require 'rails/generators'

module Refills
  class ImportGenerator < Rails::Generators::Base
    desc 'Copy refills'
    source_root File.expand_path("../../../source", __FILE__)
    argument :snippet, type: :string, required: true
    class_option :coffee, type: :boolean, default: false

    def copy_html
      copy_file_if_exists(
        partial_name,
        File.join('app', 'views', 'refills', partial_name),
      )
    end

    def copy_styles
      copy_file_if_exists(
        File.join('stylesheets', 'refills', stylesheet_name),
        File.join('app', 'assets', 'stylesheets', 'refills', stylesheet_name),
      )
    end

    def copy_javascripts
      copy_file_if_exists(
        javascript_path,
        File.join('app', 'assets', 'javascripts', 'refills', javascript_name),
      )
    end

    private

    def copy_file_if_exists(source, destination)
      if File.exists?(File.join(self.class.source_root, source))
        copy_file source, destination
      end
    end

    def partial_name
      "_#{snippet.underscore}.html.erb"
    end

    def stylesheet_name
      "_#{snippet.dasherize}.scss"
    end

    def javascript_name
      "#{snippet.underscore}.#{javascript_extension}"
    end

    def javascript_extension
      if coffee?
        "coffee"
      else
        "js"
      end
    end

    def javascript_path
      if coffee?
        File.join(
          "javascripts",
          "refills",
          "coffeescript",
          javascript_name
        )
      else
        File.join(
          "javascripts",
          "refills",
          javascript_name
        )
      end
    end

    def coffee?
      options[:coffee]
    end
  end
end