import Callbacks from "../classes/Callbacks";
import DataBoard from "../classes/DataBoard";
import Thread from "../classes/Thread";
import Index from "../General/Index";
import UI from "../General/UI";
import { g, Conf, d, doc } from "../globals/globals";
import Main from "../main/Main";
import Menu from "../Menu/Menu";
import $ from "../platform/$";
import $$ from "../platform/$$";
import { dict } from "../platform/helpers";

/*
 * decaffeinate suggestions:
 * DS102: Remove unnecessary code created because of implicit returns
 * Full docs: https://github.com/decaffeinate/decaffeinate/blob/main/docs/suggestions.md
 */
var ThreadHiding = {
  init() {
    if (!['index', 'catalog'].includes(g.VIEW) || (!Conf['Thread Hiding Buttons'] && !(Conf['Menu'] && Conf['Thread Hiding Link']) && !Conf['JSON Index'])) { return; }
    this.db = new DataBoard('hiddenThreads');
    if (g.VIEW === 'catalog') { return this.catalogWatch(); }
    this.catalogSet(g.BOARD);
    $.on(d, 'IndexRefreshInternal', this.onIndexRefresh);
    if (Conf['Thread Hiding Buttons']) {
      $.addClass(doc, 'thread-hide');
    }
    return Callbacks.Post.push({
      name: 'Thread Hiding',
      cb:   this.node
    });
  },

  catalogSet(board) {
    if (!$.hasStorage || (g.SITE.software !== 'yotsuba')) { return; }
    const hiddenThreads = ThreadHiding.db.get({
      boardID: board.ID,
      defaultValue: dict()
    });
    for (var threadID in hiddenThreads) { hiddenThreads[threadID] = true; }
    return localStorage.setItem(`4chan-hide-t-${board}`, JSON.stringify(hiddenThreads));
  },

  catalogWatch() {
    if (!$.hasStorage || (g.SITE.software !== 'yotsuba')) { return; }
    this.hiddenThreads = JSON.parse(localStorage.getItem(`4chan-hide-t-${g.BOARD}`)) || {};
    return Main.ready(() => // 4chan's catalog sets the style to "display: none;" when hiding or unhiding a thread.
    new MutationObserver(ThreadHiding.catalogSave).observe($.id('threads'), {
      attributes: true,
      subtree: true,
      attributeFilter: ['style']
    }));
  },

  catalogSave() {
    let threadID;
    const hiddenThreads2 = JSON.parse(localStorage.getItem(`4chan-hide-t-${g.BOARD}`)) || {};
    for (threadID in hiddenThreads2) {
      if (!$.hasOwn(ThreadHiding.hiddenThreads, threadID)) {
        ThreadHiding.db.set({
          boardID:  g.BOARD.ID,
          threadID,
          val:      {makeStub: Conf['Stubs']}});
      }
    }
    for (threadID in ThreadHiding.hiddenThreads) {
      if (!$.hasOwn(hiddenThreads2, threadID)) {
        ThreadHiding.db.delete({
          boardID:  g.BOARD.ID,
          threadID
        });
      }
    }
    return ThreadHiding.hiddenThreads = hiddenThreads2;
  },

  isHidden(boardID, threadID) {
    return !!(ThreadHiding.db && ThreadHiding.db.get({boardID, threadID}));
  },

  node() {
    let data;
    if (this.isReply || this.isClone || this.isFetchedQuote) { return; }

    if (Conf['Thread Hiding Buttons']) {
      $.prepend(this.nodes.root, ThreadHiding.makeButton(this.thread, 'hide'));
    }

    if (data = ThreadHiding.db.get({boardID: this.board.ID, threadID: this.ID})) {
      return ThreadHiding.hide(this.thread, data.makeStub);
    }
  },

  onIndexRefresh() {
    return g.BOARD.threads.forEach(function(thread) {
      const {root} = thread.nodes;
      if (thread.isHidden && thread.stub && !root.contains(thread.stub)) {
        return ThreadHiding.makeStub(thread, root);
      }
    });
  },

  menu: {
    init() {
      if ((g.VIEW !== 'index') || !Conf['Menu'] || !Conf['Thread Hiding Link']) { return; }

      let div = $.el('div', {
        className: 'hide-thread-link',
        textContent: 'Hide'
      }
      );

      const apply = $.el('a', {
        textContent: 'Apply',
        href: 'javascript:;'
      }
      );
      $.on(apply, 'click', ThreadHiding.menu.hide);

      const makeStub = UI.checkbox('Stubs', 'Make stub');

      Menu.menu.addEntry({
        el: div,
        order: 20,
        open({thread, isReply}) {
          if (isReply || thread.isHidden || (Conf['JSON Index'] && (Conf['Index Mode'] === 'catalog'))) {
            return false;
          }
          ThreadHiding.menu.thread = thread;
          return true;
        },
        subEntries: [{el: apply}, {el: makeStub}]});

      div = $.el('a', {
        className: 'show-thread-link',
        textContent: 'Show',
        href: 'javascript:;'
      }
      );
      $.on(div, 'click', ThreadHiding.menu.show);

