name: Compress PNGs

on:
  schedule:
    - cron: "0 0 * * 0"
  workflow_dispatch:

jobs:
  compress_pngs:
    runs-on: ubuntu-latest
    permissions:
      contents: write

    steps:
      - name: Checkout Repository
        uses: actions/checkout@v3
        with:
          ref: ${{ github.ref_name }}

      - name: Install Dependencies
        run: |
          sudo apt-get update
          sudo apt-get install -y zopfli

      - name: Compress PNG Files
        run: |
          echo "Compressing PNGs..."
          find png/ -iname "*.png" -print0 | xargs -0 -P 4 -I{} zopflipng -y {} {}

      - name: Commit and Push Changes
        run: |
          git config --global user.email "noreply@lammers.media"
          git config --global user.name "Dashboard Icons Bot"
          git add png/
          git commit -m ":compression: Compressed PNGs" || exit 0
          git pull --rebase origin ${{ github.ref_name }}
          git push origin HEAD:${{ github.ref_name }}