from abc import ABC, abstractmethod
import random

# ════════════════════════════════════════
# ABSTRACT — Ch.8
# ════════════════════════════════════════
class KyNangABC(ABC):
    def __init__(self, ten, mana_cost):
        self.ten       = ten
        self.mana_cost = mana_cost

    @abstractmethod
    def su_dung(self, nguoi_dung, muc_tieu): pass

    def __str__(self):
        return f"✦ {self.ten} ({self.mana_cost} mana)"

# ════════════════════════════════════════
# BASE CLASS — Ch.1,2,3
# ════════════════════════════════════════
class NhanVat:
    _so_nhan_vat = 0         ← class attribute — Ch.7

    def __init__(self, ten, hp, mana, suc_manh):
        self.ten       = ten
        self.__hp      = hp        ← private — Ch.3
        self.hp_max    = hp
        self.mana      = mana
        self.suc_manh  = suc_manh
        self.ky_nang   = []       ← composition — Ch.9
        self.kinh_nghiem = 0
        NhanVat._so_nhan_vat += 1

      # ── @property — Ch.3 ────────────────
    @property
    def hp(self): return self.__hp

    @hp.setter
    def hp(self, val):
        self.__hp = max(0, min(val, self.hp_max))

    @property
    def con_song(self): return self.__hp > 0

      # ── Magic Methods — Ch.6 ────────────
    def __str__(self):
        thanh_hp = "█" * int(self.hp/self.hp_max * 10) + "░" * (10 - int(self.hp/self.hp_max * 10))
        return f"[{self.ten:10}] HP:{self.hp:3}/{self.hp_max} [{thanh_hp}] Mana:{self.mana:3}"

    def __lt__(self, other): return self.hp < other.hp

      # ── Methods — Ch.2 ──────────────────
    def them_ky_nang(self, kn):
        self.ky_nang.append(kn); return self

    def tan_cong(self, muc_tieu):     ← override ở class con — Ch.5
        sat = NhanVat.tinh_sat_thuong(self.suc_manh)
        muc_tieu.hp -= sat
        self.kinh_nghiem += 10
        print(f"  ⚔️  {self.ten} đánh {muc_tieu.ten}: -{sat} HP")

    def dung_ky_nang(self, idx, muc_tieu):
        if idx < len(self.ky_nang):
            self.ky_nang[idx].su_dung(self, muc_tieu)

      # ── @staticmethod — Ch.7 ────────────
    @staticmethod
    def tinh_sat_thuong(co_ban):
        return co_ban + random.randint(-3, 5)

      # ── @classmethod — Ch.7 ─────────────
    @classmethod
    def tong_so(cls):
        return cls._so_nhan_vat