class ImageController
  def self.default_image(url, char_id, rating)
    image = CharImage.where(char_id: char_id).find_by(keyword: 'Default')

    if url.nil?
      image&.destroy
      return
    end

    if image
      image.update(url: url)
    else
      CharImage.create(
        char_id: char_id,
        url: url,
        category: rating,
        keyword: 'Default'
      )
    end
  end

  def self.edit_image(params)
    img_hash = CharImage.from_form(params)
    char_id = img_hash['char_id']
    keyword = img_hash['keyword']

    img = CharImage.where(char_id: char_id).find_by(keyword: keyword)

    if img
      img.update(img_hash)
      img.reload
    else
      img = CharImage.create(img_hash)
    end

    img
  end

  def self.img_scroll(char_id:, nsfw: false, img: nil, dir: nil)
    imgs = if nsfw
             CharImage.where(char_id: char_id)
           else
             CharImage.where(char_id: char_id, category: 'SFW')
           end

    cur_i = img ? imgs.index { |i| i[:id] == img } : imgs.length - 1

    nex_i = case dir
            when :left
              cur_i == 0 ? imgs.length - 1 : cur_i - 1
            else
              cur_i == imgs.length - 1 ? 0 : cur_i + 1
            end

    imgs[nex_i]
  end
end