/**
 * @license
 * Copyright (C) 2016 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
(function() {
  'use strict';

  /**
   * gr-account-entry is an element for entering account
   * and/or group with autocomplete support.
   *
   * @extends Polymer.Element
   */
  class GrAccountEntry extends Polymer.GestureEventListeners(
      Polymer.LegacyElementMixin(
          Polymer.Element)) {
    static get is() { return 'gr-account-entry'; }
    /**
     * Fired when an account is entered.
     *
     * @event add
     */

    /**
     * When allowAnyInput is true, account-text-changed is fired when input text
     * changed. This is needed so that the reply dialog's save button can be
     * enabled for arbitrary cc's, which don't need a 'commit'.
     *
     * @event account-text-changed
     */

    static get properties() {
      return {
        allowAnyInput: Boolean,
        borderless: Boolean,
        placeholder: String,

        // suggestFrom = 0 to enable default suggestions.
        suggestFrom: {
          type: Number,
          value: 0,
        },

        /** @type {!function(string): !Promise<Array<{name, value}>>} */
        querySuggestions: {
          type: Function,
          notify: true,
          value() {
            return input => Promise.resolve([]);
          },
        },

        _config: Object,
        /** The value of the autocomplete entry. */
        _inputText: {
          type: String,
          observer: '_inputTextChanged',
        },

      };
    }

    get focusStart() {
      return this.$.input.focusStart;
    }

    focus() {
      this.$.input.focus();
    }

    clear() {
      this.$.input.clear();
    }

    setText(text) {
      this.$.input.setText(text);
    }

    getText() {
      return this.$.input.text;
    }

    _handleInputCommit(e) {
      this.fire('add', {value: e.detail.value});
      this.$.input.focus();
    }

    _inputTextChanged(text) {
      if (text.length && this.allowAnyInput) {
        this.dispatchEvent(new CustomEvent(
            'account-text-changed', {bubbles: true, composed: true}));
      }
    }
  }

  customElements.define(GrAccountEntry.is, GrAccountEntry);
})();