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//! An async-session implementation for MongoDB

#![forbid(unsafe_code, future_incompatible, rust_2018_idioms)]
#![deny(missing_debug_implementations, nonstandard_style)]
#![warn(missing_docs, missing_doc_code_examples, unreachable_pub)]

use async_session::{Result, Session, SessionStore};
use async_trait::async_trait;
use mongodb::bson::doc;
use mongodb::options::ReplaceOptions;
use mongodb::Client;

/// A MongoDB session store.
#[derive(Debug, Clone)]
pub struct MongodbSessionStore {
    client: mongodb::Client,
    db: String,
    coll_name: String,
}

impl MongodbSessionStore {
    /// Create a new instance of `MongodbSessionStore`.
    pub async fn connect(uri: &str, db: &str, coll_name: &str) -> mongodb::error::Result<Self> {
        let client = Client::with_uri_str(uri).await?;
        Ok(Self::from_client(client, db, coll_name))
    }

    /// Create a new instance of `MongodbSessionStore` from an open client.
    pub fn from_client(client: Client, db: &str, coll_name: &str) -> Self {
        Self {
            client,
            db: db.to_string(),
            coll_name: coll_name.to_string(),
        }
    }
}

#[async_trait]
impl SessionStore for MongodbSessionStore {
    async fn store_session(&self, session: Session) -> Result<Option<String>> {
        let coll = self.client.database(&self.db).collection(&self.coll_name);

        // TODO: mongodb supports TTL for auto-expiry somehow, need to figure out how!
        let value = serde_json::to_string(&session)?;
        let id = session.id();
        let query = doc! { "session_id": id };
        let replacement = doc! { "session_id": id, "session": value };
        let opts = ReplaceOptions::builder().upsert(true).build();
        coll.replace_one(query, replacement, Some(opts)).await?;

        Ok(session.into_cookie_value())
    }

    async fn load_session(&self, cookie_value: String) -> Result<Option<Session>> {
        let id = Session::id_from_cookie_value(&cookie_value)?;
        let coll = self.client.database(&self.db).collection(&self.coll_name);
        let filter = doc! { "session_id": id };
        match coll.find_one(filter, None).await? {
            None => Ok(None),
            Some(doc) => Ok(Some(serde_json::from_str(doc.get_str("session")?)?)),
        }
    }

    async fn destroy_session(&self, session: Session) -> Result {
        let coll = self.client.database(&self.db).collection(&self.coll_name);
        coll.delete_one(doc! { "session_id": session.id() }, None)
            .await?;
        Ok(())
    }

    async fn clear_store(&self) -> Result {
        let coll = self.client.database(&self.db).collection(&self.coll_name);
        coll.drop(None).await?; // does this need to be followed by a create?
        Ok(())
    }
}