import urllib.request
import urllib.error
import time
import json
from datetime import datetime, timezone

API_URL = "http://localhost:3000"
METRICS_FILE = "metrics.json"

print(f"Starting monitoring for {API_URL}... (Press Ctrl+C to stop)")

while True:
    metrics = {
        "status": "Down",
        "latency_ms": 0,
        "total_requests": 0,
        "timestamp": datetime.now(timezone.utc).strftime("%Y-%m-%dT%H:%M:%SZ")
    }

    try:
        start_time = time.time()
        health_req = urllib.request.urlopen(f"{API_URL}/health", timeout=5)
        latency = time.time() - start_time

        if health_req.getcode() == 200:
            metrics["status"] = "Healthy"
            metrics["latency_ms"] = int(latency * 1000)  

            root_req = urllib.request.urlopen(f"{API_URL}/", timeout=5)
            root_data = json.loads(root_req.read().decode())
            metrics["total_requests"] = root_data.get("total_requests", 0)

    except Exception as e:
        pass

    with open(METRICS_FILE, "w") as f:
        json.dump(metrics, f, indent=4)

    current_time = datetime.now().strftime("%H:%M:%S")
    print(f"[{current_time}] Status: {metrics['status']} | Latency: {metrics['latency_ms']}ms | Requests: {metrics['total_requests']}")

    time.sleep(30)