// If you want to use Phoenix channels, run `mix help phx.gen.channel`
// to get started and then uncomment the line below.
// import "./user_socket.js"

// You can include dependencies in two ways.
//
// The simplest option is to put them in assets/vendor and
// import them using relative paths:
//
//     import "../vendor/some-package.js"
//
// Alternatively, you can `npm install some-package --prefix assets` and import
// them using a path starting with the package name:
//
//     import "some-package"
//

import "phoenix_html";
import { Socket } from "phoenix";
import { LiveSocket } from "phoenix_live_view";
import topbar from "../vendor/topbar";

let Hooks = {};

// Renders a complete markdown string client-side on mount.
// The raw markdown is passed as the data-md attribute.
Hooks.MarkdownRender = {
  mounted() {
    const smd = window.smd;
    const content = this.el.dataset.md;
    if (!content) return;
    const parser = smd.parser(smd.default_renderer(this.el));
    smd.parser_write(parser, content);
    smd.parser_end(parser);
  },
};

// Streams markdown chunks into the element using the streaming-markdown parser.
// The server sends push_event(socket, eventName, %{chunk: "..."}) for each chunk.
// data-event on the element controls which event this hook listens for.
// The server sends push_event(socket, eventName, %{chunk: "..."}) for each chunk.
// data-event on the element controls which event this hook listens for.
Hooks.MarkdownStream = {
  mounted() {
    const smd = window.smd;
    const DOMPurify = window.DOMPurify;
    this._chunks = "";
    this._parser = smd.parser(smd.default_renderer(this.el));
    const eventName = this.el.dataset.event;
    this.handleEvent(eventName, ({ chunk }) => {
      this._chunks += chunk;
      // Sanitize all accumulated chunks to detect injection attacks.
      DOMPurify.sanitize(this._chunks);
      if (DOMPurify.removed.length > 0) {
        // Insecure content detected — stop rendering immediately.
        smd.parser_end(this._parser);
        this._parser = null;
        return;
      }
      if (this._parser) smd.parser_write(this._parser, chunk);
    });
  },
  destroyed() {
    if (this._parser) {
      window.smd.parser_end(this._parser);
      this._parser = null;
    }
  },
};

Hooks.ScrollBottom = {
  mounted() {
    requestAnimationFrame(() => this.scrollToBottom());
    this.observer = new MutationObserver(() => {
      if (this.isNearBottom()) this.scrollToBottom();
    });
    this.observer.observe(this.el, { childList: true, subtree: true });
    this.handleEvent("scroll_to_bottom", () => {
      requestAnimationFrame(() => this.scrollToBottom());
    });
  },
  updated() {
    if (this.isNearBottom()) this.scrollToBottom();
  },
  destroyed() {
    this.observer.disconnect();
  },
  isNearBottom() {
    const closeToBottomThreshold = 200;
    return (
      this.el.scrollHeight - this.el.scrollTop - this.el.clientHeight <=
      closeToBottomThreshold
    );
  },
  scrollToBottom() {
    this.el.scrollTop = this.el.scrollHeight;
  },
};

let csrfToken = document
  .querySelector("meta[name='csrf-token']")
  .getAttribute("content");

const reconnectAfterMs = (tries) => [100, 250, 500][tries - 1] || 1000;
const rejoinAfterMs = (tries) => [100, 250, 500][tries - 1] || 1000;

let liveSocket = new LiveSocket("/live", Socket, {
  params: { _csrf_token: csrfToken },
  hooks: Hooks,
  reconnectAfterMs,
  rejoinAfterMs,
});

topbar.config({ barColors: { 0: "#29d" }, shadowColor: "rgba(0, 0, 0, .3)" });
window.addEventListener("phx:page-loading-start", (_info) => topbar.show(300));
window.addEventListener("phx:page-loading-stop", (_info) => topbar.hide());

liveSocket.connect();
window.liveSocket = liveSocket;