import json


class Heater:
    def __init__(self, topic, set_topic):
        self.not_initialized_yet = True
        self.wanted_temperature = 15
        self.actual_temperature = 15
        self.set_topic = set_topic
        self.topic = topic

    def payload(self):
        payload = {
            "system_mode": "auto",
            "current_heating_setpoint": str(self.wanted_temperature),
            "eurotronic_host_flags": {"window_open": True}
        }
        return json.dumps(payload)

    def needs_publish(self):
        if self.not_initialized_yet:
            return True
        else:
            return self.wanted_temperature != self.actual_temperature

    def update_actual_heating_point(self, payload):
        heating_setpoint = int(payload["current_heating_setpoint"])
        if self.not_initialized_yet:
            self.not_initialized_yet = False
            self.wanted_temperature = heating_setpoint
            print("%s: update wanted temperature %d" % (self.topic, self.actual_temperature))
        self.actual_temperature = heating_setpoint
        print("%s: update actual temperature %d" % (self.topic, self.actual_temperature))

    def topic_and_payload_for_query(self):
        payload = {
            "current_heating_setpoint": ""
        }
        return ("%s/get" % self.topic), json.dumps(payload)