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use dbui_core::{RequestMessage, ResponseMessage, Result};
use dbui_service::handler::MessageHandler;
use dbui_service::AppConfig;

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

struct DbuiWebSocket {
  handler: MessageHandler
}

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

  fn started(&mut self, wsc: &mut Self::Context) {
    for msg in self.handler.on_open() {
      match self.send(msg, wsc) {
        Ok(_) => (),
        Err(e) => slog::warn!(self.handler.log(), "Unable to send initial open messages: {:?}", e)
      }
    }
  }
}

impl DbuiWebSocket {
  fn handler(&self) -> &MessageHandler {
    &self.handler
  }

  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<()> {
    for msg in self.handler.on_message(req)? {
      self.send(msg, wsc)?;
    }
    Ok(())
  }

  fn send(&self, rsp: ResponseMessage, wsc: &mut ws::WebsocketContext<Self>) -> Result<()> {
    wsc.text(rsp.to_json()?);
    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.handler().log(), "Error handling message: {:?}", e);
          let msg = ResponseMessage::ServerError {
            reason: format!("{}", e),
            content: "Error handling message".into()
          };
          match self.send(msg, wsc) {
            Ok(_) => (),
            Err(e) => slog::warn!(&self.handler().log(), "Error sending server error message: {:?}", e)
          }
        }
      },
      ws::Message::Binary(bin) => wsc.binary(bin),
      _ => ()
    }
  }
}

pub fn connect(
  session: Session, cfg: web::Data<AppConfig>, project: web::Path<String>, req: HttpRequest, stream: web::Payload
) -> std::result::Result<HttpResponse, Error> {
  let ctx = crate::req_context(&session, &cfg, &req, "connect");
  let projects = ctx.app().projects();
  let p = projects.read().expect("Can't lock project service!").get_project(&project);
  match p {
    Ok(p) => {
      let handler = MessageHandler::new(p, ctx);
      let socket = DbuiWebSocket { handler };
      ws::start(socket, &req, stream)
    }
    Err(e) => {
      slog::warn!(ctx.log(), "Unable to load project [{}]: {:?}", project, e);
      panic!("Cant load Project")
    }
  }
}