use async_std::{
    channel, future,
    io::prelude::{ReadExt, WriteExt},
    task,
};
use cyfs_base::*;
use futures::StreamExt;
use cyfs_bdt::{
    *, 
    sn::service::*
};
use std::{net::Shutdown, time::Duration};
mod utils;

async fn recv_large_stream(stack: StackGuard, sender: channel::Sender<Vec<u8>>) {
    let acceptor = stack.stream_manager().listen(0).unwrap();
    let mut incoming = acceptor.incoming();
    loop {
        let mut pre_stream = incoming.next().await.unwrap().unwrap();
        pre_stream.stream.confirm(vec![].as_ref()).await.unwrap();
        let mut buffer = vec![];
        let _ = pre_stream.stream.read_to_end(&mut buffer).await.unwrap();
        let _ = pre_stream.stream.shutdown(Shutdown::Both);
        sender.send(buffer).await.unwrap();
    }  
}

struct TestServer {

}


impl SnServiceContractServer for TestServer {
    fn check_receipt(
        &self,
        _client_device: &Device,
        _local_receipt: &SnServiceReceipt,
        _client_receipt: &Option<ReceiptWithSignature>,
        _last_request_time: &ReceiptRequestTime,
    ) -> IsAcceptClient {
        IsAcceptClient::Accept(false)
    }

    fn verify_auth(&self, _client_device_id: &DeviceId) -> IsAcceptClient {
        IsAcceptClient::Accept(false)
    }
}


#[async_std::test]
async fn call_sn_without_ping() {
    let (sn, sn_secret) = utils::create_device("5aSixgLuJjfrNKn9D4z66TEM6oxL3uNmWCWHk52cJDKR", &["W4udp127.0.0.1:10010"]).unwrap();

    let service = SnService::new(
        sn.clone(),
        sn_secret,
        Box::new(TestServer {}),
    );

    task::spawn(async move {
        let _ = service.start().await;
    });
   

    let (ln_dev, ln_secret) = utils::create_device("5aSixgLuJjfrNKn9D4z66TEM6oxL3uNmWCWHk52cJDKR", &["L4udp127.0.0.1:10011"]).unwrap();
    let (rn_dev, rn_secret) = utils::create_device("5aSixgLuJjfrNKn9D4z66TEM6oxL3uNmWCWHk52cJDKR", &["L4udp127.0.0.1:10012"]).unwrap();
    
    let mut ln_params = StackOpenParams::new("");
    ln_params.known_device = Some(vec![rn_dev.clone(), sn.clone()]);
    let ln_stack = Stack::open(
        ln_dev.clone(), 
        ln_secret, 
        ln_params).await.unwrap();


    let mut rn_params = StackOpenParams::new("");
    rn_params.known_sn = Some(vec![sn.clone()]);
    let rn_stack = Stack::open(
        rn_dev, 
        rn_secret, 
        rn_params).await.unwrap();

    assert_eq!(SnStatus::Online, rn_stack.reset_sn_list(vec![sn.clone()]).wait_online().await.unwrap());

    let (sample_size, sample) = utils::random_mem(1024, 512);
    let (signal_sender, signal_recver) = channel::bounded::<Vec<u8>>(1);
    {
        let rn_stack = rn_stack.clone();
        task::spawn(async move {
            recv_large_stream(rn_stack, signal_sender).await;
        });
    }

    let param = BuildTunnelParams {
        remote_const: rn_stack.local_const().clone(),
        remote_sn: Some(vec![sn.desc().device_id()]),
        remote_desc: None,
    };
    let mut stream = ln_stack
        .stream_manager()
        .connect(0u16, vec![], param)
        .await.unwrap();
    stream.write_all(&sample[..]).await.unwrap();

    let _ = stream.shutdown(Shutdown::Both);

    let recv_sample = future::timeout(Duration::from_secs(5), signal_recver.recv()).await.unwrap().unwrap();

    assert_eq!(recv_sample.len(), sample_size);
    let sample_hash = hash_data(sample.as_ref());
    let recv_hash = hash_data(recv_sample.as_ref());

    assert_eq!(sample_hash, recv_hash);

}





#[async_std::test]
async fn reset_sn_list() {
    let (sn1, sn1_secret) = utils::create_device("5aSixgLuJjfrNKn9D4z66TEM6oxL3uNmWCWHk52cJDKR", &["W4udp127.0.0.1:10015"]).unwrap();

    {
        let service = SnService::new(
            sn1.clone(),
            sn1_secret,
            Box::new(TestServer {}),
        );
    
        task::spawn(async move {
            let _ = service.start().await;
        });
    }
    

    let (sn2, sn2_secret) = utils::create_device("5aSixgLuJjfrNKn9D4z66TEM6oxL3uNmWCWHk52cJDKR", &["W4udp127.0.0.1:10016"]).unwrap();

