text: import $ from 'jquery';
  
  import ajax from '../../util/ajax';
  import keycode from '../../util/keycode';
  import notify from '../notify';
  import translate from '../../util/translate';
  
  const updatePath = ($input, isClear) => {
    const $file = $input.closest('.file');
    const $path = $file.find('.file__path');
    const $clearButton = $file.find('.button--clear');
    const { files } = $input[0];
    const { length } = files;
    let path = '';
  
    if (isClear) {
      $input.trigger('change');
    }
  
    if (length) {
      Array.from(files).forEach(({ name }, index) => {
        path += index === length - 1 ? name : `${name}, `;
      });
  
      $file.attr('title', path);
      $clearButton.removeClass('button--is-hidden');
      $path.addClass('file__path--has-value');
    } else {
      $clearButton.addClass('button--is-hidden');
      $path.removeClass('file__path--has-value');
    }
  
    if (!path) {
      path = $input.data('placeholder') || translate('placeholder.upload_file');
      $file.removeAttr('title');
    }
  
    $path.text(path);
  };
  
  const generateMarkup = ($input, isDragAndDrop) => {
    const $parent = $input.parent();
    const $error = $parent.find('.form__error');
    const $file = $('<div class="file" />');
    let $path;
  
    if (isDragAndDrop) {
      $path = $('<button type="button" class="button file__button" />');
  
      $file.addClass('file--is-drag-and-drop');
    } else {
      $path = $('<div class="file__path" />');
  
      $file
        .addClass('button form__input')
        .attr('tabindex', 0);
    }
  
    if ($input.prop('multiple')) {
      $file.addClass('file--is-multiple');
    }
  
    if ($input.prop('disabled')) {
      $file
        .addClass('file--is-disabled')
        .attr('tabindex', -1);
    }
  
    if ($error.length) {
      $file.insertBefore($error.eq(0));
    } else {
      $parent.append($file);
    }
  
    $file
      .append($parent.find('.form__label'))
      .append($input)
      .append($path);
  
    if (!isDragAndDrop) {
      $file.append($(`<button
        type="button"
        class="button button--close button--clear button--is-hidden"
        title="${translate('remove')}"
        aria-label="${translate('remove')}"
      />`));
    } else {
      $file
        .append($('<div class="progress"><span><span></span></span></div>'))
        .append($('<ul class="file__list" />'));
    }
  
    $path.text($input.val() || $input.data('placeholder') || translate('placeholder.upload_file'));
  };
  
  const attachDefaultHandlers = ($input) => {
    const $file = $input.closest('.file');
  
    $file.on('click keydown', (event) => {
      if (event.target !== event.currentTarget
        || (event.type === 'keydown' && event.key !== keycode.enter)) {
        return;
      }
  
      if ($(event.target).hasClass('button--clear')
        || $file.hasClass('file--is-disabled')) {
        return;
      }
  
      $input.trigger('click');
    });
  
    $input.on('change', () => updatePath($input));
  
    $file.find('.button--clear').on('click', () => {
      $input.val(null);
      updatePath($input, true);
    });
  };
  
  const preventDefaults = (event) => {
    event.preventDefault();
    event.stopPropagation();
  };
  
  const attachDragAndDropHandlers = ($input) => {
    const $file = $input.closest('.file');
    const $progressBar = $file.find('.progress');
    const $body = $('body');
  
    const highlight = () => {
      $file.addClass('file--is-highlighted');
    };
  
    const unhighlight = () => {
      $file.removeClass('file--is-highlighted');
    };
  
    let uploadProgress = [];
  
    const initializeProgress = (fileCount) => {
      uploadProgress = [];
  
      for (let i = fileCount; i > 0; i -= 1) {
        uploadProgress.push(0);
      }
    };
  
    const appendFile = (file, filename) => {
      const { name } = file;
      const reader = new FileReader();
      const $fileList = $file.find('.file__list');
      let extension = name.split('.').pop();
  
      reader.readAsDataURL(file);
  
      if (extension.length > 4) {
        extension = 'file';
      }
  
      reader.onloadend = () => {
        $fileList.append($(`<li class="file__list-item">
            <i class="file-icon" data-extension="${extension}"></i>
            <div class="file__list-name">${name}</div>
            <button
              type="button"
              class="button button--close button--clear"
              title="${translate('remove')}"
              aria-label="${translate('remove')}"
            ></button>
              ${reader.result.indexOf('data:image/') === 0 ? `
                <img src="${reader.result}" class="file__image responsive-image" alt="${file.name}">
              `.trim() : ''}
          </li>`));
  
        const $lastListItem = $file.find('.file__list-item').last();
  
