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use crate::ctx::RequestContext;
use crate::messages::req::RequestMessage;
use crate::messages::rsp::ResponseMessage;
use crate::{Project, Result};

#[derive(Debug)]
pub struct MessageHandler {
  project: Project,
  request: RequestContext,
  log: slog::Logger
}

impl MessageHandler {
  pub fn new(project: Project, request: RequestContext) -> MessageHandler {
    let log = request.log().new(slog::o!("service" => "message_handler"));
    MessageHandler { project, request, log }
  }

  pub fn on_open(&self) -> Vec<ResponseMessage> {
    vec![ResponseMessage::Connected {
      p: self.project.to_description(),
      u: (*self.request.user()).clone()
    }]
  }

  pub fn on_closed(&self) -> Vec<ResponseMessage> {
    Vec::new()
  }

  pub fn on_message(&self, msg: RequestMessage) -> Result<Vec<ResponseMessage>> {
    let mut ret = Vec::new();
    match msg {
      RequestMessage::Ping { v } => {
        ret.push(ResponseMessage::Pong { v });
      }
      msg => {
        slog::warn!(self.log, "Unhandled RequestMessage [{:?}]", msg);
      }
    }
    Ok(ret)
  }

  pub fn on_error(&self) {}

  pub fn log(&self) -> &slog::Logger {
    &self.log
  }
}