const express = require('express');
const { query, getRow } = require('../db');
const { authenticate } = require('../middleware/auth');

const router = express.Router();

const { getConfig } = require('../db');

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' });
}

router.use(externalAuth);

router.post('/tickets', async (req, res) => {
  const { type, title, reporter_game_name, reporter_game_uid,
    target_game_name, target_game_uid, reason, description } = req.body;

  if (!type || !['report','suggestion','appeal'].includes(type)) return res.status(400).json({ error: '类型不正确' });
  if (!title) return res.status(400).json({ error: '标题不能为空' });
  if (!reporter_game_name || !reporter_game_uid) return res.status(400).json({ error: '请填写游戏名称和UID' });

  if (type === 'report') {
    if (!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') {
    if (!reason) return res.status(400).json({ error: '请填写申诉理由' });
    if (!description) return res.status(400).json({ error: '请填写详细申诉内容' });
  }

  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 = require('uuid').v4();
  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) VALUES (?,?,?,?,?,?,?,?,?)`,
    [type, title, reporter_game_name, reporter_game_uid,
      (type==='report')?(target_game_name||''):null,
      (type==='report')?(target_game_uid||''):null,
      (type==='report'||type==='appeal')?reason:null,
      (type==='suggestion'||type==='appeal')?description:'',
      trackingToken]);

  await query("INSERT INTO responses(ticket_id, content, is_staff) VALUES (?,?,0)", [r.insertId, `游戏内${type==='report'?'举报':type==='appeal'?'申诉':'建议'}\n提交人: ${reporter_game_name} (UID: ${reporter_game_uid})\n${reason||description||''}`]);

  res.status(201).json({ id: r.insertId, tracking_token: trackingToken });
});

router.get('/tickets', async (req, res) => {
  const { type, status, page, limit } = req.query;
  let q = `SELECT t.id, t.type, t.title, t.status, t.priority,
    t.reporter_game_name, t.reporter_game_uid,
    t.target_game_name, t.target_game_uid,
    t.reason, t.description, t.assigned_to, t.claim_note,
    t.created_at, t.updated_at
    FROM tickets t WHERE 1=1`;
  const p = [];
  if (type) { q += ' AND t.type = ?'; p.push(type); }
  if (status) { q += ' AND t.status = ?'; p.push(status); }
  const pg = parseInt(page) || 1;
  const lm = Math.min(parseInt(limit) || 50, 200);
  q += ` ORDER BY t.updated_at DESC LIMIT ${(pg-1)*lm}, ${lm}`;
  res.json(await query(q, p));
});

router.get('/tickets/:id', 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 = ?`, [req.params.id]);
  if (!t) return res.status(404).json({ error: '工单不存在' });
  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 });
});

router.get('/users', async (req, res) => {
  res.json(await query('SELECT id, username, email, game_name, game_uid, role, active, created_at FROM users ORDER BY id'));
});

router.get('/user/:id', async (req, res) => {
  const u = await getRow('SELECT id, username, email, game_name, game_uid, role, active, created_at FROM users WHERE id = ?', [req.params.id]);
  if (!u) return res.status(404).json({ error: '用户不存在' });
  res.json(u);
});

module.exports = router;