name: Vouch Check

on:
  pull_request_target:
    types: [opened, reopened]

permissions:
  contents: read
  pull-requests: write

jobs:
  vouch-gate:
    if: github.repository_owner == 'NVIDIA'
    runs-on: ubuntu-latest
    env:
      ORG_READ_TOKEN: ${{ secrets.ORG_READ_TOKEN }}
    steps:
      - name: Check org membership
        id: org-check
        if: env.ORG_READ_TOKEN != ''
        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9
        with:
          github-token: ${{ secrets.ORG_READ_TOKEN }}
          result-encoding: string
          script: |
            const author = context.payload.pull_request.user.login;
            try {
              const { status } = await github.rest.orgs.checkMembershipForUser({
                org: context.repo.owner,
                username: author,
              });
              if (status === 204 || status === 302) {
                console.log(`${author} is an org member. Skipping vouch check.`);
                return 'skip';
              }
            } catch (e) {
              if (e.status !== 404) {
                console.log(`Org membership check error (status=${e.status}): ${e.message}`);
              }
            }
            return '';

      - name: Check if contributor is vouched
        if: steps.org-check.outputs.result != 'skip'
        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9
        with:
          script: |
            const author = context.payload.pull_request.user.login;
            const authorType = context.payload.pull_request.user.type;

            // Skip bots (dependabot, renovate, github-actions, etc.).
            if (authorType === 'Bot') {
              console.log(`${author} is a bot. Skipping vouch check.`);
              return;
            }

            // Check the VOUCHED.td file on the dedicated "vouched" branch.
            // NOT the PR branch — the PR author could add themselves in their fork.
            let vouched = false;
            try {
              const { data } = await github.rest.repos.getContent({
                owner: context.repo.owner,
                repo: context.repo.repo,
                path: '.github/VOUCHED.td',
                ref: 'vouched',
              });
              const content = Buffer.from(data.content, 'base64').toString('utf-8');
              const usernames = content
                .split('\n')
                .map(line => line.trim())
                .filter(line => line && !line.startsWith('#') && !line.startsWith('-'));
              vouched = usernames.some(
                name => name.toLowerCase() === author.toLowerCase()
              );
            } catch (e) {
              console.log(`Could not read VOUCHED.td: ${e.message}`);
            }

            if (vouched) {
              console.log(`${author} is in VOUCHED.td. Approved.`);
              return;
            }

            // Not vouched — close the PR with an explanation.
            console.log(`${author} is not vouched. Closing PR.`);

            await github.rest.issues.createComment({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: context.payload.pull_request.number,
              body: [
                `Thank you for your interest in contributing to OpenShell, @${author}.`,
                '',
                'This project uses a **vouch system** for first-time contributors. Before submitting a pull request, you need to be vouched by a maintainer.',
                '',
                '**To get vouched:**',
                '1. Open a [Vouch Request](https://github.com/NVIDIA/OpenShell/discussions/new?category=vouch-request) discussion.',
                '2. Describe what you want to change and why.',
                '3. Write in your own words — do not have an AI generate the request.',
                '4. A maintainer will comment `/vouch` if approved.',
                '5. Once vouched, open a new PR (preferred) or reopen this one after a few minutes.',
                '',
                'See [CONTRIBUTING.md](https://github.com/NVIDIA/OpenShell/blob/main/CONTRIBUTING.md#first-time-contributors) for details.',
              ].join('\n'),
            });

            await github.rest.pulls.update({
              owner: context.repo.owner,
              repo: context.repo.repo,
              pull_number: context.payload.pull_request.number,
              state: 'closed',
            });