name: Update contributors

on:
  push:
    branches:
      - master
  workflow_dispatch:

permissions:
  contents: write

# Tunables ---------------------------------------------------------------
#   PINNED   : usernames to always include (e.g. co-authors the contributors
#              API does not surface).
#   EXCLUDED : usernames to always drop (bot accounts that show up as Users).
#   GitHub bots (type === "Bot") are dropped automatically.
env:
  IMAGE_SIZE: "80"
  COLUMNS: "7"
  PINNED: "chillykidd"
  EXCLUDED: "aurora-assistant"

jobs:
  update-contributors:
    runs-on: ubuntu-latest
    name: Update README contributors list
    steps:
      - uses: actions/checkout@v4

      - name: Render contributors into both READMEs
        uses: actions/github-script@v7
        with:
          script: |
            const fs = require('fs');
            const { owner, repo } = context.repo;
            const SIZE = Number(process.env.IMAGE_SIZE);
            const COLS = Number(process.env.COLUMNS);
            const PINNED = process.env.PINNED.split(',').map(s => s.trim()).filter(Boolean);
            const EXCLUDED = new Set(
              process.env.EXCLUDED.split(',').map(s => s.trim().toLowerCase()).filter(Boolean)
            );

            // All repo contributors, minus GitHub bots and excluded accounts.
            const raw = await github.paginate(github.rest.repos.listContributors, {
              owner, repo, per_page: 100,
            });
            const users = raw
              .filter(u => u.login && u.type !== 'Bot' && !EXCLUDED.has(u.login.toLowerCase()))
              .map(u => ({ login: u.login, avatar: u.avatar_url, url: u.html_url }));

            // Pin extra users (e.g. co-authors the API never returns).
            const seen = new Set(users.map(u => u.login.toLowerCase()));
            for (const login of PINNED) {
              if (seen.has(login.toLowerCase())) continue;
              const { data } = await github.rest.users.getByUsername({ username: login });
              users.push({ login: data.login, avatar: data.avatar_url, url: data.html_url });
              seen.add(login.toLowerCase());
            }

            const width = (100 / COLS).toFixed(2);
            const cell = u =>
              `<td align="center" valign="top" width="${width}%"><a href="${u.url}">` +
              `<img src="${u.avatar}&s=${SIZE * 2}" width="${SIZE}px;" alt="${u.login}"/>` +
              `<br /><sub><b>${u.login}</b></sub></a></td>`;
            let rows = '';
            for (let i = 0; i < users.length; i += COLS) {
              rows += '    <tr>\n' +
                users.slice(i, i + COLS).map(u => '      ' + cell(u)).join('\n') +
                '\n    </tr>\n';
            }
            const table = `<table>\n  <tbody>\n${rows}  </tbody>\n</table>`;

            const START = '<!-- contributors:start -->';
            const END = '<!-- contributors:end -->';
            const esc = s => s.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
            const block = new RegExp(`${esc(START)}[\\s\\S]*?${esc(END)}`);
            for (const file of ['README.md', 'README_zh.md']) {
              const before = fs.readFileSync(file, 'utf8');
              const after = before.replace(block, `${START}\n${table}\n${END}`);
              if (after !== before) fs.writeFileSync(file, after);
            }

      - name: Commit changes
        run: |
          git config user.name "github-actions[bot]"
          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
          if git diff --quiet -- README.md README_zh.md; then
            echo "No contributor changes."
          else
            git add README.md README_zh.md
            git commit -m "docs: update contributors list"
            git push
          fi