use crate::constants::{ACCOUNT, APP_NODE, DEFAULT_ENDPOINT};
use crate::db::app::ActiveApp;
use crate::db::prelude as db;
use crate::grpc::{check_sig_from_parts, check_sig_from_req};
use detee_shared::app_proto::brain_app_cli_server::BrainAppCli;
use detee_shared::app_proto::brain_app_daemon_server::BrainAppDaemon;
use detee_shared::app_proto::*;
use detee_shared::common_proto::Empty;
use log::info;
use std::pin::Pin;
use std::sync::Arc;
use surrealdb::engine::remote::ws::Client;
use surrealdb::RecordId;
use surrealdb::Surreal;
use tokio::sync::mpsc;
use tokio_stream::wrappers::ReceiverStream;
use tokio_stream::{Stream, StreamExt};
use tonic::{Request, Response, Status, Streaming};

pub struct AppDaemonServer {
    pub db: Arc<Surreal<Client>>,
}

impl AppDaemonServer {
    pub fn new(db: Arc<Surreal<Client>>) -> Self {
        Self { db }
    }
}

#[tonic::async_trait]
impl BrainAppDaemon for AppDaemonServer {
    type RegisterAppNodeStream = Pin<Box<dyn Stream<Item = Result<DelAppReq, Status>> + Send>>;
    type BrainMessagesStream = Pin<Box<dyn Stream<Item = Result<BrainMessageApp, Status>> + Send>>;

    async fn register_app_node(
        &self,
        req: Request<RegisterAppNodeReq>,
    ) -> Result<Response<<Self as BrainAppDaemon>::RegisterAppNodeStream>, Status> {
        let req = check_sig_from_req(req)?;
        info!("Starting app_node registration process for {:?}", req);

        let app_node = db::AppNode {
            id: RecordId::from((APP_NODE, req.node_pubkey.clone())),
            operator: RecordId::from((ACCOUNT, req.operator_wallet)),
            pub_sub_node: std::env::var("BRAIN_PUBLIC_ENDPOINT")
                .unwrap_or(DEFAULT_ENDPOINT.to_string()),
            country: req.country,
            region: req.region,
            city: req.city,
            ip: req.main_ip,
            price: req.price,

            avail_mem_mb: 0,
            avail_vcpus: 0,
            avail_storage_gbs: 0,
            avail_ports: 0,
            max_ports_per_app: 0,
            offline_minutes: 0,
        };

        app_node.register(&self.db).await?;
        info!("Sending existing contracts to {}", req.node_pubkey);

        let deleted_apps = db::DeletedApp::list_by_node(&self.db, &req.node_pubkey).await?;
        let (tx, rx) = mpsc::channel(6);
        tokio::spawn(async move {
            for deleted_app in deleted_apps {
                let _ = tx.send(Ok(deleted_app.into())).await;
            }
        });

        let resp_stream = ReceiverStream::new(rx);
        Ok(Response::new(Box::pin(resp_stream)))
    }

    async fn brain_messages(
        &self,
        req: Request<DaemonAuth>,
    ) -> Result<Response<<Self as BrainAppDaemon>::BrainMessagesStream>, Status> {
        let auth = req.into_inner();
        let pubkey = auth.pubkey.clone();
        check_sig_from_parts(
            &pubkey,
            &auth.timestamp,
            &format!("{:?}", auth.contracts),
            &auth.signature,
        )?;

        info!("App Daemon {} connected to receive brain messages", pubkey);

        let (tx, rx) = mpsc::channel(6);
        {
            let db = self.db.clone();
            let pubkey = pubkey.clone();
            let tx = tx.clone();
            tokio::spawn(async move {
                let _ = db::live_appnode_msgs::<db::NewAppReq>(&db, &pubkey, tx).await;
            });
        }
        {
            let db = self.db.clone();
            let pubkey = pubkey.clone();
            let tx = tx.clone();
            tokio::spawn(async move {
                let _ = db::live_appnode_msgs::<db::DeletedApp>(&db, &pubkey, tx).await;
            });
        }

        let resp_stream = ReceiverStream::new(rx).map(|msg| Ok(msg.into()));
        Ok(Response::new(Box::pin(resp_stream)))
    }

