name: Retest PR

on:
  issue_comment:
    types: [created]

env:
  FORCE_JAVASCRIPT_ACTIONS_TO_NODE24: true

jobs:
  retest:
    if: github.event.issue.pull_request && contains(github.event.comment.body, 'retest')
    runs-on: ubuntu-latest
    permissions:
      actions: write
      issues: write
      pull-requests: read
    steps:
      - name: Check authorization and trigger phrase
        uses: actions/github-script@v9
        with:
          script: |
            const assoc = context.payload.comment.author_association;
            if (!['OWNER', 'MEMBER', 'COLLABORATOR'].includes(assoc)) {
              core.setFailed('Not authorized (association: ' + assoc + ')');
              return;
            }
            const body = context.payload.comment.body;
            if (!body.includes('/retest') &&
                !body.includes('[CI: retest]') &&
                !body.includes('[ci: retest]')) {
              core.setFailed('No recognized retest trigger found.');
            }

      - name: Get PR head SHA
        id: pr
        uses: actions/github-script@v9
        with:
          script: |
            const pr = (await github.rest.pulls.get({
              owner: context.repo.owner,
              repo: context.repo.repo,
              pull_number: context.issue.number,
            })).data;
            core.setOutput('sha', pr.head.sha);

      - name: Re-run CI
        uses: actions/github-script@v9
        with:
          script: |
            const runs = await github.rest.actions.listWorkflowRuns({
              owner: context.repo.owner,
              repo: context.repo.repo,
              workflow_id: 'ci.yml',
              head_sha: '${{ steps.pr.outputs.sha }}',
              per_page: 1,
            });
            if (runs.data.workflow_runs.length === 0) {
              core.setFailed('No CI run found for this PR head SHA.');
              return;
            }
            const run = runs.data.workflow_runs[0];
            if (run.status === 'completed') {
              await github.rest.actions.reRunWorkflow({
                owner: context.repo.owner,
                repo: context.repo.repo,
                run_id: run.id,
              });
            } else {
              core.info('CI is already running (status: ' + run.status + '). Nothing to re-run.');
            }