require 'spec_helper'

module LicenseFinder
  describe Diff do
    subject { Diff }

    let(:diff) { subject.compare(file1_content, file2_content) }

    def find_package_with_name(name)
      diff.find_all { |d| d.name == name }
    end

    describe '#compare' do
      context 'when a dependency is added' do
        let(:file1_content) { "nokogiri,1.6.6.2,MIT" }
        let(:file2_content) { "nokogiri,1.6.6.2,MIT\nrspec,3.2.0,MIT" }

        it 'should create and set packages with added diff state' do
          rspec = find_package_with_name('rspec')[0]
          expect(rspec.status).to eq :added
        end
      end

      context 'when a dependency is removed' do
        let(:file1_content) { "nokogiri,1.6.6.2,MIT\nrspec,3.2.0,MIT" }
        let(:file2_content) { "nokogiri,1.6.6.2,MIT" }

        it 'should create and set packages with removed diff state' do
          rspec = find_package_with_name('rspec')[0]
          expect(rspec.status).to eq :removed
        end
      end

      context 'when a dependency is unchanged' do
        let(:file1_content) { "nokogiri,1.6.6.2,MIT" }
        let(:file2_content) { "nokogiri,1.6.6.2,MIT" }

        it 'should create and set packages with unchanged diff state' do
          nokogiri = find_package_with_name('nokogiri')[0]
          expect(nokogiri.status).to eq :unchanged
        end
      end

      context 'when there are all types of changes' do
        let(:file1_content) { "rspec,3.2.0,MIT\nnokogiri,1.6.6.2,MIT\nfakefs,0.6.7,MIT" }
        let(:file2_content) { "nokogiri,1.6.6.2,MIT\nminitest,5.7.0,MIT\nfakefs,0.6.7,BSD" }

        it 'should create and set packages diff states' do
          expect(find_package_with_name('minitest')[0].status).to eq :added
          expect(find_package_with_name('rspec')[0].status).to eq :removed
          expect(find_package_with_name('nokogiri')[0].status).to eq :unchanged
        end
      end

      context 'when the version changes' do
        let(:file1_content) { "rspec,3.2.0,MIT" }
        let(:file2_content) { "rspec,3.3.0,MIT" }

        it 'should add the new version and remove the previous version' do
          rspecs = find_package_with_name('rspec')
          expect(rspecs.size).to eq(2)
          rspecs.each do |rspec|
            case rspec.status
              when :removed
                expect(rspec.version).to eq('3.2.0')
              when :added
                expect(rspec.version).to eq('3.3.0')
            end
          end
        end

        context 'when there are two versions of the same dependency' do
          let(:file1_content) { "rspec,3.2.0,MIT\nrspec,1.1.0,MIT\nnokogiri,1.6.6.2,MIT" }
          let(:file2_content) { "rspec,3.3.0,MIT\nrspec,1.1.0,MIT\nnokogiri,1.6.6.2,MIT" }
          it 'should identify which version was updated' do
            rspecs = find_package_with_name('rspec')
            expect(rspecs.size).to eq(3)
            rspecs.each do |rspec|
              case rspec.status
                when :removed
                  expect(rspec.version).to eq('3.2.0')
                when :added
                  expect(rspec.version).to eq('3.3.0')
                else
                  expect(rspec.status).to eq(:unchanged)
                  expect(rspec.version).to eq('1.1.0')
              end
            end
          end
        end
      end

      context 'when the license changes' do
        let(:file1_content) { "rspec,3.2.0,MIT" }
        let(:file2_content) { "rspec,3.3.0,GPLv2" }

        it 'should set the state to unchanged and record the version change' do
          rspec_old = diff.find {|p| p.version == '3.2.0'}
          rspec_new = diff.find {|p| p.version == '3.3.0'}

          expect(rspec_old.status).to eq(:removed)
          expect(rspec_old.version).to eq('3.2.0')

          expect(rspec_new.status).to eq(:added)
          expect(rspec_new.version).to eq('3.3.0')
        end
      end

      context 'when the files are merged reports' do
        let(:file1_content) { "rspec,3.2.0,MIT,\"/path/to/project1,/path/to/project2\"" }
        let(:file2_content) { "rspec,3.2.0,MIT,\"/path/to/project1,/path/to/project2\"\nrails,4.2.0,MIT,/path/to/project1" }

        it 'should show the diff of the reports' do
          rspec = find_package_with_name('rspec')[0]
          expect(rspec.status).to eq(:unchanged)
          expect(rspec.version).to eq('3.2.0')
          paths = ['/path/to/project1', '/path/to/project2'].map { |p| File.absolute_path(p) }
          expect(rspec.subproject_paths).to match_array(paths)

          rails = find_package_with_name('rails')[0]
          expect(rails.status).to eq(:added)
          expect(rails.version).to eq('4.2.0')
          paths = ['/path/to/project1'].map { |p| File.absolute_path(p) }
          expect(rails.subproject_paths).to match_array(paths)
        end
      end
    end
  end
end