name: Enforce unique printers across files
on: [pull_request]

jobs:
  unique-printer:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - name: Check for duplicate printer tokens
        run: |
          DELIM=','
          FIELD=4

          awk -F"$DELIM" 'NR>1 {print tolower($FIELD)}' fileA.csv | sort > a.txt
          awk -F"$DELIM" 'NR>1 {print tolower($FIELD)}' fileB.csv | sort > b.txt

          duplicates=$(comm -12 a.txt b.txt)

          if [ -n "$duplicates" ]; then
            echo "Duplicate printer tokens detected:"
            echo "$duplicates"
            exit 1
          fi