// 日志模块: 邮件日志 + 系统日志, 写入数据库供后台查看
// 所有写库操作 try/catch 包裹, 日志失败绝不影响主流程
const { query } = require('./db');

// 系统日志: level = info | warn | error
async function logSystem(level, source, message, details) {
  try {
    await query(
      'INSERT INTO system_logs(level, source, message, details) VALUES (?,?,?,?)',
      [level || 'info', String(source || '').slice(0, 50), String(message || '').slice(0, 2000),
       details ? JSON.stringify(details).slice(0, 4000) : null]
    );
  } catch { /* 日志失败忽略 */ }
}

// 邮件日志: status = sent | failed
async function logEmail(to, templateCode, subject, status, error) {
  try {
    await query(
      'INSERT INTO email_logs(to_email, template_code, subject, status, error) VALUES (?,?,?,?,?)',
      [String(to || '').slice(0, 100), String(templateCode || '').slice(0, 50),
       String(subject || '').slice(0, 255), status === 'sent' ? 'sent' : 'failed',
       error ? String(error).slice(0, 2000) : null]
    );
  } catch { /* 日志失败忽略 */ }
}

module.exports = { logSystem, logEmail };