Getcolors

require 'rmagick'

class GetColors

  def initialize(image, brand, campaign=nil)
    @image = image
    @brand = brand
    @campaign = campaign
  end

  def perform
    colors_from_image
  end

  private

  def colors_from_image
    url = @image.gsub('https', 'http')
    original = Magick::Image.read(url).first
    quantized = original.quantize(6, Magick::RGBColorspace)
    colors = sort_light_to_dark(quantized)
    set_colors(colors)
  end

  def sort_light_to_dark(img)
    histo = img.color_histogram
    histo.sort_by { |a| -a[0].to_hsla[2] }.map { |color, count| color }
  end

  def set_colors(colors)
    count = 1
    hex_list = []
    colors.each do |color|
      hex = color.to_color(Magick::AllCompliance, false, 8, true)
      color_attr = "color" + count.to_s
      hex_list.push hex
      # Update brand colors
      @brand.send("#{color_attr}=", hex)
      @brand.save!
      bc = @brand.colors.create(name: "color" + count.to_s, value: hex)
      bc.save

      # Update campaign colors
      if @campaign.present?
        @campaign.send("#{color_attr}=", hex)
        @campaign.save!
      end

      count += 1
    end

    if @campaign.present?
      # Loop through @campaign background widgets and update bg_colors
      if @campaign.widgets
        @campaign.widgets.where(type: 'BackgroundWidget').each_with_index do |widget, i|
          if hex_list[i].present?
            widget.bg_color = hex_list[i]
          else
            widget.bg_color = hex_list.sample
          end
          widget.save!
        end
      end

      if @campaign.login_object
        @campaign.login_object.button_color = hex_list[3]
        @campaign.login_object.font_color = hex_list[2]
        @campaign.login_object.save!
      end
    end
  end
end