#imports libraries
import pygame, os, sys
from pygame.locals import *
 
#variables

a = 0

background = os.path.join(os.path.dirname(__file__), 'starfield1.bmp')
#player ship graphic
ship = os.path.join(os.path.dirname(__file__), 'pship.bmp')
#enemy ship graphic
eship = os.path.join(os.path.dirname(__file__), 'eship.bmp')

lives = 3
printlives = 'Lives:'

pygame.init()
 
#the window
window = pygame.display.set_mode ((800, 600))
pygame.display.set_caption('Galaga!')
surface = pygame.display.get_surface()

#creating the surface
screen = pygame.image.load (background).convert()

#create player ship
playership = pygame.image.load (ship).convert()
#create enemy ship
enemyship = pygame.image.load (eship).convert()
#to print "lives:" in botom left hand corner and update the number of lives the player has

#NOT WORKING
def lives(lives):
	surface.blit (printlives, (600,0))
#play position variables	
sposx = 374
sposy = 512
#enemy position variable
eposx = 10
eposy = 55	
#initializes the clock
clock = pygame.time.Clock()
	
#Draws the players ship on the surface and controls movement of the ship and fireing	
def pship(sposx, sposy):
	surface.blit (playership, (sposx, sposy))
	return sposx, sposy
#draws the enemy ship on the surface and controls movement
def eship(eposx, eposy):
	surface.blit (enemyship, (eposx, eposy))
	return eposx, eposy
def emove():
	global eposx
	clock.tick(40)
	if eposx < 800:
			eposx = eposx + 10
	
def input(events):
	global sposx
	for event in events:
		if event.type == QUIT:
			sys.exit(0)
		if event.type == pygame.KEYDOWN:
			if event.key == pygame.K_LEFT:
				sposx = sposx - 10
			if event.key == pygame.K_RIGHT:
				sposx = sposx + 10
		else:
			print event


while True:
	
	surface.blit (screen, (10,0))
	pship(sposx, sposy)
	eship(eposx, eposy)
	emove()
	input (pygame.event.get())
	pygame.display.flip()