#!/bin/bash
# Fenrir Pre-commit Hook
# 
# This hook validates Python syntax and basic code quality before commits.
# Install with: ln -sf ../../tools/pre-commit-hook .git/hooks/pre-commit

set -e

# Colors for output
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
NC='\033[0m' # No Color

echo -e "${GREEN}Fenrir Pre-commit Validation${NC}"
echo "=================================="

# Get the repository root
REPO_ROOT=$(git rev-parse --show-toplevel)
cd "$REPO_ROOT"

# Track validation results
VALIDATION_FAILED=0

# 1. Python Syntax Validation
echo -e "\n${YELLOW}1. Validating Python syntax...${NC}"
if python3 tools/validate_syntax.py --check-only; then
    echo -e "${GREEN}✓ Syntax validation passed${NC}"
else
    echo -e "${RED}✗ Syntax validation failed${NC}"
    echo "Run: python3 tools/validate_syntax.py --fix"
    VALIDATION_FAILED=1
fi

# 2. Check for common issues in modified files
echo -e "\n${YELLOW}2. Checking modified files for common issues...${NC}"

# Get list of staged Python files
STAGED_PYTHON_FILES=$(git diff --cached --name-only --diff-filter=ACM | grep '\.py$' || true)

if [ -n "$STAGED_PYTHON_FILES" ]; then
    ISSUES_FOUND=0
    
    for file in $STAGED_PYTHON_FILES; do
        if [ -f "$file" ]; then
            # Check for unterminated strings (the main issue from the email)
            if grep -n 'f".*{$' "$file" >/dev/null 2>&1; then
                echo -e "${RED}✗ $file: Potential unterminated f-string${NC}"
                ISSUES_FOUND=1
            fi
            
            # Check for missing imports that are commonly used
            if grep -q 'debug\.DebugLevel\.' "$file" && ! grep -q 'from.*debug' "$file" && ! grep -q 'import.*debug' "$file"; then
                echo -e "${YELLOW}⚠ $file: Uses debug.DebugLevel but no debug import found${NC}"
            fi
            
            # Check for extremely long lines (over 120 chars) that might indicate issues
            if awk 'length($0) > 120 {print NR ": " $0; exit 1}' "$file" >/dev/null 2>&1; then
                # Only warn, don't fail
                line_num=$(awk 'length($0) > 120 {print NR; exit}' "$file")
                echo -e "${YELLOW}⚠ $file:$line_num: Very long line (>120 chars)${NC}"
            fi
        fi
    done
    
    if [ $ISSUES_FOUND -eq 0 ]; then
        echo -e "${GREEN}✓ No common issues found in modified files${NC}"
    else
        echo -e "${RED}✗ Common issues found in modified files${NC}"
        VALIDATION_FAILED=1
    fi
else
    echo -e "${GREEN}✓ No Python files modified${NC}"
fi

# 3. Quick import test for core modules
echo -e "\n${YELLOW}3. Testing core module imports...${NC}"
IMPORT_FAILED=0

# Test core imports that are critical
CORE_MODULES=(
    "src.fenrirscreenreader.core.fenrirManager"
    "src.fenrirscreenreader.core.commandManager" 
    "src.fenrirscreenreader.core.eventManager"
)

cd src
for module in "${CORE_MODULES[@]}"; do
    if python3 -c "import $module" 2>/dev/null; then
        echo -e "${GREEN}✓ $module${NC}"
    else
        echo -e "${RED}✗ $module (import failed)${NC}"
        IMPORT_FAILED=1
    fi
done
cd "$REPO_ROOT"

if [ $IMPORT_FAILED -eq 1 ]; then
    echo -e "${RED}✗ Core module import test failed${NC}"
    VALIDATION_FAILED=1
else
    echo -e "${GREEN}✓ Core module imports successful${NC}"
fi

# 4. Check for secrets or sensitive data
echo -e "\n${YELLOW}4. Checking for potential secrets...${NC}"
SECRETS_FOUND=0

if [ -n "$STAGED_PYTHON_FILES" ]; then
    for file in $STAGED_PYTHON_FILES; do
        if [ -f "$file" ]; then
            # Check for potential passwords, keys, tokens
            if grep -i -E '(password|passwd|pwd|key|token|secret|api_key).*=.*["\'][^"\']{8,}["\']' "$file" >/dev/null 2>&1; then
                echo -e "${RED}✗ $file: Potential hardcoded secret detected${NC}"
                SECRETS_FOUND=1
            fi
        fi
    done
fi

if [ $SECRETS_FOUND -eq 0 ]; then
    echo -e "${GREEN}✓ No potential secrets found${NC}"
else
    echo -e "${RED}✗ Potential secrets found - please review${NC}"
    VALIDATION_FAILED=1
fi

# Summary
echo -e "\n${'='*50}"
if [ $VALIDATION_FAILED -eq 0 ]; then
    echo -e "${GREEN}✓ All pre-commit validations passed${NC}"
    echo -e "${GREEN}Commit allowed to proceed${NC}"
    exit 0
else
    echo -e "${RED}✗ Pre-commit validation failed${NC}"
    echo -e "${RED}Commit blocked - please fix issues above${NC}"
    echo ""
    echo "Quick fixes:"
    echo "  • Python syntax: python3 tools/validate_syntax.py --fix"
    echo "  • Review flagged files manually"
    echo "  • Re-run commit after fixes"
    exit 1
fi