import pyglet
from pyglet.window import key

import re

import sys
import random

# constants
TILE_SIZE_X = 16
TILE_SIZE_Y = 16

MIN_LEAF_SIZE = 8


class Leaf:
    """  Leaf of the BSP """

    def __init__(self, x, y, w, h, id):
        self.id = id
        self.x = x
        self.y = y
        self.width = w
        self.height = h
        self.left_leaf = None
        self.right_leaf = None

    def print_leaf(self):
        print('[Leaf]' + str(self.id) + ': (' + str(self.x) + '), (' + str(self.y) + ')' +
              ' - ' + str(self.width) + 'x' + str(self.height))

    def is_terminal(self):
        """ Returns True if the leave has no children """
        if self.left_leaf or self.right_leaf:
            return False
        return True

    def split(self):
        """
        :return: True if the leaf has been split
        """

        # self.print_leaf()
        # choose direction
        # TODO: if leaf is not so square, split along the long side
        # if width > XX% height (25, 33 ?) -> split vertical
        if random.random() < 0.5:
            # x
            if self.width < MIN_LEAF_SIZE * 2:  # leaf is too small
                return False
            split_point = random.randint(MIN_LEAF_SIZE, self.width - MIN_LEAF_SIZE)
            self.left_leaf = Leaf(self.x, self.y, split_point, self.height, self.id+1)
            self.right_leaf = Leaf(self.x + split_point, self.y, self.width - split_point, self.height, self.id+2)

        else:
            # y
            if self.height < MIN_LEAF_SIZE * 2:     # leaf is too small
                return False
            split_point = random.randint(MIN_LEAF_SIZE, self.height - MIN_LEAF_SIZE)
            self.left_leaf = Leaf(self.x, self.y, self.width, split_point, self.id+1)
            self.right_leaf = Leaf(self.x, self.y + split_point, self.width, self.height - split_point, self.id+2)

        return True


class Room:
    """ room """

    def __init__(self, x, y, w, h, id):
        self.x = x
        self.y = y
        self.width = w
        self.height = h
        self.id = id
        self.print_room()

    def print_room(self):
        print('[room]' + str(self.id) + ': (' + str(self.x) + '), (' + str(self.y) + ')' +
              ' - ' + str(self.width) + 'x' + str(self.height))

    def draw_map(self, tilemap):
        # first wall
        for x in range(0, self.width):
            tilemap[self.x + x][self.y] = Level.TILE_WALL
        # middle
        for y in range(1, self.height - 1):
            tilemap[self.x][self.y + y] = Level.TILE_WALL
            for x in range(1, self.width - 1):
                tilemap[self.x + x][self.y + y] = Level.TILE_GROUND
            tilemap[self.x ++ self.width - 1][self.y + y] = Level.TILE_WALL
        # end
        for x in range(0, self.width):
            tilemap[self.x + x][self.y + self.height - 1] = Level.TILE_WALL

    def center(self):
        return round(self.x + self.width/2), round(self.y + self.height/2)


class Level:
    TILE_WALL = 0
    TILE_ROAD = 1
    TILE_GROUND = 2
    TILE_HALLWAY = 3

    def __init__(self, sizex, sizey, tile_file=None):
        self.sizex, self.sizey = sizex, sizey
        self.tileset = []
        self.tilemap = []
        if tile_file:
            self.load_tileset(tile_file)

        self.tree = None
        self.rooms = []
        self.regenerate()

    def load_tileset(self, tile_file):
        resource_file = open(tile_file)
        line = resource_file.readline().strip()
        while line:
            image_file = re.compile('\d: ').split(line)[1]
            print('loading tile: ' + str(image_file))
            self.tileset.append(pyglet.resource.image(image_file))
            line = resource_file.readline().strip()
        resource_file.close()

    def generate_tree(self):
        # init tree
        tree = [Leaf(0, 0, 30, 30, 0)]

