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use std::{collections::HashMap, io::Result};

use crate::{
    ids,
    subnet::rpc::{
        context::Context,
        database::manager::Manager,
        health::Checkable,
        snow::engine::common::{
            appsender::AppSender, engine::AppHandler, http_handler::HttpHandler, message::Message,
        },
        snow::State,
    },
};
use tokio::sync::mpsc::Sender;

/// Vm describes the trait that all consensus VMs must implement.
///
/// ref. <https://pkg.go.dev/github.com/ava-labs/avalanchego/snow/engine/common#Vm>
#[tonic::async_trait]
pub trait Vm: AppHandler + Connector + Checkable {
    // type Manager;
    // type AppSender;

    async fn initialize(
        &mut self,
        ctx: Option<Context>,
        db_manager: Box<dyn Manager + Send + Sync>,
        genesis_bytes: &[u8],
        upgrade_bytes: &[u8],
        config_bytes: &[u8],
        to_engine: Sender<Message>,
        fxs: &[Fx],
        app_sender: Box<dyn AppSender + Send + Sync>,
    ) -> Result<()>;
    async fn set_state(&self, state: State) -> Result<()>;
    async fn shutdown(&self) -> Result<()>;
    async fn version(&self) -> Result<String>;
    async fn create_static_handlers(&mut self) -> Result<HashMap<String, HttpHandler>>;
    async fn create_handlers(&mut self) -> Result<HashMap<String, HttpHandler>>;
}

/// snow.validators.Connector
///
/// ref. <https://pkg.go.dev/github.com/ava-labs/avalanchego/snow/validators#Connector>
#[tonic::async_trait]
pub trait Connector {
    async fn connected(&self, id: &ids::node::Id) -> Result<()>;
    async fn disconnected(&self, id: &ids::node::Id) -> Result<()>;
}

/// TODO: Currently not implemented
pub type Fx = ();