class GovukPublishingComponents::Presenters::PageWithStepByStepNavigation

def active_step_by_step
  step_navs_list = step_navs_combined_list
  @active_step_navs ||= step_navs_list.select { |step_nav| step_nav.content_id == active_step_nav_content_id }
  @active_step_navs.first
end

def active_step_by_step?
  active_step_nav_content_id.present? && active_step_by_step.present?
end

def active_step_nav_content_id
  @active_step_nav_content_id ||= @query_parameters["step-by-step-nav"].present? ? @query_parameters["step-by-step-nav"] : nil
end

def also_part_of_step_nav
  step_navs_list = step_navs_combined_list
  step_by_step_navs = step_navs_list.delete_if { |step_nav| step_nav.content_id == active_step_by_step.content_id }
  format_related_links(step_by_step_navs)
end

def configure_for_sidebar(step_nav_content)
  step_nav_content[:steps].each_with_index do |step, step_index|
    step[:contents].each do |content|
      next unless content[:contents]
      content[:contents].each do |link|
        next unless link[:href] == current_path
        link[:active] = true
        step_nav_content[:show_step] = step_index + 1
        step_nav_content[:highlight_step] = step_index + 1
      end
    end
  end
  step_nav_content
end

def current_step_nav
  if active_step_by_step?
    active_step_by_step
  elsif primary_step_by_steps?
    step_navs.first
  elsif show_secondary_step_by_step?
    secondary_step_by_step
  end
end

def format_related_links(step_by_step_navs)
  step_by_step_navs.map do |step_nav|
    {
      href: step_nav.base_path,
      text: step_nav.title,
      tracking_id: step_nav.content_id,
    }
  end
end

def header
  if show_header?
    {
      title: current_step_nav.title,
      path: current_step_nav.base_path,
      tracking_id: current_step_nav.content_id,
    }
  else
    {}
  end
end

def initialize(content_store_response, current_path, query_parameters = {})
  @content_item = content_store_response.to_h.deep_symbolize_keys
  @current_path = current_path
  @query_parameters = query_parameters
end

def parsed_related_to_step_navs
  content_item.dig(:links, :related_to_step_navs).to_a
end

def parsed_secondary_to_step_navs
  content_item.dig(:links, :secondary_to_step_navs).to_a
end

def parsed_step_navs
  content_item.dig(:links, :part_of_step_navs).to_a
end

def primary_step_by_steps?
  step_navs_combined_list.any?
end

def related_links
  step_by_step_navs = if active_step_by_step?
                        [active_step_by_step]
                      elsif step_navs.any?
                        step_navs
                      elsif show_related_links_for_secondary_step_by_steps?
                        secondary_step_by_steps
                      else
                        []
                      end
  format_related_links(step_by_step_navs)
end

def related_to_step_navs
  @related_to_step_navs ||= parsed_related_to_step_navs.map do |step_nav|
    StepByStepModel.new(step_nav)
  end
end

def secondary_step_by_step
  secondary_step_by_steps.first
end

def secondary_step_by_step?
  secondary_step_by_steps.any?
end

def secondary_step_by_steps
  @secondary_step_by_steps ||= parsed_secondary_to_step_navs.map do |step_nav|
    StepByStepModel.new(step_nav)
  end
end

def show_also_part_of_step_nav?
  active_step_by_step? && also_part_of_step_nav.any? && step_navs_combined_list.count < MAX_SECTION_LENGTH
end

def show_header?
  step_navs.count == 1 || active_step_by_step? || show_secondary_step_by_step?
end

def show_related_links?
  if active_step_by_step?
    true
  elsif step_navs.any?
    true
  elsif show_related_links_for_secondary_step_by_steps?
    true
  else
    false
  end
end

def show_related_links_for_secondary_step_by_steps?
  !primary_step_by_steps? && secondary_step_by_step?
end

def show_secondary_step_by_step?
  !primary_step_by_steps? && secondary_step_by_step? && secondary_step_by_steps.count == 1
end

def show_sidebar?
  show_header? && current_step_nav.steps.present?
end

def sidebar
  if show_sidebar?
    @sidebar ||= current_step_nav.content.tap do |sb|
      configure_for_sidebar(sb)
      sb.merge!(small: true, heading_level: 3, tracking_id: current_step_nav.content_id)
    end
  end
end

def step_navs
  @step_navs ||= parsed_step_navs.map do |step_nav|
    StepByStepModel.new(step_nav)
  end
end

def step_navs_combined_list
  step_nav_list = []
  step_nav_list += step_navs if step_navs.any?
  step_nav_list += related_to_step_navs if related_to_step_navs.any?
  step_nav_list
end

def steps
  @steps ||= step_nav[:steps]
end