from itertools import product
from enum import Enum, auto

from pygame import Surface, Rect, image

from engine.entity import Entity
from engine.resources import res
from engine.servers.graphics import GraphicsServer
from engine.components.collide_rect import CollideRect
from engine.components.sprite import Sprite

from .common import S, Direction
from .pacdot import PacDot, EnsmallmentDot


class Node():
    cpt = 0

    def __init__(self):
        self.id = self.__class__.cpt
        self.__class__.cpt += 1
        self.neighbors = [None for dir in Direction]

    @property
    def children(self):
        children = []
        for direction in Direction:
            node = self.neighbors[direction.value]
            if node is not None:
                children.append((node, direction))
        return children


class Level(Entity):
    class Tile(Enum):
        AIR = auto()
        WALL = auto()

    def __init__(self, path):
        super().__init__('level')
        self.path = path

    colors = {(0, 0, 0): Tile.AIR,        # empty
              (0, 0, 255): Tile.WALL,     # wall
              (255, 0, 0): Tile.AIR,      # tele
              (255, 255, 0): Tile.WALL,   # idk
              (255, 0, 255): Tile.WALL,   # inside cage
              (0, 255, 0): Tile.WALL,     # cage entrance
              (0, 255, 255): Tile.WALL,   # cage wall
              (139, 139, 139): Tile.AIR,  # pac-dot
              (193, 193, 193): Tile.AIR}  # ensmallment dot

    def load(self):
        desc = image.load(res(self.path))
        w, h = desc.get_size()
        GraphicsServer().resize((w * S, h * S))
        self.surf = Surface((w * S, h * S)).convert()
        self.surf.fill((0, 0, 0))
        wall = Surface((S, S)).convert()
        wall.fill((0, 0, 255))
        self.graph = [[None for x in range(w)] for y in range(h)]
        for x, y in product(range(w), range(h)):
            col = desc.get_at((x, y))[:3]

            if Level.colors[col] == Level.Tile.AIR:
                self.graph[y][x] = Node()
            elif Level.colors[col] == Level.Tile.WALL:
                self.add(CollideRect(Rect(x * S, y * S, S, S)))
                wall.fill(col)
                self.surf.blit(wall, (x * S, y * S))

            if col == (139, 139, 139):  # pac-dot
                pc = PacDot()
                pc.x = x * S
                pc.y = y * S
                self.scene.add(pc)
                PacDot.tot += 1
            elif col == (193, 193, 193):  # ensmallment dot
                pc = EnsmallmentDot()
                pc.x = x * S
                pc.y = y * S
                self.scene.add(pc)
        self.add(Sprite(self.surf, 0))
        for y, line in enumerate(self.graph):
            for x, node in enumerate(line):
                if node is None:
                    continue
                node.neighbors[Direction.LEFT.value] = \
                    self.graph[y][(x-1) % w]
                node.neighbors[Direction.RIGHT.value] = \
                    self.graph[y][(x+1) % w]
                node.neighbors[Direction.UP.value] = \
                    self.graph[(y-1) % h][x]
                node.neighbors[Direction.DOWN.value] = \
                    self.graph[(y+1) % h][x]