import pyglet
from pyglet.window import key

import sys
import re

import random

# constants
TILE_SIZE_X = 16
TILE_SIZE_Y = 16

MIN_LEAF_SIZE = 4

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(str(self.id) + ': (' + str(self.x) + '), (' + str(self.y) + ')' +
              ' - ' + str(self.width) + 'x' + str(self.height)              )

    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-1, self.y, self.width - split_point+1, 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-1, self.width, self.height - split_point+1, self.id+2)

        return True

    def draw(self, wall, ground):
        # first wall
        for x in range(0, self.width):
            wall.blit((self.x+x)*TILE_SIZE_X, self.y*TILE_SIZE_Y)
        # middle
        for y in range(1, self.height-1):
            wall.blit(self.x*TILE_SIZE_X, (self.y+y)*TILE_SIZE_Y)
            for x in range(1, self.width - 1):
                ground.blit((self.x + x)*TILE_SIZE_X, (self.y+y)*TILE_SIZE_Y)
            wall.blit((self.x+self.width-1)*TILE_SIZE_X, (self.y+y)*TILE_SIZE_Y)
        # end
        for x in range(0, self.width):
            wall.blit((self.x+x)*TILE_SIZE_X, (self.y + self.height-1)*TILE_SIZE_Y)

def generate_tree():
    # init tree
    tree = [Leaf(0, 0, 24, 24, 0)]
    #tree = [Leaf(0, 0, 10, 10, 0)]
    #tree = [Leaf(0, 0, 5, 5, 0)]

    # split leaves until none succeed
    split_done = True
    while split_done:
        split_done = False
        for l in tree:
            if l.left_leaf == None and l.right_leaf == None:
                if (l.split()):
                    tree.append(l.left_leaf)
                    tree.append(l.right_leaf)
                    split_done = True

    return tree


##
# main
##

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

@window.event
def on_key_press(symbol, modifiers):
    #TODO: ugly hack
    global level_tree
    
    if symbol == key.Q:
        print('Will quit')
    if symbol == key.R:
        print('Regeneration')
        level_tree = generate_tree()
        window.invalid = True
    elif symbol == key.LEFT:
        print('Left arrow')
    elif symbol == key.ENTER:
        print('Enter !')

@window.event
def on_draw():
    window.clear()
    draw_tree(level_tree)

    label.draw()

def draw_tree(t):
    """
    :param t: each leave of t will be draw()
    """
    for l in t:
        # draw only last leaves
        if l.left_leaf == None and l.right_leaf == None:
            l.draw(tiles[TILE_WALL], tiles[TILE_GROUND])


# init random
#TODO add seed mode (how ?)
random.seed()

label = pyglet.text.Label('Plop World', x = window.width*3/4, y = window.height*3/4, anchor_x='center', anchor_y='center')

# load images
tiles = []
resource_file = open('tiles.txt')
line = resource_file.readline().strip()
while line:
    tile_file = re.compile('\d: ').split(line)[1]
    print('loading tile: ' + str(tile_file))
    tiles.append(pyglet.resource.image(tile_file))
    line = resource_file.readline().strip()

TILE_WALL = 0
TILE_GROUND = 2

level_tree = generate_tree()

# artificial tree to test drawing
# troot = Leaf(0, 0, 24, 24, 0)
# tll = Leaf(0, 0, 16, 24, 1)
# trl = Leaf(16, 0, 8, 24, 2)
# troot.left_leaf = tll
# troot.right_leaf = trl
# tllvl = Leaf(0, 0, 16, 4, 3)
# tllvr = Leaf(0, 4, 16, 20, 4)
# level_tree = [troot, tll, trl, tllvl, tllvr]

pyglet.app.run()