name: Check stdlib_flags.h modifications

on:
  pull_request:
    types: [opened, synchronize, reopened, labeled, unlabeled]

jobs:
  check-stdlib-flags:
    runs-on: ubuntu-latest
    steps:
      - name: Check if stdlib_flags.h was modified
        uses: actions/github-script@v8
        with:
          script: |
            // Get the list of files changed in this PR
            const files = await github.paginate(
              github.rest.pulls.listFiles,
              {
                owner: context.repo.owner,
                repo: context.repo.repo,
                pull_number: context.payload.pull_request.number,
              }
            );

            // Check if stdlib_flags.h was modified
            const stdlibFlagsModified = files.some(file =>
              file.filename === 'src/stdlib_flags.h'
            );

            if (stdlibFlagsModified) {
              console.log('src/stdlib_flags.h was modified in this PR');

              // Check if the unlock label is present

              const { data: pr } = await github.rest.pulls.get({
                owner: context.repo.owner,
                repo: context.repo.repo,
                pull_number: context.issue.number,
              });

              const hasUnlockLabel = pr.labels.some(label =>
                label.name === 'unlock-upstream-stdlib-flags'
              );

              if (!hasUnlockLabel) {
                core.setFailed(
                  'src/stdlib_flags.h was modified. This is likely a mistake. If you would like to change ' +
                  'bootstrapping settings or request a stage0 update, you should modify stage0/src/stdlib_flags.h. ' +
                  'If you really want to change src/stdlib_flags.h (which should be extremely rare), set the ' +
                  'unlock-upstream-stdlib-flags label.'
                );
              } else {
                console.log('Found unlock-upstream-stdlib-flags');
              }
            } else {
              console.log('src/stdlib_flags.h was not modified');
            }