import pygame
from pygame.locals import *

pygame.init()

clock = pygame.time.Clock()
fps = 60

screen_width = 864
screen_height = 936

screen = pygame.display.set_mode((screen_width, screen_height))
pygame.display.set_caption('Flappy Bird')


#define game variables
ground_scroll = 0
scroll_speed = 4
flying = False
game_over = False

#load images
bg = pygame.image.load('FlappyBird/background.png')
ground_img = pygame.image.load('FlappyBird/ground.png')


class Bird(pygame.sprite.Sprite):
	def __init__(self, x, y):
		pygame.sprite.Sprite.__init__(self)
		self.images = []
		self.index = 0
		self.counter = 0
		for num in range(1, 4):
			img = pygame.image.load(f'FlappyBird/bird{num}.png')
			self.images.append(img)
		self.image = self.images[self.index]
		self.rect = self.image.get_rect()
		self.rect.center = [x, y]
		self.vel = 0
		self.clicked = False

	def update(self):

		if flying == True:
			#gravity
			self.vel += 0.5
			if self.vel > 8:
				self.vel = 8
			if self.rect.bottom < 768:
				self.rect.y += int(self.vel)

		if game_over == False:
			#jump
			if pygame.mouse.get_pressed()[0] == 1 and self.clicked == False:
				self.clicked = True
				self.vel = -10
			if pygame.mouse.get_pressed()[0] == 0:
				self.clicked = False

			#handle the animation
			self.counter += 1
			flap_cooldown = 5

			if self.counter > flap_cooldown:
				self.counter = 0
				self.index += 1
				if self.index >= len(self.images):
					self.index = 0
			self.image = self.images[self.index]

			#rotate the bird
			self.image = pygame.transform.rotate(self.images[self.index], self.vel * -2)
		else:
			self.image = pygame.transform.rotate(self.images[self.index], -90)



class pipe(pygame.sprite.Sprite):
	def __init__(self, x, y, position):
		pygame.sprite.Sprite.__init__(self)
		self.image = pygame.image.load('FlappyBird/pipe.png')
		self.rect = self.image.get_rect()
		#position 1 is from the top, -1 is from the bottom
	

bird_group = pygame.sprite.Group()

pipe_group = pygame.sprite.Group()

flappy = Bird(100, int(screen_height / 2))

bird_group.add(flappy)

btm_pipe = pipe(300, int(screen_height / 2))
pipe_group.add(btm_pipe)


run = True
while run:

	clock.tick(fps)

	#draw background
	screen.blit(bg, (0,0))

	bird_group.draw(screen)
	bird_group.update()
	pipe_group.draw(screen)
	pipe_group.update()


	#draw the ground
	screen.blit(ground_img, (ground_scroll, 768))

	#check if bird has hit the ground
	if flappy.rect.bottom > 768:
		game_over = True
		flying = False


	if game_over == False:
		#draw and scroll the ground
		ground_scroll -= scroll_speed
		if abs(ground_scroll) > 35:
			ground_scroll = 0


	for event in pygame.event.get():
		if event.type == pygame.QUIT:
			run = False
		if event.type == pygame.MOUSEBUTTONDOWN and flying == False and game_over == False:
			flying = True

	pygame.display.update()

pygame.quit()