name: Close Inactive Issues

on:
  schedule:
    # run every day at midnight
    - cron: "0 0 * * *"

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

jobs:
  close_inactive_issues:
    runs-on: ubuntu-latest
    steps:
      - name: Check inactive issues and close them
        uses: actions/github-script@v6
        with:
          script: |
            const { data: issues } = await github.rest.issues.listForRepo({
              owner: context.repo.owner,
              repo: context.repo.repo,
              state: 'open',
              per_page: 100,
            });

            const now = new Date().getTime();
            const inactivePeriod = 7 * 24 * 60 * 60 * 1000; // 7 days

            for (const issue of issues) {
              // skip pull requests (they are also returned by listForRepo)
              if (issue.pull_request) continue;

              // skip labeled issues
              if (issue.labels.length > 0) {
                console.log(`Skipping issue #${issue.number} (Has labels).`);
                continue;
              }

              // fetch comments for this issue
              const { data: comments } = await github.rest.issues.listComments({
                owner: context.repo.owner,
                repo: context.repo.repo,
                issue_number: issue.number,
                per_page: 100,
              });

              // determine the "last activity" time
              let lastActivityTime;
              if (comments.length > 0) {
                const lastComment = comments[comments.length - 1];
                lastActivityTime = new Date(lastComment.updated_at).getTime();
              } else {
                lastActivityTime = new Date(issue.created_at).getTime();
              }

              // check inactivity
              if (now - lastActivityTime > inactivePeriod) {
                console.log(`Closing inactive issue: #${issue.number} (No recent replies for 7 days)`);
                await github.rest.issues.update({
                  owner: context.repo.owner,
                  repo: context.repo.repo,
                  issue_number: issue.number,
                  state: 'closed',
                });
              } else {
                console.log(`Skipping issue #${issue.number} (Active within 7 days).`);
              }
            }
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}