#!/bin/bash

# Function to print error messages in red
print_error() {
  echo -e "\033[0;31mError: $1\033[0m"
}

# Check if clang-format is available
if ! command -v clang-format &> /dev/null
then
  print_error "clang-format is not installed or not in your PATH. Please install it to use this pre-commit hook."
  exit 1
fi

# Define the pre-commit hook content
HOOK_CONTENT='''#!/bin/bash

# Function to print error messages in red
print_error() {
  echo -e "\033[0;31mError: $1\033[0m"
}

# Check if clang-format is available
if ! command -v clang-format &> /dev/null
then
  print_error "clang-format is not installed or not in your PATH. Cannot format files."
  exit 1
fi

# Get all staged C/C++/Objective-C/C++ files
FILES_TO_FORMAT=$(git diff --cached --name-only --diff-filter=ACM | grep -E "\.(c|h|cpp|hpp|cc|hh|cxx|hxx|m|mm)$")

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

for FILE in $FILES_TO_FORMAT
do
  # Check if the file exists and is a regular file
  if [ -f "$FILE" ]; then
    # Format the file and check for changes
    clang-format -style=file -i "$FILE"
    if ! git diff --quiet "$FILE"; then
      git add "$FILE"
      echo "Formatted $FILE with clang-format."
    fi
  fi
done

exit 0
'''

# Install the pre-commit hook
HOOK_PATH=".git/hooks/pre-commit"

# Create the hooks directory if it doesn't exist
mkdir -p .git/hooks

echo "$HOOK_CONTENT" > "$HOOK_PATH"
chmod +x "$HOOK_PATH"

echo "Git pre-commit hook for clang-format installed successfully."