use crate::auth_client::AuthClient;
use crate::bufferpool::BufferPool;
use crate::character_client::CharacterClient;
use crate::connection_service::ConnectionService;
use crate::metrics::{ACTIVE_CONNECTIONS, PACKETS_RECEIVED};
use crate::packet::Packet;
use crate::router::PacketRouter;
use dotenv::dotenv;
use prometheus::{self, Encoder, TextEncoder};
use prometheus_exporter;
use std::collections::HashMap;
use std::env;
use std::error::Error;
use std::net::ToSocketAddrs;
use std::str::FromStr;
use std::sync::Arc;
use tokio::io::AsyncReadExt;
use tokio::net::{TcpListener, TcpStream};
use tokio::sync::{Mutex, Semaphore};
use tokio::{io, select, signal};
use tracing::Level;
use tracing::{debug, error, info, warn};
use tracing_subscriber::EnvFilter;
use utils::service_discovery::get_kube_service_endpoints_by_dns;
use utils::{health_check, logging};
use warp::Filter;

mod auth_client;
mod bufferpool;
mod character_client;
mod connection_service;
mod connection_state;
mod dataconsts;
mod enums;
mod handlers;
mod metrics;
mod packet;
mod packet_type;
mod packets;
mod router;
mod types;
mod interceptors;
mod id_manager;

pub mod common {
    tonic::include_proto!("common");
}
pub mod auth {
    tonic::include_proto!("auth");
}
pub mod character_common {
    tonic::include_proto!("character_common");
}
pub mod character {
    tonic::include_proto!("character");
}

const BUFFER_POOL_SIZE: usize = 1000;
const MAX_CONCURRENT_CONNECTIONS: usize = 100;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    dotenv().ok();
    let app_name = env!("CARGO_PKG_NAME");
    logging::setup_logging(app_name, &["packet_service", "health_check"]);

    // Set the gRPC server address
    let addr = env::var("LISTEN_ADDR").unwrap_or_else(|_| "0.0.0.0".to_string());
    let port = env::var("SERVICE_PORT").unwrap_or_else(|_| "29000".to_string());
    let metrics_port = env::var("PACKET_METRICS_PORT").unwrap_or_else(|_| "4001".to_string());
    let auth_url = format!(
        "http://{}",
        get_kube_service_endpoints_by_dns("auth-service", "tcp", "auth-service")
            .await?
            .get(0)
            .unwrap()
    );
    let character_url = format!(
        "http://{}",
        get_kube_service_endpoints_by_dns("character-service", "tcp", "character-service")
            .await?
            .get(0)
            .unwrap()
    );

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

    let auth_client = Arc::new(Mutex::new(AuthClient::connect(&auth_url).await?));
    let character_client = Arc::new(Mutex::new(CharacterClient::connect(&character_url).await?));

    let full_addr = format!("{}:{}", &addr, port);

    tokio::spawn(async move {
        let semaphore = Arc::new(Semaphore::new(MAX_CONCURRENT_CONNECTIONS));
        let listener = TcpListener::bind(full_addr.clone()).await.unwrap();
        let buffer_pool = BufferPool::new(BUFFER_POOL_SIZE);
        let connection_service = Arc::new(ConnectionService::new());

        let packet_router = PacketRouter {
            auth_client,
            character_client,
            connection_service,
        };

        info!("Packet service listening on {}", full_addr);

        loop {
            let (mut socket, addr) = listener.accept().await.unwrap();
            let packet_router = packet_router.clone();
            info!("New connection from {}", addr);

            let pool = buffer_pool.clone();
            let permit = semaphore.clone().acquire_owned().await.unwrap();
            let peer_addr = socket.peer_addr().unwrap();
            let (mut reader, writer) = io::split(socket);
            let writer = Arc::new(tokio::sync::Mutex::new(writer));

            // Spawn a new task for each connection
            tokio::spawn(async move {
                let _permit = permit;
                let connection_id = packet_router.connection_service.add_connection(writer);
                if let Err(e) = packet_router
                    .handle_connection(reader, pool, connection_id.clone(), peer_addr.to_string())
                    .await
                {
                    error!("Error handling connection: {}", e);
                }
                packet_router.connection_service.remove_connection(&connection_id);
            });
        }
    });

    let binding = format!("{}:{}", &addr, metrics_port);
    prometheus_exporter::start(binding.parse().unwrap()).unwrap();

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