name: Optimize images

# **What it does**: Optimize images.
# **Why we have it**: Reduce bandwidth needs.
# **Who does it impact**: Docs engineering.

on:
  workflow_dispatch:
  schedule:
    - cron: '45 17 * * 2' # Run Tuesdays at 17:45 UTC / 9:45 PST

permissions:
  contents: write
  pull-requests: write

jobs:
  optimize-images:
    if: github.repository == 'github/docs-internal'
    runs-on: ubuntu-latest
    steps:
      - name: Check out repo
        uses: actions/checkout@ec3a7ce113134d7a93b817d10a8272cb61118579

      - name: Install the Optipng package
        run: sudo apt-get update && sudo apt-get -y install optipng

      - name: Run the Optipng package
        run: find . -name '*.png' -print0 | xargs -0 optipng -nx

      - name: Make a branch, commit, push, and pull request
        run: |
          echo "If there's no changes, exit"
          if [[ !  `git status --porcelain` ]]
          then
            echo "No changes found"
            exit 0
          fi

          echo "Make a new branch"
          BRANCH="optimize-images-$(date +'%Y%m%d%H%M%S')"
          git checkout -b $BRANCH

          echo "Make a commit"
          git config user.name github-actions
          git config user.email github-actions@github.com
          git add "*.png"
          git commit --message="Optimize images"

          echo "Push up changes"
          git push --set-upstream origin $BRANCH

          echo "Open a pull request"
          gh pr create --title "Optimize images" --body "Optimize images" --reviewer "@github/docs-engineering"
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}