      Menu.menu.addEntry({
        el: div,
        order: 20,
        open({thread, isReply}) {
          if (isReply || !thread.isHidden || (Conf['JSON Index'] && (Conf['Index Mode'] === 'catalog'))) {
            return false;
          }
          ThreadHiding.menu.thread = thread;
          return true;
        }
      });

      const hideStubLink = $.el('a', {
        textContent: 'Hide stub',
        href: 'javascript:;'
      }
      );
      $.on(hideStubLink, 'click', ThreadHiding.menu.hideStub);

      return Menu.menu.addEntry({
        el: hideStubLink,
        order: 15,
        open({thread, isReply}) {
          if (isReply || !thread.isHidden || (Conf['JSON Index'] && (Conf['Index Mode'] === 'catalog'))) {
            return false;
          }
          return ThreadHiding.menu.thread = thread;
        }
      });
    },

    hide() {
      const makeStub = $('input', this.parentNode).checked;
      const {thread} = ThreadHiding.menu;
      ThreadHiding.hide(thread, makeStub);
      ThreadHiding.saveHiddenState(thread, makeStub);
      return $.event('CloseMenu');
    },

    show() {
      const {thread} = ThreadHiding.menu;
      ThreadHiding.show(thread);
      ThreadHiding.saveHiddenState(thread);
      return $.event('CloseMenu');
    },

    hideStub() {
      const {thread} = ThreadHiding.menu;
      ThreadHiding.show(thread);
      ThreadHiding.hide(thread, false);
      ThreadHiding.saveHiddenState(thread, false);
      $.event('CloseMenu');
    }
  },

  makeButton(thread, type) {
    const a = $.el('a', {
      className: `${type}-thread-button`,
      href:      'javascript:;'
    }
    );
    $.extend(a, {textContent: type === "hide" ? '➖︎' : '➕︎' });
    a.dataset.fullID = thread.fullID;
    $.on(a, 'click', ThreadHiding.toggle);
    return a;
  },

  makeStub(thread, root) {
    let summary, threadDivider;
    let numReplies  = $$(g.SITE.selectors.replyOriginal, root).length;
    if (summary = $(g.SITE.selectors.summary, root)) { numReplies += +summary.textContent.match(/\d+/); }

    const a = ThreadHiding.makeButton(thread, 'show');
    $.add(a, $.tn(` ${thread.OP.info.nameBlock} (${numReplies === 1 ? '1 reply' : `${numReplies} replies`})`));
    thread.stub = $.el('div',
      {className: 'stub'});
    if (Conf['Menu']) {
      $.add(thread.stub, [a, Menu.makeButton(thread.OP)]);
    } else {
      $.add(thread.stub, a);
    }
    $.prepend(root, thread.stub);

    // Prevent hiding of thread divider on sites that put it inside the thread
    if (threadDivider = $(g.SITE.selectors.threadDivider, root)) {
      return $.addClass(threadDivider, 'threadDivider');
    }
  },

  saveHiddenState(thread, makeStub) {
    if (thread.isHidden) {
      ThreadHiding.db.set({
        boardID:  thread.board.ID,
        threadID: thread.ID,
        val: {makeStub}});
    } else {
      ThreadHiding.db.delete({
        boardID:  thread.board.ID,
        threadID: thread.ID
      });
    }
    return ThreadHiding.catalogSet(thread.board);
  },

  toggle(thread) {
    if (!(thread instanceof Thread)) {
      thread = g.threads.get(this.dataset.fullID);
    }
    if (thread.isHidden) {
      ThreadHiding.show(thread);
    } else {
      ThreadHiding.hide(thread);
    }
    return ThreadHiding.saveHiddenState(thread);
  },

  hide(thread, makeStub=Conf['Stubs']) {
    if (thread.isHidden) { return; }
    const threadRoot = thread.nodes.root;
    thread.isHidden = true;
    Index.updateHideLabel();
    if (thread.catalogView && !Index.showHiddenThreads) {
      $.rm(thread.catalogView.nodes.root);
      $.event('PostsRemoved', null, Index.root);
    }

    if (!makeStub) { return threadRoot.hidden = true; }

    return ThreadHiding.makeStub(thread, threadRoot);
  },

  show(thread) {
    if (thread.stub) {
      $.rm(thread.stub);
      delete thread.stub;
    }
    const threadRoot = thread.nodes.root;
    threadRoot.hidden = (thread.isHidden = false);
    Index.updateHideLabel();
    if (thread.catalogView && Index.showHiddenThreads) {
      $.rm(thread.catalogView.nodes.root);
      return $.event('PostsRemoved', null, Index.root);
    }
  }
};
export default ThreadHiding;