name: Auto Labeler

on:
  pull_request_target:
    types: [opened, reopened]

permissions:
  contents: read
  pull-requests: write
  issues: write

jobs:
  auto-label:
    name: Apply labels based on changed files
    runs-on: ubuntu-latest
    steps:
      - name: Apply PR Labels
        uses: https://github.com/actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9
        with:
          script: |
            const allFiles = await github.paginate(github.rest.pulls.listFiles, {
              owner: context.repo.owner,
              repo: context.repo.repo,
              pull_number: context.issue.number,
            });

            const fileNames = allFiles.map(f => f.filename);
            const labelsToAdd = new Set();

            for (const file of fileNames) {
              if (file.startsWith('docs/') || file.startsWith('theme/') || file.endsWith('.md') || file == 'rspress.config.ts') {
                labelsToAdd.add('Documentation');
              }
              if (file.startsWith('.forgejo/')) {
                labelsToAdd.add('Meta/CI');
              }
              if (file.startsWith('pkg/') || file.startsWith('nix/') || file === 'flake.nix' || file === 'flake.lock' || file.startsWith('docker/')) {
                labelsToAdd.add('Meta/Packaging');
              }
            }

            if (labelsToAdd.size > 0) {
              const labelsArray = Array.from(labelsToAdd);
              console.log('Adding labels:', labelsArray);
              await github.rest.issues.addLabels({
                owner: context.repo.owner,
                repo: context.repo.repo,
                issue_number: context.issue.number,
                labels: labelsArray,
              });
            } else {
              console.log('No files changed that require auto-labeling.');
            }