    {
        let service = SnService::new(
            sn2.clone(),
            sn2_secret,
            Box::new(TestServer {}),
        );
    
        task::spawn(async move {
            let _ = service.start().await;
        });
    }
    
    let (ln_dev, ln_secret) = utils::create_device("5aSixgLuJjfrNKn9D4z66TEM6oxL3uNmWCWHk52cJDKR", &["L4udp127.0.0.1:10017"]).unwrap();

    let (rn_dev, rn_secret) = utils::create_device("5aSixgLuJjfrNKn9D4z66TEM6oxL3uNmWCWHk52cJDKR", &["L4udp127.0.0.1:10019"]).unwrap();
    
    let mut ln_params = StackOpenParams::new("");
    ln_params.known_device = Some(vec![rn_dev.clone(), sn1.clone(), sn2.clone()]);
    let ln_stack = Stack::open(
        ln_dev.clone(), 
        ln_secret, 
        ln_params).await.unwrap();
    


    let mut rn_params = StackOpenParams::new("");
    rn_params.known_sn = Some(vec![sn1.clone()]);
    let rn_stack = Stack::open(
        rn_dev, 
        rn_secret, 
        rn_params).await.unwrap();
    assert_eq!(SnStatus::Online, rn_stack.reset_sn_list(vec![sn1.clone()]).wait_online().await.unwrap());

    let (sample_size, sample) = utils::random_mem(1024, 512);
    let (signal_sender, signal_recver) = channel::bounded::<Vec<u8>>(1);
    {
        let rn_stack = rn_stack.clone();
        task::spawn(async move {
            recv_large_stream(rn_stack, signal_sender).await;
        });
    }
   

    {
        let param = BuildTunnelParams {
            remote_const: rn_stack.local_const().clone(),
            remote_sn: Some(vec![sn1.desc().device_id()]),
            remote_desc: None,
        };
        let mut stream = ln_stack
            .stream_manager()
            .connect(0u16, vec![], param)
            .await.unwrap();
        stream.write_all(&sample[..]).await.unwrap();

        let _ = stream.shutdown(Shutdown::Both);

        let recv_sample = future::timeout(Duration::from_secs(5), signal_recver.recv()).await.unwrap().unwrap();

        assert_eq!(recv_sample.len(), sample_size);
        let sample_hash = hash_data(sample.as_ref());
        let recv_hash = hash_data(recv_sample.as_ref());

        assert_eq!(sample_hash, recv_hash);
    }

    assert_eq!(SnStatus::Online, rn_stack.reset_sn_list(vec![sn2.clone()]).wait_online().await.unwrap());
    let _ = future::timeout(Duration::from_secs(1), future::pending::<()>()).await;

    {
        
        let param = BuildTunnelParams {
            remote_const: rn_stack.local_const().clone(),
            remote_sn: Some(vec![sn2.desc().device_id()]),
            remote_desc: None,
        };
        let mut stream = ln_stack
            .stream_manager()
            .connect(0u16, vec![], param)
            .await.unwrap();
        stream.write_all(&sample[..]).await.unwrap();

        let _ = stream.shutdown(Shutdown::Both);

        let recv_sample = future::timeout(Duration::from_secs(5), signal_recver.recv()).await.unwrap().unwrap();

        assert_eq!(recv_sample.len(), sample_size);
        let sample_hash = hash_data(sample.as_ref());
        let recv_hash = hash_data(recv_sample.as_ref());

        assert_eq!(sample_hash, recv_hash);
    }

}






#[async_std::test]
async fn use_next_sn() {
    let (sn1, sn1_secret) = utils::create_device("5aSixgLuJjfrNKn9D4z66TEM6oxL3uNmWCWHk52cJDKR", &["W4udp127.0.0.1:10020"]).unwrap();

    let (sn2, sn2_secret) = utils::create_device("5aSixgLuJjfrNKn9D4z66TEM6oxL3uNmWCWHk52cJDKR", &["W4udp127.0.0.1:10021"]).unwrap();


    let (ln_dev, ln_secret) = utils::create_device("5aSixgLuJjfrNKn9D4z66TEM6oxL3uNmWCWHk52cJDKR", &["L4udp127.0.0.1:10022"]).unwrap();
    let (rn_dev, rn_secret) = utils::create_device("5aSixgLuJjfrNKn9D4z66TEM6oxL3uNmWCWHk52cJDKR", &["L4udp127.0.0.1:10023"]).unwrap();

    let (sn_dev, sn_secret) = {
        let rn_id = rn_dev.desc().object_id();
        let sn1_id = sn1.desc().object_id();
        let sn2_id = sn1.desc().object_id();

