name: Minify all Lua files to minified branch

on:
  push:
    branches:
      - main

jobs:
  minify:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout main branch
        uses: actions/checkout@v4
        with:
          ref: main
          fetch-depth: 0

      - name: Get latest commit info
        id: commit
        run: |
          COMMIT_MSG=$(git log -1 --pretty=%s)
          echo "message=${COMMIT_MSG}" >> $GITHUB_OUTPUT

      - name: Set up Node.js
        uses: actions/setup-node@v4
        with:
          node-version: '20'

      - name: Install luamin
        run: npm install -g luamin

      - name: Switch to minified branch
        run: git checkout minified

      - name: Copy files from main
        run: |
          git checkout main -- .
          git reset HEAD

      - name: Minify all Lua files
        run: |
          set -e
          for file in $(find . -name "*.lua" -not -path "./.git/*"); do
            luamin -f "$file" > "$file.min" || true
            # For some stupid fucking reason, luamin returns exit code 1
            mv "$file.min" "$file"
          done

      - name: Commit and push to minified branch
        run: |
          git config user.name "github-actions[bot]"
          git config user.email "github-actions[bot]@users.noreply.github.com"

          git add -A
          git commit -m "${{ steps.commit.outputs.message }} (minified)"
          git push origin minified