# -*- coding: UTF-8 -*-

### Tangled Mind
### Author: Arthur 'Grizzly' Grisel-Davy

from glob import glob
import random
import pygame
import yaml

def fetch_rooms(path):
    """Fetch all the basic tiles asset from the path.
    Return a dictionary
    """

    common_wildcard = '[A-Z]*-*.png'
    unique_wildcard = '?-*.png'
    common_filenames = glob(path+common_wildcard)
    unique_filenames = glob(path+unique_wildcard)
    #print(f"Found {len(common_filenames)} common rooms and {len(unique_filenames)} uniques rooms.")

    assembly = {'T':[],
                'R':[],
                'D':[],
                'L':[],}

    for filename in common_filenames:
        label = filename.split("/")[-1].split('-')[0]
        if 'T' in label:
            assembly['D'].append((label,filename))
        if 'R' in label:
            assembly['L'].append((label,filename))
        if 'D' in label:
            assembly['T'].append((label,filename))
        if 'L' in label:
            assembly['R'].append((label,filename))

    background = glob(path+'*back*')[0]

    return unique_filenames,assembly,background

def check_map(carte):
    """Function to check if a map is valid i.e. if no two rooms are at the same location
    """
    positions = []
    for room in carte:
        if room[2] in positions:
            return(False)
        else:
            positions.append(room[2])
    return(True)

def map_generator(n):
    """Map generator generate a map with a main path of n rooms
    """

    with open(r'./config.yaml') as file:
        data = yaml.load(file,Loader=yaml.FullLoader)
        room_side = data['room_side']

    change_side = {'T':'D','R':'L','D':'T','L':'R'}
    deplacements = {'T':[0,-1],'R':[1,0],'D':[0,1],'L':[-1,0]}

    unique_filenames,assembly,back_path = fetch_rooms('./maps/rooms/')
    #assembly = {'T/R/D/L':[(label1,path1),(label2,path2),...]}


    unique_rooms = {filename.split("/")[-1][0].upper():pygame.image.load(filename).convert_alpha() for filename in unique_filenames}

    current_label= random.choice(list(unique_rooms.keys()))
    start_room = unique_rooms[current_label]

    # Place the first room in the list
    positions = []
    position = [0,0]
    mask = pygame.mask.from_surface(start_room)
    carte = [(start_room,mask,position)]

    open_paths = []


    counter = 0
    retry = 0
    while counter <= n:

        # select the next direction, can't be the direction of arrival
        if len(current_label) > 1:
            dir_next = random.choice(current_label.replace(dir_from,''))
        else:
            dir_next = current_label
            dir_from = ''

        # stor open paths for later closing
        for other_direction in current_label.replace(dir_from,'').replace(dir_next,''):
            other_dir_from = change_side[other_direction]
            other_position = [a+room_side*b for a,b in zip(position,deplacements[other_direction])]
            open_paths.append((other_dir_from,other_position))

        # Select the next room
        if counter < n: # The next room is not the final room.
            next_label,next_room = random.choice(assembly[dir_next])
            asset = pygame.image.load(next_room).convert_alpha()

        else:
            # The next room is the finale room.
            asset = unique_rooms[change_side[dir_next]]

        mask = pygame.mask.from_surface(asset)
        next_position = [position[0]+room_side*deplacements[dir_next][0],position[1]+room_side*deplacements[dir_next][1]]
        dir_from = change_side[dir_next]

        # Check if we are not overwriting an existing room and store the current one.
        if next_position not in positions:
            counter += 1
            # Build the map
            carte.append((asset,mask,next_position))
            positions.append(position)

            # Update the variables for next turn
            current_label = next_label
            position = next_position
            positions.append(position)
        else:
            retry +=1
            if retry > 10:
                raise ValueError("Too much retries")


    if not check_map(carte):
        raise ValueError("Invalid Map before closing paths.")

    #Close all the open paths
    for open_path in open_paths:
        if open_path[1] not in positions:
            room = unique_rooms[open_path[0]]
            mask = pygame.mask.from_surface(room)
            position = open_path[1]
            carte.append((room,mask,position))
            positions.append(position)

    background = pygame.image.load(back_path).convert()

    if not check_map(carte):
        raise ValueError("Invalid Map after closing paths.")

    return(carte,(int(room_side/2),int(room_side/2)),background)