name: Append API Node PR template

on:
  pull_request_target:
    types: [opened, reopened, synchronize, ready_for_review]
    paths:
      - 'comfy_api_nodes/**'   # only run if these files changed

permissions:
  contents: read
  pull-requests: write

jobs:
  inject:
    runs-on: ubuntu-latest
    steps:
      - name: Ensure template exists and append to PR body
        uses: actions/github-script@v7
        with:
          script: |
            const { owner, repo } = context.repo;
            const number = context.payload.pull_request.number;
            const templatePath = '.github/PULL_REQUEST_TEMPLATE/api-node.md';
            const marker = '<!-- API_NODE_PR_CHECKLIST: do not remove -->';

            const { data: pr } = await github.rest.pulls.get({ owner, repo, pull_number: number });

            let templateText;
            try {
              const res = await github.rest.repos.getContent({
                owner,
                repo,
                path: templatePath,
                ref: pr.base.ref
              });
              const buf = Buffer.from(res.data.content, res.data.encoding || 'base64');
              templateText = buf.toString('utf8');
            } catch (e) {
              core.setFailed(`Required PR template not found at "${templatePath}" on ${pr.base.ref}. Please add it to the repo.`);
              return;
            }

            // Enforce the presence of the marker inside the template (for idempotence)
            if (!templateText.includes(marker)) {
              core.setFailed(`Template at "${templatePath}" does not contain the required marker:\n${marker}\nAdd it so we can detect duplicates safely.`);
              return;
            }

            // If the PR already contains the marker, do not append again.
            const body = pr.body || '';
            if (body.includes(marker)) {
              core.info('Template already present in PR body; nothing to inject.');
              return;
            }

            const newBody = (body ? body + '\n\n' : '') + templateText + '\n';
            await github.rest.pulls.update({ owner, repo, pull_number: number, body: newBody });
            core.notice('API Node template appended to PR description.');