import merge from 'lodash.merge';
import Emitter from '../core/emitter';
import Theme from '../core/theme';
import ColorPicker from '../ui/color-picker';
import IconPicker from '../ui/icon-picker';
import Picker from '../ui/picker';
import Tooltip from '../ui/tooltip';

const ALIGNS = [false, 'center', 'right', 'justify'];

const COLORS = [
  '#000000',
  '#e60000',
  '#ff9900',
  '#ffff00',
  '#008a00',
  '#0066cc',
  '#9933ff',
  '#ffffff',
  '#facccc',
  '#ffebcc',
  '#ffffcc',
  '#cce8cc',
  '#cce0f5',
  '#ebd6ff',
  '#bbbbbb',
  '#f06666',
  '#ffc266',
  '#ffff66',
  '#66b966',
  '#66a3e0',
  '#c285ff',
  '#888888',
  '#a10000',
  '#b26b00',
  '#b2b200',
  '#006100',
  '#0047b2',
  '#6b24b2',
  '#444444',
  '#5c0000',
  '#663d00',
  '#666600',
  '#003700',
  '#002966',
  '#3d1466',
];

const FONTS = [false, 'serif', 'monospace'];

const HEADERS = ['1', '2', '3', false];

const SIZES = ['small', false, 'large', 'huge'];

class BaseTheme extends Theme {
  constructor(quill, options) {
    super(quill, options);
    const listener = e => {
      if (!document.body.contains(quill.root)) {
        document.body.removeEventListener('click', listener);
        return;
      }
      if (
        this.tooltip != null &&
        !this.tooltip.root.contains(e.target) &&
        document.activeElement !== this.tooltip.textbox &&
        !this.quill.hasFocus()
      ) {
        this.tooltip.hide();
      }
      if (this.pickers != null) {
        this.pickers.forEach(picker => {
          if (!picker.container.contains(e.target)) {
            picker.close();
          }
        });
      }
    };
    quill.emitter.listenDOM('click', document.body, listener);
  }

  addModule(name) {
    const module = super.addModule(name);
    if (name === 'toolbar') {
      this.extendToolbar(module);
    }
    return module;
  }

  buildButtons(buttons, icons) {
    Array.from(buttons).forEach(button => {
      const className = button.getAttribute('class') || '';
      className.split(/\s+/).forEach(name => {
        if (!name.startsWith('ql-')) return;
        name = name.slice('ql-'.length);
        if (icons[name] == null) return;
        if (name === 'direction') {
          button.innerHTML = icons[name][''] + icons[name].rtl;
        } else if (typeof icons[name] === 'string') {
          button.innerHTML = icons[name];
        } else {
          const value = button.value || '';
          if (value != null && icons[name][value]) {
            button.innerHTML = icons[name][value];
          }
        }
      });
    });
  }

  buildPickers(selects, icons) {
    this.pickers = Array.from(selects).map(select => {
      if (select.classList.contains('ql-align')) {
        if (select.querySelector('option') == null) {
          fillSelect(select, ALIGNS);
        }
        return new IconPicker(select, icons.align);
      }
      if (
        select.classList.contains('ql-background') ||
        select.classList.contains('ql-color')
      ) {
        const format = select.classList.contains('ql-background')
          ? 'background'
          : 'color';
        if (select.querySelector('option') == null) {
          fillSelect(
            select,
            COLORS,
            format === 'background' ? '#ffffff' : '#000000',
          );
        }
        return new ColorPicker(select, icons[format]);
      }
      if (select.querySelector('option') == null) {
        if (select.classList.contains('ql-font')) {
          fillSelect(select, FONTS);
        } else if (select.classList.contains('ql-header')) {
          fillSelect(select, HEADERS);
        } else if (select.classList.contains('ql-size')) {
          fillSelect(select, SIZES);
        }
      }
      return new Picker(select);
    });
    const update = () => {
      this.pickers.forEach(picker => {
        picker.update();
      });
    };
    this.quill.on(Emitter.events.EDITOR_CHANGE, update);
  }
}
BaseTheme.DEFAULTS = merge({}, Theme.DEFAULTS, {
  modules: {
    toolbar: {
      handlers: {
        formula() {
          this.quill.theme.tooltip.edit('formula');
        },
        image() {
          let fileInput = this.container.querySelector(
            'input.ql-image[type=file]',
          );
          if (fileInput == null) {
            fileInput = document.createElement('input');
            fileInput.setAttribute('type', 'file');
            fileInput.setAttribute(
              'accept',
              this.quill.uploader.options.mimetypes.join(', '),
            );
            fileInput.classList.add('ql-image');
            fileInput.addEventListener('change', () => {
              const range = this.quill.getSelection(true);
              this.quill.uploader.upload(range, fileInput.files);
              fileInput.value = '';
            });
            this.container.appendChild(fileInput);
          }
          fileInput.click();
        },
        video() {
          this.quill.theme.tooltip.edit('video');
        },
      },
    },
  },
});

