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use std::{collections::HashMap, convert::Infallible, sync::Arc};

use async_trait::async_trait;
use parking_lot::Mutex;
use time::OffsetDateTime;

use crate::{
    session::{Id, Session},
    SessionStore,
};

/// A session store that lives only in memory.
///
/// This is useful for testing but not recommended for real applications.
///
/// # Examples
///
/// ```rust
/// use tower_sessions::MemoryStore;
/// MemoryStore::default();
/// ```
#[derive(Clone, Debug, Default)]
pub struct MemoryStore(Arc<Mutex<HashMap<Id, Session>>>);

#[async_trait]
impl SessionStore for MemoryStore {
    type Error = Infallible;

    async fn save(&self, session: &Session) -> Result<(), Self::Error> {
        self.0.lock().insert(*session.id(), session.clone());
        Ok(())
    }

    async fn load(&self, session_id: &Id) -> Result<Option<Session>, Self::Error> {
        Ok(self.0.lock().get(session_id).filter(is_active).cloned())
    }

    async fn delete(&self, session_id: &Id) -> Result<(), Self::Error> {
        self.0.lock().remove(session_id);
        Ok(())
    }
}

fn is_active(session: &&Session) -> bool {
    let expiry_date = session.expiry_date();
    expiry_date > OffsetDateTime::now_utc()
}