mod session_service;

use dotenv::dotenv;
use std::collections::HashMap;
use std::env;
use std::str::FromStr;
use std::sync::Arc;
use tokio::{select, signal};
use tokio::sync::Mutex;
use tonic::transport::Server;
use tracing::{info, Level};
use utils::consul_registration;
use utils::redis_cache::RedisCache;
use utils::service_discovery::get_service_address;
use crate::api::session_service_server::SessionServiceServer;
use crate::session_service::SessionServiceImpl;

pub mod api {
    tonic::include_proto!("session_service_api");
}

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    dotenv().ok();
    tracing_subscriber::fmt()
        .with_max_level(Level::from_str(&env::var("LOG_LEVEL").unwrap_or_else(|_| "info".to_string())).unwrap_or_else(|_| Level::INFO))
        .init();

    // Set the gRPC server address
    let addr = env::var("LISTEN_ADDR").unwrap_or_else(|_| "0.0.0.0".to_string());
    let port = env::var("SESSION_SERVICE_PORT").unwrap_or_else(|_| "50055".to_string());
    let health_port = env::var("HEALTH_CHECK_PORT").unwrap_or_else(|_| "8084".to_string());
    
    let redis_url = std::env::var("REDIS_URL").unwrap_or_else(|_| "redis://127.0.0.1:6379".to_string());
    let consul_url = env::var("CONSUL_URL").unwrap_or_else(|_| "http://127.0.0.1:8500".to_string());
    let service_name = env::var("SERVICE_NAME").unwrap_or_else(|_| "session-service".to_string());
    let service_address = env::var("SESSION_SERVICE_ADDR").unwrap_or_else(|_| "127.0.0.1".to_string());
    let service_port = port.clone();
    let health_check_url = format!("http://{}:{}/health", service_address, health_port);

    // Register service with Consul
    let service_id = consul_registration::get_or_generate_service_id(env!("CARGO_PKG_NAME"));
    let version = env!("CARGO_PKG_VERSION").to_string();
    let tags = vec![version];
    let meta = HashMap::new();
    consul_registration::register_service(
        &consul_url,
        service_id.as_str(),
        service_name.as_str(),
        service_address.as_str(),
        service_port.parse().unwrap_or(50055),
        tags,
        meta,
        &health_check_url,
    )
        .await?;

    // Start health-check endpoint
    consul_registration::start_health_check(addr.as_str()).await?;

    let full_addr = format!("{}:{}", &addr, port);
    let address = full_addr.parse().expect("Invalid address");
    let redis_cache = Arc::new(Mutex::new(RedisCache::new(&redis_url)));
    let session_service =  SessionServiceImpl {
        redis: redis_cache
    };

    tokio::spawn(Server::builder()
        .add_service(SessionServiceServer::new(session_service))
        .serve(address));

    utils::signal_handler::wait_for_signal().await;

    consul_registration::deregister_service(&consul_url, service_id.as_str()).await.expect("");
    Ok(())
}