#!/usr/bin/env node
import fs from 'fs';
import path from 'path';
import { fileURLToPath } from 'url';
import { spawn } from 'child_process';
import { checkLogin } from '../lib/login.mjs';
import { closeBrowser } from '../lib/browser.mjs';

const __dirname = path.dirname(fileURLToPath(import.meta.url));
const ROOT = path.join(__dirname, '..');
const RUNTIME_DIR = path.join(ROOT, '.runtime');
const SERVER_STATE = path.join(RUNTIME_DIR, 'server.json');
const DEFAULT_PORT = Number(process.env.XIANHU_PORT || process.env.PORT || 3000);

function usage() {
  console.log(`Usage:
  node tools/xianyu_ops.mjs status [--port 3000]
  node tools/xianyu_ops.mjs start [--port 3000]
  node tools/xianyu_ops.mjs stop
  node tools/xianyu_ops.mjs login
  node tools/xianyu_ops.mjs create --name <name> --queries <q1,q2> [--price-min N] [--price-max N] [--region 地区] [--pages N] --requirements <需求>
  node tools/xianyu_ops.mjs run --name <name> --queries <q1,q2> [--price-min N] [--price-max N] [--region 地区] [--pages N] --requirements <需求> [--limit 30]
  node tools/xianyu_ops.mjs report [--task <task_id>] [--limit 30]

Notes:
  - Web UI is optional/backup: http://127.0.0.1:<port>
  - login opens a persistent Chromium profile under ./browser-data.
  - create/run do not require project AI API configuration and never contact sellers.
`);
}

function take(args, flag) {
  const i = args.indexOf(flag);
  if (i === -1) return undefined;
  return args[i + 1];
}

function parseCommon(args) {
  return {
    port: Number(take(args, '--port') || DEFAULT_PORT),
    limit: Number(take(args, '--limit') || 30),
  };
}

function baseUrl(port) {
  return `http://127.0.0.1:${port}`;
}

async function sleep(ms) {
  await new Promise(resolve => setTimeout(resolve, ms));
}

async function fetchJson(url, options = {}) {
  const res = await fetch(url, options);
  const text = await res.text();
  let data = null;
  try { data = text ? JSON.parse(text) : null; } catch { data = text; }
  if (!res.ok) {
    throw new Error(`HTTP ${res.status}: ${typeof data === 'string' ? data : JSON.stringify(data)}`);
  }
  return data;
}

async function isServerReady(port) {
  try {
    await fetchJson(`${baseUrl(port)}/api/tasks`, { signal: AbortSignal.timeout(3000) });
    return true;
  } catch {
    return false;
  }
}

function readServerState() {
  try { return JSON.parse(fs.readFileSync(SERVER_STATE, 'utf-8')); } catch { return null; }
}

function writeServerState(state) {
  fs.mkdirSync(RUNTIME_DIR, { recursive: true });
  fs.writeFileSync(SERVER_STATE, JSON.stringify(state, null, 2), 'utf-8');
}

async function startServer(port) {
  if (await isServerReady(port)) {
    console.log(JSON.stringify({ ok: true, status: 'running', port, url: `${baseUrl(port)}/` }, null, 2));
    return;
  }

  const out = fs.openSync(path.join(ROOT, 'xianyu-server.log'), 'a');
  const child = spawn(process.execPath, ['server.mjs'], {
    cwd: ROOT,
    env: { ...process.env, PORT: String(port) },
    detached: true,
    stdio: ['ignore', out, out],
  });
  child.unref();
  writeServerState({ pid: child.pid, port, startedAt: new Date().toISOString(), log: path.join(ROOT, 'xianyu-server.log') });

  for (let i = 0; i < 30; i++) {
    if (await isServerReady(port)) {
      console.log(JSON.stringify({ ok: true, status: 'started', pid: child.pid, port, url: `${baseUrl(port)}/` }, null, 2));
      return;
    }
    await sleep(1000);
  }
  throw new Error(`server did not become ready on port ${port}; see xianyu-server.log`);
}

