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::{select, signal};
use tracing::Level;
use tracing::{debug, error, info, warn};
use utils::consul_registration;
use utils::service_discovery::get_service_address;
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;

pub mod common {
    tonic::include_proto!("common");
}
pub mod auth {
    tonic::include_proto!("auth"); // Path matches the package name in auth.proto
}
pub mod character_common {
    tonic::include_proto!("character_common"); // Path matches the package name in auth.proto
}
pub mod character {
    tonic::include_proto!("character"); // Path matches the package name in auth.proto
}

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();
    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("PACKET_SERVICE_PORT").unwrap_or_else(|_| "4000".to_string());
    let metrics_port = env::var("PACKET_METRICS_PORT").unwrap_or_else(|_| "4001".to_string());
    let health_port = env::var("HEALTH_CHECK_PORT").unwrap_or_else(|_| "8082".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(|_| "packet-service".to_string());
    let service_address =
        env::var("PACKET_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);
    let auth_node = get_service_address(&consul_url, "auth-service").await?;
    let character_node = get_service_address(&consul_url, "character-service").await?;

    // 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, "tcp".to_string()];
    let mut 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(50052),
        tags,
        meta,
        Some("http"),
        Some(&health_check_url),
    )
        .await?;

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

    let auth_address = auth_node.get(0).unwrap();
    let auth_url = format!(
        "http://{}:{}",
        auth_address.ServiceAddress, auth_address.ServicePort
    );
    let auth_client = Arc::new(Mutex::new(AuthClient::connect(&auth_url).await?));

    let character_address = character_node.get(0).unwrap();
    let character_url = format!(
        "http://{}:{}",
        character_address.ServiceAddress, character_address.ServicePort
    );
    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();

            // Spawn a new task for each connection
            tokio::spawn(async move {
                let _permit = permit;
                let connection_id = packet_router.connection_service.add_connection();
                if let Err(e) = packet_router
                    .handle_connection(&mut socket, pool, connection_id.clone())
                    .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;

    consul_registration::deregister_service(&consul_url, service_id.as_str())
        .await
        .expect("");
    info!("service {} deregistered", service_name);
    Ok(())
}