#!/usr/bin/env python3
"""Log analyzer - counts log entries by level and outputs JSON summary."""
import json
import re
import sys
from collections import Counter
from pathlib import Path

def analyze_logs(file_path: str) -> dict:
    """Analyze a log file and return counts by log level."""
    pattern = re.compile(r'\b(DEBUG|INFO|WARNING|ERROR|CRITICAL)\b', re.IGNORECASE)
    counts = Counter()
    total = 0
    
    with open(file_path, 'r') as f:
        for line in f:
            matches = pattern.findall(line)
            for match in matches:
                counts[match.upper()] += 1
                total += 1
    
    return {
        "file": Path(file_path).name,
        "total_entries": total,
        "by_level": dict(sorted(counts.items())),
        "unique_levels": len(counts)
    }

if __name__ == "__main__":
    if len(sys.argv) != 3:
        print("Usage: log_analyzer.py <log_file> <output_json>")
        sys.exit(1)
    
    result = analyze_logs(sys.argv[1])
    output_path = sys.argv[2]
    
    Path(output_path).parent.mkdir(parents=True, exist_ok=True)
    with open(output_path, 'w') as f:
        json.dump(result, f, indent=2)
    
    print(f"Analyzed {result['total_entries']} entries to {output_path}")