name: Auto-merge showcase PRs

on:
  pull_request:
    branches: [main]
    paths:
      - "examples/showcases/**"

permissions:
  contents: write
  pull-requests: write

jobs:
  auto-merge:
    runs-on: ubuntu-latest
    steps:
      - name: Check author is on Demo team
        id: check-team
        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9
        with:
          # Authorize on the PR AUTHOR (immutable for the lifetime of the PR),
          # never `context.actor` — `actor` is whoever triggered the most
          # recent event, so a team member synchronizing or reopening an
          # outsider's PR would otherwise green-light auto-merge of code
          # they didn't author.
          script: |
            const prAuthor = context.payload.pull_request.user.login;
            try {
              await github.rest.teams.getMembershipForUserInOrg({
                org: 'CopilotKit',
                team_slug: 'demo',
                username: prAuthor,
              });
              core.setOutput('is_demo', 'true');
            } catch {
              core.info(`${prAuthor} is not a member of CopilotKit/demo`);
              core.setOutput('is_demo', 'false');
            }

      - name: Check PR only touches showcases
        if: steps.check-team.outputs.is_demo == 'true'
        id: check-files
        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9
        with:
          script: |
            const { data: files } = await github.rest.pulls.listFiles({
              owner: context.repo.owner,
              repo: context.repo.repo,
              pull_number: context.payload.pull_request.number,
              per_page: 100,
            });

            const allShowcases = files.every(f =>
              f.filename.startsWith('examples/showcases/')
            );

            if (!allShowcases) {
              const outside = files
                .filter(f => !f.filename.startsWith('examples/showcases/'))
                .map(f => f.filename);
              core.info(`Files outside showcases: ${outside.join(', ')}`);
            }

            core.setOutput('only_showcases', allShowcases.toString());

      - name: Approve PR
        if: steps.check-team.outputs.is_demo == 'true' && steps.check-files.outputs.only_showcases == 'true'
        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9
        with:
          script: |
            await github.rest.pulls.createReview({
              owner: context.repo.owner,
              repo: context.repo.repo,
              pull_number: context.payload.pull_request.number,
              event: 'APPROVE',
              body: 'Auto-approved: showcase-only changes from CopilotKit/demo team member.',
            });

      - name: Enable auto-merge
        if: steps.check-team.outputs.is_demo == 'true' && steps.check-files.outputs.only_showcases == 'true'
        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9
        with:
          script: |
            await github.graphql(`
              mutation($prId: ID!) {
                enablePullRequestAutoMerge(input: {
                  pullRequestId: $prId,
                  mergeMethod: MERGE
                }) {
                  clientMutationId
                }
              }
            `, { prId: context.payload.pull_request.node_id });