        # split leaves until none succeed
        # Lists are ordered. Tree will be created and travel from left to right
        for l in tree:
            if l.split():
                tree.append(l.left_leaf)
                tree.append(l.right_leaf)

        return tree

    def generate_rooms(self, leaf, tilemap, room_list):
        """
        generate rooms inside partitioned space
        :return: a list of generated rooms
        """
        if leaf.left_leaf:
            self.generate_rooms(leaf.left_leaf, tilemap, room_list)
        if leaf.right_leaf:
            self.generate_rooms(leaf.right_leaf, tilemap, room_list)
        if not leaf.left_leaf and not leaf.right_leaf:
            room = self.generate_room(leaf, tilemap)
            room_list.append(room)

        return room_list

    def generate_room(self, leaf, tilemap):
        # Leave space for walls
        x = random.randint(leaf.x + 1, leaf.x + 2)
        y = random.randint(leaf.y + 1, leaf.y + 2)
        w = random.randint(MIN_LEAF_SIZE / 2, leaf.width - 2)
        h = random.randint(MIN_LEAF_SIZE / 2, leaf.height - 2)

        r = Room(x, y, w, h, leaf.id)
        r.draw_map(tilemap)

        return r

    def regenerate(self):
        """" generate a new level """
        self.tree = self.generate_tree()

        # initialize tilemap with road/ground
        self.tilemap = [[self.TILE_GROUND for y in range(0, self.sizey)] for x in range(0, self.sizex)]

        # create rooms from partitions
        self.rooms = self.generate_rooms(self.tree[0], self.tilemap, [])

        self.generate_hallways()

    def draw_map(self):
        for y in range(0, self.sizey):
            for x in range(0, self.sizex):
                self.tileset[self.tilemap[x][y]].blit(x*TILE_SIZE_X, y*TILE_SIZE_Y)

    def dump_tilemap(self):
        for y in range(0, self.sizey):
            for x in range(0, self.sizex):
                print(self.tilemap[x][y], end="")
            print("")

    def generate_hallways(self):
        """ """
        if len(self.rooms) < 2:
            # out of luck ?
            return

        room_a = self.rooms[0]
        for r in self.rooms[1:]:
            room_b = r
            self.generate_hallway(room_a, room_b)
            room_a = room_b

    def generate_hallway(self, room_a, room_b):
        """ """
        print("hallway between room" + str(room_a.id) + " and room " + str(room_b.id))
        (xa, ya) = room_a.center()
        (xb, yb) = room_b.center()

        # horizontal part
        if xa < xb:
            start_x = xa
            end_x = xb
        else:
            start_x = xb
            end_x = xa
        print("h_hw form " + str(start_x) + " and " + str(end_x))
        for x in range(start_x, end_x):
            self.tilemap[x][ya] = self.TILE_ROAD

        # vertical part
        if ya < yb:
            start_y = ya
            end_y = yb
        else:
            start_y = yb
            end_y = ya
        print("v_hw form " + str(start_y) + " and " + str(end_y))
        for y in range(start_y, end_y):
            self.tilemap[end_x][y] = self.TILE_ROAD


##
# main
##

# main window
window = pyglet.window.Window()


@window.event
def on_key_press(symbol, modifiers):
    # TODO: ugly hack
    global level

    if symbol == key.Q:
        print('Will quit')
        sys.exit(0)
    if symbol == key.R:
        print('Regeneration')
        level.regenerate()
        window.invalid = True
    if symbol == key.D:
        level.dump_tilemap()
    elif symbol == key.LEFT:
        print('Left arrow')
    elif symbol == key.ENTER:
        print('Enter !')


@window.event
def on_draw():
    window.clear()
    level.draw_map()
    label.draw()


# init random
if len(sys.argv) > 1:
    seed = int(sys.argv[1])
else:
    seed = random.randint(0, sys.maxsize)
print("Using seed: " + str(seed))
random.seed(seed)

label_txt = 'Plop World seed: ' + str(seed)
label = pyglet.text.Label(label_txt, x=window.width*5/6, y=window.height*5/6, anchor_x='center', anchor_y='center',
                          multiline=True, width=window.width - window.width*5/6)

level = Level(30, 30, 'tiles.txt')

pyglet.app.run()