import os
import yaml
from typing import Any, List, Optional

with open('config.yaml', 'r') as open_file:
    SETTINGS = yaml.load(open_file)

def at(keys : List[str]) -> Optional[Any]:
    """
        Potentially get a value. If it doesn't exist, return None.
    """
    return at_value(keys, SETTINGS)

def at_value(keys : List[str], value : Any) -> Optional[Any]:
    try:
        head, tail = keys[0], keys[1:]
    except IndexError:
        return value
    else:
        try:
            new_value = value[head]
        except TypeError:
            return None
        except KeyError:
            return None
        else:
            return at_value(tail, new_value)

# EULA
EULA = at(['minecraft', 'eula']) or False

# Minecraft bridge credentials
MATRIX_HOMESERVER = at(['matrix', 'homeserver']) or "https://matrix.example.org/"
MATRIX_USERNAME   = at(['matrix', 'username'])   or "@alice:example.org"
MATRIX_PASSWORD   = at(['matrix', 'password'])   or "bridge_password"

# Matrix bridge room
MATRIX_ROOM = at(['matrix', 'room_id']) or "!channel_id:example.org"

SERVER_IP = os.getenv('SERVER_ADDRESS') or 'unknown ip'

# Matrix users who are allowed to run OP commands in Minecraft through Matrix
MC_ADMINS = [
    "@bramvdnheuvel:nltrix.net",                # Bram on Matrix  (example, feel free to remove)
    "@_discord_625632515314548736:t2bot.io"     # Bram on Discord (example, feel free to remove)
    # Your username on Matrix
]
if os.getenv('MATRIX_ADMINS') is not None:
    MC_ADMINS = os.getenv('MATRIX_ADMINS').split(',')

make_bool = lambda os_value, default_value : default_value if not os_value else (
    False if os_value.lower() == 'false' else True
)

SERVER_SETTINGS = {
    'level-name': os.getenv('WORLD') or 'world',
    
    # Server settings
    'port'          : 25565 if os.getenv('PORT') == None else int(os.getenv('PORT')),
    'query.port'    : 25565 if os.getenv('PORT') == None else int(os.getenv('PORT')),
    'max-players'   : 7 if os.getenv('MAX_PLAYERS') == None else int(os.getenv('MAX_PLAYERS')),
    
    # Server temperature  >:3
    'view-distance'         : 10 if os.getenv('RENDER_DISTANCE') == None else int(os.getenv('RENDER_DISTANCE')),
    'enable-command-block'  : make_bool(os.getenv('COMMAND_BLOCKS'), True),
    
    # Environment
    'allow-nether'      : make_bool(os.getenv('NETHER'),    True),
    'spawn-npcs'        : make_bool(os.getenv('NPCS'),      True),
    'spawn-animals'     : make_bool(os.getenv('ANIMALS'),   True),
    'spawn-monsters'    : make_bool(os.getenv('MONSTERS'),  True),
    
    # Gamemode
    'pvp'       : make_bool(os.getenv('PVP'),       True),
    'gamemode'  : os.getenv('GAMEMODE') or 'survival',
    'difficulty': os.getenv('DIFFICULTY') or 'medium',
    'hardcore'  : make_bool(os.getenv('HARDCORE'),  False),
    
    # Grief protection
    'online-mode'       : make_bool(os.getenv('VERIFY_ACCOUNTS'),   True),
    'white-list'        : make_bool(os.getenv('WHITELIST'),         True),
    'enforce-whitelist' : make_bool(os.getenv('WHITELIST'),         True),
    'spawn-protection'  : 16 if os.getenv('SPAWN_PROTECTION') == None else os.getenv('SPAWN_PROTECTION'),
}