//! 剧情领域错误。
//!
//! 错误保持纯 story session 规则语义，例如会话字段缺失、事件内容为空或版本非法。

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

#[derive(Clone, Debug, PartialEq, Eq)]
pub enum StorySessionFieldError {
    MissingSessionId,
    MissingRuntimeSessionId,
    MissingActorUserId,
    MissingWorldProfileId,
    MissingInitialPrompt,
    MissingNarrativeText,
    MissingEventId,
    InvalidVersion,
}

impl fmt::Display for StorySessionFieldError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            Self::MissingSessionId => f.write_str("story_session.story_session_id 不能为空"),
            Self::MissingRuntimeSessionId => {
                f.write_str("story_session.runtime_session_id 不能为空")
            }
            Self::MissingActorUserId => f.write_str("story_session.actor_user_id 不能为空"),
            Self::MissingWorldProfileId => f.write_str("story_session.world_profile_id 不能为空"),
            Self::MissingInitialPrompt => f.write_str("story_session.initial_prompt 不能为空"),
            Self::MissingNarrativeText => f.write_str("story_event.narrative_text 不能为空"),
            Self::MissingEventId => f.write_str("story_event.event_id 不能为空"),
            Self::InvalidVersion => f.write_str("story_session.version 必须大于 0"),
        }
    }
}

impl Error for StorySessionFieldError {}