name: Sunday Submodule Update

on:
  # At 4:00 (CET)
  # schedule:
  #   - cron: '0 2 * * 0'
  workflow_dispatch:

jobs:
  update_submodules:
    name: Update submodules and create PR
    runs-on: ubuntu-latest
    steps:

      - name: Checkout repo with submodules
        uses: actions/checkout@v2
        with:
          token: ${{ secrets.REPO_TOKEN }}
          submodules: recursive

      - name: Fetch all remote branches
        run: git fetch --all

      - name: List cooker branches by date
        id: list_branches
        run: |
          BRANCHES=$(git for-each-ref --sort=-committerdate refs/remotes/origin/cooker* --format='%(refname)') echo “::set-output name=branches::$BRANCHES”

      - name: Select target branch
        id: select_branch
        run: |
          TARGET_BRANCH=(echo{{ steps.list_branches.outputs.branches }} | head -n 1)
          echo “::set-output name=target_branch::$TARGET_BRANCH”
          git checkout $TARGET_BRANCH
          echo "Working on $TARGET_BRANCH"

      - name: Update submodules with command
        run: git submodule update --remote --merge --recursive

      - name: Configure Git credentials
        run: |
          git config --global user.name 'GitHub bot'
          git config --global user.email 'bot@noreply.github.com'

      - name: Commit and push changes
        run: |
          git commit -am "Sunday submodule update"
          git push origin HEAD:submodule-update

      - name: Create PR
        uses: repo-sync/pull-request@v2
        with:
          github_token: ${{ secrets.REPO_TOKEN }}
          pr_title: "Sunday submodule update"
          pr_body: "This PR updates the submodules to the latest commit on their remote repositories."
          source_branch: "submodule-update"
          destination_branch: "cooker*"