import pygame, sys, pickle
from pygame.locals import *
from pygame import mixer
from os import path

pygame.mixer.pre_init(44100, -16, 2, 512)
mixer.init()
pygame.init()
clock = pygame.time.Clock()
fps = 60
screen_width, screen_height = 1000, 1000

screen = pygame.display.set_mode((screen_width,screen_height))
pygame.display.set_caption("Platformer")

#define font
font = pygame.font.SysFont("bauhaus 93", 70)
font_score = pygame.font.SysFont("bauhaus 93", 30)

#define variables
tile_size = 50
game_over = 0
main_menu = True
level = 3
max_level = 7
score = 0

#define colours
white = (255,255,255)
blue = (0,0,255)

#load images
pygame.mixer.music.load("animation/music.wav")
pygame.mixer.music.play(-1, 0.0, 5000)
sun_img = pygame.image.load("animation/sun.png")
bg_img = pygame.image.load("animation/sky.png")
restart_img = pygame.image.load("animation/restart_btn.png")
start_img = pygame.image.load("animation/start_btn.png")
exit_img = pygame.image.load("animation/exit_btn.png")


#load sounds
coin_fx = pygame.mixer.Sound("animation/coin.wav")
coin_fx.set_volume(0.5)
jump_fx = pygame.mixer.Sound("animation/jump.wav")
jump_fx.set_volume(0.5)
game_over_fx = pygame.mixer.Sound("animation/game_over.wav")
game_over_fx.set_volume(0.5)

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

#function to reset level
def reset_level(level):
    player.reset(100, screen_height - 130)
    blob_group.empty()
    lava_group.empty()
    exit_group.empty()
    #load in level data and create world
    if path.exists(f'level{level}_data'):
        pickle_in = open(f'level{level}_data', 'rb')
        world_data = pickle.load(pickle_in)
    world = World(world_data)

    return world



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


    #draw button
    def draw(self):
        action = False
        #get mouse postion
        pos = pygame.mouse.get_pos()
        
        #check mouseover and clicked conditions
        if self.rect.collidepoint(pos):
            #[0] is which mouse button is being clicked
            if pygame.mouse.get_pressed()[0] and self.clicked == False:
                action = True
                self.clicked = True
        if pygame.mouse.get_pressed()[0] == 0:
            self.clicked = False

        
        #draw button
        screen.blit(self.image, self.rect)

        return action





class Player():
    def __init__(self, x, y):
        self.reset(x,y)

    def update(self, game_over):

        dx = 0
        dy = 0
        walk_cooldown = 5
        col_thresh = 20

        if game_over == 0:
        #clactulate new player position
        #check collision at new position
        #adjust player position
        #get key presses
            key = pygame.key.get_pressed()
            if key[pygame.K_SPACE] and self.jumped == False and self.in_air == False:
                jump_fx.play()
                self.vel_y = -15
                self.jumped = True
            if key[pygame.K_SPACE] == False:
                self.jumped = False

            if key[pygame.K_a]:
                self.direction = 1
                self.counter += 1
                dx -=5
            if key[pygame.K_d]:
                self.direction = -1
                self.counter += 1
                dx += 5            
            if key[pygame.K_d] == False and key[pygame.K_a] == False:
                self.counter = 0
                self.index = 0
            if self.direction == -1:
                self.image = self.images_right[self.index]
            if self.direction == 1:
                self.image = self.images_left[self.index]

            
            #handle animation
            if self.counter > walk_cooldown:
                self.counter = 0
                self.index += 1
                if self.index >= len(self.images_right):
                    self.index = 0
                if self.direction == -1:
                    self.image = self.images_right[self.index]
                if self.direction == 1:
                    self.image = self.images_left[self.index]

            #add gravity
            self.vel_y += 1
            if self.vel_y > 10:
                self.vel_y = 10
            dy += self.vel_y

            #check for collision
            self.in_air = True
            for tile in world.tile_list:
                #check for collison in x
                if tile[1].colliderect(self.rect.x + dx, self.rect.y, self.width, self.height):
                    dx = 0
                #check for collision in y
                if tile[1].colliderect(self.rect.x, self.rect.y + dy, self.width, self.height):
                    #check if below ground i.e jumping
                    if self.vel_y < 0 :
                        dy = tile[1].bottom - self.rect.top
                        self.vel_y = 0
                #check if below ground i.e falling
                    elif self.vel_y >= 0 :
                        dy = tile[1].top - self.rect.bottom
                        self.vel_y = 0
                        self.in_air = False
            

            #three arguments, self(player), group/sprite, delete item?
            #check for collision with ememys
            if pygame.sprite.spritecollide(self, blob_group, False):
                game_over = - 1
                game_over_fx.play()

