require 'test_helper.rb'

class PaginateResponderTest < ActionController::TestCase
  tests PaginateController

  def json; JSON[@response.body] end

  def test_pagination
    get :index, :format => :json

    assert_equal 50, json.size
    assert_equal ('AA'..'zz').to_a[0..49], json
  end

  def test_pagination_page_2
    get :index, :format => :json, :page => 2

    assert_equal 50, json.size
    assert_equal ('AA'..'zz').to_a[50..99], json
  end

  def test_pagination_per_page
    get :index, :format => :json, :page => 1, :per_page => 10

    assert_equal 10, json.size
    assert_equal ('AA'..'zz').to_a[0..9], json
  end

  def test_pagination_per_page_page_2
    get :index, :format => :json, :page => 2, :per_page => 10

    assert_equal 10, json.size
    assert_equal ('AA'..'zz').to_a[10..19], json
  end

  def test_headers
    get :index, :format => :json

    assert_equal 3, response.links.size

    assert_equal "first", response.links[0][:params][:rel]
    assert_equal "http://test.host/index.json?page=1", response.links[0][:url]

    assert_equal "next", response.links[1][:params][:rel]
    assert_equal "http://test.host/index.json?page=2", response.links[1][:url]

    assert_equal "last", response.links[2][:params][:rel]
    assert_equal "http://test.host/index.json?page=14", response.links[2][:url]
  end

  def test_headers_page_2
    get :index, :format => :json, :page => 2

    assert_equal 4, response.links.size

    assert_equal "first", response.links[0][:params][:rel]
    assert_equal "http://test.host/index.json?page=1", response.links[0][:url]

    assert_equal "prev", response.links[1][:params][:rel]
    assert_equal "http://test.host/index.json?page=1", response.links[1][:url]

    assert_equal "next", response.links[2][:params][:rel]
    assert_equal "http://test.host/index.json?page=3", response.links[2][:url]

    assert_equal "last", response.links[3][:params][:rel]
    assert_equal "http://test.host/index.json?page=14", response.links[3][:url]
  end

  def test_headers_page_5
    get :index, :format => :json, :page => 5

    assert_equal 4, response.links.size

    assert_equal "first", response.links[0][:params][:rel]
    assert_equal "http://test.host/index.json?page=1", response.links[0][:url]

    assert_equal "prev", response.links[1][:params][:rel]
    assert_equal "http://test.host/index.json?page=4", response.links[1][:url]

    assert_equal "next", response.links[2][:params][:rel]
    assert_equal "http://test.host/index.json?page=6", response.links[2][:url]

    assert_equal "last", response.links[3][:params][:rel]
    assert_equal "http://test.host/index.json?page=14", response.links[3][:url]
  end

  def test_headers_last_page
    get :index, :format => :json, :page => 14

    assert_equal 3, response.links.size

    assert_equal "first", response.links[0][:params][:rel]
    assert_equal "http://test.host/index.json?page=1", response.links[0][:url]

    assert_equal "prev", response.links[1][:params][:rel]
    assert_equal "http://test.host/index.json?page=13", response.links[1][:url]

    assert_equal "last", response.links[2][:params][:rel]
    assert_equal "http://test.host/index.json?page=14", response.links[2][:url]
  end

  def test_headers_page_before_last_page
    get :index, :format => :json, :page => 13

    assert_equal 4, response.links.size

    assert_equal "first", response.links[0][:params][:rel]
    assert_equal "http://test.host/index.json?page=1", response.links[0][:url]

    assert_equal "prev", response.links[1][:params][:rel]
    assert_equal "http://test.host/index.json?page=12", response.links[1][:url]

    assert_equal "next", response.links[2][:params][:rel]
    assert_equal "http://test.host/index.json?page=14", response.links[2][:url]

    assert_equal "last", response.links[3][:params][:rel]
    assert_equal "http://test.host/index.json?page=14", response.links[3][:url]
  end

  def test_headers_per_page
    get :index, :format => :json, :page => 1, :per_page => 10

    assert_equal 3, response.links.size

    assert_equal "first", response.links[0][:params][:rel]
    assert_equal "http://test.host/index.json?page=1&per_page=10", response.links[0][:url]

    assert_equal "next", response.links[1][:params][:rel]
    assert_equal "http://test.host/index.json?page=2&per_page=10", response.links[1][:url]

    assert_equal "last", response.links[2][:params][:rel]
    assert_equal "http://test.host/index.json?page=68&per_page=10", response.links[2][:url]
  end

  def test_headers_total_pages
    get :index, :format => :json

    assert_equal "14", response.headers["X-Total-Pages"]
  end
end