name: Upgrade dependencies

on:
  workflow_dispatch: # Allow running on-demand
  schedule:
    # Every Monday at 8:00 UTC (4:00 Eastern)
    - cron: '0 8 * * 1'

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

jobs:
  upgrade:
    name: Upgrade & Open Pull Request
    runs-on: ubuntu-latest
    env:
      BRANCH_NAME: auto-dependency-upgrades
    steps:
      - uses: actions/checkout@v3
        with:
          # Use a separate key so the resulting PR also runs GH Actions
          # https://github.com/peter-evans/create-pull-request/blob/main/docs/concepts-guidelines.md#triggering-further-workflow-runs
          ssh-key: ${{ secrets.DEPLOY_KEY }}
      - uses: actions/setup-node@v3
        with:
          node-version-file: .nvmrc
          cache: yarn
      - name: Upgrade dependencies
        run: |
          rm -f yarn.lock
          npx --yes yarn-upgrade-all
      - name: Build
        run: yarn build
      - name: Detect changes
        id: changes
        run: echo "count=$(git status --porcelain=v1 2>/dev/null | wc -l)" >> $GITHUB_OUTPUT
      - name: Commit & push changes
        if: steps.changes.outputs.count > 0
        run: |
          git config user.name github-actions
          git config user.email github-actions@github.com
          git add .
          git commit -m "chore(deps): Automated dependency upgrades"
          git push -f origin ${{ github.ref_name }}:$BRANCH_NAME
      - name: Open pull request if needed
        if: steps.changes.outputs.count > 0
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          PR=$(gh pr list --head $BRANCH_NAME --json number -q '.[0].number')
          if [ -z $PR ]; then
            gh pr create \
            --head $BRANCH_NAME \
            --title "Automated dependency upgrades" \
            --body "Full log: https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}"
          else
            echo "Pull request already exists, won't create a new one."
          fi