval',
      params: {},
    });
    peer.close();
  });

  it('把 App Server 返回的协议错误抛给调用方', async () => {
    const { input, output, peer } = makePeer();
    const written = new Promise<string>((resolve) => output.once('data', resolve));
    const pending = peer.request('thread/start');
    const request = JSON.parse(await written) as { id: number };
    input.write(`${JSON.stringify({
      id: request.id,
      error: { code: -32602, message: 'invalid params' },
    })}\n`);

    await expect(pending).rejects.toBeInstanceOf(JsonRpcRequestError);
    peer.close();
  });

  it('遇到非法 JSON 只报错、不中断流', async () => {
    const { input, peer } = makePeer();
    const protocolError = vi.fn();
    const notification = vi.fn();
    peer.on('protocolError', protocolError);
    peer.on('notification', notification);

    input.write('{not-json}\n');
    input.write('{"method":"warning","params":{"message":"still alive"}}\n');
    await new Promise((resolve) => setImmediate(resolve));

    expect(protocolError).toHaveBeenCalledOnce();
    expect(notification).toHaveBeenCalledOnce();
    peer.close();
  });

  it('关闭后拒绝全部 pending 请求并广播 closed', async () => {
    const { peer } = makePeer();
    const closed = vi.fn();
    peer.on('closed', closed);
    const pending = peer.request('model/list');

    peer.close(new Error('子进程退出'));

    await expect(pending).rejects.toThrow('子进程退出');
    expect(closed).toHaveBeenCalledOnce();
    await expect(peer.request('model/list')).rejects.toThrow('已关闭');
  });
});