# import libraries
import pygame
from pygame.locals import *
from pygame import mixer
import pickle
from os import path

# initialize mixer and pygame
pygame.mixer.pre_init(44100, -16, 2, 512)
mixer.init()
pygame.init()

# setup clock and FPS
clock = pygame.time.Clock()
fps = 60

# screen size
screen_width = 1000
screen_height = 1000

# setup display and title
screen = pygame.display.set_mode((screen_width, screen_height))
pygame.display.set_caption('Underworld Castle')

# define fonts
font = pygame.font.SysFont('Impact', 70)
font_score = pygame.font.SysFont('Impact', 30)

# game variables
tile_size = 50
game_over = 0
main_menu = True
level = 0
max_levels = 7
score = 0

# colors
mid_blue = (32, 115, 188)

# load images
bg_img = pygame.image.load('img/bg.png')
title_img = pygame.image.load('img/title_art.png')
title_img = pygame.transform.scale(title_img, (600, 200))
restart_img = pygame.image.load('img/restart_btn.png')
start_img = pygame.image.load('img/start_btn.png')
exit_img = pygame.image.load('img/exit_btn.png')

# load and play background music
pygame.mixer.music.load('img/music.mp3')
pygame.mixer.music.play(-1, 0.0, 5000)

# load sound effects
coin_fx = pygame.mixer.Sound('img/runes.wav')
coin_fx.set_volume(0.5)
jump_fx = pygame.mixer.Sound('img/jump.wav')
jump_fx.set_volume(0.5)
game_over_fx = pygame.mixer.Sound('img/died.wav')
game_over_fx.set_volume(0.5)

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

# function to reset the level
def reset_level(level):
    player.reset(100, screen_height - 130)
    mushroom_group.empty()
    crates_group.empty()
    chemicals_group.empty()
    door_group.empty()
    runes_group.empty()
    runes_group.add(score_runes)

    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
    return None

# Button class
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

    def draw(self):
        action = False
        pos = pygame.mouse.get_pos()
        if self.rect.collidepoint(pos):
            if pygame.mouse.get_pressed()[0] == 1 and not self.clicked:
                action = True
                self.clicked = True
        if pygame.mouse.get_pressed()[0] == 0:
            self.clicked = False
        screen.blit(self.image, self.rect)
        return action

# Player class
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:
            key = pygame.key.get_pressed()

            # Jump
            if key[pygame.K_w] and not self.jumped and not self.in_air:
                jump_fx.play()
                self.vel_y = -15
                self.jumped = True
            if not key[pygame.K_w]:
                self.jumped = False

            # Walking animation + movement
            if key[pygame.K_a] or key[pygame.K_d]:
                self.counter += 1
                if self.counter > walk_cooldown:
                    self.counter = 0
                    self.index += 1
                    if self.index >= len(self.images_right):
                        self.index = 0

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

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

            # Collision with tiles
            self.in_air = True
            for tile in world.tile_list:
                if tile[1].colliderect(self.rect.x + dx, self.rect.y, self.width, self.height):
                    dx = 0
                if tile[1].colliderect(self.rect.x, self.rect.y + dy, self.width, self.height):
                    if self.vel_y < 0:
                        dy = tile[1].bottom - self.rect.top
                        self.vel_y = 0
                    elif self.vel_y >= 0:
                        dy = tile[1].top - self.rect.bottom
                        self.vel_y = 0
                        self.in_air = False

            # Enemy or hazard collision
            if pygame.sprite.spritecollide(self, mushroom_group, False) or pygame.sprite.spritecollide(self, chemicals_group, False):
                game_over = -1
                game_over_fx.play()

            # Door collision
            if pygame.sprite.spritecollide(self, door_group, False):
                game_over = 1

            # Moving platforms
            for platform in crates_group:
                if platform.rect.colliderect(self.rect.x + dx, self.rect.y, self.width, self.height):
                    dx = 0
                if platform.rect.colliderect(self.rect.x, self.rect.y + dy, self.width, self.height):
                    if abs((self.rect.top + dy) - platform.rect.bottom) < col_thresh:
                        self.vel_y = 0
                        dy = platform.rect.bottom - self.rect.top
                    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 position
            self.rect.x += dx
            self.rect.y += dy

        elif game_over == -1:
            self.image = self.dead_image
            draw_text('GAME OVER!', font, mid_blue, (screen_width // 2) - 150, screen_height // 2)
            if self.rect.y > 200:
                self.rect.y -= 5

        screen.blit(self.image, self.rect)
        return game_over


    def reset(self, x, y):
        self.images_right = []
        self.images_left = []
        self.index = 0
        self.counter = 0
        for num in range(1, 9):
            img_right = pygame.image.load(f'img/samurai{num}.png')
            img_right = pygame.transform.scale(img_right, (40, 80))
            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('img/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