            #check for collision with Lava
            if pygame.sprite.spritecollide(self, lava_group, False):
                game_over = - 1
                game_over_fx.play()

            #check for collision with Lava
            if pygame.sprite.spritecollide(self, exit_group, False):
                game_over =  1

            #check for collision with platforms
            for platform in platform_group:
                #collision in the x direction
                if platform.rect.colliderect(self.rect.x + dx, self.rect.y, self.width, self.height):
                    dx = 0
                #collision with the y direction
                if platform.rect.colliderect(self.rect.x, self.rect.y + dy, self.width, self.height):
                    #check if below platform
                    if abs((self.rect.top + dy) - platform.rect.bottom) < col_thresh:
                        self.vel_y = 0
                        dy = platform.rect.bottom - self.rect.top
                    #check if above platform
                    elif abs((self.rect.bottom + dy) - platform.rect.top) < col_thresh:
                        self.rect.bottom = platform.rect.top - 1
                        self.in_air = False
                        dy = 0

                    if platform.move_x != 0:
                        self.rect.x += platform.move_direction


            #update player cords
            self.rect.x += dx
            self.rect.y += dy

        elif game_over == -1:
            self.image = self.dead_image
            draw_text("GAME OVER!", font, blue, (screen_width // 2) - 200, screen_height // 2)
            if self.rect.y > 200:
                self.rect.y -= 5

        #draw player onto screen
        #two arguments, image, coordinates
        screen.blit(self.image, self.rect)
        pygame.draw.rect(screen, (255, 255, 255), self.rect, 2)

        return game_over

    def reset(self, x, y):
        self.images_right =  []
        self.images_left =  []
        self.index = 0
        self.counter = 0
        #right animation
        for num in range(1,5):
            img_right = pygame.image.load(f"animation/guy{num}.png")
            img_right = pygame.transform.scale(img_right, (40,80))
            #flip on X axis, flip on Y axis
            img_left = pygame.transform.flip(img_right, True, False)
            self.images_right.append(img_right)
            self.images_left.append(img_left)
        self.dead_image = pygame.image.load("animation/ghost.png")
        self.image = self.images_right[self.index]
        self.rect = self.image.get_rect()
        self.rect.x = x
        self.rect.y = y
        self.width = self.image.get_width()
        self.height = self.image.get_height()
        self.vel_y = 0
        self.jumped = False
        self.direction = 0
        self.in_air = True



class World():
    def __init__(self, data):
        self.tile_list = []


        #load images
        dirt_img = pygame.image.load("animation/dirt.png")
        grass_img = pygame.image.load("animation/grass.png")


        row_count = 0
        for row in data:
            col_count = 0
            for tile in row:
                if tile == 1:
                    img = pygame.transform.scale(dirt_img, (tile_size, tile_size))
                    img_rect = img.get_rect()
                    img_rect.x = col_count * tile_size
                    img_rect.y = row_count * tile_size
                    tile = (img, img_rect)
                    self.tile_list.append(tile)
                if tile == 2:
                    img = pygame.transform.scale(grass_img, (tile_size, tile_size))
                    img_rect = img.get_rect()
                    img_rect.x = col_count * tile_size
                    img_rect.y = row_count * tile_size
                    tile = (img, img_rect)
                    self.tile_list.append(tile)
                if tile ==3:
                    blob = Enemy(col_count * tile_size, row_count * tile_size + 15)
                    blob_group.add(blob)
                if tile == 4:
                    #x cord, y cord, times drection by move_x, times direction by move_y
                    platfrom = Platform(col_count * tile_size, row_count * tile_size, 1, 0)
                    platform_group.add(platfrom)
                if tile == 5:
                    platfrom = Platform(col_count * tile_size, row_count * tile_size, 0, 1)
                    platform_group.add(platfrom)
                if tile == 6:
                    lava = Lava(col_count * tile_size, row_count * tile_size + (tile_size//2))
                    lava_group.add(lava)
                if tile == 7:
                    coin = Coin(col_count * tile_size + (tile_size // 2), row_count * tile_size + (tile_size//2))
                    coin_group.add(coin)
                if tile == 8:
                    exit = Exit(col_count * tile_size, row_count * tile_size - (tile_size // 2 ))
                    exit_group.add(exit)
                col_count += 1
            row_count += 1

    def draw(self):
        for tile in self.tile_list:
            screen.blit(tile[0], tile[1])

