ryz310/my_api_client

# frozen_string_literal: true

# A Pagination API
class PaginationController < ApplicationController
  # GET pagination
  def index
    case params[:page]&.to_s
    when '1', nil
      render status: :ok, json: first_page
    when '2'
      render status: :ok, json: second_page
    when '3'
      render status: :ok, json: third_page
    else
      render status: :not_found, json: ''
    end
  end

  private

  def first_page
    {
      links: {
        next: page_link(2),
      },
      page: 1,
    }
  end

  def second_page
    {
      links: {
        next: page_link(3),
        previous: page_link(1),
      },
      page: 2,
    }
  end

  def third_page
    {
      links: {
        previous: page_link(2),
      },
      page: 3,
    }
  end

  # NOTE: `#pagination_url` returns `http://xxxxx.execute-api.ap-northeast-1.amazonaws.com/pagination`
  #       but it should be `https://xxxxx.execute-api.ap-northeast-1.amazonaws.com/dev/pagination`.
  #       So this is workaround.
  def page_link(page)
    query_strings = "?#{{ page: }.to_query}"
    uri = File.join(ENV.fetch('JETS_HOST', nil), ENV.fetch('JETS_STAGE', nil), pagination_path)
    uri.sub!('http://', 'https://')
    URI.join(uri, query_strings)
  end
end