import express from 'express';
import type { AddressInfo } from 'node:net';
import { afterEach, describe, expect, it, vi } from 'vitest';
import type { WebContext } from '../../src/web/context.js';
import { createConfigRouter } from '../../src/web/routes/config.js';
import { ConfigSchema, type Config } from '../../src/config/index.js';
import { getTestConfig } from '../testUtils.js';

const servers: Array<ReturnType<express.Express['listen']>> = [];

async function request(app: express.Express, path: string, init?: RequestInit): Promise<Response> {
  const server = app.listen(0);
  servers.push(server);
  await new Promise<void>((resolve) => server.once('listening', resolve));
  const { port } = server.address() as AddressInfo;
  return fetch(`http://127.0.0.1:${port}${path}`, init);
}

afterEach(async () => {
  await Promise.all(servers.splice(0).map((server) => new Promise<void>((resolve) => server.close(() => resolve()))));
});

function harness() {
  // Deep-cloned because zod reuses one default object across parses, so two
  // harnesses would otherwise share the same `conversations` instance.
  const config = structuredClone(ConfigSchema.parse(getTestConfig())) as Config;
  const saved: Config[] = [];
  const ctx = {
    config,
    runtimeConfig: config,
    services: { configStore: { save: (next: Config) => saved.push(next) } },
    getOnConfigChange: () => undefined,
    activity: { push: vi.fn() },
    broadcaster: { push: vi.fn() },
    logger: { error: vi.fn(), info: vi.fn(), warn: vi.fn() },
  } as unknown as WebContext;
  const app = express();
  app.use(express.json());
  app.use('/api', createConfigRouter(ctx));
  return { app, config, saved };
}

describe('config route conversation kill controls', () => {
  it('exposes the conversation section in the advanced payload', async () => {
    const { app } = harness();

    const body = await (await request(app, '/api/config')).json();

    expect(body.advanced.conversations).toEqual({
      offPlatformKill: true,
      killOnSellerKeyword: true,
      aiReplyScreening: { enabled: false, killConfidence: 0.8, flagConfidence: 0.6 },
    });
  });

  it('persists an edited conversation section in place, so running runtimes see it', async () => {
    const { app, config, saved } = harness();
    const conversationsRef = config.conversations;
    const screeningRef = config.conversations.aiReplyScreening;
    const current = await (await request(app, '/api/config')).json();

    const response = await request(app, '/api/config', {
      method: 'PUT',
      headers: { 'content-type': 'application/json' },
      body: JSON.stringify({
        advanced: {
          ...current.advanced,
          conversations: {
            offPlatformKill: true,
            killOnSellerKeyword: false,
            aiReplyScreening: { enabled: true, killConfidence: 0.9, flagConfidence: 0.7 },
          },
        },
      }),
    });

    expect(response.status).toBe(200);
    // Same objects, mutated: an account runtime holding this reference reads
    // the new values on its next reply without being rebuilt.
    expect(config.conversations).toBe(conversationsRef);
    expect(config.conversations.aiReplyScreening).toBe(screeningRef);
    expect(config.conversations.killOnSellerKeyword).toBe(false);
    expect(config.conversations.aiReplyScreening).toEqual({
      enabled: true, killConfidence: 0.9, flagConfidence: 0.7,
    });
    expect(saved.at(-1)?.conversations.aiReplyScreening.enabled).toBe(true);
  });

  it('rejects an out-of-range screening threshold', async () => {
    const { app, config } = harness();
    const current = await (await request(app, '/api/config')).json();

    const response = await request(app, '/api/config', {
      method: 'PUT',
      headers: { 'content-type': 'application/json' },
      body: JSON.stringify({
        advanced: {
          ...current.advanced,
          conversations: {
            offPlatformKill: true,
            killOnSellerKeyword: true,
            aiReplyScreening: { enabled: true, killConfidence: 4, flagConfidence: 0.7 },
          },
        },
      }),
    });

    expect(response.status).toBe(400);
    expect(config.conversations.aiReplyScreening.enabled).toBe(false);
  });
});