/*
 * MC Report System
 * Copyright (C) 2026 Sea Network Technology Studio
 * Author: CangLan <admin@sea-studio.top>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published
 * by the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

const { query, getRow } = require('./db');
const { logSystem } = require('./logger');

const EVENT_LABELS = { ticket_created:'工单创建', ticket_claimed:'工单认领', ticket_transferred:'工单转交', ticket_updated:'工单更新' };

const dns = require('dns').promises;
const { URL } = require('url');

async function isPrivateUrl(urlStr) {
  try {
    const u = new URL(urlStr);
    if (u.hostname === 'localhost' || u.hostname === '127.0.0.1' || u.hostname === '0.0.0.0') return true;
    if (u.hostname.startsWith('192.168.') || u.hostname.startsWith('10.') || u.hostname.startsWith('172.16.')) return true;
    const addrs = await dns.resolve4(u.hostname).catch(() => []);
    for (const addr of addrs) {
      if (addr === '127.0.0.1' || addr.startsWith('192.168.') || addr.startsWith('10.') || addr.startsWith('172.16.') || addr.startsWith('0.')) return true;
    }
    return false;
  } catch { return true; }
}

async function sendWebhook(event, data) {
  try {
    const configs = await query("SELECT * FROM notification_configs WHERE type = 'webhook' AND active = 1");
    for (const cfg of configs) {
      const events = cfg.events || 'all';
      if (events !== 'all' && !events.split(',').map(s=>s.trim()).includes(event)) continue;
      if (cfg.webhook_url && await isPrivateUrl(cfg.webhook_url)) { console.error('[Webhook] blocked internal URL:', cfg.name); await logSystem('warn', 'webhook', `拦截内网地址: ${cfg.name}`, { url: cfg.webhook_url }); continue; }
      const embed = buildEmbed(event, data);
      try {
        const ctl = new AbortController();
        const t = setTimeout(() => ctl.abort(), 10000);
        const resp = await fetch(cfg.webhook_url, { method:'POST', headers:{'Content-Type':'application/json'}, body:JSON.stringify(embed), signal: ctl.signal });
        clearTimeout(t);
        if (resp.status < 200 || resp.status >= 300) {
          await logSystem('warn', 'webhook', `Webhook ${cfg.name} 返回 ${resp.status}`, { event, url: cfg.webhook_url });
        }
      } catch (e) {
        console.error('[Webhook]', cfg.name, e.message);
        await logSystem('error', 'webhook', `Webhook ${cfg.name} 发送失败: ${e.message}`, { event, url: cfg.webhook_url });
      }
    }
  } catch {}
}

function buildEmbed(event, data) {
  const row = data._siteName ? { v: data._siteName } : null;
  const siteName = row?.v || 'MC举报系统';
  const colors = { ticket_created:0x4f46e5, ticket_claimed:0x10b981, ticket_transferred:0xf59e0b, ticket_updated:0x3b82f6 };
  const embed = { username: siteName, embeds:[{ title:EVENT_LABELS[event]||event, color:colors[event]||0x4f46e5, timestamp:new Date().toISOString(), fields:[] }] };
  if (event==='ticket_created') { embed.embeds[0].description=`**#${data.ticket_id}** - ${data.ticket_title||''}`; embed.embeds[0].fields.push({name:'类型',value:data.ticket_type||data.type||'?',inline:true},{name:'提交者',value:`${data.reporter_game_name||'?'} (UID:${data.reporter_game_uid||'?'})`,inline:true}); }
  else if (event==='ticket_claimed') { embed.embeds[0].description=`**#${data.ticket_id}** - ${data.ticket_title}`; embed.embeds[0].fields.push({name:'认领人',value:data.assigned_to||'?',inline:true}); }
  else if (event==='ticket_transferred') { embed.embeds[0].description=`**#${data.ticket_id}** - ${data.ticket_title}`; embed.embeds[0].fields.push({name:'转出',value:data.from_user||'?',inline:true},{name:'转入',value:data.to_user||'?',inline:true}); }
  else if (event==='ticket_updated') { embed.embeds[0].description=`**#${data.ticket_id}** - ${data.ticket_title}`; if(data.new_status)embed.embeds[0].fields.push({name:'新状态',value:data.new_status,inline:true}); }
  return embed;
}

module.exports = { sendWebhook, isPrivateUrl };