require 'open-uri'
require 'csv'
require 'pry'
# ref: http://www.singlecolorimage.com/api.html
class SingleColorImageApi
  BASE_URL = "http://singlecolorimage.com/get"
  def initialize(color_6_digest_hex:, width:, height:, download_path: nil)
    @color_6_digest_hex = color_6_digest_hex
    @width = width
    @height = height
    @download_path = download_path
  end

  def self.download(**args)
    new(args).download
  end
  
  # CSV header must be [color_6_digest_hex, width, height]
  def self.bulk_download(csv_file:)
    colors = CSV.read(csv_file, headers: true).map{|row| row.to_h.map{|k,v| [k.to_sym, v]}.to_h}
    colors.each do |color|
      puts "START #{color}"
      new(**color).download
      puts "FINISH #{color}"
    end
  end

  def download
    open(file_path, 'w') do |f|
      open(request_uri) do |data|
        f.write(data.read)
      end
    end
  end

  private

  attr_reader :color_6_digest_hex, :width, :height, :download_path

  def image_size
    "#{width}x#{height}"
  end

  def file_name
    "#{color_6_digest_hex}-#{image_size}.png"
  end

  def file_path
    File.join(donwload_dir, file_name)
  end

  def request_uri
    URI.join("#{BASE_URL}/", "#{color_6_digest_hex}/", image_size).tap{|t| puts t}
  end

  def donwload_dir
     download_path || FileUtils.mkdir_p(File.join("/tmp", "simple_images")).join
  end
end

# ex
# SingleColorImageApi.download(color_6_digest_hex: "33fd8f", width: "400", height: "100")

SingleColorImageApi.bulk_download(csv_file: "color.csv")