use anyhow::Result;
use detee_shared::pb::brain::brain_app_daemon_client::BrainAppDaemonClient;
use detee_shared::pb::brain::{
    AppContract, BrainMessageApp, DaemonAuth, DaemonMessageApp, RegisterAppNodeReq,
};
use tokio::sync::mpsc::Receiver;
use tokio::sync::mpsc::Sender;
use tokio::task::JoinSet;
use tokio_stream::wrappers::ReceiverStream;
use tokio_stream::StreamExt;
use tonic::metadata::AsciiMetadataValue;
use tonic::transport::Channel;
use tonic::Request;

use crate::global::IP_INFO;
use crate::global::PUBLIC_KEY;

pub struct ConnectionData {
    pub brain_url: String,
    pub brain_msg_tx: Sender<BrainMessageApp>,
    pub daemon_msg_rx: Receiver<DaemonMessageApp>,
    pub daemon_msg_tx: Sender<DaemonMessageApp>,
    pub app_contracts_uuid: Vec<String>,
}

pub async fn register_node(config: &crate::HostConfig) -> Result<Vec<AppContract>> {
    let mut client = BrainAppDaemonClient::connect(config.brain_url.clone()).await?;

    log::debug!("registering node with brain");

    let req = RegisterAppNodeReq {
        node_pubkey: PUBLIC_KEY.to_string(),
        owner_pubkey: config.owner_wallet.clone(),
        main_ip: IP_INFO.ip.clone(),
        city: IP_INFO.city.clone(),
        region: IP_INFO.region.clone(),
        country: IP_INFO.country.clone(),
    };

    let pubkey = PUBLIC_KEY.clone();
    let timestamp = chrono::Utc::now().to_rfc3339();
    let signature = crate::global::sign_message(&format!("{timestamp}{req:?}"))?;
    let timestamp: AsciiMetadataValue = timestamp.parse()?;
    let pubkey: AsciiMetadataValue = pubkey.parse()?;
    let signature: AsciiMetadataValue = signature.parse()?;
    let mut req = Request::new(req);
    req.metadata_mut().insert("timestamp", timestamp);
    req.metadata_mut().insert("pubkey", pubkey);
    req.metadata_mut().insert("request-signature", signature);

    let mut container_contracts = vec![];

    let mut grpc_stream = client.register_app_node(req).await?.into_inner();
    while let Some(stream_update) = grpc_stream.next().await {
        match stream_update {
            Ok(contract) => {
                container_contracts.push(contract);
            }
            Err(e) => {
                println!("Brain disconnected from register_node: {e}");
            }
        }
    }
    log::info!(
        "Brain registration succcessful, with contract count: {}",
        container_contracts.len()
    );

    Ok(container_contracts)
}

pub async fn connect_and_run(conn_data: ConnectionData) -> Result<()> {
    let client = BrainAppDaemonClient::connect(conn_data.brain_url).await?;

    let mut streaming_tasks = JoinSet::new();

    streaming_tasks.spawn(receive_messages(
        client.clone(),
        conn_data.app_contracts_uuid.clone(),
        conn_data.brain_msg_tx,
    ));
    streaming_tasks.spawn(send_messages(
        client.clone(),
        conn_data.app_contracts_uuid.clone(),
        conn_data.daemon_msg_rx,
        conn_data.daemon_msg_tx,
    ));

    let task_output = streaming_tasks.join_next().await;
    println!("exiting: {task_output:?}");
    Ok(())
}

fn sign_stream_auth(contracts: Vec<String>) -> Result<DaemonAuth> {
    let pubkey = PUBLIC_KEY.clone();
    let timestamp = chrono::Utc::now().to_rfc3339();
    let signature =
        crate::global::sign_message(&(timestamp.to_string() + &format!("{contracts:?}")))?;
    Ok(DaemonAuth {
        timestamp,
        pubkey,
        contracts,
        signature,
    })
}

pub async fn receive_messages(
    mut client: BrainAppDaemonClient<Channel>,
    contracts: Vec<String>,
    tx: Sender<BrainMessageApp>,
) -> Result<()> {
    log::debug!("starting to listen for messages from brain");
    let mut grpc_stream = client
        .brain_messages(sign_stream_auth(contracts)?)
        .await?
        .into_inner();

    while let Some(stream_update) = grpc_stream.next().await {
        match stream_update {
            Ok(msg) => {
                log::info!("Received message from brain: {msg:?}");
                tx.send(msg).await?;
            }
            Err(e) => {
                println!("Brain disconnected from brain_messaages: {e}");
            }
        }
    }
    println!("brain_messages is about to exit");
    Ok(())
}

pub async fn send_messages(
    mut client: BrainAppDaemonClient<Channel>,
    contracts: Vec<String>,
    rx: Receiver<DaemonMessageApp>,
    tx: Sender<DaemonMessageApp>,
) -> Result<()> {
    let rx_stream = ReceiverStream::new(rx);
    tx.send(DaemonMessageApp {
        msg: Some(detee_shared::pb::brain::daemon_message_app::Msg::Auth(
            sign_stream_auth(contracts)?,
        )),
    })
    .await?;
    client.daemon_messages(rx_stream).await?;
    log::debug!("daemon_messages is about to exit");
    Ok(())
}