import sys
from typing import Any

from .display.display import Display
from .display.mapdisplay import MapDisplay
from .display.menudisplay import MenuDisplay
from .display.texturepack import TexturePack
from .entities.player import Player
from .interfaces import Map
from .settings import Settings
from enum import Enum, auto
from . import menus


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
    menu_display: MenuDisplay
    map_display: MapDisplay
    display: Display

    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, screen: Any) -> None:
        """
        Create a new game on the screen.
        """
        # TODO generate a new map procedurally
        self.map = Map.load("example_map.txt")
        self.player = Player()
        self.player.move(1, 6)
        self.map.add_entity(self.player)
        self.display = Display(screen, TexturePack.get_pack(self.settings.TEXTURE_PACK))
#        self.menu_display = MenuDisplay(screen, self.main_menu, 0, 0)

    @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:
            self.player.move_up()
        elif key == KeyValues.DOWN:
            self.player.move_down()
        elif key == KeyValues.LEFT:
            self.player.move_left()
        elif key == KeyValues.RIGHT:
            self.player.move_right()
        elif key == KeyValues.SPACE:
            self.state = GameMode.MAINMENU
            self.display = self.menu_display

    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
                self.display = self.map_display
            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
            self.display = self.menu_display