name: Approve Merged Contributor

on:
  pull_request_target:
    types: [closed]

jobs:
  approve:
    if: ${{ github.event.pull_request.merged == true }}
    runs-on: ubuntu-latest
    permissions:
      contents: write
      pull-requests: read
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          ref: ${{ github.event.repository.default_branch }}

      - name: Add merged contributor to approved list
        id: update
        uses: actions/github-script@v7
        with:
          script: |
            const fs = require('fs');

            const prAuthor = context.payload.pull_request.user.login;
            const approvedFile = '.github/APPROVED_CONTRIBUTORS';

            if (prAuthor.endsWith('[bot]') || prAuthor === 'dependabot[bot]') {
              console.log(`Skipping bot: ${prAuthor}`);
              core.setOutput('status', 'skipped');
              return;
            }

            let content = fs.readFileSync(approvedFile, 'utf8');
            const approvedList = content
              .split('\n')
              .map(line => line.trim().toLowerCase())
              .filter(line => line && !line.startsWith('#'));

            if (approvedList.includes(prAuthor.toLowerCase())) {
              console.log(`${prAuthor} is already approved`);
              core.setOutput('status', 'already');
              return;
            }

            content = content.trimEnd() + '\n' + prAuthor + '\n';
            fs.writeFileSync(approvedFile, content);

            console.log(`Added ${prAuthor} to approved contributors`);
            core.setOutput('status', 'added');

      - name: Commit and push
        if: steps.update.outputs.status == 'added'
        run: |
          git config user.name "github-actions[bot]"
          git config user.email "github-actions[bot]@users.noreply.github.com"
          git add .github/APPROVED_CONTRIBUTORS
          git diff --staged --quiet || git commit -m "chore: approve merged contributor ${{ github.event.pull_request.user.login }}"
          git push