        $lastListItem
          .find('.button--clear')
          .on('click', () => {
            $input.val(null);
  
            ajax({
              url: $input.data('path') || '/',
              method: 'DELETE',
              data: {
                filename,
              },
              done: (response) => {
                if (!response.success) {
                  notify();
  
                  return;
                }
  
                $lastListItem.slideUp('fast', () => {
                  $lastListItem.remove();
                });
              },
            });
          });
      };
    };
  
    const updateProgress = (fileCount, percent) => {
      uploadProgress[fileCount] = percent;
  
      const total = uploadProgress.reduce((progress, current) => progress + current, 0);
      const percentageFilled = total / uploadProgress.length;
  
      $progressBar
        .find('span')
        .first()
        .width(`${percentageFilled}%`);
  
      if (percentageFilled >= 100) {
        $progressBar.removeClass('progress--is-visible');
      }
    };
  
    const uploadFile = (file, index) => {
      const maxSize = $input.data('max-size') || Infinity;
      const types = $input.data('mime-types');
      const allowedTypes = types.split(', ');
  
      if (file.size > maxSize * 1048576) {
        notify({
          text: translate('error.form.max_size.exceeded', { limit: maxSize }),
        });
  
        return;
      }
  
      if (!allowedTypes.includes(file.type)) {
        notify({
          text: translate('error.form.mime_type.invalid', { types }),
        });
  
        return;
      }
  
      let alreadyAdded = false;
  
      $file.find('.file__list-name').each((i, name) => {
        if (!alreadyAdded && $(name).text() === file.name) {
          alreadyAdded = true;
        }
      });
  
      if (alreadyAdded) {
        notify({
          text: translate('error.form.file.already_added'),
        });
  
        return;
      }
  
      const formData = new FormData();
  
      formData.append('file', file);
      $progressBar.addClass('progress--is-visible');
  
      ajax({
        url: $input.data('path') || '/',
        data: formData,
        enctype: 'multipart/form-data',
        processData: false,
        contentType: false,
        allowParallelRequests: true,
        $button: $file.find('.file__button'),
        done: (response) => {
          if (!response.success) {
            notify();
  
            return;
          }
  
          $progressBar.removeClass('progress--is-visible');
          appendFile(file, response.filename);
        },
        xhr: () => {
          const xhr = new XMLHttpRequest();
  
          xhr.upload.addEventListener('progress', (event) => {
            updateProgress(index, ((event.loaded * 100.0) / event.total) || 100);
          });
  
          xhr.addEventListener('readystatechange', () => {
            if (xhr.readyState === 4 && xhr.status === 200) {
              updateProgress(index, 100);
            } else if (xhr.readyState === 4 && xhr.status !== 200) {
              notify();
            }
          });
  
          return xhr;
        },
      });
    };
  
    const handleFiles = ([...files]) => {
      unhighlight();
  
      $progressBar
        .removeClass('progress--is-filled')
        .find('span')
        .first()
        .width(0);
  
      if ($input.prop('multiple')) {
        initializeProgress(files.length);
        files.forEach(uploadFile);
      } else {
        initializeProgress(1);
        uploadFile(files[0], 0);
      }
    };
  
    ['dragenter', 'dragover', 'dragleave', 'drop'].forEach((eventName) => {
      $file.on(eventName, preventDefaults);
      $body.on(eventName, preventDefaults);
    });
  
    $file
      .on('dragenter', highlight)
      .on('dragover', highlight)
      .on('dragleave', unhighlight)
      .on('drop', (event) => handleFiles(event.originalEvent.dataTransfer.files));
  
    $file.on('change', () => handleFiles($input[0].files));
  
    $file.find('.file__button').on('click', (event) => {
      if (event.type === 'keydown' && event.key !== keycode.enter) {
        return;
      }
  
      if ($file.hasClass('file--is-disabled')) {
        return;
      }
  
      $input.trigger('click');
    });
  };
  
  export default () => {
    $('.file__input').each((index, input) => {
      const $input = $(input);
      const isDragAndDrop = $input.data('drag-and-drop');
  
      generateMarkup($input, isDragAndDrop);
  
      if (isDragAndDrop) {
        attachDragAndDropHandlers($input);
      } else {
        attachDefaultHandlers($input);
      }
    });
  };
  