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import {empty} from '../../util/sugar.js';

export default {
  extraDependencies: [
    'getSizeOfImageFile',
    'html',
    'language',
    'thumb',
    'to',
  ],

  data(artTags) {
    const data = {};

    if (artTags) {
      data.contentWarnings =
        artTags
          .filter(tag => tag.isContentWarning)
          .map(tag => tag.name);
    } else {
      data.contentWarnings = null;
    }

    return data;
  },

  slots: {
    src: {type: 'string'},

    path: {
      validate: v => v.validateArrayItems(v.isString),
    },

    thumb: {type: 'string'},

    link: {
      validate: v => v.oneOf(v.isBoolean, v.isString),
      default: false,
    },

    reveal: {type: 'boolean', default: true},
    lazy: {type: 'boolean', default: false},
    square: {type: 'boolean', default: false},

    id: {type: 'string'},
    class: {type: 'string'},
    alt: {type: 'string'},
    width: {type: 'number'},
    height: {type: 'number'},

    missingSourceContent: {type: 'html'},
  },

  generate(data, slots, {
    getSizeOfImageFile,
    html,
    language,
    thumb,
    to,
  }) {
    let originalSrc;

    if (slots.src) {
      originalSrc = slots.src;
    } else if (!empty(slots.path)) {
      originalSrc = to(...slots.path);
    } else {
      originalSrc = '';
    }

    const thumbSrc =
      originalSrc &&
        (slots.thumb
          ? thumb[slots.thumb](originalSrc)
          : originalSrc);

    const willLink = typeof slots.link === 'string' || slots.link;
    const customLink = typeof slots.link === 'string';

    const willReveal =
      slots.reveal &&
      originalSrc &&
      !empty(data.contentWarnings);

    const willSquare = slots.square;

    const idOnImg = willLink ? null : slots.id;
    const idOnLink = willLink ? slots.id : null;
    const classOnImg = willLink ? null : slots.class;
    const classOnLink = willLink ? slots.class : null;

    if (!originalSrc) {
      return prepare(
        html.tag('div', {class: 'image-text-area'},
          slots.missingSourceContent));
    }

    let fileSize = null;
    if (willLink) {
      const mediaRoot = to('media.root');
      if (originalSrc.startsWith(mediaRoot)) {
        fileSize =
          getSizeOfImageFile(
            originalSrc
              .slice(mediaRoot.length)
              .replace(/^\//, ''));
      }
    }

    let reveal = null;
    if (willReveal) {
      reveal = [
        language.$('misc.contentWarnings', {
          warnings: language.formatUnitList(data.contentWarnings),
        }),
        html.tag('br'),
        html.tag('span', {class: 'reveal-interaction'},
          language.$('misc.contentWarnings.reveal')),
      ];
    }

    const imgAttributes = {
      id: idOnImg,
      class: classOnImg,
      alt: slots.alt,
      width: slots.width,
      height: slots.height,
      'data-original-size': fileSize,
      'data-no-image-preview': customLink,
    };

    const nonlazyHTML =
      originalSrc &&
        prepare(
          html.tag('img', {
            ...imgAttributes,
            src: thumbSrc,
          }));

    if (slots.lazy) {
      return html.tags([
        html.tag('noscript', nonlazyHTML),
        prepare(
          html.tag('img',
            {
              ...imgAttributes,
              class: 'lazy',
              'data-original': thumbSrc,
            }),
          true),
      ]);
    }

    return nonlazyHTML;

    function prepare(content, hide = false) {
      let wrapped = content;

      wrapped =
        html.tag('div', {class: ['image-container', !originalSrc && 'placeholder-image']},
          html.tag('div', {class: 'image-inner-area'},
            wrapped));

      if (willReveal) {
        wrapped =
          html.tag('div', {class: 'reveal'}, [
            wrapped,
            html.tag('span', {class: 'reveal-text-container'},
              html.tag('span', {class: 'reveal-text'},
                reveal)),
          ]);
      }

      if (willSquare) {
        wrapped =
          html.tag('div',
            {
              class: [
                'square',
                hide && !willLink && 'js-hide'
              ],
            },

            html.tag('div', {class: 'square-content'},
              wrapped));
      }

      if (willLink) {
        wrapped = html.tag('a',
          {
            id: idOnLink,
            class: [
              'box',
              'image-link',
              hide && 'js-hide',
              classOnLink,
            ],

            href:
              (typeof slots.link === 'string'
                ? slots.link
                : originalSrc),
          },
          wrapped);
      }

      return wrapped;
    }
  },
};