        if rn_id.distance_of(&sn1_id) > rn_id.distance_of(&sn2_id) {
            (sn1.clone(), sn1_secret)
        } else {
            (sn2.clone(), sn2_secret)
        }
    };


    let service = SnService::new(
        sn_dev,
        sn_secret,
        Box::new(TestServer {}),
    );

    task::spawn(async move {
        let _ = service.start().await;
    });


    let mut ln_params = StackOpenParams::new("");
    ln_params.known_device = Some(vec![rn_dev.clone(), sn1.clone(), sn2.clone()]);
    let ln_stack = Stack::open(
        ln_dev.clone(), 
        ln_secret, 
        ln_params).await.unwrap();


    let mut rn_params = StackOpenParams::new("");
    rn_params.config.sn_client.ping.udp.resend_timeout = Duration::from_secs(1);
    rn_params.known_sn = Some(vec![sn1.clone(), sn2.clone()]);
    let rn_stack = Stack::open(
        rn_dev, 
        rn_secret, 
        rn_params).await.unwrap();

    assert_eq!(SnStatus::Online, rn_stack.reset_sn_list(vec![sn1.clone(), sn2.clone()]).wait_online().await.unwrap());

    let (sample_size, sample) = utils::random_mem(1024, 512);
    let (signal_sender, signal_recver) = channel::bounded::<Vec<u8>>(1);
    {
        let rn_stack = rn_stack.clone();
        task::spawn(async move {
            recv_large_stream(rn_stack, signal_sender).await;
        });
    }

    let param = BuildTunnelParams {
        remote_const: rn_stack.local_const().clone(),
        remote_sn: Some(vec![sn1.desc().device_id(), sn2.desc().device_id()]),
        remote_desc: None,
    };
    let mut stream = ln_stack
        .stream_manager()
        .connect(0u16, vec![], param)
        .await.unwrap();
    stream.write_all(&sample[..]).await.unwrap();

    let _ = stream.shutdown(Shutdown::Both);

    let recv_sample = future::timeout(Duration::from_secs(5), signal_recver.recv()).await.unwrap().unwrap();

    assert_eq!(recv_sample.len(), sample_size);
    let sample_hash = hash_data(sample.as_ref());
    let recv_hash = hash_data(recv_sample.as_ref());

    assert_eq!(sample_hash, recv_hash);

}




#[async_std::test]
async fn call_with_tcp() {
    let (sn, sn_secret) = utils::create_device("5aSixgLuJjfrNKn9D4z66TEM6oxL3uNmWCWHk52cJDKR", &["W4tcp127.0.0.1:10010", "L4udp127.0.0.1:10024"]).unwrap();

    let service = SnService::new(
        sn.clone(),
        sn_secret,
        Box::new(TestServer {}),
    );

    task::spawn(async move {
        let _ = service.start().await;
    });
   

    let (ln_dev, ln_secret) = utils::create_device("5aSixgLuJjfrNKn9D4z66TEM6oxL3uNmWCWHk52cJDKR", &["W4tcp127.0.0.1:10011"]).unwrap();
    let (rn_dev, rn_secret) = utils::create_device("5aSixgLuJjfrNKn9D4z66TEM6oxL3uNmWCWHk52cJDKR", &["L4udp127.0.0.1:10025", "L4tcp127.0.0.1:10012"]).unwrap();
    
    let mut ln_params = StackOpenParams::new("");
    ln_params.known_device = Some(vec![rn_dev.clone(), sn.clone()]);
    let ln_stack = Stack::open(
        ln_dev.clone(), 
        ln_secret, 
        ln_params).await.unwrap();


    let mut rn_params = StackOpenParams::new("");
    rn_params.known_sn = Some(vec![sn.clone()]);
    let rn_stack = Stack::open(
        rn_dev, 
        rn_secret, 
        rn_params).await.unwrap();

    assert_eq!(SnStatus::Online, rn_stack.reset_sn_list(vec![sn.clone()]).wait_online().await.unwrap());

    let (sample_size, sample) = utils::random_mem(1024, 512);
    let (signal_sender, signal_recver) = channel::bounded::<Vec<u8>>(1);
    {
        let rn_stack = rn_stack.clone();
        task::spawn(async move {
            recv_large_stream(rn_stack, signal_sender).await;
        });
    }

    let param = BuildTunnelParams {
        remote_const: rn_stack.local_const().clone(),
        remote_sn: Some(vec![sn.desc().device_id()]),
        remote_desc: None,
    };
    let mut stream = ln_stack
        .stream_manager()
        .connect(0u16, vec![], param)
        .await.unwrap();
    stream.write_all(&sample[..]).await.unwrap();

    let _ = stream.shutdown(Shutdown::Both);

    let recv_sample = future::timeout(Duration::from_secs(5), signal_recver.recv()).await.unwrap().unwrap();

    assert_eq!(recv_sample.len(), sample_size);
    let sample_hash = hash_data(sample.as_ref());
    let recv_hash = hash_data(recv_sample.as_ref());

    assert_eq!(sample_hash, recv_hash);

