#!/usr/bin/env node
'use strict';

/**
 * 创建/更新 WhatsApp inbox，并配置「新会话 → AI Assistant」automation。
 *
 * .env 需要：
 *   WA_PHONE_NUMBER_ID / WA_WABA_ID / WA_ACCESS_TOKEN / WA_APP_SECRET
 *   WA_VERIFY_TOKEN / WA_INBOX_NAME（可选）
 *   WA_API_VERSION（可选，默认 v26.0）
 *
 * 前提：LibreDesk app.root_url 已是公网 HTTPS（scripts/public-https.sh），
 * 否则 Meta 无法回调，自动订阅也会失败。
 */
const fs = require('fs');
const path = require('path');

const ROOT = path.resolve(__dirname, '..');
const RULE_PREFIX = 'Assign WhatsApp conversations to AI Assistant';

function loadEnv(file) {
  const out = {};
  for (const line of fs.readFileSync(file, 'utf8').split('\n')) {
    const t = line.trim();
    if (!t || t.startsWith('#')) continue;
    const eq = t.indexOf('=');
    if (eq < 0) continue;
    let v = t.slice(eq + 1).trim();
    if ((v.startsWith('"') && v.endsWith('"')) || (v.startsWith("'") && v.endsWith("'"))) v = v.slice(1, -1);
    out[t.slice(0, eq).trim()] = v;
  }
  return out;
}

function createClient(baseURL) {
  const cookies = new Map();
  let csrf = '';
  const cookieHeader = () => [...cookies.entries()].map(([k, v]) => `${k}=${v}`).join('; ');
  function store(res) {
    const list = typeof res.headers.getSetCookie === 'function' ? res.headers.getSetCookie() : [res.headers.get('set-cookie')].filter(Boolean);
    for (const c of list) {
      const [pair] = c.split(';');
      const eq = pair.indexOf('=');
      if (eq > 0) {
        const k = pair.slice(0, eq).trim();
        const v = pair.slice(eq + 1).trim();
        cookies.set(k, v);
        if (k === 'csrf_token') csrf = v;
      }
    }
  }
  async function req(method, p, body) {
    const headers = { Accept: 'application/json' };
    if (cookies.size) headers.Cookie = cookieHeader();
    if (body !== undefined) headers['Content-Type'] = 'application/json';
    if (csrf && method !== 'GET') headers['X-CSRFTOKEN'] = csrf;
    const res = await fetch(baseURL + p, { method, headers, body: body === undefined ? undefined : JSON.stringify(body) });
    store(res);
    const text = await res.text();
    let json = null;
    try { json = text ? JSON.parse(text) : null; } catch { /* ignore */ }
    if (!res.ok) throw new Error(`${method} ${p} -> HTTP ${res.status}: ${(json && (json.message || json.error)) || text.slice(0, 300)}`);
    return json;
  }
  return { get: (p) => req('GET', p), post: (p, b) => req('POST', p, b), put: (p, b) => req('PUT', p, b) };
}

const data = (j) => (j && j.data !== undefined ? j.data : j);

async function main() {
  const env = loadEnv(path.join(ROOT, '.env'));
  const base = (env.LIBREDESK_BASE_URL || 'http://192.168.31.61:9000').replace(/\/+$/, '');
  const required = ['WA_PHONE_NUMBER_ID', 'WA_WABA_ID', 'WA_ACCESS_TOKEN', 'WA_APP_SECRET', 'WA_VERIFY_TOKEN'];
  const missing = required.filter((k) => !env[k]);
  if (missing.length) throw new Error(`.env 缺少: ${missing.join(', ')}`);

  const c = createClient(base);
  await c.post('/api/v1/auth/login', { email: env.LIBREDESK_SYSTEM_EMAIL || 'System', password: env.LIBREDESK_SYSTEM_USER_PASSWORD });
  console.log('登录成功');

  const inboxName = env.WA_INBOX_NAME || 'WhatsApp US';
  const payload = {
    name: inboxName,
    channel: 'whatsapp',
    enabled: true,
    config: {
      phone_number_id: env.WA_PHONE_NUMBER_ID,
      waba_id: env.WA_WABA_ID,
      access_token: env.WA_ACCESS_TOKEN,
      app_secret: env.WA_APP_SECRET,
      webhook_verify_token: env.WA_VERIFY_TOKEN,
      api_version: env.WA_API_VERSION || 'v26.0',
    },
  };

  const inboxes = data(await c.get('/api/v1/inboxes')) || [];
  let inbox = inboxes.find((i) => i.channel === 'whatsapp' && i.name === inboxName);
  if (!inbox) {
    inbox = data(await c.post('/api/v1/inboxes', payload));
    console.log(`创建 WhatsApp Inbox #${inbox.id}`);
  } else {
    inbox = data(await c.put(`/api/v1/inboxes/${inbox.id}`, payload));
    console.log(`更新 WhatsApp Inbox #${inbox.id}`);
  }

  // automation: WhatsApp inbox 新会话 -> AI Assistant
  const assistants = data(await c.get('/api/v1/ai/assistants')) || [];
  const assistant = assistants.find((a) => a.name === (env.AI_ASSISTANT_NAME || 'Yehwang Assistant'));
  if (!assistant) throw new Error('未找到 AI Assistant，先运行 scripts/setup-defaults.js');

  const ruleName = `${RULE_PREFIX} #${inbox.id}`;
  const rulesRaw = data(await c.get('/api/v1/automations/rules?type=new_conversation')) || [];
  const rules = Array.isArray(rulesRaw) ? rulesRaw : (rulesRaw.rules || []);
  const rulePayload = {
    name: ruleName,
    description: 'Route new WhatsApp conversations to the AI assistant',
    type: 'new_conversation',
    events: [],
    enabled: true,
    weight: 0,
    rules: [{
      type: 'new_conversation',
      execution_mode: 'all',
      event: [],
      group_operator: 'AND',
      groups: [{
        logical_op: 'AND',
        rules: [{ field: 'inbox', field_type: 'conversation', operator: 'equals', value: String(inbox.id), case_sensitive_match: false }],
      }],
      actions: [{ type: 'assign_user', value: [String(assistant.user_id)], display_value: [assistant.name] }],
    }],
  };
  const existing = rules.find((r) => r.name === ruleName);
  if (!existing) {
    const rule = data(await c.post('/api/v1/automations/rules', rulePayload));
    console.log(`创建 Automation #${rule.id}（inbox ${inbox.id} → user ${assistant.user_id}）`);
  } else {
    const rule = data(await c.put(`/api/v1/automations/rules/${existing.id}`, rulePayload));
    console.log(`更新 Automation #${rule.id}（inbox ${inbox.id} → user ${assistant.user_id}）`);
  }

  const root = env.PUBLIC_BASE_URL || '<app.root_url>';
  console.log('\nWhatsApp Inbox 配置完成');
  console.log(`Inbox ID: ${inbox.id}`);
  console.log(`Callback URL: ${root}/webhooks/whatsapp/${inbox.id}`);
  console.log(`Verify Token: ${env.WA_VERIFY_TOKEN}`);
  console.log('Meta -> WhatsApp -> Configuration -> Webhook 里填上面两项，订阅 messages');
}

main().catch((err) => {
  console.error('[add-whatsapp-inbox]', err.message);
  process.exit(1);
});