deploy-demo.yml

name: Deploy Demo

on:
  push:
    branches: [main]
  pull_request:
    types: [opened, synchronize, reopened, closed]
  workflow_dispatch:

permissions:
  contents: write
  pull-requests: write
  pages: write
  id-token: write

concurrency:
  group: 'pages-${{ github.event.pull_request.number || github.ref }}'
  cancel-in-progress: true

jobs:
  build:
    if: github.event.action != 'closed'
    runs-on: ubuntu-latest
    outputs:
      preview_url: ${{ steps.set-url.outputs.url }}
    steps:
      - name: Checkout code
        uses: actions/checkout@v4

      - name: Setup Node.js
        uses: actions/setup-node@v4
        with:
          node-version: '22'
          cache: 'yarn'

      - name: Install dependencies
        run: yarn install --frozen-lockfile

      - name: Determine base path
        id: base-path
        run: |
          if [ "${{ github.event_name }}" = "pull_request" ]; then
            echo "path=/flagsmith-backstage-plugin/pr-${{ github.event.pull_request.number }}/" >> $GITHUB_OUTPUT
          else
            echo "path=/flagsmith-backstage-plugin/" >> $GITHUB_OUTPUT
          fi

      - name: Build demo
        run: yarn build:demo
        env:
          VITE_BASE_PATH: ${{ steps.base-path.outputs.path }}

      - name: Set preview URL
        id: set-url
        run: |
          if [ "${{ github.event_name }}" = "pull_request" ]; then
            echo "url=https://${{ github.repository_owner }}.github.io/flagsmith-backstage-plugin/pr-${{ github.event.pull_request.number }}/" >> $GITHUB_OUTPUT
          fi

      - name: Upload artifact
        uses: actions/upload-artifact@v4
        with:
          name: demo-build
          path: ./dist-demo

  deploy-main:
    if: github.event_name == 'push' && github.ref == 'refs/heads/main'
    needs: build
    runs-on: ubuntu-latest
    environment:
      name: github-pages
      url: ${{ steps.deployment.outputs.page_url }}
    steps:
      - name: Download artifact
        uses: actions/download-artifact@v4
        with:
          name: demo-build
          path: ./dist-demo

      - name: Setup Pages
        uses: actions/configure-pages@v4

      - name: Upload to Pages
        uses: actions/upload-pages-artifact@v3
        with:
          path: ./dist-demo

      - name: Deploy to GitHub Pages
        id: deployment
        uses: actions/deploy-pages@v4

  deploy-pr-preview:
    if: github.event_name == 'pull_request' && github.event.action != 'closed'
    needs: build
    runs-on: ubuntu-latest
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Download artifact
        uses: actions/download-artifact@v4
        with:
          name: demo-build
          path: ./dist-demo

      - name: Deploy PR preview
        run: |
          git config user.name "github-actions[bot]"
          git config user.email "github-actions[bot]@users.noreply.github.com"

          # Move artifact to temp location before switching branches
          mv dist-demo /tmp/dist-demo

          # Check if gh-pages branch exists
          if git ls-remote --heads origin gh-pages | grep -q gh-pages; then
            git fetch origin gh-pages
            git checkout gh-pages
          else
            # Create orphan gh-pages branch if it doesn't exist
            git checkout --orphan gh-pages
            git rm -rf .
            echo "# GitHub Pages" > README.md
            git add README.md
            git commit -m "Initialize gh-pages branch"
          fi

          # Deploy PR preview
          PR_DIR="pr-${{ github.event.pull_request.number }}"
          rm -rf "$PR_DIR"
          mkdir -p "$PR_DIR"
          cp -r /tmp/dist-demo/* "$PR_DIR/"

          git add .
          git diff --staged --quiet || git commit -m "Deploy PR #${{ github.event.pull_request.number }} preview"
          git push origin gh-pages

      - name: Comment on PR
        uses: actions/github-script@v7
        with:
          script: |
            const url = '${{ needs.build.outputs.preview_url }}';
            const body = `## Demo Preview

            Preview URL: ${url}

            This preview will be automatically cleaned up when the PR is closed.`;

            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(c =>
              c.user.type === 'Bot' && c.body.includes('Demo Preview')
            );

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

  cleanup-pr-preview:
    if: github.event_name == 'pull_request' && github.event.action == 'closed'
    runs-on: ubuntu-latest
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Remove PR preview
        run: |
          # Check if gh-pages branch exists
          if ! git ls-remote --heads origin gh-pages | grep -q gh-pages; then
            echo "gh-pages branch does not exist, nothing to clean up"
            exit 0
          fi

          git config user.name "github-actions[bot]"
          git config user.email "github-actions[bot]@users.noreply.github.com"
          git fetch origin gh-pages
          git checkout gh-pages

          PR_DIR="pr-${{ github.event.pull_request.number }}"
          if [ -d "$PR_DIR" ]; then
            rm -rf "$PR_DIR"
            git add .
            git diff --staged --quiet || git commit -m "Remove PR #${{ github.event.pull_request.number }} preview"
            git push origin gh-pages
          fi