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use dbui_core::messages::RequestMessage;
use dbui_core::result::Result;

use wasm_bindgen::prelude::*;
use wasm_bindgen::JsCast;
use web_sys::{ErrorEvent, MessageEvent, WebSocket};

#[derive(Clone, Debug)]
pub(crate) struct DbuiSocket {
  url: String,
  ws: WebSocket
}

impl DbuiSocket {
  pub(crate) fn new(curr_url: &str) -> Result<DbuiSocket> {
    let url = calc_url(curr_url);
    let ws = WebSocket::new(&url).expect("Can't create WebSocket");
    Ok(DbuiSocket { url, ws })
  }

  pub(crate) fn set_callbacks(
    &self, on_open: Box<dyn FnMut(JsValue)>, on_message: Box<dyn FnMut(MessageEvent)>, on_error: Box<dyn FnMut(ErrorEvent)>
  ) {
    let onmessage_callback = Closure::wrap(on_message);
    self.ws.set_onmessage(Some(onmessage_callback.as_ref().unchecked_ref()));
    onmessage_callback.forget();

    let onerror_callback = Closure::wrap(on_error);
    self.ws.set_onerror(Some(onerror_callback.as_ref().unchecked_ref()));
    onerror_callback.forget();

    let onopen_callback = Closure::wrap(on_open);
    self.ws.set_onopen(Some(onopen_callback.as_ref().unchecked_ref()));
    onopen_callback.forget();
  }

  pub(crate) fn send(&self, msg: RequestMessage) {
    match &self.ws.send_with_str(&msg.to_json().expect("Can't serialize RequestMessage")) {
      Ok(_) => debug!("Message sent"),
      Err(err) => error!("Error sending message: [{:?}]", err)
    }
  }
}

fn calc_url(src: &str) -> String {
  let cleaned = src
    .trim_start_matches("http")
    .trim_start_matches("file")
    .trim_start_matches("ws")
    .trim_start_matches("s")
    .trim_start_matches("://");
  let split: Vec<&str> = cleaned.splitn(2, '/').collect();
  format!("ws://{}/connect", split[0])
}