# frozen_string_literal: true

require 'spec_helper'

if String.method_defined?(:encoding)
  require 'diff/lcs/hunk'

  describe Diff::LCS::Hunk do
    let(:old_data) { ['Tu a un carté avec {count} itéms'.encode('UTF-16LE')] }
    let(:new_data) { ['Tu a un carte avec {count} items'.encode('UTF-16LE')] }
    let(:pieces)   { Diff::LCS.diff old_data, new_data }
    let(:hunk)     { Diff::LCS::Hunk.new(old_data, new_data, pieces[0], 3, 0) }

    it 'produces a unified diff from the two pieces' do
      expected = <<-EXPECTED.gsub(/^\s+/, '').encode('UTF-16LE').chomp
        @@ -1 +1 @@
        -Tu a un carté avec {count} itéms
        +Tu a un carte avec {count} items
      EXPECTED

      expect(hunk.diff(:unified)).to eq(expected)
    end

    it 'produces a unified diff from the two pieces (last entry)' do
      expected = <<-EXPECTED.gsub(/^\s+/, '').encode('UTF-16LE').chomp
        @@ -1 +1 @@
        -Tu a un carté avec {count} itéms
        +Tu a un carte avec {count} items
        \\ No newline at end of file
      EXPECTED

      expect(hunk.diff(:unified, true)).to eq(expected)
    end

    it 'produces a context diff from the two pieces' do
      expected = <<-EXPECTED.gsub(/^\s+/, '').encode('UTF-16LE').chomp
        ***************
        *** 1 ****
        ! Tu a un carté avec {count} itéms
        --- 1 ----
        ! Tu a un carte avec {count} items
      EXPECTED

      expect(hunk.diff(:context)).to eq(expected)
    end

    it 'produces an old diff from the two pieces' do
      expected = <<-EXPECTED.gsub(/^ +/, '').encode('UTF-16LE').chomp
        1c1
        < Tu a un carté avec {count} itéms
        ---
        > Tu a un carte avec {count} items

      EXPECTED

      expect(hunk.diff(:old)).to eq(expected)
    end

    it 'produces a reverse ed diff from the two pieces' do
      expected = <<-EXPECTED.gsub(/^ +/, '').encode('UTF-16LE').chomp
        c1
        Tu a un carte avec {count} items
        .

      EXPECTED

      expect(hunk.diff(:reverse_ed)).to eq(expected)
    end

    context 'with empty first data set' do
      let(:old_data) { [] }

      it 'produces a unified diff' do
        expected = <<-EXPECTED.gsub(/^\s+/, '').encode('UTF-16LE').chomp
          @@ -1 +1,2 @@
          +Tu a un carte avec {count} items
        EXPECTED

        expect(hunk.diff(:unified)).to eq(expected)
      end
    end
  end
end
