import json
import os
import sys

FILE = "monitoring-data.json"
MAX_ENTRIES = 100

entry = {
    "timestamp": sys.argv[1],
    "status": sys.argv[2],
    "latency": float(sys.argv[3]),
    "request_count": int(sys.argv[4])
}

if os.path.exists(FILE):
    try:
        with open(FILE, "r") as f:
            data = json.load(f)
            if not isinstance(data, list):
                data = []
    except Exception:
        data = []
else:
    data = []

data.append(entry)

data = data[-MAX_ENTRIES:]

with open(FILE, "w") as f:
    json.dump(data, f, indent=2)