import time

class AlertManager:
    def __init__(self):
        self.alerts = []
        self.on_alert_callback = None
        
    def set_on_alert_callback(self, callback):
        self.on_alert_callback = callback

    def add_alert(self, alert):
        self.alerts.append(alert)
        if self.on_alert_callback:
            self.on_alert_callback(alert)

    def get_alerts(self):
        return self.alerts

    def clear_alerts(self):
        self.alerts.clear()
    
class Alert:
    def __init__(self, alertType: "AlertType", message: str, redistributed: bool = False, small_message: str = None):
        self.alertType = alertType
        self.message = message
        self.small_message = small_message
        self.timestamp = time.time()
        self.redistributed = redistributed

    def to_dict(self):
        return {
            "type": self.alertType,
            "message": self.message,
            "timestamp": self.timestamp
        }
        
    def to_json(self):
        import json
        return json.dumps(self.to_dict())
    
    def from_json(json_string: str) -> "Alert":
        import json
        data = json.loads(json_string)
        alert = Alert(data["type"], data["message"])
        alert.timestamp = data["timestamp"]
        return alert
        
class AlertType:
    COOKING_SAFETY = "COOKING_SAFETY"
    TEMPERATURE_ALERT = "TEMPERATURE_ALERT"