name: Sync with shadow repo

on:
  push:
  create:
  delete:
  pull_request:
    types: [opened]

concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}-${{ github.event_name }}
  cancel-in-progress: true

jobs:
  sync-branch:
    name: Create/delete shadow branch
    runs-on: ubuntu-latest
    if: github.event.ref_type == 'branch'
    steps:
      - name: Clone shadow repo
        uses: actions/checkout@v3
        with:
          repository: ${{ vars.SHADOW_OWNER }}/${{ vars.SHADOW_REPO }}
          ssh-key: ${{ secrets.SHADOW_REPO_PRIVATE_KEY }}
          ref: main
      - name: Create branch on shadow repo
        if: github.event_name == 'create'
        run: git push origin main:${{ github.event.ref }}
      - name: Delete branch on shadow repo
        if: github.event_name == 'delete'
        run: git push origin --delete ${{ github.event.ref }}

  push-branch:
    name: Push to shadow branch
    runs-on: ubuntu-latest
    if: github.event_name == 'push'
    steps:
      - uses: actions/checkout@v3
      - uses: actions/setup-node@v3
        with:
          node-version-file: .nvmrc
          cache: yarn
      - run: yarn install
      - run: yarn build-prod
      - name: Clone shadow repo
        uses: actions/checkout@v3
        with:
          repository: ${{ vars.SHADOW_OWNER }}/${{ vars.SHADOW_REPO }}
          ssh-key: ${{ secrets.SHADOW_REPO_PRIVATE_KEY }}
          ref: ${{ github.ref_name }}
          path: shadow-repo
      - name: Push to shadow branch
        run: |
          cd shadow-repo
          rm -rf ./*
          cp -rT ../_site .
          git config user.name github-actions
          git config user.email github-actions@github.com
          git add -A
          git commit --allow-empty -m "Update from https://github.com/${{ github.repository }}/commit/${{ github.sha }}"
          git push origin

  diff-link:
    name: Create comment to diff link
    runs-on: ubuntu-latest
    if: github.event_name == 'pull_request' && github.event.action == 'opened'
    steps:
      - uses: peter-evans/create-or-update-comment@v2
        with:
          issue-number: ${{ github.event.number }}
          body: |
            View diff of compiled files (may take a few minutes): https://github.com/${{ vars.SHADOW_OWNER }}/${{ vars.SHADOW_REPO }}/compare/${{ github.event.pull_request.base.ref }}..${{ github.event.pull_request.head.ref }}