#![allow(dead_code)]

pub mod brain {
    tonic::include_proto!("brain");
}

use crate::data::BrainData;
use brain::brain_cli_service_server::BrainCliService;
use brain::brain_daemon_service_server::BrainDaemonService;
use brain::*;
use log::debug;
use log::info;
use std::pin::Pin;
use std::sync::Arc;
use tokio::sync::mpsc;
use tokio_stream::{wrappers::ReceiverStream, Stream, StreamExt};
use tonic::{Request, Response, Status, Streaming};

pub struct BrainDaemonMock {
    data: Arc<BrainData>,
}

impl BrainDaemonMock {
    pub fn new(data: Arc<BrainData>) -> Self {
        Self { data }
    }
}

pub struct BrainCliMock {
    data: Arc<BrainData>,
}

impl BrainCliMock {
    pub fn new(data: Arc<BrainData>) -> Self {
        Self { data }
    }
}

#[tonic::async_trait]
impl BrainDaemonService for BrainDaemonMock {
    async fn register_node(
        &self,
        req: Request<RegisterNodeRequest>,
    ) -> Result<Response<Empty>, Status> {
        self.data.insert_node(req.into_inner());
        Ok(Response::new(Empty {}))
    }

    type GetNewVMReqsStream = Pin<Box<dyn Stream<Item = Result<NewVmRequest, Status>> + Send>>;

    async fn get_new_vm_reqs(
        &self,
        req: Request<NodePubkey>,
    ) -> Result<Response<Self::GetNewVMReqsStream>, Status> {
        let req = req.into_inner();
        info!("Daemon {} requested GetNewVMReqsStream", req.node_pubkey);
        let (grpc_tx, grpc_rx) = mpsc::channel(6);
        let (data_tx, mut data_rx) = mpsc::channel(6);
        self.data
            .clone()
            .add_daemon_newvm_tx(&req.node_pubkey, data_tx)
            .await;
        tokio::spawn(async move {
            while let Some(newvmreq) = data_rx.recv().await {
                debug!(
                    "received this newvmreq to {}: {newvmreq:?}",
                    req.node_pubkey
                );
                let _ = grpc_tx.send(Ok(newvmreq)).await;
            }
        });
        let output_stream = ReceiverStream::new(grpc_rx);
        Ok(Response::new(
            Box::pin(output_stream) as Self::GetNewVMReqsStream
        ))
    }

    async fn send_vm_confirmations(
        &self,
        req: Request<Streaming<NewVmConfirmation>>,
    ) -> Result<Response<Empty>, Status> {
        debug!("Some node connected to stream NewVmConfirmation");
        let mut confirmations = req.into_inner();
        while let Some(confirmation) = confirmations.next().await {
            match confirmation {
                Ok(c) => {
                    info!("Received confirmation from daemon: {c:?}");
                    self.data.submit_vmconfirmation(c).await;
                }
                Err(e) => log::warn!("Daemon disconnected from Streaming<NewVmConfirmation>: {e:?}"),
            }
        }
        Ok(Response::new(Empty {}))
    }

    type DeletedVMUpdatesStream =
        Pin<Box<dyn Stream<Item = Result<DeletedVmUpdate, Status>> + Send>>;

    async fn deleted_vm_updates(
        &self,
        req: Request<NodePubkey>,
    ) -> Result<Response<Self::DeletedVMUpdatesStream>, Status> {
        let node_pubkey = req.into_inner().node_pubkey;
        info!("Daemon {node_pubkey} requested DeletedVMUpdatesStream");
        let (grpc_tx, grpc_rx) = mpsc::channel(6);
        let (data_tx, mut data_rx) = mpsc::channel(6);
        self.data
            .clone()
            .add_daemon_deletevm_tx(&node_pubkey, data_tx);
        tokio::spawn(async move {
            while let Some(deleted_vm) = data_rx.recv().await {
                match grpc_tx.send(Ok(deleted_vm.clone())).await {
                    Ok(_) => debug!(
                        "Sent delete_vm confirmation to {}: {:?}",
                        node_pubkey, deleted_vm
                    ),
                    Err(e) => log::error!(
                        "Could not send delete_vm confirmation {:?} to {} because of error: {:?}",
                        deleted_vm,
                        node_pubkey,
                        e
                    ),
                }
            }
        });
        let output_stream = ReceiverStream::new(grpc_rx);
        Ok(Response::new(
            Box::pin(output_stream) as Self::DeletedVMUpdatesStream
        ))
    }

