if respond_to?(:require_relative, true)
  require_relative 'common'
else
  require File.dirname(__FILE__) + '/common'
end

describe RestGraph do
  after do
    WebMock.reset!
    RR.verify
  end

  should 'get the next/prev page' do
    rg = RestGraph.new
    %w[next previous].each{ |type|
      kind = "#{type}_page"
      rg.send(kind, {})              .should == nil
      rg.send(kind, {'paging' => []}).should == nil
      rg.send(kind, {'paging' => {}}).should == nil

      stub_request(:get, 'zzz').to_return(:body => '["ok"]')
      rg.send(kind, {'paging' => {type => 'zzz'}}).should == ['ok']
    }
  end

  should 'merge all pages into one' do
    rg = RestGraph.new
    %w[next previous].each{ |type|
      kind = "#{type}_page"
      data = {'paging' => {type => 'zzz'}, 'data' => ['z']}

      # invalid pages or just the page itself
      (-1..1).each{ |page|
        rg.for_pages(data, page, {}, kind).should == data
      }

      (2..4).each{ |pages|
        # merge data
        stub_request(:get, 'zzz').to_return(:body => '{"data":["y"]}')
        rg.for_pages(data, pages, {}, kind).should == {'data' => %w[z y]}

        # this data cannot be merged
        stub_request(:get, 'zzz').to_return(:body => '{"data":"y"}')
        rg.for_pages(data, pages, {}, kind).should == {'data' => %w[z]}
      }

      stub_request(:get, 'zzz').to_return(:body =>
        '{"paging":{"'+type+'":"yyy"},"data":["y"]}')
      stub_request(:get, 'yyy').to_return(:body => '{"data":["x"]}')

      rg.for_pages(data, 3, {}, kind).should == {'data' => %w[z y x]}
    }
  end

  should 'for_pages with callback' do
    rg = RestGraph.new
    %w[next previous].each{ |type|
      kind = "#{type}_page"
      data = {'paging' => {type => 'zzz'}, 'data' => ['z']}

      # invalid pages or just the page itself
      nils = 0
      ranges = -1..1
      ranges.each{ |page|
        rg.for_pages(data, page, {}, kind){ |r|
          if r
            r.should == data
          else
            nils += 1
          end
        }.should == data
      }
      nils.should == ranges.to_a.size

      (2..4).each{ |pages|
        # merge data
        stub_request(:get, 'zzz').to_return(:body => '{"data":["y"]}')
        expects = [{'data' => %w[y]}, nil]
        rg.for_pages(data, pages, {}, kind){ |r|
          r.should == expects.shift
        }.should == {'data' => %w[z y]}
        expects.empty?.should == true

        # this data cannot be merged
        stub_request(:get, 'zzz').to_return(:body => '{"data":"y"}')
        expects = [{'data' => 'y'}, nil]
        rg.for_pages(data, pages, {}, kind){ |r|
          r.should == expects.shift
        }.should == {'data' => %w[z]}
        expects.empty?.should == true
      }

      stub_request(:get, 'zzz').to_return(:body =>
        '{"paging":{"'+type+'":"yyy"},"data":["y"]}')
      stub_request(:get, 'yyy').to_return(:body => '{"data":["x"]}')

      expects = [{'data' => %w[y]}, {'data' => %w[x]}, nil]
      rg.for_pages(data, 3, {}, kind){ |rr|
        if rr
          r = rr.dup
          r.delete('paging')
        else
          r = rr
        end
        r.should == expects.shift
      }.should == {'data' => %w[z y x]}
    }
  end
end