    async fn daemon_messages(
        &self,
        req: Request<Streaming<DaemonMessageApp>>,
    ) -> Result<Response<Empty>, Status> {
        let mut req_stream = req.into_inner();
        let pubkey: String;
        if let Some(Ok(msg)) = req_stream.next().await {
            log::debug!("App daemon_messages received auth message: {msg:?}");
            if let Some(daemon_message_app::Msg::Auth(auth)) = msg.msg {
                pubkey = auth.pubkey.clone();
                check_sig_from_parts(
                    &pubkey,
                    &auth.timestamp,
                    &format!("{:?}", &auth.contracts),
                    &auth.signature,
                )?;
            } else {
                return Err(Status::unauthenticated(
                    "Could not authenticate the app daemon: could not extract auth signature",
                ));
            }
        } else {
            return Err(Status::unauthenticated("Could not authenticate the app daemon"));
        }

        while let Some(daemon_message) = req_stream.next().await {
            match daemon_message {
                Ok(msg) => match msg.msg {
                    Some(daemon_message_app::Msg::NewAppRes(new_app_resp)) => {
                        if !new_app_resp.error.is_empty() {
                            db::NewAppReq::submit_error(
                                &self.db,
                                &new_app_resp.uuid,
                                new_app_resp.error,
                            )
                            .await?;
                        } else {
                            db::ActiveApp::activate(&self.db, new_app_resp).await?;
                        }
                    }
                    Some(daemon_message_app::Msg::AppNodeResources(app_node_resources)) => {
                        let node_resource: db::AppNodeResources = app_node_resources.into();
                        node_resource.merge(&self.db, &pubkey).await?;
                    }
                    _ => {}
                },

                Err(e) => {
                    log::warn!("App Daemon Disconnected: {e:?}")
                }
            }
        }

        Ok(Response::new(Empty {}))
    }
}

pub struct AppCliServer {
    pub db: Arc<Surreal<Client>>,
}

impl AppCliServer {
    pub fn new(db: Arc<Surreal<Client>>) -> Self {
        Self { db }
    }
}

#[tonic::async_trait]
impl BrainAppCli for AppCliServer {
    type ListAppContractsStream = Pin<Box<dyn Stream<Item = Result<AppContract, Status>> + Send>>;
    type ListAppNodesStream = Pin<Box<dyn Stream<Item = Result<AppNodeListResp, Status>> + Send>>;

    async fn new_app(&self, req: Request<NewAppReq>) -> Result<Response<NewAppRes>, Status> {
        let req = check_sig_from_req(req)?;

        let id = surrealdb::RecordId::from((APP_NODE, req.node_pubkey.clone()));
        if let Some(redirect) = db::check_pubsub_node(&self.db, id).await? {
            log::info!("redirect: {redirect}");
            return Err(redirect);
        }

        // TODO: make it atleast 1 hour
        if req.locked_nano < 100 {
            log::error!("locking lessthan 100 nano lps: {}", req.locked_nano);
            return Err(Status::unknown("lock atleaset 100 nano lps"));
        }
        info!("new_app process starting for {:?}", req);
        if db::Account::is_banned_by_node(&self.db, &req.admin_pubkey, &req.node_pubkey).await? {
            return Err(Status::permission_denied("This operator banned you. What did you do?"));
        }

        let db_req: db::NewAppReq = req.into();
        let id = db_req.id.key().to_string();

        let (tx, rx) = tokio::sync::oneshot::channel();
        let db = self.db.clone();
        tokio::spawn(async move {
            let _ = tx.send(db::WrappedAppResp::listen(&db, &id).await);
        });
        db_req.submit(&self.db).await?;

