#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
live3 = os.path.join(os.path.dirname(__file__), 'live3.bmp')
live2 = os.path.join(os.path.dirname(__file__), 'live2.bmp')
live1 = os.path.join(os.path.dirname(__file__), 'live1.bmp')


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

#the lives gui
lives3 = pygame.image.load(live3).convert()
lives2 = pygame.image.load(live2).convert()
lives1 = pygame.image.load(live1).convert()

#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


def lives(lives):
	lives = 3
	if lives == 3:
		surface.blit (lives3, (50,550))
	if lives == 2:
		surface.blit (lives2, (50,550))
	if lives == 1:
		surface.blit (lives1, (50,550))
		
#play position variables	
sposx = 374
sposy = 512
#enemy position variable
eposx = 760
eposy = 55	
xmax = 750
xmin = 25
#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))
	
vel = 1
dir = 0
def move():
	global eposx
	global vel
	global dir
	
	
	if eposx >= xmin:
		dir = 1
	else:
		dir = 0
	if dir == 1:
		eposx = eposx - vel
	elif dir == 0:
		vel = -1
		if eposx <= xmax:
			eposx = eposx - vel
	
def emove():
	global xmax
	global xmin
	
	clock.tick(70)
	move()
	
	
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))
	lives(lives)
	pship(sposx, sposy)
	eship(eposx, eposy)
	emove()
	
	
	input (pygame.event.get())
	pygame.display.flip()