name: "Contrast Check"
on:
  pull_request:
    paths:
      - 'css/brands.css'
  push:
    paths:
      - 'css/brands.css'
  workflow_dispatch:

jobs:
  contrast-check:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout code
        uses: actions/checkout@v3
        with:
          fetch-depth: 0  # Fetch all history
      
      - name: Setup for contrast check
        run: |
          # For PR, fetch the base branch
          if [[ "${{ github.event_name }}" == "pull_request" ]]; then
            echo "Running on PR from ${{ github.head_ref }} to ${{ github.base_ref }}"
            git fetch origin ${{ github.base_ref }}:${{ github.base_ref }}
            echo "BASE_BRANCH=origin/${{ github.base_ref }}" >> $GITHUB_ENV
          else
            # For push or manual, use the default branch
            echo "Running on push or manual trigger"
            echo "BASE_BRANCH=HEAD~1" >> $GITHUB_ENV
          fi
          
          # Make script executable
          chmod +x ./scripts/audit-contrast.sh
      
      - name: Modify contrast check script
        run: |
          # Create a temporary version of the script with the correct reference
          grep -v "new_css=" ./scripts/audit-contrast.sh > temp.sh
          
          # Add the corrected git diff command
          echo "# ---- FIXED GIT DIFF HANDLING ----" >> temp.sh
          echo "new_css=\$(git diff $BASE_BRANCH --unified=0 -- css/brands.css | awk '/^\+.*(--button-text|--button-background|--button-border|background-image|\/\*|\.button-)/)" >> temp.sh
          
          # Add the rest of the original script 
          grep -A 1000 "if \[\[ -z \"\$new_css\" \]\]; then" ./scripts/audit-contrast.sh >> temp.sh
          
          # Replace the original script
          mv temp.sh ./scripts/audit-contrast.sh
          chmod +x ./scripts/audit-contrast.sh
      
      - name: Run Contrast Check
        run: ./scripts/audit-contrast.sh