const express = require('express');
const bcrypt = require('bcryptjs');
const { v4: uuid } = require('uuid');
const { query, getRow, getConfig } = require('../db');
const { generateToken, authenticate } = require('../middleware/auth');
const { sendEmail } = require('../mailer');

const router = express.Router();

function getExternalKey() {
  try { return getConfig()?.external_api_key || process.env.EXTERNAL_API_KEY || ''; } catch { return process.env.EXTERNAL_API_KEY || ''; }
}

function externalAuth(req, res, next) {
  const required = getExternalKey();
  if (!required) return next();
  if (req.headers['x-external-key'] === required) return next();
  return res.status(401).json({ error: '未授权' });
}

// ---- Auth (no external key needed) ----
router.post('/auth/register', async (req, res) => {
  try {
    const { username, password, email, game_name, game_uid } = req.body;
    if (!username || !password || !email || !game_name || !game_uid) return res.status(400).json({ error: '所有字段必填' });
    if (password.length < 6) return res.status(400).json({ error: '密码至少6位' });
    if (await getRow('SELECT id FROM users WHERE username = ?', [username])) return res.status(400).json({ error: '用户名已存在' });
    if (await getRow('SELECT id FROM users WHERE email = ?', [email])) return res.status(400).json({ error: '邮箱已注册' });

    const hashed = bcrypt.hashSync(password, 10);
    const verifyToken = uuid();
    await query('INSERT INTO users(username,password,email,game_name,game_uid,verify_token,verify_expires) VALUES (?,?,?,?,?,?,DATE_ADD(NOW(), INTERVAL 24 HOUR))', [username, hashed, email, game_name, game_uid, verifyToken]);

    const site = await getRow("SELECT v FROM settings WHERE k='site_url'");
    const sent = await sendEmail(email, 'verify_email', { username, game_name, game_uid, verify_link: `${site?.v||'http://localhost:3100'}#/verify?token=${verifyToken}` });

    if (!sent) {
      await query('UPDATE users SET email_verified=1,active=1,verify_token=NULL WHERE username=?', [username]);
      return res.status(201).json({ message: '注册成功！已自动激活，请登录' });
    }
    res.status(201).json({ message: '注册成功，请查收验证邮件' });
  } catch (e) { res.status(500).json({ error: '服务器错误' }); }
});

router.post('/auth/login', async (req, res) => {
  try {
    const { username, password } = req.body;
    if (!username || !password) return res.status(400).json({ error: '请输入用户名和密码' });
    const user = await getRow('SELECT * FROM users WHERE username = ?', [username]);
    if (!user || !bcrypt.compareSync(password, user.password)) return res.status(401).json({ error: '用户名或密码错误' });
    if (!user.active) return res.status(403).json({ error: '账号未激活' });
    const token = generateToken(user);
    res.json({ token, user: { id:user.id, username:user.username, game_name:user.game_name, game_uid:user.game_uid, role:user.role } });
  } catch (e) { res.status(500).json({ error: '服务器错误' }); }
});

// ---- Plugin API (JWT auth) ----
router.use(externalAuth);

router.get('/my-tickets', authenticate, async (req, res) => {
  const { limit } = req.query;
  const rows = await query(`SELECT id, type, title, status, priority, created_at, updated_at FROM tickets WHERE user_id = ? ORDER BY updated_at DESC LIMIT ?`, [req.user.id, Math.min(parseInt(limit)||10, 50)]);
  res.json({ list: rows });
});

router.get('/my-tickets/:id', authenticate, async (req, res) => {
  const t = await getRow(`SELECT id, type, title, status, priority, reporter_game_name, reporter_game_uid,
    target_game_name, target_game_uid, reason, description, assigned_to, claim_note, created_at, updated_at
    FROM tickets WHERE id = ? AND user_id = ?`, [req.params.id, req.user.id]);
  if (!t) return res.status(404).json({ error: '工单不存在' });
  res.json(t);
});

