preview.yaml

name: Preview generated SDK vs main

on:
  pull_request:
    paths:
      - "sdk-generator/**"
      - "package-lock.json"
  workflow_dispatch:

jobs:
  generate-and-diff:
    name: Generate SDK and diff vs main
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: read
      pull-requests: write

    steps:
      - name: Checkout current ref
        uses: actions/checkout@v4

      - name: Checkout main
        uses: actions/checkout@v4
        with:
          repository: ${{ github.repository }}
          ref: main
          path: main-sdk

      - name: Setup Node.js
        uses: actions/setup-node@v4
        with:
          node-version: "24"
          cache: "npm"
          registry-url: "https://npm.pkg.github.com/"
          scope: "@rebilly"
          cache-dependency-path: |
            package-lock.json

      - name: Login to GitHub Registry
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ github.token }}

      - name: Install dependencies
        run: npm ci
        env:
          NODE_AUTH_TOKEN: ${{ secrets.GITHUB_TOKEN }}

      - name: Build PHP SDK
        run: |
          mkdir -p /tmp/sdk
          npm run generate /tmp/sdk https://www.rebilly.com/_spec/catalog/all.yaml
          cp -r examples /tmp/sdk

      - name: Generate diff (generated SDK vs main)
        id: text-diff
        working-directory: main-sdk
        run: |
          # Replace main's SDK files with generated ones, then diff
          rm -rf src composer.json .php-cs-fixer.php psalm.xml 2>/dev/null || true
          cp -r /tmp/sdk/src .
          cp /tmp/sdk/composer.json . 2>/dev/null || true
          cp /tmp/sdk/psalm.xml . 2>/dev/null || true
          cp /tmp/sdk/.php-cs-fixer.php . 2>/dev/null || true

          # Add all files to git to ensure diff works correctly
          git add -A || true

          # Generate text diff (staged = generated vs main's content)
          git diff --no-color --cached > /tmp/rebilly-sdk-diff.txt || true

          # Check diff size (GitHub PR comment limit is ~65,536 characters)
          DIFF_SIZE=$(wc -c < /tmp/rebilly-sdk-diff.txt)
          echo "diff_size=$DIFF_SIZE" >> $GITHUB_OUTPUT
          echo "Diff size: $DIFF_SIZE bytes"

          if [ "$DIFF_SIZE" -gt 0 ] && [ "$DIFF_SIZE" -lt 60000 ]; then
            echo "include_diff=true" >> $GITHUB_OUTPUT
          else
            echo "include_diff=false" >> $GITHUB_OUTPUT
          fi
          if [ "$DIFF_SIZE" -eq 0 ]; then
            echo "diff_empty=true" >> $GITHUB_OUTPUT
          else
            echo "diff_empty=false" >> $GITHUB_OUTPUT
          fi

      - name: Generate HTML diff
        working-directory: main-sdk
        run: |
          npx -y diff2html-cli -s side -t 'Rebilly PHP SDK' -F /tmp/rebilly-sdk-diff.html

      - name: Upload Artifact
        id: diff-upload
        uses: actions/upload-artifact@v4
        with:
          name: rebilly-sdk-diff
          path: /tmp/rebilly-sdk-diff.html
          retention-days: 3
          if-no-files-found: ignore


      - name: Prepare PR Comment Message
        if: github.event_name == 'pull_request'
        id: comment-message
        run: |
          echo "## 🔍 PHP SDK Changes Preview" >> /tmp/pr-comment.md
          echo "" >> /tmp/pr-comment.md
          if [ "${{ steps.text-diff.outputs.include_diff }}" == "true" ]; then
            {
              echo '```diff'
              cat /tmp/rebilly-sdk-diff.txt
              echo '```'
            } >> /tmp/pr-comment.md
          else
            echo "**Diff is too large to display inline**" >> /tmp/pr-comment.md
          fi
          echo "" >> /tmp/pr-comment.md
          echo "📦 Download the **rebilly-sdk-diff** artifact from the [workflow run](${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}) for a formatted HTML diff." >> /tmp/pr-comment.md
          echo "" >> /tmp/pr-comment.md
          echo "---" >> /tmp/pr-comment.md
          echo "**Updated:** $(date -u +"%Y-%m-%d %H:%M:%S UTC")" >> /tmp/pr-comment.md
          echo "**Commit:** [${{ github.event.pull_request.head.sha }}](${{ github.server_url }}/${{ github.repository }}/commit/${{ github.event.pull_request.head.sha }})" >> /tmp/pr-comment.md

          {
            echo "message<<EOF"
            cat /tmp/pr-comment.md
            echo "EOF"
          } >> $GITHUB_OUTPUT

      - name: Create/Update PR Comment
        if: github.event_name == 'pull_request'
        uses: marocchino/sticky-pull-request-comment@v2
        with:
          GITHUB_TOKEN: ${{ github.token }}
          number: ${{ github.event.pull_request.number }}
          message: ${{ steps.comment-message.outputs.message }}