""" bank06: Many Random Customers """
from SimPy.Simulation import Simulation, Process, hold
from random import expovariate, seed


## Model components ------------------------
class Source(Process):
    """ Source generates customers at random """

    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))
            t = expovariate(1.0 / meanTBA)
            yield hold, self, t

class Customer(Process):
    """ Customer arrives, looks round and leaves """

    def visit(self, timeInBank=0):
        print("%7.4f %s: Here I am" % (self.sim.now(), self.name))
        yield hold, self, timeInBank
        print("%7.4f %s: I must leave" % (self.sim.now(), self.name))


## Model -----------------------------------
class BankModel(Simulation):
    def run(self, aseed):
        """ PEM """
        seed(aseed)
        s = Source(name='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 arrival interval, minutes
seedVal = 99999

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

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