#!/bin/sh

# Pre-commit hook that automatically fixes trailing whitespace and missing newline at EOF
# This hook only fixes issues and never blocks commits

# Color codes for output
GREEN='\033[0;32m'
YELLOW='\033[0;33m'
NC='\033[0m' # No Color

# Get list of staged files
staged_files=$(git diff --cached --name-only --diff-filter=ACM)

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

files_fixed=0

# Process each staged file
for file in $staged_files; do
    if [ -f "$file" ]; then
        # Skip binary files
        if file -b --mime "$file" 2>/dev/null | grep -q "text"; then
            file_modified=0

            # Remove trailing whitespace
            if grep -q '[[:space:]]$' "$file" 2>/dev/null; then
                echo "${YELLOW}→${NC} Removing trailing whitespace from: $file"
                sed -i 's/[[:space:]]*$//' "$file" 2>/dev/null || true
                file_modified=1
            fi

            # Add newline at end of file if missing
            if [ -n "$(tail -c 1 "$file" 2>/dev/null)" ]; then
                echo "${YELLOW}→${NC} Adding newline at end of: $file"
                echo >> "$file" 2>/dev/null || true
                file_modified=1
            fi

            # Re-stage the file if it was modified
            if [ $file_modified -eq 1 ]; then
                git add "$file" 2>/dev/null || true
                files_fixed=$((files_fixed + 1))
            fi
        fi
    fi
done

# Report results
if [ $files_fixed -gt 0 ]; then
    echo "${GREEN}✓${NC} Fixed $files_fixed file(s) - changes have been staged"
else
    echo "${GREEN}✓${NC} No fixes needed - all files are clean"
fi

# Always exit successfully to never block commits
exit 0