module Repost
  class Senpai < Action
    DEFAULT_SUBMIT_BUTTON_TEXT = 'Continue'
    DEFAULT_CHARSET = 'UTF-8'

    def initialize(url, params: {}, options: {})
      @url                = url
      @params             = params
      @options            = options
      @method             = options.fetch(:method, :post)
      @authenticity_token = options.fetch(:authenticity_token, nil)
      @charset            = options.fetch(:charset, DEFAULT_CHARSET)
      @form_id            = options.fetch(:form_id, generated_form_id)
      @autosubmit         = options.fetch(:autosubmit, true)
      @section_classes    = nil#options.dig(:decor, :section, :classes)
      @section_html       = nil#options.dig(:decor, :section, :html)
      @submit_classes     = nil#options.dig(:decor, :submit, :classes)
      @submit_text        = DEFAULT_SUBMIT_BUTTON_TEXT#options.dig(:decor, :submit, :text) || DEFAULT_SUBMIT_BUTTON_TEXT
    end

    def perform
      compiled_body = if autosubmit
        form_body << auto_submit_script << no_script
      else
        form_body << submit_section
      end
      form_head << compiled_body << form_footer
    end

    private

    attr_reader :url, :params, :options, :method, :form_id, :autosubmit,
                :section_classes, :section_html, :submit_classes,
                :submit_text, :authenticity_token, :charset

    def form_head
      "<form id='#{form_id}' action='#{url}' method='#{method}' accept-charset='#{charset}'>"
    end

    def form_body
      inputs = params.map do |key, value|
        "<input type='hidden' name='#{key}' value='#{value}'>"
      end
      inputs.unshift(csrf_token) if authenticity_token
      inputs.join
    end

    def form_footer
      "</form>"
    end

    def csrf_token
      "<input name='authenticity_token' value='#{authenticity_token}' type='hidden'>"
    end

    def no_script
      "<noscript>
        #{submit_section}
      </noscript>"
    end

    def submit_section
      "<div class='#{section_classes}'>
        #{section_html}
        <input class='#{submit_classes}' type='submit' value='#{submit_text}'></input>
      </div>"
    end

    def generated_form_id
      "repost-#{Time.now.to_i}"
    end

    def auto_submit_script
      "<script>
        document.getElementById('#{form_id}').submit();
      </script>"
    end
  end
end