/**
 * @module modules/query-values-sk
 * @description <h2><code>query-values-sk</code></h2>
 *
 * The right-hand side of the query-sk element, the values for a single key
 * in a query/paramset.
 *
 * @evt query-values-changed - Triggered only when the selections have actually
 *     changed. The selection is available in e.detail.
 *
 * @attr {boolean} hide_invert - If the option to invert a query should be made available to
 *       the user.
 * @attr {boolean} hide_regex - If the option to include regex in the query should be made
 *       available to the user.
 */
import { define } from 'elements-sk/define';
import { html } from 'lit-html';
import { ElementSk } from '../../../infra-sk/modules/ElementSk';
import { CheckOrRadio } from 'elements-sk/checkbox-sk/checkbox-sk';
import {
  MultiSelectSk,
  MultiSelectSkSelectionChangedEventDetail,
} from 'elements-sk/multi-select-sk/multi-select-sk';

import 'elements-sk/checkbox-sk';
import 'elements-sk/multi-select-sk';

export interface QueryValuesSkQueryValuesChangedEventDetail {
  invert: boolean;
  regex: boolean;
  values: string[];
}

export class QueryValuesSk extends ElementSk {
  private static template = (ele: QueryValuesSk) => html`
    <checkbox-sk
      id="invert"
      @change=${ele._invertChange}
      title="Match items not selected below."
      label="Invert"
      ?hidden=${ele.hide_invert}
    ></checkbox-sk>
    <checkbox-sk
      id="regex"
      @change=${ele._regexChange}
      title="Match items via regular expression."
      label="Regex"
      ?hidden=${ele.hide_regex}
    ></checkbox-sk>
    <input
      type="text"
      id="regexValue"
      class="hidden"
      @input=${ele._regexInputChange}
    />
    <multi-select-sk id="values" @selection-changed=${ele._selectionChange}>
      ${QueryValuesSk.valuesTemplate(ele)}
    </multi-select-sk>
  `;

  private static valuesTemplate = (ele: QueryValuesSk) => {
    return ele._options.map(
      (v) => html`
        <div value=${v} ?selected=${ele._selected.indexOf(v) !== -1}>${v}</div>
      `
    );
  };

  private _options: string[] = [];
  private _selected: string[] = [];

  private _invert: CheckOrRadio | null = null;
  private _regex: CheckOrRadio | null = null;
  private _regexValue: HTMLInputElement | null = null;
  private _values: MultiSelectSk | null = null;

  constructor() {
    super(QueryValuesSk.template);
  }

  connectedCallback() {
    super.connectedCallback();
    this._render();
    this._invert = this.querySelector('#invert');
    this._regex = this.querySelector('#regex');
    this._values = this.querySelector('#values');
    this._regexValue = this.querySelector('#regexValue');
    this._upgradeProperty('options');
    this._upgradeProperty('selected');
    this._upgradeProperty('hide_invert');
    this._upgradeProperty('hide_regex');
  }

  private _invertChange() {
    if (this._regex!.checked) {
      this._regex!.checked = false;
    }
    this._render();
    this._fireEvent();
  }

  private _regexChange() {
    if (this._invert!.checked) {
      this._invert!.checked = false;
    }
    this._render();
    this._fireEvent();
  }

  private _regexInputChange() {
    this._fireEvent();
  }

  private _selectionChange(
    e: CustomEvent<MultiSelectSkSelectionChangedEventDetail>
  ) {
    this._selected = e.detail.selection.map((i) => this._options[i]);
    this._render();
    this._fireEvent();
  }

  private _fireEvent() {
    const prefix = this._invert!.checked ? '!' : '';
    let selected = this._values!.selection.map(
      (i) => prefix + this._options[i]
    );
    if (this._regex!.checked) {
      selected = [`~${this._regexValue!.value}`];
    }
    this.dispatchEvent(
      new CustomEvent<QueryValuesSkQueryValuesChangedEventDetail>(
        'query-values-changed',
        {
          detail: {
            invert: this._invert!.checked,
            regex: this._regex!.checked,
            values: selected,
          },
          bubbles: true,
        }
      )
    );
  }

  /** Mirrors the hide_invert attribute. */
  get hide_invert() {
    return this.hasAttribute('hide_invert');
  }
  set hide_invert(val) {
    if (val) {
      this.setAttribute('hide_invert', '');
    } else {
      this.removeAttribute('hide_invert');
    }
    this._render();
  }

  /** Mirrors the hide_regex attribute. */
  get hide_regex() {
    return this.hasAttribute('hide_regex');
  }
  set hide_regex(val) {
    if (val) {
      this.setAttribute('hide_regex', '');
    } else {
      this.removeAttribute('hide_regex');
    }
    this._render();
  }

  /** The available options. */
  get options() {
    return this._options;
  }
  set options(val) {
    this._options = val;
    this._selected = [];
    this._render();
  }

  /** Current selections. */
  get selected() {
    return this._selected;
  }
  set selected(val) {
    this._selected = val;
    this._invert!.checked = !!(
      this._selected.length >= 1 && this._selected[0][0] === '!'
    );
    this._regex!.checked = !!(
      this._selected.length === 1 && this._selected[0][0] === '~'
    );
    this._cleanSelected();
    if (this._selected!.length && this._regex!.checked) {
      this._regexValue!.value = this._selected[0];
    }
    this._render();
  }

  private _cleanSelected() {
    // Remove prefixes from _selected.
    this._selected = this._selected.map((val) => {
      if ('~!'.includes(val[0])) {
        return val.slice(1);
      } else {
        return val;
      }
    });
  }

  static get observedAttributes() {
    return ['hide_invert', 'hide_regex'];
  }

  attributeChangedCallback() {
    this._render();
  }
}

define('query-values-sk', QueryValuesSk);