from random import randint
from typing import Any, Optional

from .entities.player import Player
from .enums import GameMode, KeyValues, DisplayActions
from .interfaces import Map
from .settings import Settings
from . import menus
from typing import Callable


class Game:
    map: Map
    player: Player
    display_actions: Callable[[DisplayActions], None]

    def __init__(self) -> None:
        """
        Init the game.
        """
        self.state = GameMode.MAINMENU
        self.main_menu = menus.MainMenu()
        self.settings_menu = menus.SettingsMenu()
        self.settings = Settings()
        self.settings.load_settings()
        self.settings.write_settings()
        self.settings_menu.update_values(self.settings)

    def new_game(self) -> None:
        """
        Create a new game on the screen.
        """
        # TODO generate a new map procedurally
        self.map = Map.load("resources/example_map_2.txt")
        self.player = Player()
        self.map.add_entity(self.player)
        self.player.move(self.map.start_y, self.map.start_x)
        self.map.spawn_random_entities(randint(3, 10))

    @staticmethod
    def load_game(filename: str) -> None:
        # TODO loading map from a file
        raise NotImplementedError()

    def run(self, screen: Any) -> None:
        """
        Main infinite loop.
        We wait for a player action, then we do what that should be done
        when the given key got pressed.
        """
        while True:  # pragma no cover
            screen.clear()
            screen.refresh()
            self.display_actions(DisplayActions.REFRESH)
            key = screen.getkey()
            self.handle_key_pressed(
                KeyValues.translate_key(key, self.settings), key)

    def handle_key_pressed(self, key: Optional[KeyValues], raw_key: str = '')\
            -> None:
        """
        Indicates what should be done when the given key is pressed,
        according to the current game state.
        """
        if self.state == GameMode.PLAY:
            self.handle_key_pressed_play(key)
        elif self.state == GameMode.MAINMENU:
            self.main_menu.handle_key_pressed(key, self)
        elif self.state == GameMode.SETTINGS:
            self.settings_menu.handle_key_pressed(key, raw_key, self)
        self.display_actions(DisplayActions.REFRESH)

    def handle_key_pressed_play(self, key: KeyValues) -> None:
        """
        In play mode, arrows or zqsd should move the main character.
        """
        if key == KeyValues.UP:
            if self.player.move_up():
                self.map.tick()
        elif key == KeyValues.DOWN:
            if self.player.move_down():
                self.map.tick()
        elif key == KeyValues.LEFT:
            if self.player.move_left():
                self.map.tick()
        elif key == KeyValues.RIGHT:
            if self.player.move_right():
                self.map.tick()
        elif key == KeyValues.SPACE:
            self.state = GameMode.MAINMENU