import psutil
import time
from datetime import datetime

class SystemMonitor:
    def __init__(self, messenger, ollama_manager):
        self.messenger = messenger
        self.ollama_monitor = ollama_manager
        self.last_health_check = datetime.now()

    def check_health(self):
        """시스템 상태 점검 및 알림 (CPU, RAM, GPU) - 5분마다 실행"""
        now = datetime.now()
        # 5분에 한 번씩만 체크
        if (now - self.last_health_check).total_seconds() < 300:
            return

        self.last_health_check = now
        alerts = []

        # 1. CPU Check (Double Verify)
        # 1초 간격으로 측정
        cpu_usage = psutil.cpu_percent(interval=1)
        
        if cpu_usage > 90:
            # 일시적인 스파이크일 수 있으므로 3초 후 재측정
            time.sleep(3)
            cpu_usage_2nd = psutil.cpu_percent(interval=1)
            
            if cpu_usage_2nd > 90:
                # 과부하 시 원인 프로세스 추적
                top_processes = []
                for proc in psutil.process_iter(['pid', 'name', 'cpu_percent']):
                    try:
                        # Windows 유휴 프로세스 제외
                        if proc.info['name'] == 'System Idle Process':
                            continue
                        top_processes.append(proc.info)
                    except (psutil.NoSuchProcess, psutil.AccessDenied):
                        pass
                
                # CPU 사용률 내림차순 정렬
                top_processes.sort(key=lambda x: x['cpu_percent'], reverse=True)
                
                # 상위 프로세스들의 CPU 합계 검증 (측정 오류 필터링)
                total_top_cpu = sum(p['cpu_percent'] for p in top_processes[:3])
                if total_top_cpu < 30.0:
                    print(f"⚠️ [Monitor] Ignored CPU Alert: usage={cpu_usage_2nd}% but top3_sum={total_top_cpu}%")
                else:
                    top_3_str = ""
                    for p in top_processes[:3]:
                        top_3_str += f"\n- {p['name']} ({p['cpu_percent']}%)"
                        
                    alerts.append(f"🔥 **[CPU Overload]** Usage: `{cpu_usage_2nd}%`\n**Top Processes:**{top_3_str}")

        # 2. RAM Check
        ram = psutil.virtual_memory()
        if ram.percent > 90:
            alerts.append(f"💾 **[RAM High]** Usage: `{ram.percent}%` (Free: {ram.available / 1024**3:.1f}GB)")

        # 3. GPU Check
        if self.ollama_monitor:
            gpu_status = self.ollama_monitor.get_gpu_status()
            temp = gpu_status.get('temp', 0)
            if temp > 80:
                alerts.append(f"♨️ **[GPU Overheat]** Temp: `{temp}°C`")

        # 알림 전송
        if alerts:
            msg = "⚠️ **[System Health Alert]**\n" + "\n".join(alerts)
            if self.messenger:
                self.messenger.send_message(msg)