//! NPC 领域错误。
//!
//! 错误只表达互动规则失败，例如状态不允许、好感不足或目标非法。

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

#[derive(Clone, Debug, PartialEq, Eq)]
pub enum NpcStateFieldError {
    MissingRuntimeSessionId,
    MissingNpcId,
    MissingNpcName,
    MissingInteractionFunctionId,
    HelpAlreadyUsed,
    RecruitAffinityTooLow,
    UnsupportedInteractionFunctionId,
}

impl fmt::Display for NpcStateFieldError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            Self::MissingRuntimeSessionId => f.write_str("npc_state.runtime_session_id 不能为空"),
            Self::MissingNpcId => f.write_str("npc_state.npc_id 不能为空"),
            Self::MissingNpcName => f.write_str("npc_state.npc_name 不能为空"),
            Self::MissingInteractionFunctionId => {
                f.write_str("resolve_npc_interaction.interaction_function_id 不能为空")
            }
            Self::HelpAlreadyUsed => f.write_str("npc_state.help_used 已经消耗，不能重复援手"),
            Self::RecruitAffinityTooLow => {
                f.write_str("npc_state.affinity 未达到招募阈值，不能执行招募动作")
            }
            Self::UnsupportedInteractionFunctionId => {
                f.write_str("resolve_npc_interaction.interaction_function_id 当前不受支持")
            }
        }
    }
}

impl Error for NpcStateFieldError {}