class BaseTooltip extends Tooltip {
  constructor(quill, boundsContainer) {
    super(quill, boundsContainer);
    this.textbox = this.root.querySelector('input[type="text"]');
    this.listen();
  }

  listen() {
    this.textbox.addEventListener('keydown', event => {
      if (event.key === 'Enter') {
        this.save();
        event.preventDefault();
      } else if (event.key === 'Escape') {
        this.cancel();
        event.preventDefault();
      }
    });
  }

  cancel() {
    this.hide();
  }

  edit(mode = 'link', preview = null) {
    this.root.classList.remove('ql-hidden');
    this.root.classList.add('ql-editing');
    if (preview != null) {
      this.textbox.value = preview;
    } else if (mode !== this.root.getAttribute('data-mode')) {
      this.textbox.value = '';
    }
    this.position(this.quill.getBounds(this.quill.selection.savedRange));
    this.textbox.select();
    this.textbox.setAttribute(
      'placeholder',
      this.textbox.getAttribute(`data-${mode}`) || '',
    );
    this.root.setAttribute('data-mode', mode);
  }

  restoreFocus() {
    const { scrollTop } = this.quill.scrollingContainer;
    this.quill.focus();
    this.quill.scrollingContainer.scrollTop = scrollTop;
  }

  save() {
    let { value } = this.textbox;
    switch (this.root.getAttribute('data-mode')) {
      case 'link': {
        const { scrollTop } = this.quill.root;
        if (this.linkRange) {
          this.quill.formatText(
            this.linkRange,
            'link',
            value,
            Emitter.sources.USER,
          );
          delete this.linkRange;
        } else {
          this.restoreFocus();
          this.quill.format('link', value, Emitter.sources.USER);
        }
        this.quill.root.scrollTop = scrollTop;
        break;
      }
      case 'video': {
        value = extractVideoUrl(value);
      } // eslint-disable-next-line no-fallthrough
      case 'formula': {
        if (!value) break;
        const range = this.quill.getSelection(true);
        if (range != null) {
          const index = range.index + range.length;
          this.quill.insertEmbed(
            index,
            this.root.getAttribute('data-mode'),
            value,
            Emitter.sources.USER,
          );
          if (this.root.getAttribute('data-mode') === 'formula') {
            this.quill.insertText(index + 1, ' ', Emitter.sources.USER);
          }
          this.quill.setSelection(index + 2, Emitter.sources.USER);
        }
        break;
      }
      default:
    }
    this.textbox.value = '';
    this.hide();
  }
}

function extractVideoUrl(url) {
  let match =
    url.match(
      /^(?:(https?):\/\/)?(?:(?:www|m)\.)?youtube\.com\/watch.*v=([a-zA-Z0-9_-]+)/,
    ) ||
    url.match(/^(?:(https?):\/\/)?(?:(?:www|m)\.)?youtu\.be\/([a-zA-Z0-9_-]+)/);
  if (match) {
    return `${match[1] || 'https'}://www.youtube.com/embed/${
      match[2]
    }?showinfo=0`;
  }
  // eslint-disable-next-line no-cond-assign
  if ((match = url.match(/^(?:(https?):\/\/)?(?:www\.)?vimeo\.com\/(\d+)/))) {
    return `${match[1] || 'https'}://player.vimeo.com/video/${match[2]}/`;
  }
  return url;
}

function fillSelect(select, values, defaultValue = false) {
  values.forEach(value => {
    const option = document.createElement('option');
    if (value === defaultValue) {
      option.setAttribute('selected', 'selected');
    } else {
      option.setAttribute('value', value);
    }
    select.appendChild(option);
  });
}

export { BaseTooltip, BaseTheme as default };