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

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

/**
 * 取得 PR 的 Git Diff 內容，已自動排除 .gitea/ 資料夾。
 */
export async function getPRDiff() {
  const resp = await axios.get(api(`/repos/${GITEA_REPOSITORY}/pulls/${PR_NUMBER}.diff`), { headers: headers(), timeout: 60000, httpsAgent });
  return filterDiff(resp.data, ['.gitea/', '.amazonq/', '.claude/', '.codex/', '.gemini/', '.github/', 'CLAUDE.md', 'GEMINI.md', 'TODO.md', 'README.md']);
}

/**
 * 過濾 diff 內容，移除路徑符合 excludePrefixes 的區塊。
 * 每個區塊以 "diff --git a/<prefix>" 開頭判斷，使用 startsWith 精確比對前綴。
 */
export function filterDiff(diff, excludePrefixes) {
  return diff.split(/(?=^diff --git )/m)
    .filter(block => !excludePrefixes.some(p => {
      const prefix = `diff --git a/${p}`;
      const singleFile = `diff --git a/${p} b/${p}`;
      return block.startsWith(prefix) || block.startsWith(singleFile);
    }))
    .join('');
}

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;
}