/**
 * Extend the basic ActorSheet with some very simple modifications
 */
export class SimpleActorSheet extends ActorSheet {
  constructor(...args) {
    super(...args);

    /**
     * Keep track of the currently active sheet tab
     * @type {string}
     */
    this._sheetTab = "description";
  }

  /* -------------------------------------------- */

  /**
   * Extend and override the default options used by the 5e Actor Sheet
   * @returns {Object}
   */
	static get defaultOptions() {
	  return mergeObject(super.defaultOptions, {
  	  classes: ["worldbuilding", "sheet", "actor"],
  	  template: "systems/worldbuilding/templates/actor-sheet.html",
      width: 600,
      height: 600
    });
  }

  /* -------------------------------------------- */

  /**
   * Prepare data for rendering the Actor sheet
   * The prepared data object contains both the actor data as well as additional sheet options
   */
  getData() {
    const data = super.getData();
    data.dtypes = ["String", "Number", "Boolean"];
    for ( let attr of Object.values(data.data.attributes) ) {
      attr.isCheckbox = attr.dtype === "Boolean";
    }
    return data;
  }

  /* -------------------------------------------- */

  /**
   * Activate event listeners using the prepared sheet HTML
   * @param html {HTML}   The prepared HTML object ready to be rendered into the DOM
   */
	activateListeners(html) {
    super.activateListeners(html);

    // Activate tabs
    let tabs = html.find('.tabs');
    let initial = this._sheetTab;
    new Tabs(tabs, {
      initial: initial,
      callback: clicked => this._sheetTab = clicked.data("tab")
    });

    // Everything below here is only needed if the sheet is editable
    if (!this.options.editable) return;

    // Update Inventory Item
    html.find('.item-edit').click(ev => {
      const li = $(ev.currentTarget).parents(".item");
      const item = this.actor.getOwnedItem(li.data("itemId"));
      item.sheet.render(true);
    });

    // Delete Inventory Item
    html.find('.item-delete').click(ev => {
      const li = $(ev.currentTarget).parents(".item");
      this.actor.deleteOwnedItem(li.data("itemId"));
      li.slideUp(200, () => this.render(false));
    });

    // Add or Remove Attribute
    html.find(".attributes").on("click", ".attribute-control", this._onClickAttributeControl.bind(this));
  }

  /* -------------------------------------------- */

  async _onClickAttributeControl(event) {
    event.preventDefault();
    const a = event.currentTarget;
    const action = a.dataset.action;
    const attrs = this.object.data.data.attributes;
    const form = this.form;

    // Add new attribute
    if ( action === "create" ) {
      const nk = Object.keys(attrs).length + 1;
      let newKey = document.createElement("div");
      newKey.innerHTML = `<input type="text" name="data.attributes.attr${nk}.key" value="attr${nk}"/>`;
      newKey = newKey.children[0];
      form.appendChild(newKey);
      await this._onSubmit(event);
    }

    // Remove existing attribute
    else if ( action === "delete" ) {
      const li = a.closest(".attribute");
      li.parentElement.removeChild(li);
      await this._onSubmit(event);
    }
  }

  /* -------------------------------------------- */

  /**
   * Implement the _updateObject method as required by the parent class spec
   * This defines how to update the subject of the form when the form is submitted
   * @private
   */
  _updateObject(event, formData) {

    // Handle the free-form attributes list
    const formAttrs = expandObject(formData).data.attributes || {};
    const attributes = Object.fromEntries(Object.entries(formAttrs).map(attr => {
      let [k, v] = attr;
      k = v["key"].trim();
      delete v["key"];
      return [k, v];
    }));
    
    // Remove attributes which are no longer used
    for ( let k of Object.keys(this.object.data.data.attributes) ) {
      if ( !attributes.hasOwnProperty(k) ) attributes[`-=${k}`] = null;
    }

    // Re-combine formData
    formData = Object.fromEntries(Object.entries(formData).filter(a => !a[0].startsWith("data.attributes")));
    formData["_id"] = this.object._id;
    formData["data.attributes"] = attributes;
    
    // Update the Actor
    return this.object.update(formData);
  }
}