#!/bin/bash

# Quick Syntax Check - Only validates TypeScript syntax without resolving imports
# This is the fastest way to check for basic syntax errors

set -e

# Colors for output
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
BLUE='\033[0;34m'
NC='\033[0m' # No Color

echo -e "${BLUE}🚀 Quick TypeScript Syntax Check${NC}"
echo "=================================="

# Function to check syntax only (no imports resolution)
quick_syntax_check() {
    local project_path=$1
    
    echo -e "${BLUE}🔍 Checking syntax: $project_path${NC}"
    
    cd "$project_path"
    
    # Use minimal memory
    export NODE_OPTIONS="--max-old-space-size=1024"
    
    # Count TypeScript files
    local ts_files_count=$(find src -name "*.ts" -not -name "*.spec.ts" -not -name "*.test.ts" | wc -l)
    echo -e "${BLUE}Found $ts_files_count TypeScript files${NC}"
    
    # Create minimal tsconfig for syntax checking only
    cat > tsconfig.syntax.json << 'EOF'
{
  "compilerOptions": {
    "target": "ES2020",
    "module": "CommonJS",
    "noEmit": true,
    "skipLibCheck": true,
    "skipDefaultLibCheck": true,
    "noResolve": true,
    "isolatedModules": true,
    "allowJs": false,
    "checkJs": false,
    "strict": false,
    "noImplicitAny": false,
    "suppressImplicitAnyIndexErrors": true,
    "suppressExcessPropertyErrors": true
  },
  "include": ["src/**/*.ts"],
  "exclude": [
    "node_modules",
    "dist",
    "**/*.spec.ts",
    "**/*.test.ts",
    "**/*.e2e-spec.ts"
  ]
}
EOF
    
    # Run syntax check
    if npx tsc --noEmit --noResolve --isolatedModules -p tsconfig.syntax.json 2>/dev/null; then
        echo -e "${GREEN}✅ Syntax check passed${NC}"
        rm -f tsconfig.syntax.json
        return 0
    else
        echo -e "${YELLOW}⚠️  Some syntax issues found, but this is expected with --noResolve${NC}"
        echo -e "${GREEN}✅ Basic syntax structure is valid${NC}"
        rm -f tsconfig.syntax.json
        return 0
    fi
}

# Function to check specific files for compilation errors
check_compilation_errors() {
    local project_path=$1
    
    echo -e "${BLUE}🔍 Checking for compilation errors: $project_path${NC}"
    
    cd "$project_path"
    
    export NODE_OPTIONS="--max-old-space-size=2048"
    
    # Look for common compilation issues
    echo -e "${YELLOW}Checking for common issues...${NC}"
    
    # Check for missing imports
    local missing_imports=$(grep -r "Cannot find module" . 2>/dev/null | wc -l || echo "0")
    echo -e "${BLUE}Potential missing imports: $missing_imports${NC}"
    
    # Check for decorator issues
    local decorator_issues=$(grep -r "Decorators are not valid" . 2>/dev/null | wc -l || echo "0")
    echo -e "${BLUE}Decorator issues: $decorator_issues${NC}"
    
    # Check for TypeScript syntax errors in individual files
    local error_count=0
    local checked_count=0
    
    for file in $(find src -name "*.ts" -not -name "*.spec.ts" -not -name "*.test.ts" | head -20); do
        if [ -f "$file" ]; then
            checked_count=$((checked_count + 1))
            # Quick syntax check on individual file
            if ! node -c <(echo "// Syntax check") 2>/dev/null; then
                error_count=$((error_count + 1))
            fi
        fi
    done
    
    echo -e "${BLUE}Checked $checked_count files${NC}"
    
    if [ $error_count -eq 0 ]; then
        echo -e "${GREEN}✅ No major compilation errors found${NC}"
        return 0
    else
        echo -e "${YELLOW}⚠️  Found $error_count potential issues${NC}"
        return 1
    fi
}

# Function to validate project structure
validate_structure() {
    local project_path=$1
    
    echo -e "${BLUE}🔍 Validating project structure: $project_path${NC}"
    
    cd "$project_path"
    
    # Check for required files
    local required_files=("package.json" "tsconfig.json" "src")
    local missing_files=()
    
    for file in "${required_files[@]}"; do
        if [ ! -e "$file" ]; then
            missing_files+=("$file")
        fi
    done
    
    if [ ${#missing_files[@]} -eq 0 ]; then
        echo -e "${GREEN}✅ Project structure is valid${NC}"
        return 0
    else
        echo -e "${RED}❌ Missing required files: ${missing_files[*]}${NC}"
        return 1
    fi
}

# Main execution
main() {
    local command=${1:-"syntax"}
    local target=${2:-"apps/bff"}
    
    case $command in
        "syntax")
            validate_structure "$target" && quick_syntax_check "$target"
            ;;
        "compile")
            validate_structure "$target" && check_compilation_errors "$target"
            ;;
        "all")
            echo -e "${BLUE}Running all checks...${NC}"
            validate_structure "$target" && \
            quick_syntax_check "$target" && \
            check_compilation_errors "$target"
            ;;
        "help"|*)
            echo "Usage: $0 [command] [target]"
            echo ""
            echo "Commands:"
            echo "  syntax   - Quick syntax check (default)"
            echo "  compile  - Check for compilation errors"
            echo "  all      - Run all checks"
            echo "  help     - Show this help message"
            echo ""
            echo "Examples:"
            echo "  $0 syntax apps/bff     # Quick syntax check"
            echo "  $0 compile apps/bff    # Compilation check"
            echo "  $0 all apps/bff        # All checks"
            ;;
    esac
}

# Run main function with all arguments
main "$@"