141 lines
4.2 KiB
Python
141 lines
4.2 KiB
Python
from __future__ import annotations
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from typing import overload, Optional, Tuple, TYPE_CHECKING
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import color
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import exceptions
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if TYPE_CHECKING:
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from engine import Engine
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from entity import Actor, Entity, Item
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class Action:
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def __init__(self, entity: Actor) -> None:
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super().__init__()
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self.entity = entity
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@property
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def engine(self) -> Engine:
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"""Return the engine this action belongs to."""
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return self.entity.gamemap.engine
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@overload
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def perform(self) -> None:
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"""Perform this action with the objects needed to determine its scope.
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`self.engine` is the scope this action is being performed in.
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`self.entity` is the object performing the action.
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This method must be overwritten by Action subclasses.
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"""
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class ItemAction(Action):
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def __init__(
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self,
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entity: Actor,
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item: Item,
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target_xy: Optional[Tuple[int, int]] = None
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):
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super().__init__(entity)
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self.item = item
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if not target_xy:
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target_xy = entity.x, entity.y
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self.target_xy = target_xy
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@property
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def target_actor(self) -> Optional[Actor]:
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"""Return the actor at this action's destination."""
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return self.engine.game_map.get_actor_at_location(*self.target_xy)
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def perform(self) -> None:
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"""Invoke the item's ability, this action will be given to provide context."""
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self.item.consumable.activate(self)
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class EscapeAction(Action):
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def perform(self) -> None:
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raise SystemExit()
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class WaitAction(Action):
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def perform(self) -> None:
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pass
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class ActionWithDirection(Action):
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def __init__(self, entity: Actor, dx: int, dy: int):
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super().__init__(entity)
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self.dx = dx
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self.dy = dy
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@property
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def dest_xy(self) -> Tuple[int, int]:
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"""Returns this action's destination."""
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return self.entity.x + self.dx, self.entity.y + self.dy
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@property
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def blocking_entity(self) -> Optional[Entity]:
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"""Return the blocking entity at this action's destination."""
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return self.engine.game_map.get_blocking_entity_at_location(*self.dest_xy)
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@property
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def target_actor(self) -> Optional[Actor]:
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"""Return the actor at this action's destination."""
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return self.engine.game_map.get_actor_at_location(*self.dest_xy)
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class MeleeAction(ActionWithDirection):
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def perform(self) -> None:
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target = self.target_actor
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if not target:
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raise exceptions.Impossible("Nothing to attack.")
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damage = self.entity.fighter.power - target.fighter.defense
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attack_desc = f"{self.entity.name.capitalize()} attacks {target.name}"
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if self.entity is self.engine.player:
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attack_color = color.player_atk
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else:
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attack_color = color.enemy_atk
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if damage > 0:
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self.engine.message_log.add_message(
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f"{attack_desc} for {damage} hit points.",
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attack_color,
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)
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target.fighter.hp -= damage
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else:
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self.engine.message_log.add_message(
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f"{attack_desc} but does no damage.",
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attack_color,
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)
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class MovementAction(ActionWithDirection):
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def perform(self) -> None:
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dest_x, dest_y = self.dest_xy
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if not self.engine.game_map.in_bounds(dest_x, dest_y):
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# Destination is out of bounds
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raise exceptions.Impossible("That way is blocked.")
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if not self.engine.game_map.tiles["walkable"][dest_x, dest_y]:
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# Destination is blocked by a tile.
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raise exceptions.Impossible("That way is blocked.")
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if self.engine.game_map.get_blocking_entity_at_location(dest_x, dest_y):
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# Destination is blocked by an entity.
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raise exceptions.Impossible("That way is blocked.")
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self.entity.move(self.dx, self.dy)
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class BumpAction(ActionWithDirection):
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def perform(self) -> None:
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if self.target_actor:
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return MeleeAction(self.entity, self.dx, self.dy).perform()
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else:
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return MovementAction(self.entity, self.dx, self.dy).perform()
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