name: Auto Unassign

on:
  schedule:
    - cron: "0 0 * * *" # Run at 00:00 every day

permissions:
  issues: write # Need write permission to modify issue assignees

jobs:
  unassign_job:
    runs-on: ubuntu-latest
    steps:
      - name: Unassign inactive issues
        uses: actions/github-script@v6
        with:
          script: |
            const daysBeforeUnassign = 14; 
            let page = 1;
            const perPage = 100;

            while (true) {
              const { data: issues } = await github.rest.issues.listForRepo({
                owner: context.repo.owner,
                repo: context.repo.repo,
                state: 'open',
                assignee: '*', // Filter assigned issues
                per_page: perPage,
                page: page,
              });

              if (issues.length === 0) {
                break;
              }

              const now = new Date();

              for (const issue of issues) {
                if (issue.pull_request) continue;

                const updatedAt = new Date(issue.updated_at);
                const daysInactive = (now - updatedAt) / (1000 * 60 * 60 * 24);

                const { data: timeline } = await github.rest.issues.listEventsForTimeline({
                  owner: context.repo.owner,
                  repo: context.repo.repo,
                  issue_number: issue.number,
                });

                const hasLinkedPR = timeline.some(event => 
                  event.event === 'cross-referenced' && event.source?.issue?.pull_request || // PR referenced this issue
                  event.event === 'connected' || // PR connected via keywords
                  event.event === 'referenced' && event.commit_id // Connected via commit
                );

                if (daysInactive >= daysBeforeUnassign && !hasLinkedPR) {
                  const assigneesMentions = issue.assignees
                    .map(user => `@${user.login}`)
                    .join(' ');
                    
                  // Remove assignees
                  await github.rest.issues.removeAssignees({
                    owner: context.repo.owner,
                    repo: context.repo.repo,
                    issue_number: issue.number,
                    assignees: issue.assignees.map(user => user.login),
                  });

                  await github.rest.issues.createComment({
                    owner: context.repo.owner,
                    repo: context.repo.repo,
                    issue_number: issue.number,
                    body: `${assigneesMentions} Assignees have been automatically removed since no PR was linked to this issue within 14 days. Please contact maintainers for reassignment if you wish to continue working on this issue.`,
                  });
                }
              }

              page += 1;
            }