name: Auto-assign PR

on:
  pull_request:
    types: [opened, reopened, ready_for_review]

permissions:
  pull-requests: write

jobs:
  auto-assign:
    runs-on: ubuntu-latest
    steps:
      - name: Assign random reviewer
        uses: actions/github-script@v8
        with:
          script: |
            const pr = context.payload.pull_request;

            if (pr.draft) {
              core.info('Skipping: PR is a draft.');
              return;
            }

            if (pr.assignees && pr.assignees.length > 0) {
              core.info(`Skipping: PR already has assignee(s): ${pr.assignees.map(a => a.login).join(', ')}`);
              return;
            }

            const members = ['aktemur', 'amd-shahab', 'czidev-amd', 'lancesix', 'lumachad'];
            const candidates = members.filter(login => login !== pr.user.login);

            if (candidates.length === 0) {
              core.warning('No eligible assignees after excluding PR author.');
              return;
            }

            const assignee = candidates[Math.floor(Math.random() * candidates.length)];
            core.info(`Assigning PR #${pr.number} to ${assignee} (from ${candidates.length} candidate(s))`);

            await github.rest.issues.addAssignees({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: pr.number,
              assignees: [assignee]
            });