from . import controllers
from scm import stringify
from time import perf_counter

class FixedDutyCycle(controllers.Controller):
    def __init__(self, *args, **kwargs):
        self.start = kwargs.pop('start_time', perf_counter())
        self.period = kwargs.pop('period')
        self.set_duty(kwargs.pop('duty_perc'))
        super().__init__(*args, **kwargs)
        self.last_time = None

    def set_duty(self, duty=None):
        # Updates the duty cycle to a point in time where the switch
        # must occur
        if duty is not None:
            self.duty_perc = duty
        self.duty = self.duty_perc/100 * self.period

    def set_period(self, period):
        # Shift start point so that we know where in the new period we are.
        # Then, move period
        # "|-----X----------------|" punto % old_period
        # "|-----X----|-----------|" start = now - (punto % old_period)
        # "|----|X----|-----|-----|" 
        self.start = self.last_time - (self.timepoint() % self.period)
        print(period, self.start)
        self.period = period
        self.set_duty()

    def timepoint(self):
        return ((self.last_time - self.start) % self.period)

    def one_cycle(self, time):
        self.last_time = time
        return (self.timepoint() < self.duty) if (
            self.input < self.target) else False


def fixed_duty_wrapper(args):
    name, duty, period = stringify(args.car, quote=False), args.cdr.car, args.cdr.cdr.car
    print('name, duty, period', name, duty*100, period)
    return (name, FixedDutyCycle(
        target=None, # reach_period_s=60*60,
        duty_perc=duty*100, period=period,
        start_time=perf_counter()))