use std::collections::HashMap;
use database::database_service_server::DatabaseServiceServer;
use database_service::database;
use database_service::db::Database;
use database_service::grpc::MyDatabaseService;
use database_service::redis_cache::RedisCache;
use dotenv::dotenv;
use sqlx::postgres::PgPoolOptions;
use std::env;
use std::net::ToSocketAddrs;
use std::str::FromStr;
use std::sync::Arc;
use tokio::{select, signal};
use tonic::transport::Server;
use tracing::{info, Level};
use warp::Filter;
use utils::consul_registration;

#[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();

    let addr = env::var("LISTEN_ADDR").unwrap_or_else(|_| "0.0.0.0".to_string());
    let port = env::var("DATABASE_SERVICE_PORT").unwrap_or_else(|_| "50052".to_string());
    let health_port = env::var("HEALTH_CHECK_PORT").unwrap_or_else(|_| "8080".to_string());

    let database_url = std::env::var("DATABASE_URL").expect("DATABASE_URL must be set");
    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(|_| "database-service".to_string());
    let service_address = env::var("DATABASE_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 health_check_endpoint_addr = format!("{}:{}", service_address, health_port);
    
    // Register service with Consul
    let service_id = consul_registration::generate_service_id();
    let tags = vec!["version-1.0".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,
        &health_check_url,
    )
        .await?;

    // Start health-check endpoint
    let health_route = warp::path!("health")
        .map(|| warp::reply::with_status("OK", warp::http::StatusCode::OK));


    tokio::spawn(warp::serve(health_route).run(health_check_endpoint_addr.to_socket_addrs()?.next().unwrap()));

    let full_addr = format!("{}:{}", &addr, port);
    let address = full_addr.parse().expect("Invalid address");
    let pool = PgPoolOptions::new()
        .max_connections(5)
        .connect(&database_url)
        .await
        .expect("Failed to create PostgreSQL connection pool");

    let redis_cache = RedisCache::new(&redis_url);

    let cache = Arc::new(redis_cache); // Share the cache instance between tasks
    let database_service = MyDatabaseService {
        db: Database::new(pool, cache).await,
    };

    // Pass `shared_cache` into services as needed
    info!("Database Service running on {}", address);
    tokio::spawn(Server::builder()
            .add_service(DatabaseServiceServer::new(database_service))
            .serve(address));

    select! {
        _ = signal::ctrl_c() => {},
    }

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