#!/bin/sh
#
# Pre-commit hook to format C++ files with clang-format
# Excludes third-party library folders

# Folders to exclude (third-party sources)
EXCLUDE_DIRS="libs"

# Get list of staged C++ files
STAGED_FILES=$(git diff --cached --name-only --diff-filter=ACM | grep -E '\.(cpp|h|c|cc|cxx|hpp)$')

if [ -z "$STAGED_FILES" ]; then
  exit 0
fi

# Check if clang-format is available
if ! command -v clang-format >/dev/null 2>&1; then
  echo "Warning: clang-format not found. Skipping formatting."
  echo "Install clang-format to enable automatic formatting."
  exit 0
fi

# Format each file that is not in excluded directories
for FILE in $STAGED_FILES; do
  # Check if file is in excluded directory
  EXCLUDED=0
  for EXCLUDE_DIR in $EXCLUDE_DIRS; do
    case "$FILE" in
      $EXCLUDE_DIR/*)
        EXCLUDED=1
        break
        ;;
    esac
  done

  if [ $EXCLUDED -eq 0 ]; then
    echo "Formatting: $FILE"
    clang-format -i "$FILE"
    git add "$FILE"
  else
    echo "Skipping (third-party): $FILE"
  fi
done

exit 0