""" bank07_OO: One Counter,random arrivals """
from SimPy.Simulation import Simulation, Process, hold, Resource, request, release
from random import expovariate, seed

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

class Source(Process):
    """ Source generates customers randomly """

    def generate(self, number, meanTBA):
        for i in range(number):
            c = Customer(name="Customer%02d" % (i), sim=self.sim)
            self.sim.activate(c, c.visit(timeInBank=12.0,
                               res=self.sim.k))
            t = expovariate(1.0 / meanTBA)
            yield hold, self, t


class Customer(Process):
    """ Customer arrives, is served and  leaves """

    def visit(self, timeInBank=0, res=None):
        arrive = self.sim.now()       # arrival time
        print("%8.3f %s: Here I am" % (self.sim.now(), self.name))

        yield request, self, res
        wait = self.sim.now() - arrive  # waiting time
        print("%8.3f %s: Waited %6.3f" % (self.sim.now(), self.name, wait))
        yield hold, self, timeInBank
        yield release, self, res

        print("%8.3f %s: Finished" % (self.sim.now(), self.name))

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

class BankModel(Simulation):
    def run(self, aseed):
        """ PEM """
        seed(aseed)
        self.k = Resource(name="Counter", unitName="Clerk", sim=self)
        s = Source('Source', sim=self)
        self.activate(s, s.generate(number=maxNumber, meanTBA=ARRint), at=0.0)
        self.simulate(until=maxTime)

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

maxNumber = 5
maxTime = 400.0  # minutes
ARRint = 10.0    # mean, minutes
seedVal = 99999

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

mymodel = BankModel()
mymodel.run(aseed=seedVal)