# frozen_string_literal: true

class Api::V1::Statuses::ReferredByStatusesController < Api::BaseController
  include Authorization

  before_action -> { authorize_if_got_token! :read, :'read:accounts' }
  before_action :set_status
  after_action :insert_pagination_headers

  def index
    @statuses = load_statuses
    render json: @statuses, each_serializer: REST::StatusSerializer, relationships: StatusRelationshipsPresenter.new(@statuses, current_user&.account_id)
  end

  private

  def load_statuses
    cached_references
  end

  def cached_references
    cache_collection(results, Status)
  end

  def results
    @results ||= Status.where(id: @status.referenced_by_status_objects.select(:status_id)).paginate_by_max_id(
      limit_param(DEFAULT_STATUSES_LIMIT),
      params[:max_id],
      params[:since_id]
    )
  end

  def insert_pagination_headers
    set_pagination_headers(next_path, prev_path)
  end

  def next_path
    api_v1_status_referred_by_index_url pagination_params(max_id: pagination_max_id) if records_continue?
  end

  def prev_path
    api_v1_status_referred_by_index_url pagination_params(min_id: pagination_since_id) unless results.empty?
  end

  def pagination_max_id
    results.last.id
  end

  def pagination_since_id
    results.first.id
  end

  def records_continue?
    results.size == limit_param(DEFAULT_STATUSES_LIMIT)
  end

  def set_status
    @status = Status.find(params[:status_id])
    authorize @status, :show?
  rescue Mastodon::NotPermittedError
    not_found
  end

  def pagination_params(core_params)
    params.slice(:limit).permit(:limit).merge(core_params)
  end
end