import { CartBaseController } from "./cart_base_controller";

/*
 * Populates a state field where users can type to filter and select
 * from a predefined list.  It waits for an `cart:country:update` event
 * to become populated.
 */
export default class extends CartBaseController {
  // All are required!
  static targets = ["id", "list", "name"];

  connect() {
    this.cart_country_update_event = this._cart_country_update_event.bind(this);
    this.change_event = this._change_event.bind(this);

    window.addEventListener(
      "cart:country:update",
      this.cart_country_update_event
    );

    // When the input changes we update the actual value and also the
    // state list via an Event
    this.nameTarget.addEventListener("change", this.change_event);
  }

  disconnect() {
    window.removeEventListener(
      "cart:country:update",
      this.cart_country_update_event
    );
    this.nameTarget.removeEventListener("change", this.change_event);
  }

  async _cart_country_update_event(event) {
    if (this.data.get("group") !== event.detail.group) return;

    this.idTarget.value = "";
    this.nameTarget.value = "";
    this.listTarget.innerHTML = "";

    const statesRequired = event.detail.data.statesRequired == "true";

    this.nameTarget.disabled = !statesRequired;
    this.nameTarget.required = statesRequired;

    if (!statesRequired) return;

    const states = await this.states(event.detail.iso);
    const site = window.site;

    states.forEach((state) => {
      let option = document.createElement("option");
      option.value = state.attributes.name;
      option.dataset.id = state.id;

      this.listTarget.appendChild(option);
    });

    this.nameTarget.pattern = states.map((x) => x.attributes.name).join("|");
    this.nameTarget.addEventListener("input", (event) =>
      this.nameTarget.setCustomValidity("")
    );
    this.nameTarget.addEventListener("invalid", (event) =>
      this.nameTarget.setCustomValidity(site.i18n.states.validation)
    );

    if (event.detail.selectedState) {
      this.nameTarget.value = event.detail.selectedState;
      this.nameTarget.dispatchEvent(new Event("change"));
    }
  }

  _change_event(event) {
    const options = Array.from(this.listTarget.options);
    const option = options.find((x) => x.value == this.nameTarget.value);

    // TODO: If no option is found, mark the field as invalid
    if (!option) return;

    this.idTarget.value = option.dataset.id;
    this.idTarget.dispatchEvent(new Event("change"));
  }

  /*
   * Fetch the state list from storage or from API using a country ISO
   * code
   */
  async states(countryIso) {
    const stateId = `states:${countryIso}`;
    let states = JSON.parse(this.storageTemp.getItem(stateId));

    if (states) return states;

    // There's no state query, but we can fetch the country and include
    // its states.
    const response = await this.spree.countries.show(countryIso, {
      include: "states",
    });

    // TODO: Show error message
    if (response.isFail()) {
      this.handleFailure(response);
      return {};
    }

    states = response.success().included;

    // Order alphabetically by name
    states.sort((x, y) => x.attributes.name > y.attributes.name);

    this.storageTemp.setItem(stateId, JSON.stringify(states));

    return states;
  }
}