async function stopServer() {
  const state = readServerState();
  if (!state?.pid) {
    console.log(JSON.stringify({ ok: true, status: 'no-recorded-server' }, null, 2));
    return;
  }
  try {
    process.kill(state.pid, 'SIGTERM');
    fs.unlinkSync(SERVER_STATE);
    console.log(JSON.stringify({ ok: true, status: 'stopped', pid: state.pid }, null, 2));
  } catch (err) {
    console.log(JSON.stringify({ ok: false, status: 'stop-failed', pid: state.pid, error: err.message }, null, 2));
  }
}

async function status(port) {
  const ready = await isServerReady(port);
  console.log(JSON.stringify({ ok: true, running: ready, port, url: `${baseUrl(port)}/`, state: readServerState() }, null, 2));
}

async function login() {
  const emitLog = msg => console.log(msg);
  const ok = await checkLogin(emitLog);
  await closeBrowser();
  console.log(JSON.stringify({ ok, loggedIn: ok }, null, 2));
  if (!ok) process.exit(1);
}

function buildPayload(args) {
  const name = take(args, '--name') || `闲鱼监测-${new Date().toISOString().slice(0, 10)}`;
  const queriesRaw = take(args, '--queries');
  const requirements = take(args, '--requirements') || take(args, '--req');
  if (!queriesRaw || !requirements) {
    usage();
    process.exit(2);
  }
  return {
    name,
    queries: queriesRaw.split(/[,，]/).map(s => s.trim()).filter(Boolean),
    priceMin: take(args, '--price-min') ? Number(take(args, '--price-min')) : null,
    priceMax: take(args, '--price-max') ? Number(take(args, '--price-max')) : null,
    region: take(args, '--region') || '',
    personalSeller: args.includes('--personal-seller'),
    maxPages: take(args, '--pages') ? Number(take(args, '--pages')) : 3,
    customRequirements: requirements,
    coarsePrompt: '标题只做保守预筛：明显配件/维修/求购/租赁/广告才排除，拿不准保留。',
    finePrompt: '详情只做采集后的保守预筛：明显冲突才排除，候选后续由 Hermes 深度分析。',
    analysisMode: 'hermes',
  };
}

async function createTask(args, port) {
  await startServer(port);
  const payload = buildPayload(args);
  const task = await fetchJson(`${baseUrl(port)}/api/tasks`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify(payload),
  });
  console.log(JSON.stringify({ ok: true, task: { id: task.id, name: task.name, stage: task.stage }, url: `${baseUrl(port)}/` }, null, 2));
  return task;
}

async function waitTask(taskId, port) {
  for (;;) {
    const task = await fetchJson(`${baseUrl(port)}/api/tasks/${taskId}`);
    const counts = task.products || {};
    console.log(`[${new Date().toLocaleTimeString('zh-CN', { hour12: false })}] ${task.name} ${task.stage} raw=${counts.rawCount || 0} coarse=${counts.coarseCount || 0} fine=${counts.fineCount || 0}`);
    if (!task.running && ['completed', 'stopped'].includes(task.stage)) return task;
    await sleep(15000);
  }
}

async function report(args) {
  const taskId = take(args, '--task') || take(args, '--task-id');
  const limit = Number(take(args, '--limit') || 30);
  const child = spawn(process.execPath, ['tools/hermes_report.mjs', ...(taskId ? ['--task', taskId] : []), '--limit', String(limit)], {
    cwd: ROOT,
    stdio: 'inherit',
  });
  await new Promise((resolve, reject) => {
    child.on('exit', code => code === 0 ? resolve() : reject(new Error(`report exited with ${code}`)));
    child.on('error', reject);
  });
}

async function run(args, port) {
  const task = await createTask(args, port);
  const finished = await waitTask(task.id, port);
  await report(['--task', finished.id, '--limit', String(take(args, '--limit') || 30)]);
}

const [cmd, ...args] = process.argv.slice(2);
if (!cmd || args.includes('-h') || args.includes('--help')) {
  usage();
  process.exit(cmd ? 0 : 2);
}
const { port } = parseCommon(args);

try {
  if (cmd === 'status') await status(port);
  else if (cmd === 'start') await startServer(port);
  else if (cmd === 'stop') await stopServer();
  else if (cmd === 'login') await login();
  else if (cmd === 'create') await createTask(args, port);
  else if (cmd === 'run') await run(args, port);
  else if (cmd === 'report') await report(args);
  else {
    usage();
    process.exit(2);
  }
} catch (err) {
  console.error(`❌ ${err.message}`);
  process.exit(1);
}