use std::{ops::Deref, sync::Arc};

use stack_up::{Configuration, Services};
use tokio::task::JoinHandle;
use tower_sessions::{CachingSessionStore, ExpiredDeletion, session_store};
use tower_sessions_moka_store::MokaStore;
use tower_sessions_sqlx_store::PostgresStore;

use crate::{
    client::{OauthClient, discord::discord_client},
    cnfg::LocalConfig,
    error::AppError,
};

#[derive(Clone)]
pub struct AppHandle(Arc<AppState>);

impl Deref for AppHandle {
    type Target = Arc<AppState>;

    fn deref(&self) -> &Self::Target {
        &self.0
    }
}

pub struct AppState {
    pub services: Services,
    pub local_config: LocalConfig,
    pub discord_client: OauthClient,
    pub http_client: reqwest::Client,
    pub session_store: CachingSessionStore<MokaStore, PostgresStore>,
}

impl AppState {
    pub async fn create(
        services: Services,
        configuration: &Configuration,
    ) -> Result<(AppHandle, JoinHandle<Result<(), session_store::Error>>), AppError> {
        let local_config: LocalConfig = serde_json::from_value(configuration.misc.clone())?;

        let session_store_db =
            tower_sessions_sqlx_store::PostgresStore::new(services.postgres.clone());
        session_store_db.migrate().await?;
        let deletion_task = tokio::task::spawn(
            session_store_db
                .clone()
                .continuously_delete_expired(tokio::time::Duration::from_secs(60)),
        );
        let session_store_mem = MokaStore::new(Some(100));

        let store = CachingSessionStore::new(session_store_mem, session_store_db);

        let discord_client = discord_client(&local_config.oauth.discord)?;

        Ok((
            AppHandle(Arc::new(Self {
                services,
                local_config,
                discord_client,
                http_client: reqwest::Client::new(),
                session_store: store,
            })),
            deletion_task,
        ))
    }
}