require 'xing/specdoc/document'
require 'xing/specdoc/winnower'

describe Xing::SpecDoc::Winnower do
  subject :winnower do
    Xing::SpecDoc::Winnower.new(new_docs, old_docs)
  end

  let :first_content do
    { "a" => "a" }.to_json
  end

  let :second_content do
    { "something" => "else" }.to_json
  end

  let :third_content do
    { "something_completely" => "else" }.to_json
  end

  let :new_docs do
    new_contents.each_with_index.map do |content, index|
      Xing::SpecDoc::Document.new("new_path_#{index}", content)
    end
  end

  let :old_docs do
    old_contents.each_with_index.map do |content, index|
      Xing::SpecDoc::Document.new("old_path_#{index}", content)
    end
  end

  let :old_paths do
    old_docs.map(&:path)
  end

  let :new_contents do
    []
  end

  let :old_contents do
    []
  end

  context "should reduce extraneous new docs" do
    let :new_contents do
      [ first_content, first_content, first_content ]
    end

    it "should strip the extras" do
      expect(winnower.kept_new.length).to eq(1)
    end

    it "should not invent obsoletes" do
      expect(winnower.obsolete_paths.length).to eq(0)
    end
  end

  context "should prefer existing docs" do
    let :new_contents do
      [ first_content ]
    end

    let :old_contents do
      [ first_content ]
    end

    it "should strip the duplicate new docs" do
      expect(winnower.kept_new.length).to eq(0)
    end

    it "should not consider incumbents obsolete" do
      expect(winnower.obsolete_paths.length).to eq(0)
    end
  end

  context "should consider old docs without support obsolete" do
    let :new_contents do
      [ first_content ]
    end

    let :old_contents do
      [ second_content ]
    end

    it "should strip the duplicate new docs" do
      expect(winnower.kept_new.length).to eq(1)
    end

    it "should not consider incumbents obsolete" do
      expect(winnower.obsolete_paths.length).to eq(1)
    end
  end

  context "whole set up" do
    let :new_contents do
      [ first_content, second_content ]
    end

    let :old_contents do
      [ second_content, third_content ]
    end

    it "should strip the duplicate new docs" do
      expect(winnower.kept_new.length).to eq(1)
    end

    it "should not consider incumbents obsolete" do
      expect(winnower.obsolete_paths.length).to eq(1)
    end
  end
end