from datetime import datetime
from services.philips_hue import PhilipsHue
from sensors.people_counter import PeopleCounter
import logging
import json
from setup import hue_conf, LOG_FILE_PATH, counter


hue: PhilipsHue = PhilipsHue(hue_conf)  # Light interface
peopleCount: int = 0  # Global count of people on the inside


def change_cb(countChange: int, directionState: dict):
    """Handles basic logging of event data for later analysis.

    Args:
        countChange (int): The change in the number of people. Usually on of [-1, 0, 1].
        directionState (dict): Object describing the internal state of the sensor.
    """
    data = {
        "version": "v0.0",
        "previousPeopleCount": peopleCount,
        "countChange": countChange,
        "directionState": directionState,
        "dateTime": datetime.now(),
        "motionTriggeredLights": False,
    }

    try:
        with open(LOG_FILE_PATH, "a") as f:
            f.write(json.dumps(data, default=str) + "\n")
    except Exception as ex:
        logging.exception(f"Unable to write log file. {ex}")


def count_change(change: int) -> None:
    """Handles light state when people count changes

    Args:
        change (int): The change in the number of people. Usually on of [-1, 0, 1].
    """
    global hue
    global peopleCount

    # Are lights on at the moment?
    previous_lights_state = get_light_state()

    # Apply correction
    if peopleCount <= 0 and previous_lights_state:
        # Count was 0, but lights were on => people count was not actually 0
        peopleCount = 1
        logging.info(f"People count corrected to {peopleCount}")
    elif peopleCount > 0 and not previous_lights_state:
        # Count was >0, but lights were off => people count was actually 0
        peopleCount = 0
        logging.info(f"People count corrected to {peopleCount}")

    peopleCount += change
    if peopleCount < 0:
        peopleCount = 0
    logging.info(f"People count changed by {change}")

    # Handle light
    target_light_state = peopleCount > 0

    # Return, if there is no change
    if previous_lights_state == target_light_state:
        return

    set_light_state(target_light_state)


def set_light_state(target_light_state: bool) -> bool:
    """Sets the lights to the given state.

    Args:
        target_light_state (bool): Should lights on the inside be on or off.

    Returns:
        bool: Previous light state.
    """
    # Are lights on at the moment?
    previous_lights_state = get_light_state()
    if target_light_state == previous_lights_state:
        return previous_lights_state

    # Adjust light as necessary
    hue.set_group(hue_conf["light_group"], {"on": target_light_state})
    logging.info(f"Light state changed to {target_light_state}")

    return previous_lights_state


def get_light_state() -> bool:
    """
    Returns:
        bool: Current light state.
    """
    return hue.get_group(hue_conf["light_group"])["state"]["any_on"]


if __name__ == "__main__":
    # Represents callback trigger order
    counter.hookChange(change_cb)
    counter.hookCounting(count_change)

    counter.run()