"""bank14: *waituntil* the Bank door opens"""
from SimPy.Simulation import *
from random import expovariate, seed

## Model components ------------------------

door = 'Shut'


def dooropen():
    return door == 'Open'


class Doorman(Process):
    """ Doorman opens the door"""
    def openthedoor(self):
        """ He will open the door when he arrives"""
        global door
        yield hold, self, expovariate(1.0 / 10.0)
        door = 'Open'
        print("%7.4f Doorman: Ladies and "\
              "Gentlemen! You may all enter." % (now()))


class Source(Process):
    """ Source generates customers randomly"""
    def generate(self, number, rate):
        for i in range(number):
            c = Customer(name="Customer%02d" % (i))
            activate(c, c.visit(timeInBank=12.0))
            yield hold, self, expovariate(rate)


class Customer(Process):
    """ Customer arrives, is served and leaves """
    def visit(self, timeInBank=10):
        arrive = now()

        if dooropen():
            msg = ' and the door is open.'
        else:
            msg = ' but the door is shut.'
        print("%7.4f %s: Here I am%s" % (now(), self.name, msg))

        yield waituntil, self, dooropen

        print("%7.4f %s: I can  go in!" % (now(), self.name))
        wait = now() - arrive
        print("%7.4f %s: Waited %6.3f" % (now(), self.name, wait))

        yield request, self, counter
        tib = expovariate(1.0 / timeInBank)
        yield hold, self, tib
        yield release, self, counter

        print("%7.4f %s: Finished    " % (now(), self.name))

## Experiment data -------------------------

maxTime = 2000.0   # minutes
counter = Resource(1, name="Clerk")

## Model  ----------------------------------


def model(SEED=393939):
    seed(SEED)

    initialize()
    door = 'Shut'
    doorman = Doorman()
    activate(doorman, doorman.openthedoor())
    source = Source()
    activate(source,
             source.generate(number=5, rate=0.1), at=0.0)
    simulate(until=400.0)

## Experiment  ----------------------------------

model()