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use dbui_core::messages::{RequestMessage, ResponseMessage};
use dbui_core::result::Result;

use std::rc::Rc;
use web_sys::{Document, ErrorEvent, MessageEvent};

#[derive(Clone, Debug)]
pub(crate) struct ClientContext {
  document: Document,
  ws: crate::ws::DbuiSocket
}

impl ClientContext {
  pub(crate) fn new() -> Result<Rc<ClientContext>> {
    let document = web_sys::window().unwrap().document().unwrap();
    let url = &document.location().unwrap().href().unwrap();
    let ws = crate::ws::DbuiSocket::new(&url)?;

    let rc = Rc::new(ClientContext { document, ws });

    let ctx_open = Rc::clone(&rc);
    let on_open = Box::new(move |_j| {
      &ctx_open.on_open();
    });
    let ctx_msg = Rc::clone(&rc);
    let on_message = Box::new(move |m| {
      &ctx_msg.on_message(m);
    });
    let ctx_error = Rc::clone(&rc);
    let on_error = Box::new(move |e| {
      &ctx_error.on_error(e);
    });

    &rc.ws.set_callbacks(on_open, on_message, on_error);
    debug!("[{}] has started", dbui_core::cfg::APPNAME);

    Ok(rc)
  }

  fn send(&self, rm: RequestMessage) {
    self.ws.send(rm);
  }

  fn on_open(&self) {
    info!("on_open");
    self.send(RequestMessage::Ping { v: 0 });
  }

  fn on_message(&self, msg: MessageEvent) {
    let response_str = msg.data().as_string().expect("Can't convert received data to a string");
    let response = ResponseMessage::from_json(&response_str).expect("Can't deserialize ResponseMessage");
    info!("on_message: {:?}", response);
  }

  fn on_error(&self, e: ErrorEvent) {
    warn!("on_error: {:?}", e);
  }
}