import bge
import random

def bird(cont):
    own = cont.owner
    if 'inited' not in own:
        own.worldPosition = own['start'].worldPosition
        own['inited'] = True        
        act = cont.actuators['Steering']
        act.target = own['end']
        act.velocity = 2
        cont.activate(act)
    if own.getDistanceTo(own['end']) < 1:
        own.endObject()

def main(cont, scene):
    def build_bird_list(scene,own):
        own['bird_list'] = []
        for x in scene.objects:
            if 'bird_target' in x.name:
                own['bird_list'].append(x)
                
    def do_birds(scene, own, cont):
        if own['bird_list'] != []:
            if own['life'] % 50 == 0:
                num = random.randint(0,2)
                if num == 1:
                    top = len(own['bird_list']) - 1
                    start = random.randint(0, top)
                    end = start
                    while end == start:
                        end = random.randint(0, top)
                    obj = scene.addObject('bird_cont', own['bird_list'][start], 0)                
                    obj['start'] = own['bird_list'][start]
                    obj['end'] = own['bird_list'][end]
                    obj.worldPosition = obj['start'].worldPosition
                
    def life(own):
        if 'life' in own:
            own['life'] += 1     
        else:
            own['life'] = 0    
        
    own = cont.owner
    if 'binited' not in own:
        build_bird_list(scene, own)            
        own['binited'] = True

    life(own)    
    do_birds(scene, own, cont)