release-preview.yml

# Preview release info on PRs to main
name: Release Preview

on:
  pull_request:
    branches: [main]

jobs:
  preview:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      pull-requests: write

    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0
          token: ${{ secrets.GITHUB_TOKEN }}

      - name: Install uv
        uses: astral-sh/setup-uv@v4
        with:
          version: "latest"

      - name: Set up Python
        run: uv python install 3.11

      - name: Get version from pyproject.toml
        id: version
        run: |
          VERSION=$(python -c "import tomllib; print(tomllib.load(open('pyproject.toml', 'rb'))['project']['version'])")
          echo "version=$VERSION" >> $GITHUB_OUTPUT

      - name: Check if tag exists
        id: check_tag
        run: |
          if git rev-parse "v${{ steps.version.outputs.version }}" >/dev/null 2>&1; then
            echo "exists=true" >> $GITHUB_OUTPUT
          else
            echo "exists=false" >> $GITHUB_OUTPUT
          fi

      - name: Check PyPI for existing version
        id: check_pypi
        run: |
          VERSION="${{ steps.version.outputs.version }}"
          HTTP_STATUS=$(curl -s -o /dev/null -w "%{http_code}" "https://pypi.org/pypi/late-sdk/$VERSION/json")
          if [ "$HTTP_STATUS" = "200" ]; then
            echo "exists=true" >> $GITHUB_OUTPUT
          else
            echo "exists=false" >> $GITHUB_OUTPUT
          fi

      - name: Create PR Comment
        uses: actions/github-script@v7
        with:
          script: |
            const version = '${{ steps.version.outputs.version }}';
            const tagExists = '${{ steps.check_tag.outputs.exists }}' === 'true';
            const pypiExists = '${{ steps.check_pypi.outputs.exists }}' === 'true';

            let body = '## 📦 Release Preview\n\n';
            body += '| Item | Value |\n';
            body += '|------|-------|\n';
            body += `| Version | \`${version}\` |\n`;
            body += `| Git tag exists | ${tagExists ? '✅ Yes' : '❌ No'} |\n`;
            body += `| PyPI version exists | ${pypiExists ? '✅ Yes' : '❌ No'} |\n\n`;

            if (tagExists || pypiExists) {
              body += '### ⏭️ No Release\n\n';
              if (tagExists && pypiExists) {
                body += `Version \`${version}\` already exists on both GitHub and PyPI.\n\n`;
              } else if (tagExists) {
                body += `Git tag \`v${version}\` already exists.\n\n`;
              } else {
                body += `Version \`${version}\` already exists on PyPI.\n\n`;
              }
              body += '> 💡 **To create a new release**, update `version` in `pyproject.toml`\n';
            } else {
              body += '### 🚀 New Release\n\n';
              body += 'When this PR is merged, the following will happen:\n\n';
              body += `1. ✅ Create GitHub Release \`v${version}\`\n`;
              body += `2. ✅ Publish to PyPI as \`late-sdk==${version}\`\n\n`;
              body += '```bash\n';
              body += `pip install late-sdk==${version}\n`;
              body += '```\n';
            }

            // Find existing comment
            const { data: comments } = await github.rest.issues.listComments({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: context.issue.number,
            });

            const botComment = comments.find(comment =>
              comment.user.type === 'Bot' &&
              comment.body.includes('📦 Release Preview')
            );

            if (botComment) {
              await github.rest.issues.updateComment({
                owner: context.repo.owner,
                repo: context.repo.repo,
                comment_id: botComment.id,
                body: body
              });
            } else {
              await github.rest.issues.createComment({
                owner: context.repo.owner,
                repo: context.repo.repo,
                issue_number: context.issue.number,
                body: body
              });
            }