#!/usr/bin/env python3
"""
Simple monitoring script to track service health and resource usage
"""
import os
import time
import psutil
import json
from datetime import datetime

from src import config as app_config

def get_system_stats():
    """Get current system statistics"""
    try:
        process = psutil.Process()
        
        # Memory info
        memory_info = process.memory_info()
        memory_mb = memory_info.rss / 1024 / 1024
        
        # CPU info
        cpu_percent = process.cpu_percent(interval=1)
        
        # Disk info (prefer DATA_DIR)
        disk_root = app_config.DATA_DIR if os.path.exists(app_config.DATA_DIR) else '/'
        disk_usage = psutil.disk_usage(disk_root)
        disk_free_gb = disk_usage.free / (1024**3)
        disk_used_percent = (disk_usage.used / disk_usage.total) * 100
        
        # Process info
        num_threads = process.num_threads()
        
        return {
            "timestamp": datetime.now().isoformat(),
            "memory_mb": round(memory_mb, 2),
            "cpu_percent": round(cpu_percent, 2),
            "disk_free_gb": round(disk_free_gb, 2),
            "disk_used_percent": round(disk_used_percent, 2),
            "num_threads": num_threads,
            "pid": process.pid
        }
    except Exception as e:
        return {
            "timestamp": datetime.now().isoformat(),
            "error": str(e)
        }

def log_stats():
    """Log system statistics to file"""
    stats = get_system_stats()
    
    # Create logs directory if it doesn't exist
    log_dir = app_config.LOG_DIR
    os.makedirs(log_dir, exist_ok=True)

    # Write to log file
    log_file = os.path.join(log_dir, "system_stats.jsonl")
    with open(log_file, "a") as f:
        f.write(json.dumps(stats) + "\n")
    
    # Print to stdout for supervisord
    print(f"[Monitor] {json.dumps(stats)}")
    
    # Check for issues
    if "error" not in stats:
        issues = []
        
        if stats["memory_mb"] > 450:  # 90% of 512MB limit
            issues.append(f"HIGH MEMORY: {stats['memory_mb']:.1f}MB")
            
        if stats["cpu_percent"] > 80:
            issues.append(f"HIGH CPU: {stats['cpu_percent']:.1f}%")
            
        if stats["disk_free_gb"] < 0.5:
            issues.append(f"LOW DISK: {stats['disk_free_gb']:.1f}GB free")
            
        if issues:
            print(f"[Monitor] ALERTS: {', '.join(issues)}")

if __name__ == "__main__":
    print("[Monitor] Starting system monitoring...")
    
    while True:
        try:
            log_stats()
            time.sleep(60)  # Log every minute
        except KeyboardInterrupt:
            print("[Monitor] Monitoring stopped")
            break
        except Exception as e:
            print(f"[Monitor] Error: {e}")
            time.sleep(60)