import axios from 'axios';
import https from 'https';
import { GITEA_TOKEN, GITEA_SERVER_URL, GITEA_REPOSITORY, PR_NUMBER, PR_HEAD_BRANCH } from './config.js';

const httpsAgent = new https.Agent({ rejectUnauthorized: false });
const headers = () => ({ Authorization: `token ${GITEA_TOKEN}`, 'Content-Type': 'application/json' });
const api = (path) => `${GITEA_SERVER_URL.replace(/\/$/, '')}/api/v1${path}`;

export async function getPRDiff() {
  const resp = await axios.get(api(`/repos/${GITEA_REPOSITORY}/pulls/${PR_NUMBER}.diff`), { headers: headers(), timeout: 60000, httpsAgent });
  return resp.data;
}

export async function postComment(body) {
  const resp = await axios.post(api(`/repos/${GITEA_REPOSITORY}/issues/${PR_NUMBER}/comments`), { body }, { headers: headers(), timeout: 30000, httpsAgent });
  return resp.data;
}

/**
 * 透過 Gitea API 建立或更新檔案（不需要 git binary）
 */
export async function commitFile(filePath, content, message) {
  const encoded = Buffer.from(content).toString('base64');
  const url = api(`/repos/${GITEA_REPOSITORY}/contents/${filePath}`);

  // 先嘗試取得現有檔案的 SHA
  let sha;
  try {
    const existing = await axios.get(`${url}?ref=${PR_HEAD_BRANCH}`, { headers: headers(), httpsAgent, timeout: 15000 });
    sha = existing.data.sha;
    console.log(`  [debug] 取得現有檔案 SHA=${sha}`);
  } catch (e) {
    console.log(`  [debug] 檔案不存在，將建立新檔案: ${e.response?.status || e.message}`);
    sha = undefined;
  }

  const payload = {
    message,
    content: encoded,
    branch: PR_HEAD_BRANCH,
    ...(sha ? { sha } : {}),
  };

  console.log(`  [debug] ${sha ? 'PUT' : 'POST'} ${url} branch=${PR_HEAD_BRANCH}`);
  const resp = await axios.request({
    method: sha ? 'put' : 'post',
    url,
    headers: headers(),
    httpsAgent,
    timeout: 30000,
    data: payload,
  });
  return resp.data;
}