name: 'Label Workstream Rollup'

on:
  issues:
    types: ['opened', 'edited', 'reopened']
  schedule:
    - cron: '0 * * * *'
  workflow_dispatch:

jobs:
  labeler:
    runs-on: 'ubuntu-latest'
    permissions:
      issues: 'write'
    steps:
      - name: 'Check for Parent Workstream and Apply Label'
        uses: 'actions/github-script@v7'
        with:
          script: |
            const labelToAdd = 'workstream-rollup';

            // Allow-list of parent issue URLs
            const allowedParentUrls = [
              'https://github.com/google-gemini/gemini-cli/issues/15374',
              'https://github.com/google-gemini/gemini-cli/issues/15456',
              'https://github.com/google-gemini/gemini-cli/issues/15324'
            ];

            async function getIssueParent(owner, repo, number) {
              const query = `
                query($owner:String!, $repo:String!, $number:Int!) {
                  repository(owner:$owner, name:$repo) {
                    issue(number:$number) {
                      parent {
                        url
                      }
                    }
                  }
                }
              `;
              try {
                const result = await github.graphql(query, { owner, repo, number });
                return result.repository.issue.parent ? result.repository.issue.parent.url : null;
              } catch (error) {
                console.error(`Failed to fetch parent for #${number}:`, error);
                return null;
              }
            }

            // Determine which issues to process
            let issuesToProcess = [];

            if (context.eventName === 'issues') {
               // Context payload for 'issues' event already has the issue object
               issuesToProcess.push({
                 number: context.payload.issue.number,
                 owner: context.repo.owner,
                 repo: context.repo.repo
               });
            } else {
              // For schedule/dispatch, fetch open issues (lightweight list)
              console.log(`Running for event: ${context.eventName}. Fetching open issues...`);
              const openIssues = await github.paginate(github.rest.issues.listForRepo, {
                owner: context.repo.owner,
                repo: context.repo.repo,
                state: 'open'
              });
              issuesToProcess = openIssues.map(i => ({
                number: i.number,
                owner: context.repo.owner,
                repo: context.repo.repo
              }));
            }

            console.log(`Processing ${issuesToProcess.length} issue(s)...`);

            for (const issue of issuesToProcess) {
              const parentUrl = await getIssueParent(issue.owner, issue.repo, issue.number);

              if (parentUrl && allowedParentUrls.includes(parentUrl)) {
                console.log(`SUCCESS: Issue #${issue.number} is a direct child of ${parentUrl}. Adding label.`);
                await github.rest.issues.addLabels({
                  owner: issue.owner,
                  repo: issue.repo,
                  issue_number: issue.number,
                  labels: [labelToAdd]
                });
              } else {
                 // logging only for single execution to avoid spam
                 if (context.eventName === 'issues') {
                    console.log(`Issue #${issue.number} parent is ${parentUrl || 'None'}. No action.`);
                 }
              }
            }