from typing import Set, Iterable, Any

from tcod.context import Context
from tcod.console import Console

from actions import EscapeAction, MovementAction
from input_events import EventHandler

from entity import Entity

class Engine:
	def __init__(self, entities: Set[Entity], event_handler: EventHandler, player: Entity):
		self.entities = entities
		self.event_handler = event_handler
		self.player = player
	
	def handle_events(self, events: Iterable[Any]) -> None:
		for event in events:
			action = self.event_handler.dispatch(event)

			if action is None:
				continue
			
			elif isinstance(action, EscapeAction):
				raise SystemExit()
			
			elif isinstance(action, MovementAction):
				self.player.move(action.dx, action.dy)
	
	def render(self, console: Console, context: Context) -> None:
		for entity in self.entities:
			console.print(entity.x, entity.y, entity.char, fg=entity.color)
		
		context.present(console)
		console.clear()