router.post('/tickets', async (req, res) => {
  const { type, title, reporter_game_name, reporter_game_uid, target_game_name, target_game_uid, reason, description, is_admin_complaint } = req.body;
  if (!type || !['report','suggestion','appeal'].includes(type)) return res.status(400).json({ error: '类型不正确' });
  if (!title || !reporter_game_name || !reporter_game_uid) return res.status(400).json({ error: '必填字段不完整' });
  if (type === 'report' && !reason) return res.status(400).json({ error: '请填写举报原因' });
  if (type === 'suggestion' && !description) return res.status(400).json({ error: '建议内容不能为空' });
  if (type === 'appeal' && (!reason || !description)) return res.status(400).json({ error: '请填写完整申诉信息' });

  const countRow = await getRow("SELECT COUNT(*) as c FROM tickets WHERE (reporter_game_name = ? OR reporter_game_uid = ?) AND status IN ('pending','processing','awaiting_info','appealing')", [reporter_game_name, reporter_game_uid]);
  if (countRow.c >= 5) return res.status(400).json({ error: '待处理工单已达上限' });

  const trackingToken = uuid();
  const [r] = await query(`INSERT INTO tickets(type,title,reporter_game_name,reporter_game_uid,target_game_name,target_game_uid,reason,description,tracking_token,is_admin_complaint) VALUES (?,?,?,?,?,?,?,?,?,?,?)`,
    [type, title, reporter_game_name, reporter_game_uid, target_game_name||'', target_game_uid||'', reason||'', description||'', trackingToken, is_admin_complaint?1:0]);
  await query("INSERT INTO responses(ticket_id,content,is_staff) VALUES (?,?,0)", [r.insertId, `游戏内提交\n类型: ${type}\n提交人: ${reporter_game_name} (UID: ${reporter_game_uid})`]);
  res.status(201).json({ id: r.insertId, tracking_token: trackingToken });
});

// ---- Java Server API (x-external-key only) ----
router.get('/all-tickets', async (req, res) => {
  const { type, status, page, limit } = req.query;
  let q = `SELECT id, type, title, status, priority, reporter_game_name, reporter_game_uid, target_game_name, target_game_uid, reason, description, assigned_to, claim_note, created_at, updated_at FROM tickets WHERE 1=1`;
  const p = [];
  if (type) { q += ' AND type = ?'; p.push(type); }
  if (status) { q += ' AND status = ?'; p.push(status); }
  const pg = parseInt(page) || 1;
  const lm = Math.min(parseInt(limit) || 50, 200);
  q += ` ORDER BY updated_at DESC LIMIT ${(pg-1)*lm}, ${lm}`;
  res.json(await query(q, p));
});

router.get('/all-tickets/:id', async (req, res) => {
  const t = await getRow('SELECT * FROM tickets WHERE id = ?', [req.params.id]);
  if (!t) return res.status(404).json({ error: 'Not found' });
  t.responses = await query('SELECT content, is_staff, created_at FROM responses WHERE ticket_id = ? ORDER BY created_at ASC', [req.params.id]);
  t.attachments = await query('SELECT id, original_name, mime_type, size FROM attachments WHERE ticket_id = ?', [req.params.id]);
  res.json(t);
});

router.get('/reported-players', async (req, res) => {
  const rows = await query(`SELECT target_game_name, target_game_uid, COUNT(*) as total,
    SUM(CASE WHEN status IN ('pending','processing','awaiting_info','appealing') THEN 1 ELSE 0 END) as active,
    SUM(CASE WHEN status='resolved' THEN 1 ELSE 0 END) as resolved,
    MAX(created_at) as last_report
    FROM tickets WHERE type='report' AND target_game_name IS NOT NULL AND target_game_name != ''
    GROUP BY target_game_name, target_game_uid ORDER BY total DESC LIMIT 500`);
  res.json(rows);
});

router.get('/stats', async (req, res) => {
  const [[{c:total}], byType, byStatus] = await Promise.all([
    query('SELECT COUNT(*) as c FROM tickets'),
    query('SELECT type, COUNT(*) as c FROM tickets GROUP BY type'),
    query('SELECT status, COUNT(*) as c FROM tickets GROUP BY status'),
  ]);
  res.json({ total, byType, byStatus });
});

module.exports = router;