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use dbui_core::cfg::AppConfig;
use dbui_core::ctx::RequestContext;
use dbui_core::messages::{RequestMessage, ResponseMessage};
use dbui_core::result::Result;

use actix::{Actor, StreamHandler};
use actix_session::Session;
use actix_web::{web, Error, HttpRequest, HttpResponse};
use actix_web_actors::ws;

/// Define http actor
struct DbuiWebSocket {
  ctx: RequestContext
}

impl Actor for DbuiWebSocket {
  type Context = ws::WebsocketContext<Self>;
}

impl DbuiWebSocket {
  fn ctx(&self) -> &RequestContext {
    &self.ctx
  }

  fn handle_text(&self, s: String, wsc: &mut ws::WebsocketContext<Self>) -> Result<()> {
    let req = RequestMessage::from_json(&s)?;
    self.handle_message(req, wsc)
  }

  fn handle_message(&self, req: RequestMessage, wsc: &mut ws::WebsocketContext<Self>) -> Result<()> {
    match req {
      RequestMessage::Ping { v } => {
        wsc.text(ResponseMessage::Pong { v }.to_json()?);
        Ok(())
      }
      msg => {
        slog::warn!(self.ctx().log(), "Unhandled RequestMessage [{:?}]", msg);
        Ok(())
      }
    }
  }
}

impl StreamHandler<ws::Message, ws::ProtocolError> for DbuiWebSocket {
  fn handle(&mut self, msg: ws::Message, wsc: &mut Self::Context) {
    match msg {
      ws::Message::Ping(msg) => wsc.pong(&msg),
      ws::Message::Text(text) => match &self.handle_text(text, wsc) {
        Ok(_) => (),
        Err(e) => slog::warn!(&self.ctx().log(), "Error sending message via WebSocket: {}", e)
      },
      ws::Message::Binary(bin) => wsc.binary(bin),
      _ => ()
    }
  }
}

pub fn connect(
  session: Session, cfg: web::Data<AppConfig>, req: HttpRequest, stream: web::Payload
) -> std::result::Result<HttpResponse, Error> {
  let ctx = crate::req_context(&session, &cfg, &req, "connect");
  ws::start(DbuiWebSocket { ctx }, &req, stream)
}