//! 战斗领域错误。
//!
//! 错误保持纯领域语义，不能绑定 HTTP 状态码或 SpacetimeDB 字符串格式。

use std::{error::Error, fmt};

#[derive(Clone, Debug, PartialEq, Eq)]
pub enum CombatFieldError {
    MissingBattleStateId,
    MissingStorySessionId,
    MissingRuntimeSessionId,
    MissingActorUserId,
    MissingTargetNpcId,
    MissingTargetName,
    MissingFunctionId,
    InvalidVersion,
    InvalidPlayerVitals,
    InvalidTargetVitals,
    InvalidRewardItem(String),
    BattleAlreadyResolved,
    UnsupportedFunctionId,
    InsufficientMana,
}

impl fmt::Display for CombatFieldError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            Self::MissingBattleStateId => f.write_str("battle_state.battle_state_id 不能为空"),
            Self::MissingStorySessionId => f.write_str("battle_state.story_session_id 不能为空"),
            Self::MissingRuntimeSessionId => {
                f.write_str("battle_state.runtime_session_id 不能为空")
            }
            Self::MissingActorUserId => f.write_str("battle_state.actor_user_id 不能为空"),
            Self::MissingTargetNpcId => f.write_str("battle_state.target_npc_id 不能为空"),
            Self::MissingTargetName => f.write_str("battle_state.target_name 不能为空"),
            Self::MissingFunctionId => f.write_str("resolve_combat_action.function_id 不能为空"),
            Self::InvalidVersion => f.write_str("battle_state.version 必须大于 0"),
            Self::InvalidPlayerVitals => f.write_str("battle_state 玩家生命或灵力字段不合法"),
            Self::InvalidTargetVitals => f.write_str("battle_state 目标生命字段不合法"),
            Self::InvalidRewardItem(message) => f.write_str(message),
            Self::BattleAlreadyResolved => f.write_str("battle_state 已经结束，不能继续结算"),
            Self::UnsupportedFunctionId => {
                f.write_str("resolve_combat_action.function_id 当前不受支持")
            }
            Self::InsufficientMana => f.write_str("当前灵力不足，无法执行该战斗动作"),
        }
    }
}

impl Error for CombatFieldError {}