"""
Utility functions for the Vulnerability Intelligence Agent (VIA).
"""
import os
import logging
import json
import datetime
from typing import Dict, List, Any, Optional, Union

def setup_logger(name: str) -> logging.Logger:
    """
    Set up a logger with the specified name.
    
    Args:
        name: Name of the logger
        
    Returns:
        Configured logger instance
    """
    logger = logging.getLogger(name)
    if not logger.handlers:
        handler = logging.StreamHandler()
        formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
        handler.setFormatter(formatter)
        logger.addHandler(handler)
    
    return logger

def merge_vulnerability_data(results: List[Dict[str, Any]]) -> Dict[str, Any]:
    """
    Merge vulnerability data from multiple sources.
    
    Args:
        results: List of dictionaries with vulnerability data from different sources
        
    Returns:
        Merged dictionary with all vulnerabilities
    """
    # Simple implementation - in a real system, this would be more sophisticated
    if not results:
        return {"software": "", "version": "", "vulnerabilities": []}
    
    merged = {
        "software": results[0].get("software", ""),
        "version": results[0].get("version", ""),
        "vulnerabilities": []
    }
    
    # Simple merge - just combine all vulnerabilities
    for result in results:
        if "vulnerabilities" in result:
            merged["vulnerabilities"].extend(result["vulnerabilities"])
    
    return merged

def save_report(data: Dict[str, Any], filename: str, report_dir: str = "reports") -> str:
    """
    Save vulnerability data to a JSON file.
    
    Args:
        data: Vulnerability data to save
        filename: Base filename (without extension)
        report_dir: Directory to save the report in
        
    Returns:
        Path to the saved JSON file
    """
    # Ensure the reports directory exists
    os.makedirs(report_dir, exist_ok=True)
    
    # Add timestamp to filename to avoid overwriting
    timestamp = datetime.datetime.now().strftime("%Y%m%d_%H%M%S")
    json_filename = f"{filename}_{timestamp}.json"
    json_path = os.path.join(report_dir, json_filename)
    
    # Save the data to a JSON file
    with open(json_path, 'w') as f:
        json.dump(data, f, indent=2)
    
    return json_path

def generate_markdown_report(data: Dict[str, Any], filename: str, report_dir: str = "reports") -> str:
    """
    Generate a Markdown report from vulnerability data.
    
    Args:
        data: Vulnerability data
        filename: Base filename (without extension)
        report_dir: Directory to save the report in
        
    Returns:
        Path to the generated Markdown file
    """
    # Ensure the reports directory exists
    os.makedirs(report_dir, exist_ok=True)
    
    # Add timestamp to filename to avoid overwriting
    timestamp = datetime.datetime.now().strftime("%Y%m%d_%H%M%S")
    md_filename = f"{filename}_{timestamp}.md"
    md_path = os.path.join(report_dir, md_filename)
    
    with open(md_path, 'w') as f:
        # Write title
        f.write(f"# Vulnerability Report: {data['software']} {data['version']}\n\n")
        f.write(f"*Generated on: {datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S')}*\n\n")
        
        # Write summary
        f.write("## Summary\n\n")
        vuln_count = len(data.get('vulnerabilities', []))
        f.write(f"Found **{vuln_count}** vulnerabilities for {data['software']} {data['version']}.\n\n")
        
        # Write vulnerabilities
        if vuln_count > 0:
            f.write("## Vulnerabilities\n\n")
            
            for i, vuln in enumerate(data['vulnerabilities'], 1):
                f.write(f"### {i}. {vuln.get('id', 'Unknown ID')}\n\n")
                f.write(f"**Severity:** {vuln.get('severity', 'Unknown')}")
                if 'cvss' in vuln:
                    f.write(f" (CVSS: {vuln['cvss']})")
                f.write("\n\n")
                
                f.write(f"**Description:** {vuln.get('description', 'No description available.')}\n\n")
                
                if 'date' in vuln:
                    f.write(f"**Published:** {vuln['date']}\n\n")
                
                if 'recommendation' in vuln:
                    f.write(f"**Recommendation:** {vuln['recommendation']}\n\n")
                
                if 'source' in vuln:
                    f.write(f"**Source:** [{vuln['source']}]({vuln['source']})\n\n")
                
                f.write("---\n\n")
        else:
            f.write("## No vulnerabilities found\n\n")
            f.write("No known vulnerabilities were found for this software and version.\n\n")
        
        # Write footer
        f.write("## References\n\n")
        f.write("- [CVE (Common Vulnerabilities and Exposures)](https://cve.mitre.org/)\n")
        f.write("- [NVD (National Vulnerability Database)](https://nvd.nist.gov/)\n")
        f.write("- [CISA Known Exploited Vulnerabilities Catalog](https://www.cisa.gov/known-exploited-vulnerabilities-catalog)\n")
        f.write("- [CWE (Common Weakness Enumeration)](https://cwe.mitre.org/)\n")
    
    return md_path