//! runtime story 领域错误。
//!
//! 错误只表达运行时剧情规则失败，不能直接绑定 HTTP 或数据库错误模型。

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

#[derive(Clone, Debug, PartialEq, Eq)]
pub enum RuntimeStoryRuleError {
    MissingRuntimeSessionId,
    MissingStoryAction,
    UnsupportedStoryAction,
    InvalidRuntimeSnapshot,
}

impl fmt::Display for RuntimeStoryRuleError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            Self::MissingRuntimeSessionId => f.write_str("runtime_story.session_id 不能为空"),
            Self::MissingStoryAction => f.write_str("runtime_story.action 不能为空"),
            Self::UnsupportedStoryAction => f.write_str("runtime_story.action 当前不受支持"),
            Self::InvalidRuntimeSnapshot => f.write_str("runtime_story.snapshot 非法"),
        }
    }
}

impl Error for RuntimeStoryRuleError {}