name: Check Lowercase Filenames

on:
  pull_request:
    paths:
      - 'ct/*.sh'
      - 'install/*.sh'
      - 'json/*.json'

jobs:
  check_lowercase:
    runs-on: ubuntu-latest

    steps:
      # Step 1: Checkout the code
      - name: Checkout code
        uses: actions/checkout@v4
        with:
          fetch-depth: 0  # Ensure the full history is fetched for accurate diffing

      # Step 2: Fetch the base branch
      - name: Fetch base branch
        run: git fetch origin ${{ github.base_ref }}

      # Step 3a: Validate filenames in ct directory
      - name: "Validate filenames in ct directory"
        run: |
          changed_files=$(git diff --name-only origin/${{ github.base_ref }}...HEAD | grep -E '^ct/.*\.sh$')

          ERROR_COUNT=0

          for FILE in $changed_files; do
              BASENAME=$(basename "$FILE")
              if [[ "$BASENAME" =~ ^[a-z0-9._-]+$ ]]; then
                  echo "$FILE: Check for lowercase in filename passed."
              else
                  echo "Error in $FILE. Change filename to lowercase."
                  ERROR_COUNT=$((ERROR_COUNT + 1))
              fi
          done

          if [ "$ERROR_COUNT" -ne 0 ]; then
              exit 1
          else
              echo "All filenames in ct directory passed the lowercase check."
          fi

      # Step 3b: Validate filenames in install directory
      - name: "Validate filenames in install directory"
        run: |
          changed_files=$(git diff --name-only origin/${{ github.base_ref }}...HEAD | grep -E '^install/.*\.sh$')

          ERROR_COUNT=0

          for FILE in $changed_files; do
              BASENAME=$(basename "$FILE")
              if [[ "$BASENAME" =~ ^[a-z0-9._-]+$ ]]; then
                  echo "$FILE: Check for lowercase in filename passed."
              else
                  echo "Error in $FILE. Change filename to lowercase."
                  ERROR_COUNT=$((ERROR_COUNT + 1))
              fi
          done

          if [ "$ERROR_COUNT" -ne 0 ]; then
              exit 1
          else
              echo "All filenames in install directory passed the lowercase check."
          fi

      # Step 3c: Validate filenames in json directory
      - name: "Validate filenames in json directory."
        run: |
          changed_files=$(git diff --name-only origin/${{ github.base_ref }}...HEAD | grep -E '^json/.*\.json$')

          ERROR_COUNT=0

          for FILE in $changed_files; do
              BASENAME=$(basename "$FILE")
              if [[ "$BASENAME" =~ ^[a-z0-9._-]+$ ]]; then
                  echo "$FILE: Check for lowercase in filename passed."
              else
                  echo "Error in $FILE. Change filename to lowercase."
                  ERROR_COUNT=$((ERROR_COUNT + 1))
              fi
          done

          if [ "$ERROR_COUNT" -ne 0 ]; then
              exit 1
          else
              echo "All filenames in json directory passed the lowercase check."
          fi