from __future__ import annotations

from dataclasses import dataclass, field
from decimal import Decimal
from typing import Dict, List, Tuple


@dataclass(frozen=True)
class Bomb:
    bomb_id: str
    value: int
    position: int | None = None


@dataclass(frozen=True)
class Elimination:
    symbol: str
    count: int
    positions: Tuple[int, ...]
    payout_multiplier: Decimal


@dataclass(frozen=True)
class CascadeResult:
    cascade_index: int
    eliminations: Tuple[Elimination, ...]
    bombs: Tuple[Bomb, ...]
    base_win: Decimal
    accumulated_symbols: Dict[str, int]


@dataclass(frozen=True)
class SpinResult:
    spin_index: int
    cascades: Tuple[CascadeResult, ...]
    base_win: Decimal
    multiplier_before: int
    bombs_added: int
    multiplier_after: int
    effective_multiplier: int
    total_win: Decimal
    accumulated_symbols: Dict[str, int]
    win_capped: bool = False  # 本回合赢奖因 1000x 封顶被截断


@dataclass
class SessionState:
    next_spin_index: int = 1
    accumulated_multiplier: int = 0
    total_win: Decimal = Decimal("0")
    spins: List[SpinResult] = field(default_factory=list)

    def reset(self) -> None:
        self.next_spin_index = 1
        self.accumulated_multiplier = 0
        self.total_win = Decimal("0")
        self.spins.clear()