# World class
class World():
    def __init__(self, data):
        self.tile_list = []
        block2_img = pygame.image.load('img/block2.png')
        row_count = 0
        for row in data:
            col_count = 0
            for tile in row:
                if tile in [1, 2]:
                    img = pygame.transform.scale(block2_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)
                elif tile == 3:
                    mushroom = Mushroom(col_count * tile_size, row_count * tile_size + 22)
                    mushroom_group.add(mushroom)
                elif tile == 4:
                    crates = Crates(col_count * tile_size, row_count * tile_size, 1, 0)
                    crates_group.add(crates)
                elif tile == 5:
                    crates = Crates(col_count * tile_size, row_count * tile_size, 0, 1)
                    crates_group.add(crates)
                elif tile == 6:
                    chemicals = Chemicals(col_count * tile_size, row_count * tile_size + (tile_size // 2))
                    chemicals_group.add(chemicals)
                elif tile == 7:
                    runes = Runes(col_count * tile_size + (tile_size // 2), row_count * tile_size + (tile_size // 2))
                    runes_group.add(runes)
                elif tile == 8:
                    door = Door(col_count * tile_size, row_count * tile_size - (tile_size // 2))
                    door_group.add(door)
                col_count += 1
            row_count += 1

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

# Sprite Classes
class Mushroom(pygame.sprite.Sprite):
    def __init__(self, x, y):
        super().__init__()
        self.image = pygame.image.load('img/mushroom.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
        if abs(self.move_counter) > 50:
            self.move_direction *= -1
            self.move_counter *= -1

class Crates(pygame.sprite.Sprite):
    def __init__(self, x, y, move_x, move_y):
        super().__init__()
        img = pygame.image.load('img/crates.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
        if abs(self.move_counter) > 50:
            self.move_direction *= -1
            self.move_counter *= -1

class Chemicals(pygame.sprite.Sprite):
    def __init__(self, x, y):
        super().__init__()
        img = pygame.image.load('img/chemicals.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 Runes(pygame.sprite.Sprite):
    def __init__(self, x, y):
        super().__init__()
        img = pygame.image.load('img/rune.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 Door(pygame.sprite.Sprite):
    def __init__(self, x, y):
        super().__init__()
        img = pygame.image.load('img/door.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

# initialize game objects
player = Player(100, screen_height - 130)
mushroom_group = pygame.sprite.Group()
crates_group = pygame.sprite.Group()
chemicals_group = pygame.sprite.Group()
runes_group = pygame.sprite.Group()
door_group = pygame.sprite.Group()
score_runes = Runes(tile_size // 2, tile_size // 2)
runes_group.add(score_runes)

# load level data
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)

# 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)

# main game loop
run = True
while run:
    clock.tick(fps)
    screen.blit(bg_img, (0, 0))

    if main_menu:
        screen.blit(title_img, (screen_width // 2 - 300, 100))
        if exit_button.draw():
            run = False
        if start_button.draw():
            main_menu = False
    else:
        world.draw()
        if game_over == 0:
            mushroom_group.update()
            crates_group.update()
            if pygame.sprite.spritecollide(player, runes_group, True):
                score += 1
                coin_fx.play()

        game_over = player.update(game_over)

        mushroom_group.draw(screen)
        crates_group.draw(screen)
        chemicals_group.draw(screen)
        runes_group.draw(screen)
        door_group.draw(screen)

        draw_text('X ' + str(score), font_score, mid_blue, tile_size - 10, 10)

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

        elif game_over == 1:
            level += 1
            if level <= max_levels:
                world_data = []
                world = reset_level(level)
                game_over = 0
            else:
                draw_text('YOU WIN!', font, mid_blue, (screen_width // 2) - 140, screen_height // 2)
                if restart_button.draw():
                    level = 1
                    score = 0
                    world_data = []
                    world = reset_level(level)
                    game_over = 0

    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            run = False

    pygame.display.update()

pygame.quit()