agent-base 0.1.3

use serde::{Deserialize, Serialize};

#[derive(Clone, Debug, Eq, Hash, PartialEq, Serialize, Deserialize)]
pub struct SessionId {
    pub id: u64,
    pub external_id: Option<String>,
}

impl SessionId {
    pub fn new(id: u64) -> Self {
        Self { id, external_id: None }
    }

    pub fn with_external_id(id: u64, external_id: impl Into<String>) -> Self {
        Self { id, external_id: Some(external_id.into()) }
    }
}

impl std::fmt::Display for SessionId {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        if let Some(ref ext) = self.external_id {
            write!(f, "{}({})", self.id, ext)
        } else {
            write!(f, "{}", self.id)
        }
    }
}

pub trait SessionIdGenerator: Send + Sync {
    fn generate(&self) -> SessionId;
}

pub struct AtomicU64SessionIdGenerator {
    counter: std::sync::atomic::AtomicU64,
}

impl AtomicU64SessionIdGenerator {
    pub fn new(start: u64) -> Self {
        Self {
            counter: std::sync::atomic::AtomicU64::new(start),
        }
    }
}

impl Default for AtomicU64SessionIdGenerator {
    fn default() -> Self {
        Self::new(1)
    }
}

impl SessionIdGenerator for AtomicU64SessionIdGenerator {
    fn generate(&self) -> SessionId {
        SessionId::new(self.counter.fetch_add(1, std::sync::atomic::Ordering::Relaxed))
    }
}

pub struct UuidSessionIdGenerator;

impl SessionIdGenerator for UuidSessionIdGenerator {
    fn generate(&self) -> SessionId {
        SessionId::with_external_id(0, uuid::Uuid::new_v4().to_string())
    }
}