// DeepSeek API 客户端
const DEEPSEEK_API_KEY = process.env.DEEPSEEK_API_KEY || '';

function sanitizeUserId(username) {
  return username.replace(/[^a-zA-Z0-9\-_]/g, '_').substring(0, 64) || 'anon';
}

async function callDeepSeek(messages, temperature = 0.1, userId = '') {
  console.log('🤖 调用 DeepSeek...');
  var body = { model: 'deepseek-v4-flash', messages: messages, temperature: temperature, stream: false };
  if (userId) body.user_id = sanitizeUserId(userId);
  var res = await fetch('https://api.deepseek.com/chat/completions', {
    method: 'POST',
    headers: { 'Content-Type': 'application/json', 'Authorization': 'Bearer ' + DEEPSEEK_API_KEY },
    body: JSON.stringify(body)
  });
  const data = await res.json();
  if (!data.choices || !data.choices[0]) {
    console.error('🤖 DeepSeek 返回异常:', JSON.stringify(data));
    throw new Error('DeepSeek API 返回异常: ' + (data.error?.message || JSON.stringify(data)));
  }
  return data.choices[0].message.content;
}

module.exports = { callDeepSeek };