#sprites have draw function built in
class Enemy(pygame.sprite.Sprite):
    def __init__(self, x, y):
        pygame.sprite.Sprite.__init__(self)
        self.image = pygame.image.load("animation/blob.png")
        self.rect = self.image.get_rect()
        self.rect.x = x
        self.rect.y = y
        self.move_direction = 1
        self.move_counter = 0

    def update(self):
        self.rect.x += self.move_direction
        self.move_counter += 1
        #abs makes negative to absolute also postive
        if abs(self.move_counter) > 50:
            self.move_direction *= -1
            self.move_counter *= -1

class Platform(pygame.sprite.Sprite):
        def __init__(self, x, y, move_x, move_y):
            pygame.sprite.Sprite.__init__(self)
            img = pygame.image.load("animation/platform.png")
            self.image = pygame.transform.scale(img, (tile_size, tile_size // 2))
            self.rect = self.image.get_rect()
            self.rect.x = x
            self.rect.y = y
            self.move_counter = 0
            self.move_direction = 1
            self.move_x = move_x
            self.move_y = move_y


        def update(self):
            self.rect.x += self.move_direction * self.move_x
            self.rect.y += self.move_direction * self.move_y
            self.move_counter += 1
            #abs makes negative to absolute also postive
            if abs(self.move_counter) > 50:
                self.move_direction *= -1
                self.move_counter *= -1


class Lava(pygame.sprite.Sprite):
        def __init__(self, x, y):
            pygame.sprite.Sprite.__init__(self)
            img = pygame.image.load("animation/lava.png")
            self.image = pygame.transform.scale(img, (tile_size, tile_size // 2 ))
            self.rect = self.image.get_rect()
            self.rect.x = x
            self.rect.y = y

class Coin(pygame.sprite.Sprite):
        def __init__(self, x, y):
            pygame.sprite.Sprite.__init__(self)
            img = pygame.image.load("animation/coin.png")
            self.image = pygame.transform.scale(img, (tile_size // 2, tile_size // 2 ))
            self.rect = self.image.get_rect()
            self.rect.center = (x, y)

class Exit(pygame.sprite.Sprite):
        def __init__(self, x, y):
            pygame.sprite.Sprite.__init__(self)
            img = pygame.image.load("animation/exit.png")
            self.image = pygame.transform.scale(img, (tile_size, int(tile_size * 1.5 )))
            self.rect = self.image.get_rect()
            self.rect.x = x
            self.rect.y = y

player = Player(100, screen_height - 130)

blob_group = pygame.sprite.Group()
platform_group = pygame.sprite.Group()
lava_group = pygame.sprite.Group()
coin_group = pygame.sprite.Group()
exit_group = pygame.sprite.Group()

#create dummy coin for showing score
score_coin = Coin(tile_size//2, tile_size//2)
coin_group.add(score_coin)

#load level data create world
if path.exists(f'level{level}_data'):
    pickle_in = open(f'level{level}_data', 'rb')
world_data = pickle.load(pickle_in)
world = World(world_data)

#create buttons
restart_button = Button(screen_width // 2 - 50, screen_height // 2 - 100, restart_img)
start_button = Button(screen_width // 2 - 350, screen_height // 2, start_img)
exit_button = Button(screen_width // 2 + 150, screen_height // 2, exit_img)

#while is True game is running
run = True
while run:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            run = False

    screen.blit(bg_img, (0,0))
    screen.blit(sun_img,(100,100))

    if main_menu == True:
        if exit_button.draw():
            run = False
        if start_button.draw():
            main_menu = False
    else:
        world.draw()

        if game_over == 0:
            blob_group.update()
            platform_group.update()
            #update score
            #check if coin has been collected
            #first thing coliding, colliding against, do kill(delete after collsion)
            if pygame.sprite.spritecollide(player, coin_group, True):
                score += 1
                coin_fx.play()
            draw_text(str(score), font_score, white, tile_size - 10, 10)



        blob_group.draw(screen)
        platform_group.draw(screen)
        lava_group.draw(screen)
        coin_group.draw(screen)
        exit_group.draw(screen)

        game_over = player.update(game_over)

        #if player has died
        if game_over == -1:
            if restart_button.draw():
                world_data = []
                world = reset_level(level)
                game_over = 0
                score = 0

        #if player have completed he level
        if game_over == 1:
            #reset game and increase level
            level += 1
            if level <= max_level:
                #reset level
                world_data = []
                world = reset_level(level)
                game_over = 0
            else:
                draw_text("YOU WIN!", font, blue, (screen_width // 2) - 140, screen_height // 2)
                #restart game
                if restart_button.draw():
                    level = 1
                    world_data = []
                    world = reset_level(level)
                    game_over = 0
                    score = 0

    pygame.display.update()
    clock.tick(fps)

pygame.quit()