import pygame
from pygame.locals import *
import random

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')

font = pygame.font.SysFont('Bauhaus 93', 60)
white = (255, 255, 255)

#define game variables
ground_scroll = 0
scroll_speed = 4
fly = False
game_over = False
pipe_gap = 150
pipe_frequency = 1500
last_pipe = pygame.time.get_ticks() - pipe_frequency
score = 0
pass_pipe = False

#load images
bg = pygame.image.load('flappy_bird_project/img/bg.jpg')
ground_img = pygame.image.load('flappy_bird_project/img/ground.png')
button_img = pygame.image.load('flappy_bird_project/img/restart.png')

def draw_text(text, font, text_col, x, y):
    img = font.render(text, True, text_col)
    screen.blit(img, (x, y))

def reset_game():
    pipe_group.empty()
    flappy.rect.x = 100
    flappy.rect.y = int(screen_height / 2)
    score = 0
    return score


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"flappy_bird_project/img/bird{num}.jpg")
            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 fly == True:
            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:
            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

            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]

            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("flappy_bird_project/img/pipe.png")
        self.rect = self.image.get_rect()
        if position == 1:
            self.image = pygame.transform.flip(self.image, False, True)
            self.rect.bottomleft = [x, y - int(pipe_gap / 2)]
        if position == -1:
            self.rect.topleft = [x, y + int(pipe_gap / 2)]

    def update(self):
        self.rect.x -= scroll_speed
        if self.rect.right < 0:
            self.kill()

class Button():
    def __init__(self, x, y, image):
        self.image = image
        self.rect = self.image.get_rect()
        self.rect.topleft = (x, y)

    def draw(self):

        action = False

        pos = pygame.mouse.get_pos()
        if self.rect.collidepoint(pos):
            if pygame.mouse.get_pressed()[0] == 1:
                action = True
        screen.blit(self.image, (self.rect.x, self.rect.y))

        return action

bird_group = pygame.sprite.Group()
pipe_group = pygame.sprite.Group()

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

bird_group.add(flappy)

button = Button(screen_width // 2 - 50, screen_height // 2 - 100, button_img)

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)

        screen.blit(ground_img, (ground_scroll, 768))

        if len(pipe_group) > 0:
            if bird_group.sprites()[0].rect.left > pipe_group.sprites()[0].rect.left\
                and bird_group.sprites()[0].rect.right < pipe_group.sprites()[0].rect.right\
                and pass_pipe == False:
                pass_pipe = True
            if pass_pipe == True:
                if bird_group.sprites()[0].rect.left > pipe_group.sprites()[0].rect.right:
                    score += 1
                    pass_pipe = False

        draw_text(str(score), font, white, int(screen_width / 2), 20)

        if pygame.sprite.groupcollide(bird_group, pipe_group, False, False) or flappy.rect.top < 0:
            game_over = True

        if flappy.rect.bottom >= 768:
            game_over = True
            fly = False

        if game_over == False and fly == True:

            time_now = pygame.time.get_ticks()
            if time_now - last_pipe > pipe_frequency:
                pipe_height = random.randint(-100, 100)
                btm_pipe = Pipe(screen_width, int(screen_height / 2) + pipe_height, -1)
                top_pipe = Pipe(screen_width, int(screen_height / 2) + pipe_height, 1)
                pipe_group.add(btm_pipe)
                pipe_group.add(top_pipe)
                last_pipe = time_now
        #draw and scroll the ground
            ground_scroll -= scroll_speed
            if abs(ground_scroll) > 35:
                ground_scroll = 0

            pipe_group.update()

        if game_over == True:
            if button.draw() == True:
                game_over = False
                score = reset_game()

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

        pygame.display.update()

pygame.quit()