#!/usr/bin/env python3
"""
Health Check Probe Simulator
Continuously sends heartbeat probes from all devices to test offline detection
"""

import requests
import time
import random
import os
import json
from datetime import datetime
from typing import List, Dict

class DeviceProbeSimulator:
    def __init__(self):
        self.api_base_url = os.getenv('API_BASE_URL', 'https://selfservice.cqers.com/drones/api')
        self.probe_interval = int(os.getenv('PROBE_INTERVAL_SECONDS', '60'))  # 1 minute default
        self.probe_failrate = int(os.getenv('PROBE_FAILRATE', '30'))  # 30% failure rate
        self.devices = []
        self.session = requests.Session()
        self.session.headers.update({
            'Content-Type': 'application/json',
            'User-Agent': 'HealthProbeSimulator/1.0'
        })
        
        print(f"🔧 Health Probe Simulator Configuration:")
        print(f"   API URL: {self.api_base_url}")
        print(f"   Probe Interval: {self.probe_interval} seconds")
        print(f"   Failure Rate: {self.probe_failrate}%")
        print()

    def fetch_devices(self) -> bool:
        """Fetch all devices from the API"""
        try:
            response = self.session.get(f"{self.api_base_url}/devices")
            if response.status_code == 200:
                data = response.json()
                if data.get('success') and 'data' in data:
                    self.devices = data['data']
                    print(f"📡 Fetched {len(self.devices)} devices for health monitoring")
                    for device in self.devices:
                        print(f"   - Device {device['id']}: {device.get('name', 'Unnamed')} ({device.get('location_description', 'No location')})")
                    return True
                else:
                    print(f"❌ API returned invalid data structure: {data}")
                    return False
            else:
                print(f"❌ Failed to fetch devices: HTTP {response.status_code}")
                print(f"   Response: {response.text}")
                return False
        except Exception as e:
            print(f"❌ Error fetching devices: {e}")
            return False

    def send_heartbeat(self, device: Dict) -> bool:
        """Send heartbeat for a specific device"""
        device_id = device['id']
        
        # Simulate probe failure based on failure rate
        if random.randint(1, 100) <= self.probe_failrate:
            print(f"💔 Simulating probe failure for Device {device_id} ({self.probe_failrate}% failure rate)")
            return False
        
        try:
            payload = {
                'device_id': device_id,
                'timestamp': int(time.time()),
                'status': 'online',
                'system_info': {
                    'cpu_usage': random.randint(20, 80),
                    'memory_usage': random.randint(30, 90),
                    'disk_usage': random.randint(40, 85),
                    'temperature': random.randint(25, 65),
                    'uptime': random.randint(3600, 86400)  # 1 hour to 1 day
                }
            }
            
            response = self.session.post(
                f"{self.api_base_url}/devices/heartbeat",
                json=payload,
                timeout=10
            )
            
            if response.status_code in [200, 201]:
                device_name = device.get('name', f'Device {device_id}')
                location = device.get('location_description', 'Unknown location')
                print(f"💓 Device {device_id}: Heartbeat sent successfully ({device_name} - {location})")
                return True
            else:
                print(f"❌ Failed to send heartbeat for Device {device_id}: HTTP {response.status_code}")
                print(f"   Response: {response.text}")
                return False
                
        except requests.exceptions.Timeout:
            print(f"⏰ Heartbeat timeout for Device {device_id}")
            return False
        except Exception as e:
            print(f"❌ Error sending heartbeat for Device {device_id}: {e}")
            return False

    def run_probe_cycle(self):
        """Run one complete probe cycle for all devices"""
        if not self.devices:
            print("⚠️ No devices to probe, fetching device list...")
            if not self.fetch_devices():
                print("❌ Cannot continue without device list")
                return
        
        print(f"\n🔄 Starting probe cycle at {datetime.now().strftime('%Y-%m-%d %H:%M:%S')}")
        print(f"   Probing {len(self.devices)} devices...")
        
        successful_probes = 0
        failed_probes = 0
        
        for device in self.devices:
            if self.send_heartbeat(device):
                successful_probes += 1
            else:
                failed_probes += 1
            
            # Small delay between probes to avoid overwhelming the server
            time.sleep(0.5)
        
        success_rate = (successful_probes / len(self.devices)) * 100 if self.devices else 0
        print(f"\n📊 Probe Cycle Summary:")
        print(f"   ✅ Successful: {successful_probes}")
        print(f"   ❌ Failed: {failed_probes}")
        print(f"   📈 Success Rate: {success_rate:.1f}%")
        print(f"   🎯 Target Failure Rate: {self.probe_failrate}%")
        print(f"   ⏰ Next cycle in {self.probe_interval} seconds")

    def run_continuous(self):
        """Run continuous health check probes"""
        print("🚀 Starting continuous health probe simulator...")
        print("   Press Ctrl+C to stop")
        print()
        
        # Initial device fetch
        if not self.fetch_devices():
            print("❌ Failed to fetch initial device list, exiting")
            return
        
        try:
            while True:
                self.run_probe_cycle()
                
                # Re-fetch devices every 10 cycles to catch new devices
                if hasattr(self, 'cycle_count'):
                    self.cycle_count += 1
                else:
                    self.cycle_count = 1
                
                if self.cycle_count % 10 == 0:
                    print(f"\n🔄 Refreshing device list (cycle {self.cycle_count})...")
                    self.fetch_devices()
                
                # Wait for next cycle
                time.sleep(self.probe_interval)
                
        except KeyboardInterrupt:
            print(f"\n\n🛑 Health probe simulator stopped by user")
        except Exception as e:
            print(f"\n\n❌ Unexpected error in probe simulator: {e}")

def main():
    print("=" * 60)
    print("🏥 DRONE DETECTION SYSTEM - HEALTH PROBE SIMULATOR")
    print("=" * 60)
    print()
    
    # Load environment variables
    probe_failrate = os.getenv('PROBE_FAILRATE', '30')
    probe_interval = os.getenv('PROBE_INTERVAL_SECONDS', '60')
    api_url = os.getenv('API_BASE_URL', 'https://selfservice.cqers.com/drones/api')
    
    print(f"📋 Configuration:")
    print(f"   PROBE_FAILRATE: {probe_failrate}%")
    print(f"   PROBE_INTERVAL_SECONDS: {probe_interval}s")
    print(f"   API_BASE_URL: {api_url}")
    print()
    
    simulator = DeviceProbeSimulator()
    simulator.run_continuous()

if __name__ == "__main__":
    main()