import sys
from random import randint
from typing import Any

from .entities.player import Player
from .interfaces import Map
from .settings import Settings
from enum import Enum, auto
from . import menus
from typing import Callable


class GameMode(Enum):
    MAINMENU = auto()
    PLAY = auto()
    SETTINGS = auto()
    INVENTORY = auto()


class KeyValues(Enum):
    UP = auto()
    DOWN = auto()
    LEFT = auto()
    RIGHT = auto()
    ENTER = auto()
    SPACE = auto()


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

    def __init__(self) -> None:
        """
        Init the game.
        """
        self.state = GameMode.MAINMENU
        self.main_menu = menus.MainMenu()
        self.settings = Settings()
        self.settings.load_settings()
        self.settings.write_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.txt")
        self.map.currenty = 1
        self.map.currentx = 6
        self.player = Player()
        self.map.add_entity(self.player)
        self.player.move(1, 6)
        self.map.spawn_random_entities(randint(1, 5))

    @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:
            screen.clear()
            screen.refresh()
            self.display_refresh()
            key = screen.getkey()
            self.handle_key_pressed(self.translate_key(key))

    def translate_key(self, key: str) -> KeyValues:
        """
        Translate the raw string key into an enum value that we can use.
        """
        if key in (self.settings.KEY_DOWN_SECONDARY,
                   self.settings.KEY_DOWN_PRIMARY):
            return KeyValues.DOWN
        elif key in (self.settings.KEY_LEFT_PRIMARY,
                     self.settings.KEY_LEFT_SECONDARY):
            return KeyValues.LEFT
        elif key in (self.settings.KEY_RIGHT_PRIMARY,
                     self.settings.KEY_RIGHT_SECONDARY):
            return KeyValues.RIGHT
        elif key in (self.settings.KEY_UP_PRIMARY,
                     self.settings.KEY_UP_SECONDARY):
            return KeyValues.UP
        elif key == self.settings.KEY_ENTER:
            return KeyValues.ENTER
        elif key == ' ':
            return KeyValues.SPACE

    def handle_key_pressed(self, key: KeyValues) -> 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.handle_key_pressed_main_menu(key)
        elif self.state == GameMode.SETTINGS:
            self.handle_key_pressed_settings(key)
        self.display_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

    def handle_key_pressed_main_menu(self, key: KeyValues) -> None:
        """
        In the main menu, we can navigate through options.
        """
        if key == KeyValues.DOWN:
            self.main_menu.go_down()
        if key == KeyValues.UP:
            self.main_menu.go_up()
        if key == KeyValues.ENTER:
            option = self.main_menu.validate()
            if option == menus.MainMenuValues.START:
                self.state = GameMode.PLAY
            elif option == menus.MainMenuValues.SETTINGS:
                self.state = GameMode.SETTINGS
            elif option == menus.MainMenuValues.EXIT:
                sys.exit(0)

    def handle_key_pressed_settings(self, key: KeyValues) -> None:
        """
        For now, in the settings mode, we can only go backwards.
        """
        if key == KeyValues.SPACE:
            self.state = GameMode.MAINMENU