#this is basicly a galaga clone.
import os, sys, time, pygame


#setup pygame window
pygame.init()

windowSize = (800,600)
screen = pygame.display.set_mode(windowSize)
pygame.key.set_repeat(25,25)

###################################

#load all images to memory
backGround = pygame.image.load("bg.png").convert()

#######################################
#global variables
loopVar = 1

Deathwait = 300
StartGameWait = 10000
Clock = pygame.time.Clock()

###################################
#dictionary so my classes can share objects
objDict = {}
###################################

#enemy AI
class Enemy(pygame.sprite.Sprite):
    def __init__(self): #instance the classes

        self.x = 400 #enemy coordinates
        self.y = 45
        self.MoveSpeed = .5 #speed of enemy ship
        self.Direction = 1 #direction of enemy ship 0 is left 1 is right 2 is null
        self.prevDirection = 0 # keep track of previous direction

        #lets make this a sprite
        self.image = pygame.image.load ("enemyA.png").convert()
        self.rect = self.image.get_rect()
        self.rect.topleft = (self.x,self.y)

        #enemy projectile stuff
        objDict["eShell"] = eShell()
        objDict["eShell"].shellx = self.x
        objDict["eShell"].shelly = self.y
        self.hasShot = False
        self.shellInAir = False
        self.shellVelocity = 5

    def move(self):
        if self.x >= 15 and self.prevDirection == 1: #if determines previous direction and new direction
            self.Direction = 0
            if self.x <= 15:
                self.prevDirection = 0

        elif self.x <= 760 and self.prevDirection == 0:
            self.Direction = 1
            if self.x >= 760:
                self.prevDirection = 1

    #move the enemy in the appropriate direction
        if self.Direction == 0:
            self.x = self.x - self.MoveSpeed
            self.rect.topleft = (self.x,self.y)

        elif self.Direction == 1:
            self.x = self.x + self.MoveSpeed
            self.rect.topleft = (self.x,self.y)

    #enemy combat
    def shoot(self):

        self.hasShot = True #did we shoot? is the shell still traveling?

        if self.hasShot == True and self.shellInAir == False:
            objDict["Shell"].shelly = objDict["eShell"].shelly - self.shellVelocity
            self.shellInAir = True

    def willShoot(self, t): #will i shoot at the player?
        if t == self.x and self.hasShot == False:
            self.shoot()
#################################

#player class
class Player(pygame.sprite.Sprite):
    def __init__(self):

        self.x = 400 #coordinates of player
        self.y =550

        objDict["pShell"].shellx = self.x #initial positioning of projectile
        objDict["pShell"].shelly = self.y
        self.shellVelocity = 5
        self.hasShot = False
        self.shellInAir = False

        #lets make this a sprite
        self.image = pygame.image.load ("ship.png").convert()
        self.rect = self.image.get_rect()
        self.rect.topleft = (self.x,self.y)

        self.maxX = 760 #maximum distance to right
        self.minX = 15  #minmum distance to left
        self.MoveSpeed = 5 # player move speed

    def input(self):

        for event in pygame.event.get(): #this si the stuff that makes the window closable

            if event.type == pygame.QUIT:
                exit()

            elif event.type == pygame.KEYDOWN:  #this is our basic movement with arrows left and right
                if event.key == pygame.K_LEFT and self.x >= self.minX:
                    self.x = self.x - self.MoveSpeed
                    self.rect.topleft = (self.x,self.y)
                if event.key == pygame.K_RIGHT and self.x <= self.maxX:
                    self.x = self.x + self.MoveSpeed
                    self.rect.topleft = (self.x,self.y)

                if event.key == pygame.K_SPACE and self.shellInAir == False:
                    self.shoot()

    def shoot(self):

        self.hasShot = True #did we shoot? is the shell still traveling?

        if self.hasShot == True and self.shellInAir == False:
            objDict["pShell"].shelly = objDict["pShell"].shelly - self.shellVelocity
            self.shellInAir = True
##########################

#shell classes to keep track of projectiles
class pShell(pygame.sprite.Sprite):
    def __init__():
        self.shellx = objDict["playerA"].x + 6 #the initial placement of the shell
        self.shelly = objDict["playerA"].y - 20
        #lets make this a sprite
        self.image = pygame.image.load ("pShellA.png").convert()
        self.rect = self.image.get_rect()
        self.rect.topleft = (self.shellx,self.shelly)


#the enemy shell sprite
class eShell(pygame.sprite.Sprite):
    def __init__():
        self.shellx = objDict["enemyA"].x + 6 #the initial placement of the shell
        self.shelly = objDict["enemyA"].y + 20
        #lets make this a sprite
        self.image = pygame.image.load ("eShellA.png").convert()
        self.rect = self.image.get_rect()
        self.rect.topleft = (self.shellx,self.shelly)
###############################

#the game class
class Game():
    #instance the game classes
    def __init__(self):
        objDict["enemyA"] = Enemy() #storing Enemy() as an element in a dict to use everywhere
        objDict["playerA"] = Player()

        self.PlayerDead = False
        self.EnemyDead = False

        objDict["pShell"] = pShell(self)

        #delay before gameplay begins
        Clock.tick(StartGameWait)

        while loopVar == 1:

            self.playerA.input()
            self.enemyA.move() #move the enemy to align with the player's x coordinate
            self.enemyA.willShoot(self.playerA.x) #if the enemy has a shot he will take it.

            self.update()
            #fpsClock.tick(FPS) #waits
    def combat(self):
        #keep track of player shell
        if self.playerA.shellInAir:
            screen.blit(self.pShell.image,(self.pShell.rect))
            self.playerA.shelly = self.playerA.shelly - self.playerA.shellVelocity

            if self.playerA.shelly <= 0: #is the shell at the top of the screen?
                self.playerA.shellInAir = False
                self.playerA.hasShot = False
            #keep track of enemy shell
        if self.enemyA.shellInAir:
            screen.blit(self.eShell.image,(self.eShell.rect))
            self.enemyA.shelly = self.enemyA.shelly + self.enemyA.shellVelocity

            if self.enemyA.shelly >= 600: #is the shell at the top of the screen?
                self.enemyA.shellInAir = False
                self.enemyA.hasShot = False

    def hitCheck(self):
        #lets see if the bullet hit the enemy
        if self.pShell.rect.colliderect(self.enemyA.rect) and self.playerA.shellInAir:
            print ("enemy has been hit!")
        #check to see if enemy shot player
        if self.eShell.rect.colliderect(self.playerA.rect) and self.enemyA.shellInAir:
            print ("player has been hit!")

    #setup the game board
    def update(self):

        screen.blit(backGround, (0,0))
        screen.blit(self.playerA.image,(self.playerA.rect)) #draw player ship in initial spot
        screen.blit(self.enemyA.image,(self.enemyA.rect)) #draw enemy ship in initial position

        self.combat()
        self.hitCheck()

        pygame.display.update()

#the actual game takes place below
game = Game()