/**
 * @copyright  (C) 2018 Open Source Matters, Inc. <https://www.joomla.org>
 * @license    GNU General Public License version 2 or later; see LICENSE.txt
 */
// eslint-disable no-alert
((Joomla, document) => {

  if (!Joomla) {
    throw new Error('core.js was not properly initialised');
  }
  Joomla.finderIndexer = () => {
    let getRequest;
    let totalItems = null;
    let offset = null;
    let progress = null;
    let optimized = false;
    const path = 'index.php?option=com_finder&tmpl=component&format=json';
    const token = `&${document.getElementById('finder-indexer-token').getAttribute('name')}=1`;
    const removeElement = id => {
      const element = document.getElementById(id);
      if (element) {
        return element.parentNode.removeChild(element);
      }
      return null;
    };
    const updateProgress = (header, message) => {
      progress = offset / totalItems * 100;
      const progressBar = document.getElementById('progress-bar');
      const progressHeader = document.getElementById('finder-progress-header');
      const progressMessage = document.getElementById('finder-progress-message');
      if (progressHeader) {
        progressHeader.innerText = header;
      }
      if (progressMessage) {
        progressMessage.innerHTML = Joomla.sanitizeHtml(message);
      }
      if (progressBar) {
        if (progress < 100) {
          progressBar.style.width = `${progress}%`;
          progressBar.setAttribute('aria-valuenow', progress);
        } else {
          progressBar.classList.remove('bar-success');
          progressBar.classList.add('bar-warning');
          progressBar.setAttribute('aria-valuemin', 100);
          progressBar.setAttribute('aria-valuemax', 200);
          progressBar.style.width = `${progress}%`;
          progressBar.setAttribute('aria-valuenow', progress);
        }

        // Auto close the window
        if (message === Joomla.Text._('COM_FINDER_INDEXER_MESSAGE_COMPLETE')) {
          removeElement('progress');
          window.parent.Joomla.Modal.getCurrent().close();
        }
      }
    };
    const handleResponse = (json, resp) => {
      const progressHeader = document.getElementById('finder-progress-header');
      const progressMessage = document.getElementById('finder-progress-message');
      try {
        if (json === null) {
          throw new Error(resp);
        }
        if (json.error) {
          throw new Error(json);
        }
        if (json.start) {
          // eslint-disable-next-line prefer-destructuring
          totalItems = json.totalItems;
          if (document.getElementById('finder-debug-data')) {
            const debuglist = document.getElementById('finder-debug-data');
            Object.entries(json.pluginState).forEach(context => {
              let item = `<dt class="col-sm-3">${context[0]}</dt>`;
              item += `<dd id="finder-${context[0].replace(/\s+/g, '-').toLowerCase()}" class="col-sm-9"></dd>`;
              debuglist.insertAdjacentHTML('beforeend', Joomla.sanitizeHtml(item, {
                dd: ['class', 'id'],
                dt: ['class']
              }));
            });
          }
        }
        offset += json.batchOffset;
        updateProgress(json.header, json.message);
        if (document.getElementById('finder-debug-data')) {
          Object.entries(json.pluginState).forEach(context => {
            document.getElementById(`finder-${context[0].replace(/\s+/g, '-').toLowerCase()}`).innerHTML = Joomla.sanitizeHtml(`${json.pluginState[context[0]].offset} of ${json.pluginState[context[0]].total}`);
          });
        }
        if (offset < totalItems) {
          getRequest('indexer.batch');
        } else if (!optimized) {
          optimized = true;
          getRequest('indexer.optimize');
        }
      } catch (error) {
        removeElement('progress');
        try {
          if (json.error) {
            if (progressHeader) {
              progressHeader.innerText = json.header;
              progressHeader.classList.add('finder-error');
            }
            if (progressMessage) {
              progressMessage.innerHTML = Joomla.sanitizeHtml(json.message);
              progressMessage.classList.add('finder-error');
            }
          }
        } catch (ignore) {
          if (error === '') {
            // eslint-disable-next-line no-ex-assign
            error = Joomla.Text._('COM_FINDER_NO_ERROR_RETURNED');
          }
          if (progressHeader) {
            progressHeader.innerText = Joomla.Text._('COM_FINDER_AN_ERROR_HAS_OCCURRED');
            progressHeader.classList.add('finder-error');
          }
          if (progressMessage) {
            progressMessage.innerHTML = Joomla.sanitizeHtml(error);
            progressMessage.classList.add('finder-error');
          }
        }
      }
      return true;
    };
    const handleFailure = error => {
      const progressHeader = document.getElementById('finder-progress-header');
      const progressMessage = document.getElementById('finder-progress-message');
      let data;
      if (error instanceof Error) {
        // Encode any html in the message
        const div = document.createElement('div');
        div.textContent = error.message;
        data = div.innerHTML;
        if (error instanceof SyntaxError) {
          data = Joomla.Text._('JLIB_JS_AJAX_ERROR_PARSE').replace('%s', data);
        }
      } else if (typeof error === 'object' && error.responseText) {
        data = error.responseText;
        try {
          data = JSON.parse(data);
        } catch (e) {
          data = Joomla.Text._('JLIB_JS_AJAX_ERROR_OTHER').replace('%s', error.status);
        }
      }
      removeElement('progress');
      const header = data && data.header ? data.header : Joomla.Text._('COM_FINDER_AN_ERROR_HAS_OCCURRED');
      const message = data && data.message ? data.message : `${Joomla.Text._('COM_FINDER_MESSAGE_RETURNED')}<br>${data}`;
      if (progressHeader) {
        progressHeader.innerText = header;
        progressHeader.classList.add('finder-error');
      }
      if (progressMessage) {
        progressMessage.innerHTML = Joomla.sanitizeHtml(message);
        progressMessage.classList.add('finder-error');
      }
    };
    getRequest = task => {
      Joomla.request({
        url: `${path}&task=${task}${token}`,
        promise: true
      }).then(xhr => {
        handleResponse(JSON.parse(xhr.responseText));
      }).catch(error => {
        handleFailure(error);
      });
    };
    const initialize = () => {
      offset = 0;
      progress = 0;
      getRequest('indexer.start');
    };
    initialize();
  };
})(Joomla, document);

// @todo use directly the Joomla.finderIndexer() instead of the Indexer()!!!
document.addEventListener('DOMContentLoaded', () => {
  window.Indexer = Joomla.finderIndexer();
});
