/*
 * Copyright (C) 2021  Aravinth Manivannan <realaravinth@batsense.net>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
import {LEVELS} from '../levels/index';
import updateLevelNumbersOnDOM from './updateDom';
import CONST from '../const';

import log from '../../../../../logger';

const REMOVE_LEVEL_BUTTON = 'sitekey-form__level-remove-level-button';

/**
 * Gets executed when 'Remove' Button is clicked to remove levels
 */
const removeLevel = (e: Event) => {
  const eventTarget = <HTMLElement>e.target;
  const PARENT = <HTMLElement>eventTarget.parentElement;
  const FIELDSET = <HTMLElement>PARENT.parentElement;

  const levelNum = parseInt(
    eventTarget.id.slice(CONST.REMOVE_LEVEL_BUTTON_ID_WITHOUT_LEVEL.length),
  );

  if (Number.isNaN(levelNum)) {
    const msg =
      '[removeLevelButton.ts] error in parsing level number from remove button ID';
    //log.error(msg);
    throw new Error(msg);
  }
  updateLevelNumbersOnDOM(levelNum);

  LEVELS.remove(levelNum);
  FIELDSET.remove();
};

/** adds onclick event listener */
export const addRemoveLevelButtonEventListener = (level: number) => {
  const removeButton = document.getElementById(
    `${CONST.REMOVE_LEVEL_BUTTON_ID_WITHOUT_LEVEL}${level}`,
  );

  removeButton.addEventListener('click', removeLevel);
};

/** adds onclick event listener to all remove buttons */
export const addRemoveLevelButtonEventListenerAll = () => {
  const removeButtons = document.querySelectorAll(`.${REMOVE_LEVEL_BUTTON}`);
  removeButtons.forEach(button =>
    button.addEventListener('click', removeLevel),
  );
};

/**
 * Generate Remove button HTML. On-click handler should be added
 * seprately
 */
export const getRemoveButtonHTML = (level: number) => {
  log.log(`[generating HTML getHtml]level: ${level}`);
  const HTML = `
  ${CONST.REMOVE_LEVEL_LABEL_TEXT}
  <input
    class="${CONST.REMOVE_LEVEL_BUTTON_CLASS}"
    type="button"
    name="${CONST.REMOVE_LEVEL_BUTTON_ID_WITHOUT_LEVEL}${level}"
    id="${CONST.REMOVE_LEVEL_BUTTON_ID_WITHOUT_LEVEL}${level}"
    value="x"
  />
</fieldset>
`;
  return HTML;
};