}

#[async_std::test]
async fn sn_with_ipv6() {
    let ipv6_ep = format!("D6udp[{:?}]:10027", &local_ip_address::list_afinet_netifas().unwrap()[0].1);

    let (sn, sn_secret) = utils::create_device("5aSixgLuJjfrNKn9D4z66TEM6oxL3uNmWCWHk52cJDKR", &["L4udp127.0.0.1:10027", &ipv6_ep]).unwrap();

    let service = SnService::new(
        sn.clone(),
        sn_secret,
        Box::new(TestServer {}),
    );

    task::spawn(async move {
        let _ = service.start().await;
    });
   

    let (ln_dev, ln_secret) = utils::create_device("5aSixgLuJjfrNKn9D4z66TEM6oxL3uNmWCWHk52cJDKR", &["L4udp127.0.0.1:10028", "D6udp[::]:10025", "D6tcp[::]:10028"]).unwrap();
    let (rn_dev, rn_secret) = utils::create_device("5aSixgLuJjfrNKn9D4z66TEM6oxL3uNmWCWHk52cJDKR", &["L4udp127.0.0.1:10029", "D6udp[::]:10026", "D6tcp[::]:10029"]).unwrap();
    
    let mut ln_params = StackOpenParams::new("");
    ln_params.config.interface.udp.sn_only = true;
    ln_params.known_device = Some(vec![rn_dev.clone(), sn.clone()]);
    let ln_stack = Stack::open(
        ln_dev.clone(), 
        ln_secret, 
        ln_params).await.unwrap();


    let mut rn_params = StackOpenParams::new("");
    rn_params.known_sn = Some(vec![sn.clone()]);
    let rn_stack = Stack::open(
        rn_dev, 
        rn_secret, 
        rn_params).await.unwrap();

    assert_eq!(SnStatus::Online, rn_stack.reset_sn_list(vec![sn.clone()]).wait_online().await.unwrap());

    let (sample_size, sample) = utils::random_mem(1024, 512);
    let (signal_sender, signal_recver) = channel::bounded::<Vec<u8>>(1);
    {
        let rn_stack = rn_stack.clone();
        task::spawn(async move {
            recv_large_stream(rn_stack, signal_sender).await;
        });
    }

    let param = BuildTunnelParams {
        remote_const: rn_stack.local_const().clone(),
        remote_sn: Some(vec![sn.desc().device_id()]),
        remote_desc: None,
    };
    let mut stream = ln_stack
        .stream_manager()
        .connect(0u16, vec![], param)
        .await.unwrap();
    stream.write_all(&sample[..]).await.unwrap();

    let _ = stream.shutdown(Shutdown::Both);

    let recv_sample = future::timeout(Duration::from_secs(5), signal_recver.recv()).await.unwrap().unwrap();

    assert_eq!(recv_sample.len(), sample_size);
    let sample_hash = hash_data(sample.as_ref());
    let recv_hash = hash_data(recv_sample.as_ref());

    assert_eq!(sample_hash, recv_hash);
}



#[async_std::test]
async fn sn_with_no_endpoint() {
    let (sn, sn_secret) = utils::create_device("5aSixgLuJjfrNKn9D4z66TEM6oxL3uNmWCWHk52cJDKR", &["W4udp127.0.0.1:10030", ]).unwrap();

    let service = SnService::new(
        sn.clone(),
        sn_secret,
        Box::new(TestServer {}),
    );

    task::spawn(async move {
        let _ = service.start().await;
    });
   

    let (ln_dev, ln_secret) = utils::create_device("5aSixgLuJjfrNKn9D4z66TEM6oxL3uNmWCWHk52cJDKR", &["L4udp127.0.0.1:10031"]).unwrap();
    let (rn_dev, rn_secret) = utils::create_device("5aSixgLuJjfrNKn9D4z66TEM6oxL3uNmWCWHk52cJDKR", &["L4udp127.0.0.1:10031"]).unwrap();
    
    let mut ln_params = StackOpenParams::new("");
    ln_params.config.interface.udp.sn_only = true;
    ln_params.known_device = Some(vec![sn.clone()]);
    let _ln_stack = Stack::open(
        ln_dev.clone(), 
        ln_secret, 
        ln_params).await.unwrap();

    let mut rn_params = StackOpenParams::new("");
    rn_params.known_sn = Some(vec![sn.clone()]);
    let rn_stack = Stack::open(
        rn_dev, 
        rn_secret, 
        rn_params).await.unwrap();


    assert!(rn_stack.reset_sn_list(vec![sn.clone()]).wait_online().await.is_err());
}