name: Awaiting Response Label Sync

on:
  # Fires when the PR author pushes new commits
  pull_request_target:
    types: [synchronize]
  # Fires when someone comments on a PR (also fires for plain issues, filtered out below)
  issue_comment:
    types: [created]

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

jobs:
  sync-label:
    # issue_comment fires for issues too, so only run it for PR comments
    if: >-
      github.event_name != 'issue_comment' ||
      github.event.issue.pull_request != null
    runs-on: ubuntu-latest
    steps:
      - name: Clear "awaiting response" label on author response
        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 #v9.0.0
        env:
          AWAITING_LABEL: 'awaiting response'
        with:
          script: |
            const awaitingLabel = process.env.AWAITING_LABEL;
            // Resolve the PR number for whichever event triggered this run
            const prNumber = context.eventName === 'issue_comment'
              ? context.payload.issue.number
              : context.payload.pull_request.number;
            const { owner, repo } = context.repo;

            // Check whether the label is already on the PR, so we don't try to
            // remove something that isn't there
            const { data: issue } = await github.rest.issues.get({
              owner, repo, issue_number: prNumber,
            });
            const hasLabel = issue.labels.some(l =>
              (typeof l === 'string' ? l : l.name) === awaitingLabel
            );

            if (!hasLabel) {
              core.info('Label not present; nothing to do.');
              return;
            }

            // The author pushed new commits -> treat that as their response and clear the label
            const authorPushed = context.eventName === 'pull_request_target' && context.payload.action === 'synchronize';
            // The PR author left a comment -> treat any reply from them as a response too
            const authorCommented = context.eventName === 'issue_comment' && context.payload.comment.user.login === context.payload.issue.user.login;

            if (authorPushed || authorCommented) {
              // If the label was already gone for some reason, that's fine, not an error
              await github.rest.issues.removeLabel({
                owner, repo, issue_number: prNumber, name: awaitingLabel,
              }).catch(e => core.warning(`removeLabel failed: ${e.message}`));
              core.info(`Removed "${awaitingLabel}".`);
            } else {
              core.info('Event does not require a label change.');
            }