        match rx.await {
            Ok(Ok(db::WrappedAppResp::NewAppRes(new_app_resp))) => Ok(Response::new(new_app_resp)),
            Ok(Ok(db::WrappedAppResp::Error(err))) => Ok(Response::new(err)),
            Ok(Err(db::Error::TimeOut(_))) => Err(Status::deadline_exceeded(
                "Network timeout. Please try again later or contact the DeTEE devs team.",
            )),
            Ok(Err(e)) => {
                log::error!("Something weird happened during CLI NewAppReq. Reached error {e:?}");
                Err(Status::unknown(
                    "Unknown error. Please try again or contact the DeTEE devs team.",
                ))
            }
            Err(e) => {
                log::error!("Something weird happened during CLI NewAppReq. Reached error {e:?}");
                Err(Status::unknown(
                    "Unknown error. Please try again or contact the DeTEE devs team.",
                ))
            }
        }
    }

    async fn delete_app(&self, req: Request<DelAppReq>) -> Result<Response<Empty>, Status> {
        let req = check_sig_from_req(req)?;
        let app_node = db::ActiveApp::get_by_uuid(&self.db, &req.uuid)
            .await?
            .ok_or(Status::permission_denied("Unauthorized"))?
            .app_node;

        if let Some(redirect) = db::check_pubsub_node(&self.db, app_node).await? {
            log::info!("redirect: {redirect}");
            return Err(redirect);
        }
        info!("delete_app process starting for {:?}", req);
        match ActiveApp::delete(&self.db, &req.admin_pubkey, &req.uuid).await {
            Ok(()) => Ok(Response::new(Empty {})),
            Err(db::Error::AccessDenied) => Err(Status::permission_denied("Unauthorized")),
            Err(e) => {
                log::error!("Error deleting app contract {}: {e}", &req.uuid);
                Err(Status::unknown(
                    "Unknown error. Please try again or contact the DeTEE devs team.",
                ))
            }
        }
    }

    async fn list_app_contracts(
        &self,
        req: Request<ListAppContractsReq>,
    ) -> Result<Response<<Self as BrainAppCli>::ListAppContractsStream>, Status> {
        let req = check_sig_from_req(req)?;
        info!("list_app_contracts process starting for {:?}", req);

        let mut app_contracts = Vec::new();

        if !req.uuid.is_empty() {
            if let Some(app_contract) =
                db::ActiveAppWithNode::get_by_uuid(&self.db, &req.uuid).await?
            {
                if app_contract.admin.key().to_string() == req.admin_pubkey
                    || app_contract.app_node.operator.key().to_string() == req.admin_pubkey
                {
                    app_contracts.push(app_contract);
                }
            }
        } else if req.as_operator {
            app_contracts.append(
                &mut db::ActiveAppWithNode::list_by_operator(&self.db, &req.admin_pubkey).await?,
            );
        } else {
            app_contracts.append(
                &mut db::ActiveAppWithNode::list_by_admin(&self.db, &req.admin_pubkey).await?,
            );
        }

        let (tx, rx) = mpsc::channel(6);
        tokio::spawn(async move {
            for app_contract in app_contracts {
                let _ = tx.send(Ok(app_contract.into())).await;
            }
        });

        let resp_stream = ReceiverStream::new(rx);
        Ok(Response::new(Box::pin(resp_stream)))
    }

    async fn list_app_nodes(
        &self,
        req: Request<AppNodeFilters>,
    ) -> Result<Response<<Self as BrainAppCli>::ListAppNodesStream>, Status> {
        let req = check_sig_from_req(req)?;
        info!("list_app_nodes process starting for {:?}", req);
        let app_nodes = db::AppNodeWithReports::find_by_filters(&self.db, req, false).await?;
        let (tx, rx) = mpsc::channel(6);
        tokio::spawn(async move {
            for app_node in app_nodes {
                let _ = tx.send(Ok(app_node.into())).await;
            }
        });
        let resp_stream = ReceiverStream::new(rx);
        Ok(Response::new(Box::pin(resp_stream)))
    }

    async fn get_one_app_node(
        &self,
        req: Request<AppNodeFilters>,
    ) -> Result<Response<AppNodeListResp>, Status> {
        let req = check_sig_from_req(req)?;
        info!("get_one_app_node process starting for {:?}", req);
        let app_node = db::AppNodeWithReports::find_by_filters(&self.db, req, true)
            .await?
            .first()
            .ok_or(Status::not_found("No app node found"))?
            .clone();

        Ok(Response::new(app_node.into()))
    }
}