    type ListVMContractsStream = Pin<Box<dyn Stream<Item = Result<VmContract, Status>> + Send>>;

    async fn list_vm_contracts(
        &self,
        req: Request<ListVmContractsReq>,
    ) -> Result<Response<Self::ListVMContractsStream>, Status> {
        let req = req.into_inner();
        info!("Node {} requested ListVMContractsStream", req.node_pubkey);
        let contracts = self.data.find_contracts_by_admin_pubkey(&req.node_pubkey);
        let (tx, rx) = mpsc::channel(6);
        tokio::spawn(async move {
            for contract in contracts {
                let _ = tx.send(Ok(contract.into())).await;
            }
        });
        let output_stream = ReceiverStream::new(rx);
        Ok(Response::new(
            Box::pin(output_stream) as Self::ListVMContractsStream
        ))
    }
}

#[tonic::async_trait]
impl BrainCliService for BrainCliMock {
    async fn create_vm_contract(
        &self,
        req: Request<NewVmRequest>,
    ) -> Result<Response<NewVmConfirmation>, Status> {
        let req = req.into_inner();
        info!("New VM requested via CLI: {req:?}");
        let admin_pubkey = req.admin_pubkey.clone();
        let (engine_tx, engine_rx) = tokio::sync::oneshot::channel();
        if !self.data.submit_newvmrequest(req, engine_tx).await {
            return Err(Status::unavailable(
                "The node you picked is currently offline.",
            ));
        }
        if let Ok(response) = engine_rx.await {
            info!("Sending VM confirmation to {admin_pubkey}: {response:?}");
            return Ok(Response::new(response));
        }
        self.data.del_cli_vmcontract_tx(&admin_pubkey);
        Err(Status::unknown(
            "Request failed due to unknown error. Please try again or contact the DeTEE devs team.",
        ))
    }

    type ListVMContractsStream = Pin<Box<dyn Stream<Item = Result<VmContract, Status>> + Send>>;
    async fn list_vm_contracts(
        &self,
        req: Request<ListVmContractsReq>,
    ) -> Result<Response<Self::ListVMContractsStream>, Status> {
        let req = req.into_inner();
        info!("CLI {} requested ListVMContractsStream", req.admin_pubkey);
        let contracts = self.data.find_contracts_by_admin_pubkey(&req.admin_pubkey);
        let (tx, rx) = mpsc::channel(6);
        tokio::spawn(async move {
            for contract in contracts {
                let _ = tx.send(Ok(contract.into())).await;
            }
        });
        let output_stream = ReceiverStream::new(rx);
        Ok(Response::new(
            Box::pin(output_stream) as Self::ListVMContractsStream
        ))
    }

    type ListNodesStream = Pin<Box<dyn Stream<Item = Result<NodeListResp, Status>> + Send>>;
    async fn list_nodes(
        &self,
        req: Request<NodeFilters>,
    ) -> Result<Response<Self::ListNodesStream>, tonic::Status> {
        let req = req.into_inner();
        info!("Unknown CLI requested ListNodesStream: {req:?}");
        let nodes = self.data.find_nodes_by_filters(&req);
        let (tx, rx) = mpsc::channel(6);
        tokio::spawn(async move {
            for node in nodes {
                let _ = tx.send(Ok(node.into())).await;
            }
        });
        let output_stream = ReceiverStream::new(rx);
        Ok(Response::new(
            Box::pin(output_stream) as Self::ListNodesStream
        ))
    }

    async fn delete_vm(&self, req: Request<DeletedVmUpdate>) -> Result<Response<Empty>, Status> {
        let req = req.into_inner();
        info!("Unknown CLI requested to delete vm {}", req.uuid);
        self.data.delete_vm(req).await;
        Ok(Response::new(Empty {}))
    }
}