import util from "./util"
import { Message, Author } from "./message"
import { AdapterState } from "./adapter"

export class ThreadSummaryElement extends HTMLElement {
  static observedAttributes = [ "data-msg", "data-len", "data-author", "data-created", "data-latest", "data-new" ];
  
  private _len: number = 0;;
  private _msg: Message | null = null;;
  private _author: Author | null = null;
  private _adapter: string = "";
  private _created: number = 0;
  private _latest: number = 0;
  private _new: boolean = false;
  
  constructor() {
    super();
        this.innerHTML = "<div class='thread_summary'><div class='thread_author'></div><div class='thread_text'></div><div class='thread_metadata'></div></div>"
    
    // adapter shouldn't change, just set it here
    this._adapter = this.getAttribute("data-adapter") ?? "";
    this.addEventListener("click", this.viewThread(this), false);
  }
  
  connectedCallback() {

  }
  
  attributeChangedCallback(attr: string, prev: string, next: string) {

    const datastore = AdapterState._instance.data.get(this._adapter);
    if (!datastore) {
      return;
    }
    let metadataChanged = false;
    
    switch (attr) {
      case "data-msg":
        if (next && next != prev) {
          this._msg = datastore.messages.get(next) || null;
          if (this._msg) {
            // TODO: use attachment alttext or fallback text if no msg content
            // TODO: handle boosts, quotes properly
            
            const threadText = this.querySelector(".thread_text");
            if (threadText) {
              threadText.innerHTML = this._msg.content;
            }
            this.setAttribute("data-author", this._msg.author);
          }
        }
        break;
      case "data-author":
        if (next) {
          let authorData= datastore.profileCache.get(next);
          if (!authorData) {
            util.authorizedFetch(
              "GET", 
              `/api/adapters/${this._adapter}/fetch?entity_type=author&entity_id=${next}`, 
              null);
            this._author = <Author>{id: next};
            const threadAuthor = this.querySelector(".thread_author");
            if (threadAuthor) {
              threadAuthor.innerHTML = `<a id="thread_${this._adapter}_${(this._msg ? this._msg.id : 0)}_${this._author.id}" href="#author?id=${this._author.id}">${this._author.id}</a>`;
            }
          } else {
            this._author = authorData;
            const threadAuthor = this.querySelector(".thread_author");
            if (threadAuthor) {
              threadAuthor.innerHTML = `<img src="${this._author.profilePic}" alt="${this._author.id}"/> <a id="thread_${this._adapter}_${(this._msg ? this._msg.id : 0)}_${this._author.id}" href="#author?id=${this._author.id}">${this._author.id}</a>`
            }
          }
        } 
        break;
      case "data-len":
        this._len = parseInt(next);
        metadataChanged = true;
        break;
      case "data-latest":
        this._latest = parseInt(next);
        metadataChanged = true;
        break;
      case "data-new":
        this._new = next ? true : false;
        metadataChanged = true;
        break;
    }
    
    if (metadataChanged) {
      const threadMeta = this.querySelector(".thread_metadata");
      if (threadMeta) {
        threadMeta.innerHTML = `<span>${this._new ? "!" : ""}[${this._len}] created: ${new Date(this._created)}, updated: ${new Date(this._latest)}</span>`;
      }
    }
  }
  
  viewThread(self: ThreadSummaryElement) {
    return () => {
      const a = util.$(`adapter_${self._adapter}`);
      if (a && self._msg) {
        a.setAttribute("data-view", "thread");
        a.setAttribute("data-viewing", self._msg.id);
      }
    }
  }
}