from typing import Any, Iterable

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

from entity import Entity
from floor_map import FloorMap #TODO: replace with "DungeonMap"

class Engine:
	def __init__(self, floor_map: FloorMap):
		from event_handler import EventHandler #here to prevent circular imports
		self.event_handler = EventHandler(self)

		self.player = Entity(0, 0, "@", (255, 255, 255))
		self.floor_map = floor_map
		self.entities: Iterable[Entity] = []

		#spawn the player, add to render list
		self.player.x, self.player.y = self.floor_map.spawn
		self.entities.append(self.player)

		#kick off the render
		self.update_fov()

	def handle_events(self, events: Iterable[Any]) -> None:
		for event in events:
			action = self.event_handler.dispatch(event)

			if action is None:
				continue

			action.apply(self)

			self.update_fov() #update before the next action

	def update_fov(self):
		self.floor_map.visible[:] = compute_fov(
			self.floor_map.tiles["transparent"],
			(self.player.x, self.player.y),
			radius = 8,
		)

		#add the visible tiles to the explored list
		self.floor_map.explored |= self.floor_map.visible

	def render(self, context: Context, console: Console) -> None:
		self.floor_map.render(console)

		for entity in self.entities:
			if self.floor_map.visible[entity.x, entity.y]:
				console.print(entity.x, entity.y, entity.char, fg=entity.color)

		#send to the screen
		context.present(console)
		console.clear()