/*
 * authservice main.rs
 * - entrypoint for the asklyphe authentication service
 *
 * Copyright (C) 2025 Real Microsoft, LLC
 *
 * This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, version 3.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License along with this program. If not, see <https://www.gnu.org/licenses/>.
*/

mod process;
pub mod db;
mod email;

use std::string::ToString;
use std::sync::Arc;
use std::sync::atomic::{AtomicI64, AtomicU64, Ordering};
use asklyphe_common::nats::authservice::AuthServiceResponse;
use async_nats::jetstream;
use log::{debug, error, info, warn};
use once_cell::sync::Lazy;
use asklyphe_common::nats::comms;
use sea_orm::Database;
use crate::email::email_init;

pub static NATS_URL: Lazy<String> = Lazy::new(|| std::env::var("NATS_URL").expect("NO NATS DEFINED"));
pub static NATS_CERT: Lazy<String> = Lazy::new(|| std::env::var("NATS_CERT").expect("NO NATS_CERT DEFINED"));
pub static NATS_KEY: Lazy<String> = Lazy::new(|| std::env::var("NATS_KEY").expect("NO NATS_KEY DEFINED"));
pub static DB_URL: Lazy<String> = Lazy::new(|| std::env::var("DB_URL").expect("NO DB_URL DEFINED"));

pub static SMTP_DISABLE: Lazy<bool> = Lazy::new(|| std::env::var("SMTP_DISABLE").is_ok());
pub static SMTP_URL: Lazy<String> = Lazy::new(|| std::env::var("SMTP_URL").expect("NO SMTP_URL DEFINED"));
pub static SMTP_USERNAME: Lazy<String> = Lazy::new(|| std::env::var("SMTP_USERNAME").expect("NO SMTP_USERNAME DEFINED"));
pub static SMTP_PASSWORD: Lazy<String> = Lazy::new(|| std::env::var("SMTP_PASSWORD").expect("NO SMTP_PASSWORD DEFINED"));

pub static PROCESSES_HANDLED: AtomicU64 = AtomicU64::new(0);
pub static LAST_MESSAGE: AtomicI64 = AtomicI64::new(0);

#[tokio::main]
async fn main() {
    env_logger::init();
    info!("authservice began at {}", chrono::Utc::now().to_string());

    let nats = async_nats::ConnectOptions::new()
        .add_client_certificate(NATS_CERT.as_str().into(), NATS_KEY.as_str().into())
        .connect(NATS_URL.as_str())
        .await;
    if let Err(e) = nats {
        error!("FATAL ERROR, COULDN'T CONNECT TO NATS: {}", e);
        return;
    }
    let nats = nats.unwrap();
    let nats = jetstream::new(nats);
    
    email_init().await;

    info!("authservice thread spawned");

    async fn on_recv(query: comms::Query) -> comms::ServiceResponse {
        debug!("recv");
        let db = Database::connect(DB_URL.as_str()).await;
        if let Err(e) = db {
            error!("FATAL ERROR, COULDN'T CONNECT TO DATABASE: {e}");
            return comms::ServiceResponse::AuthService(AuthServiceResponse::OtherError("FATAL ERROR, COULDN'T CONNECT TO DATABASE".to_string()));
        }
        let db = db.unwrap();
        let now = chrono::Utc::now().timestamp();
        LAST_MESSAGE.store(now, Ordering::Relaxed);

        let response = match query {
            comms::Query::AuthService(query) => {
                process::process(query, db).await
            }
            _ => {
                AuthServiceResponse::InvalidRequest
            }
        };

        if PROCESSES_HANDLED.load(Ordering::Relaxed) % 100 == 0 {
            info!("handled {} requests!", PROCESSES_HANDLED.load(Ordering::Relaxed));
        }
        PROCESSES_HANDLED.fetch_add(1, Ordering::Relaxed);
        comms::ServiceResponse::AuthService(response)
    }

    if let Err(e) = comms::subscribe_service(comms::Service::AuthService, &nats, Arc::new(on_recv)).await {
        error!("failed to subscribe to authservice nats! reason {:?}", e);
    }
}