import json

from kafka import KafkaConsumer

# Thresholds
TEMP_TOO_COLD = -10
TEMP_TOO_HOT = 35


def process_temperature_reading(reading):
    temperature = reading["temperature"]
    if temperature < TEMP_TOO_COLD:
        alert = f"WARNING: Temperature is too cold! ({temperature}°C)"
    elif temperature > TEMP_TOO_HOT:
        alert = f"WARNING: Temperature is too hot! ({temperature}°C)"
    else:
        alert = f"Temperature is normal. ({temperature}°C)"
    return alert


if __name__ == "__main__":
    consumer = KafkaConsumer(
        "temperature_readings",
        bootstrap_servers="localhost:9092",
        auto_offset_reset="earliest",
    )

    for message in consumer:
        reading = json.loads(message.value)
        alert_message = process_temperature_reading(reading)
        print(alert_message)