use serde::{Deserialize, Serialize};

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq, Hash, Default)]
pub struct NodeId(pub String);

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum NodeKind {
    Start,
    End,
    Task,
    Decision,
}

impl Default for NodeKind {
    fn default() -> Self { Self::Task }
}

#[derive(Debug, Clone, Serialize, Deserialize, Default)]
pub struct NodeDef {
    pub id: NodeId,
    #[serde(default)]
    pub kind: NodeKind,
    #[serde(default)]
    pub name: String,
    #[serde(default)]
    pub task: Option<String>, // 绑定的任务组件标识
}

#[derive(Debug, Clone, Serialize, Deserialize, Default)]
pub struct LinkDef {
    pub from: NodeId,
    pub to: NodeId,
    #[serde(default)]
    pub condition: Option<String>, // 条件脚本，返回 bool
}

#[derive(Debug, Clone, Serialize, Deserialize, Default)]
pub struct ChainDef {
    #[serde(default)]
    pub name: String,
    pub nodes: Vec<NodeDef>,
    #[serde(default)]
    pub links: Vec<LinkDef>,
}