squirrel-battle/squirrelbattle/entities/items.py

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# Copyright (C) 2020 by ÿnérant, eichhornchen, nicomarg, charlse
# SPDX-License-Identifier: GPL-3.0-or-later
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from random import choice, randint
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from typing import Optional
from .player import Player
from ..interfaces import Entity, FightingEntity, Map, InventoryHolder
from ..translations import gettext as _
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class Item(Entity):
"""
A class for items.
"""
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held: bool
held_by: Optional[InventoryHolder]
price: int
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def __init__(self, held: bool = False,
held_by: Optional[InventoryHolder] = None,
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price: int = 2, *args, **kwargs):
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super().__init__(*args, **kwargs)
self.held = held
self.held_by = held_by
self.price = price
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def drop(self) -> None:
"""
The item is dropped from the inventory onto the floor.
"""
if self.held:
self.held_by.inventory.remove(self)
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self.held_by.map.add_entity(self)
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self.move(self.held_by.y, self.held_by.x)
self.held = False
self.held_by = None
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def use(self) -> None:
"""
Indicates what should be done when the item is used.
"""
def equip(self) -> None:
"""
Indicates what should be done when the item is equipped.
"""
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def hold(self, player: InventoryHolder) -> None:
"""
The item is taken from the floor and put into the inventory.
"""
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self.held = True
self.held_by = player
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self.held_by.map.remove_entity(self)
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player.add_to_inventory(self)
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def save_state(self) -> dict:
"""
Saves the state of the item into a dictionary.
"""
d = super().save_state()
d["held"] = self.held
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return d
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@staticmethod
def get_all_items() -> list:
"""
Returns the list of all item classes.
"""
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return [BodySnatchPotion, Bomb, Heart, Sword]
def be_sold(self, buyer: InventoryHolder, seller: InventoryHolder) -> bool:
"""
Does all necessary actions when an object is to be sold.
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Is overwritten by some classes that cannot exist in the player's
inventory.
"""
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if buyer.hazel >= self.price:
self.hold(buyer)
seller.remove_from_inventory(self)
buyer.change_hazel_balance(-self.price)
seller.change_hazel_balance(self.price)
return True
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else:
return False
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class Heart(Item):
"""
A heart item to return health to the player.
"""
healing: int
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def __init__(self, name: str = "heart", healing: int = 5, price: int = 3,
*args, **kwargs):
super().__init__(name=name, price=price, *args, **kwargs)
self.healing = healing
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def hold(self, entity: InventoryHolder) -> None:
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"""
When holding a heart, the player is healed and
the item is not put in the inventory.
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"""
entity.health = min(entity.maxhealth, entity.health + self.healing)
entity.map.remove_entity(self)
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def save_state(self) -> dict:
"""
Saves the state of the heart into a dictionary.
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"""
d = super().save_state()
d["healing"] = self.healing
return d
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class Bomb(Item):
"""
A bomb item intended to deal damage to enemies at long range
"""
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damage: int = 5
exploding: bool
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owner: Optional["Player"]
tick: int
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def __init__(self, name: str = "bomb", damage: int = 5,
exploding: bool = False, price: int = 4, *args, **kwargs):
super().__init__(name=name, price=price, *args, **kwargs)
self.damage = damage
self.exploding = exploding
self.tick = 4
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self.owner = None
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def use(self) -> None:
"""
When the bomb is used, it is thrown and then it explodes.
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"""
if self.held:
self.owner = self.held_by
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super().drop()
self.exploding = True
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def act(self, m: Map) -> None:
"""
Special exploding action of the bomb.
"""
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if self.exploding:
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if self.tick > 0:
# The bomb will explode in <tick> moves
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self.tick -= 1
else:
# The bomb is exploding.
# Each entity that is close to the bomb takes damages.
# The player earn XP if the entity was killed.
log_message = _("Bomb is exploding.")
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for e in m.entities.copy():
if abs(e.x - self.x) + abs(e.y - self.y) <= 3 and \
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isinstance(e, FightingEntity):
log_message += " " + e.take_damage(self, self.damage)
if e.dead:
self.owner.add_xp(randint(3, 7))
m.logs.add_message(log_message)
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m.entities.remove(self)
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# Add sparkles where the bomb exploded.
explosion = Explosion(y=self.y, x=self.x)
self.map.add_entity(explosion)
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def save_state(self) -> dict:
"""
Saves the state of the bomb into a dictionary.
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"""
d = super().save_state()
d["exploding"] = self.exploding
d["damage"] = self.damage
return d
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class Explosion(Item):
"""
When a bomb explodes, the explosion is displayed.
"""
def __init__(self, *args, **kwargs):
super().__init__(name="explosion", *args, **kwargs)
def act(self, m: Map) -> None:
"""
The bomb disappears after exploding.
"""
m.remove_entity(self)
def hold(self, player: InventoryHolder) -> None:
"""
The player can't hold an explosion.
"""
pass
class Weapon(Item):
"""
Non-throwable items that improve player damage
"""
damage: int
def __init__(self, damage: int = 3, *args, **kwargs):
super().__init__(*args, **kwargs)
self.damage = damage
def save_state(self) -> dict:
"""
Saves the state of the weapon into a dictionary
"""
d = super().save_state()
d["damage"] = self.damage
return d
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class Sword(Weapon):
"""
A basic weapon
"""
def __init__(self, name: str = "sword", price: int = 20, *args, **kwargs):
super().__init__(name=name, price=price, *args, **kwargs)
self.name = name
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class BodySnatchPotion(Item):
"""
The body-snatch potion allows to exchange all characteristics with a random
other entity.
"""
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def __init__(self, name: str = "body_snatch_potion", price: int = 14,
*args, **kwargs):
super().__init__(name=name, price=price, *args, **kwargs)
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def use(self) -> None:
"""
Find a valid random entity, then exchange characteristics.
"""
valid_entities = self.held_by.map.find_entities(FightingEntity)
valid_entities.remove(self.held_by)
entity = choice(valid_entities)
entity_state = entity.save_state()
player_state = self.held_by.save_state()
self.held_by.__dict__.update(entity_state)
entity.__dict__.update(player_state)
self.held_by.map.currenty, self.held_by.map.currentx = self.held_by.y,\
self.held_by.x
self.held_by.map.logs.add_message(
_("{player} exchanged its body with {entity}.").format(
player=self.held_by.translated_name.capitalize(),
entity=entity.translated_name))
self.held_by.recalculate_paths()
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self.held_by.inventory.remove(self)