# Copyright (C) 2020 by ÿnérant, eichhornchen, nicomarg, charlse
# SPDX-License-Identifier: GPL-3.0-or-later

from typing import Optional

from .player import Player
from ..interfaces import Entity, FightingEntity, Map


class Item(Entity):
    """
    A class for items
    """
    held: bool
    held_by: Optional[Player]

    def __init__(self, held: bool = False, held_by: Optional[Player] = None,
                 *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.held = held
        self.held_by = held_by

    def drop(self) -> None:
        """
        The item is dropped from the inventory onto the floor
        """
        if self.held:
            self.held_by.inventory.remove(self)
            self.map.add_entity(self)
            self.move(self.held_by.y, self.held_by.x)
            self.held = False
            self.held_by = None

    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.
        """

    def hold(self, player: "Player") -> None:
        """
        The item is taken from the floor and put into the inventory
        """
        self.held = True
        self.held_by = player
        self.map.remove_entity(self)
        player.inventory.append(self)

    def save_state(self) -> dict:
        """
        Saves the state of the entity into a dictionary
        """
        d = super().save_state()
        d["held"] = self.held
        return d


class Heart(Item):
    """
    A heart item to return health to the player
    """
    healing: int

    def __init__(self, healing: int = 5, *args, **kwargs):
        super().__init__(name="heart", *args, **kwargs)
        self.healing = healing

    def hold(self, player: "Player") -> None:
        """
        When holding a heart, heal the player and don't put item in inventory.
        """
        player.health = min(player.maxhealth, player.health + self.healing)
        self.map.remove_entity(self)

    def save_state(self) -> dict:
        """
        Saves the state of the header into a dictionary
        """
        d = super().save_state()
        d["healing"] = self.healing
        return d


class Bomb(Item):
    """
    A bomb item intended to deal damage to enemies at long range
    """
    damage: int = 5
    tick: int
    exploding: bool

    def __init__(self, damage: int = 5, exploding: bool = False,
                 *args, **kwargs):
        super().__init__(name="bomb", *args, **kwargs)
        self.damage = damage
        self.exploding = exploding
        self.tick = 5

    def use(self) -> None:
        """
        When the bomb is used, throw it and explodes it.
        """
        if self.held:
            super().drop()
            self.exploding = True

    def act(self, m: Map) -> None:
        """
        Special exploding action of the bomb
        """
        if self.exploding:
            if self.tick > 0:
                self.tick -= 1
            else:
                for e in m.entities.copy():
                    if abs(e.x - self.x) + abs(e.y - self.y) <= 1 and \
                            isinstance(e, FightingEntity):
                        e.take_damage(self, self.damage)
                m.entities.remove(self)

    def save_state(self) -> dict:
        """
        Saves the state of the bomb into a dictionary
        """
        d = super().save_state()
        d["exploding"] = self.exploding
        d["damage"] = self.damage
        return d