#!/usr/bin/python3
import pygame
import pygame.gfxdraw
import copy
import random
pygame.init()
## funktionen
def get_debug_text():
    def text(text,line_counter):
        debug_text = default_font.render(str(text), True, (255,255,255))
        screen.blit(debug_text,(0,line_counter*default_font.get_height()))

    line_counter = 1
    globalvars = globals()
    for a in globalvars:
        text(f"{str(a)} = {str(globalvars[a])}",line_counter)
        line_counter += 1

def centered_text(text=str,pos=tuple,color=tuple):
    text = default_font.render(str(text), True, color,(255,255,255))
    screen.blit(text,(pos[0]-text.get_width()/2,pos[1]))

def draw_feld(feld,color_key,block_size):
    #print(feld)
    for a in range(len(feld[0])):
        for b in range(len(feld)):
            #print(a,b)
            if feld[b][a] == ".":
                
                print(".")
                #pygame.gfxdraw.box(screen,pygame.Rect(
                #              a*block_size[0],
                #              b*block_size[1],
                #              (a+1)*(block_size[0]),
                #              (b+1)*(block_size[1])),(100,100,100))
            else:
                #pygame.gfxdraw.box(screen,pygame.Rect(
                #              a*block_size[0],
                #              b*block_size[1],
                #              (a+1)*(block_size[0]),
                #              (b+1)*(block_size[1])),color_key[feld[b][a]])
                pygame.draw.rect(screen,color_key[feld[b][a]],
                                 (a*block_size[0],
                                  b*block_size[1],
                                  (a+1)*(block_size[0]),
                                  (b+1)*(block_size[1])))
def get_block_size():
    return 20,20

def verarbeite_feld(feld):
    feld2 = copy.deepcopy(feld)
    for y in range(len(feld)-1):
        for x in range(len(feld[0])-2):
            x += 1
            if feld[y][x] == "a":
                if feld[y+1][x] == " ":
                    feld2[y][x] = feld[y+1][x]
                    feld2[y+1][x] = feld[y][x]
                elif feld[y+1][x] == "#":
                    break
                elif feld2[y+1][x+1] == " " or  feld2[y+1][x-1] == " ":
                    # Überprüfen, seiten
                    direction = random.choice([-1, 1])  # Zufällige Auswahl der Richtung
                    if feld[y+1][x+direction] == " ":
                        feld2[y][x] = feld[y+1][x+direction]
                        feld2[y+1][x+direction] = feld[y][x]
                        break
                    else:
                        direction = -direction
                    if feld2[y+1][x+direction] == " ":
                        feld2[y][x] = feld[y+1][x+direction]
                        feld2[y+1][x+direction] = feld[y][x]
                        break
                    else:
                        feld2[y][x] = "."
                        
                else:
                    feld2[y][x] = "."
    return feld2

def make_feld(size):
    x = screensize[0]//size
    y = screensize[1]//size
    return [[" " for _ in range(x)] for _ in range(y)]
## klassen

        
## variablen
screen = pygame.display.set_mode((800,500),pygame.RESIZABLE)
pygame.display.set_caption("SAND")
screensize = pygame.display.get_window_size()
clock = pygame.time.Clock()
default_font = pygame.font.SysFont("sans", 14)
feld = make_feld(20)
acolor = (255,0,0)
wechselfarbe = "r"
using_element = "a"
pixelsize = 20

show_debug = False
running = True
if __name__ == "__main__":
    while running:
        ## key managment
        pressed_keys = pygame.key.get_pressed()

        if pressed_keys[pygame.K_ESCAPE]:
            exit()
        if pressed_keys[pygame.K_PLUS] and not preview_pressed_keys[pygame.K_PLUS]:
            pixelsize += 2
        if pressed_keys[pygame.K_MINUS] and not preview_pressed_keys[pygame.K_MINUS]:
            pixelsize -= 2
        if pressed_keys[pygame.K_d] and not preview_pressed_keys[pygame.K_d]:
            show_debug = not show_debug
        if pressed_keys[pygame.K_RETURN] and not preview_pressed_keys[pygame.K_RETURN]:
            if using_element == "a":
                using_element = "#"
            else:
                using_element = "a"
        if pressed_keys[pygame.K_r] and not preview_pressed_keys[pygame.K_r]:
            feld = make_feld(pixelsize)
            print("reset")

        preview_pressed_keys = pressed_keys
        ## event managment
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                exit()
            if event.type == pygame.WINDOWRESIZED:
                screensize = pygame.display.get_window_size()
                feld = make_feld(pixelsize)
        r,g,b = acolor
        if wechselfarbe == "r":
            r -= 1
            g += 1
            if r == 0:
                wechselfarbe = "g"
        if wechselfarbe == "g":
            g -= 1
            b += 1
            if g == 0:
                wechselfarbe = "b"
        if wechselfarbe == "b":
            b -= 1
            r += 1
            if b == 0:
                wechselfarbe = "r"
        acolor = r,g,b
        color_key = {" ":(0,0,0),
                     #".":(0,100,100,100),
                     "#":(100,100,100),
                     "a":acolor}
        draw_feld(feld,color_key,(pixelsize,pixelsize))
        mx,my = pygame.mouse.get_pos()
        mousepressed = pygame.mouse.get_pressed()[0]
        if mousepressed :
            feld[my//pixelsize][mx//pixelsize] = using_element
        
        preview_mousepressed = pygame.mouse.get_pressed()[0]
        feld = verarbeite_feld(feld)

        if show_debug:
            get_debug_text()
        ## bildschirm aktuallisierung
        pygame.display.flip()
        clock.tick(30)
        #screen.fill((100,0,0))