# frozen_string_literal: true

# Provides an action which fetches a metrics dashboard according
# to the parameters specified by the controller.
module MetricsDashboard
  extend ActiveSupport::Concern

  def metrics_dashboard
    result = dashboard_finder.find(
      project_for_dashboard,
      current_user,
      metrics_dashboard_params
    )

    if include_all_dashboards?
      result[:all_dashboards] = dashboard_finder.find_all_paths(project_for_dashboard)
    end

    respond_to do |format|
      if result[:status] == :success
        format.json { render dashboard_success_response(result) }
      else
        format.json { render dashboard_error_response(result) }
      end
    end
  end

  private

  # Override in class to provide arguments to the finder.
  def metrics_dashboard_params
    {}
  end

  # Override in class if response requires complete list of
  # dashboards in addition to requested dashboard body.
  def include_all_dashboards?
    false
  end

  def dashboard_finder
    ::Gitlab::Metrics::Dashboard::Finder
  end

  # Project is not defined for group and admin level clusters.
  def project_for_dashboard
    defined?(project) ? project : nil
  end

  def dashboard_success_response(result)
    {
      status: :ok,
      json: result.slice(:all_dashboards, :dashboard, :status)
    }
  end

  def dashboard_error_response(result)
    {
      status: result[:http_status],
      json: result.slice(:all_dashboards, :message, :status)
    }
  end
end