import pygame
import button
import csv
import os.path as path

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

# game window
SCREEN_WIDTH = 800
SCREEN_HEIGHT = 640
LOWER_MARGIN = 100
SIDE_MARGIN = 300

screen = pygame.display.set_mode((SCREEN_WIDTH + SIDE_MARGIN, SCREEN_HEIGHT + LOWER_MARGIN))
pygame.display.set_caption('Level Editor')

# define game vars
ROWS = 16
MAX_COLS = 150
TILE_SIZE = SCREEN_HEIGHT // ROWS
TILE_TYPES = 11
level = 0
current_tile = 0
scroll_left = False
scroll_right = False
scroll = 0
scroll_speed = 1

# load images
bg_img = pygame.image.load('img/bg.png').convert_alpha()
# store tiles in list
img_list = []
for x in range(TILE_TYPES):
    img = pygame.image.load(f'img/tile/{x}.png')
    img = pygame.transform.scale(img, (TILE_SIZE, TILE_SIZE))
    img_list.append(img)

save_img = pygame.image.load('img/save_btn.png').convert_alpha()
load_img = pygame.image.load('img/load_btn.png').convert_alpha()

# define colors
GREEN = (144, 201, 120)
WHITE = (255, 255, 255)
RED = (200, 25, 25)

# define font
font = pygame.font.SysFont('Futura', 30)

# create empty tile list
world_data = []
for row in range(ROWS):
    r = [-1] * MAX_COLS
    world_data.append(r)

# create ground
for tile in range(0, MAX_COLS):
    world_data[ROWS - 1][tile] = 0

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

# drawing background function
def draw_bg():
    screen.fill(GREEN)
    width = bg_img.get_width()
    for x in range(4):
        screen.blit(bg_img, ((x * width) - scroll * 0.5, 0))

# draw gridlines
def draw_grid():
    # vertical lines
    for c in range(MAX_COLS + 1):
        pygame.draw.line(screen, WHITE, (c * TILE_SIZE - scroll, 0), (c * TILE_SIZE - scroll, SCREEN_HEIGHT))

    # horizontal lines
    for c in range(ROWS + 1):
        pygame.draw.line(screen, WHITE, (0, c * TILE_SIZE), (SCREEN_WIDTH, c * TILE_SIZE))

# drawing world tiles function
def draw_world():
    for y, row in enumerate(world_data):
        for x, tile in enumerate(row):
            if tile >= 0:
                screen.blit(img_list[tile], (x * TILE_SIZE - scroll, y * TILE_SIZE))

# create buttons
save_button = button.Button(SCREEN_WIDTH // 2, SCREEN_HEIGHT + LOWER_MARGIN - 50, save_img, 1)
load_button = button.Button(SCREEN_WIDTH // 2 + 200, SCREEN_HEIGHT + LOWER_MARGIN - 50, load_img, 1)

# make a list for the buttons
button_list = []
button_col = 0
button_row = 0
for i in range(len(img_list)):
    tile_button = button.Button(SCREEN_WIDTH + (75 * button_col) + 50, 75 * button_row + 50, img_list[i], 1)
    button_list.append(tile_button)
    button_col += 1
    if button_col == 3:
        button_row += 1
        button_col = 0

def save_level_data(filename, data):
    with open(filename, mode='w', newline='') as file:
        writer = csv.writer(file)
        writer.writerows(data)

def load_level_data(filename):
    data = []
    with open(filename, mode='r') as file:
        reader = csv.reader(file)
        for row in reader:
            data.append(list(map(int, row)))
    return data

run = True
while run:
    clock.tick(fps)

    draw_bg()
    draw_grid()
    draw_world()

    draw_text(f'Level: {level}', font, WHITE, 10, SCREEN_HEIGHT + LOWER_MARGIN - 90)
    draw_text('Press UP or DOWN to change level', font, WHITE, 10, SCREEN_HEIGHT + LOWER_MARGIN - 60)

    # save level data
    if save_button.draw(screen):
        # save level data
        save_level_data(f'level_data{level}.csv', world_data)
    
    if load_button.draw(screen):
        # load level data
        # reset scroll back to start of level
        scroll = 0
        world_data = load_level_data(f'level_data{level}.csv')

    # draw tile panel and tiles
    pygame.draw.rect(screen, GREEN, (SCREEN_WIDTH, 0, SIDE_MARGIN, SCREEN_HEIGHT))

    # choose a tile
    button_count = 0    
    for button_count, i in enumerate(button_list):
        if i.draw(screen):
            current_tile = button_count
    
    # highlight selected tile
    pygame.draw.rect(screen, RED, button_list[current_tile].rect, 3)

    # scroll map
    if scroll_left and scroll > 0:
        scroll -= 5 * scroll_speed
    if scroll_right and scroll < (MAX_COLS * TILE_SIZE) - SCREEN_WIDTH:
        scroll += 5 * scroll_speed

    # add new tiles to screen
    # get mouse pos
    pos = pygame.mouse.get_pos()
    x = (pos[0] + scroll) // TILE_SIZE
    y = pos[1] // TILE_SIZE

    # check if mouse is within tile area
    if pos[0] < SCREEN_WIDTH and pos[1] < SCREEN_HEIGHT:
        # update tile value
        if pygame.mouse.get_pressed()[0] == 1:
            if world_data[y][x] != current_tile:
                world_data[y][x] = current_tile
        if pygame.mouse.get_pressed()[2] == 1:
            world_data[y][x] = -1

    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            run = False
        # keypresses
        if event.type == pygame.KEYDOWN:
            if event.key == pygame.K_UP:
                level += 1
            if event.key == pygame.K_DOWN and level > 0:
                level -= 1
            if event.key == pygame.K_LEFT:
                scroll_left = True
            if event.key == pygame.K_RIGHT:
                scroll_right = True
            if event.key == pygame.K_LSHIFT:
                scroll_speed = 5

        if event.type == pygame.KEYUP:
            if event.key == pygame.K_LEFT:
                scroll_left = False
            if event.key == pygame.K_RIGHT:
                scroll_right = False
            if event.key == pygame.K_LSHIFT:
                scroll_speed = 1

    pygame.display.update()

pygame.quit()