from time import perf_counter

class Controller():
    def __init__(self,
                 # Actions
                 # Target value we want to reach, in what period ()
                 target=None, reach_period_s=None,
                 # Timeframe we need to wait before changing the
                 # system output (means: how fast we can trigger
                 # on/off states).  Used to prevent breaking fridge or
                 # other actuators.
                 refractary_period_s=10,
                 # Send notifications outside this range?
                 warning_range=(None, None)):
        self.input          = None
        self.target         = target
        self.range          = warning_range

        self.reach_period_s      = reach_period_s
        self.refractary_period_s = refractary_period_s

    def set_reach_period(self, reach_period_s):
        self.reach_period_s = reach_period_s

    def set_input(self, input):
        self.input = input

    def set_input_label(self, label):
        self.input_label = label

    def set_target(self, target):
        print('Setting target', target)
        self.target = target

    def get_target(self):
        return self.target

    def set_warning_range(self, range):
        print('Setting range', range)
        self.range = range

    def get_warning_range(self):
        return self.range

    def one_cycle(self, time=None):
        print("ERROR: This function must be implemented by the controller")

    "Set the input, run `one_cycle' and return the required actuator action."
    def apply(self, input, time=perf_counter):
        # Set the current input
        self.set_input(input)
        # Call one cycle
        action = self.one_cycle(time())
        # TODO: Check refractary period?
        return action