# frozen_string_literal: true

require 'spec_helper'
require 'diff/lcs/hunk'

describe 'Diff::LCS Issues' do
  include Diff::LCS::SpecHelper::Matchers

  describe 'issue #1' do
    shared_examples 'handles simple diffs' do |s1, s2, forward_diff|
      before do
        @diff_s1_s2 = Diff::LCS.diff(s1, s2)
      end

      it 'creates the correct diff' do
        expect(change_diff(forward_diff)).to eq(@diff_s1_s2)
      end

      it 'creates the correct patch s1->s2' do
        expect(Diff::LCS.patch(s1, @diff_s1_s2)).to eq(s2)
      end

      it 'creates the correct patch s2->s1' do
        expect(Diff::LCS.patch(s2, @diff_s1_s2)).to eq(s1)
      end
    end

    describe 'string' do
      it_has_behavior 'handles simple diffs', 'aX', 'bXaX', [
        [
          ['+', 0, 'b'],
          ['+', 1, 'X']
        ]
      ]
      it_has_behavior 'handles simple diffs', 'bXaX', 'aX', [
        [
          ['-', 0, 'b'],
          ['-', 1, 'X']
        ]
      ]
    end

    describe 'array' do
      it_has_behavior 'handles simple diffs', %w(a X), %w(b X a X), [
        [
          ['+', 0, 'b'],
          ['+', 1, 'X']
        ]
      ]
      it_has_behavior 'handles simple diffs', %w(b X a X), %w(a X), [
        [
          ['-', 0, 'b'],
          ['-', 1, 'X']
        ]
      ]
    end
  end

  describe 'issue #57' do
    it 'should fail with a correct error' do
      expect {
        actual = { :category => 'app.rack.request' }
        expected = { :category => 'rack.middleware', :title => 'Anonymous Middleware' }
        expect(actual).to eq(expected)
      }.to raise_error(RSpec::Expectations::ExpectationNotMetError)
    end
  end

  describe 'issue #60' do
    it 'should produce unified output with correct context' do
      old_data = <<-DATA_OLD.strip.split("\n").map(&:chomp)
{
  "name": "x",
  "description": "hi"
}
      DATA_OLD

      new_data = <<-DATA_NEW.strip.split("\n").map(&:chomp)
{
  "name": "x",
  "description": "lo"
}
      DATA_NEW

      diff = ::Diff::LCS.diff(old_data, new_data)
      hunk = ::Diff::LCS::Hunk.new(old_data, new_data, diff.first, 3, 0)

      expect(hunk.diff(:unified)).to eq(<<-EXPECTED.chomp)
@@ -1,5 +1,5 @@
 {
   "name": "x",
-  "description": "hi"
+  "description": "lo"
 }
      EXPECTED
    end
  end

  describe 'issue #65' do
    def diff_lines(old_lines, new_lines)
      file_length_difference = 0
      previous_hunk = nil
      output = []

      Diff::LCS.diff(old_lines, new_lines).each do |piece|
        hunk = Diff::LCS::Hunk.new(old_lines, new_lines, piece, 3, file_length_difference)
        file_length_difference = hunk.file_length_difference
        maybe_contiguous_hunks = (previous_hunk.nil? || hunk.merge(previous_hunk))

        output << "#{previous_hunk.diff(:unified)}\n" unless maybe_contiguous_hunks

        previous_hunk = hunk
      end
      output << "#{previous_hunk.diff(:unified, true)}\n" unless previous_hunk.nil?
      output.join
    end

    it 'should not misplace the new chunk' do
      old_data = [
        'recipe[a::default]', 'recipe[b::default]', 'recipe[c::default]',
        'recipe[d::default]', 'recipe[e::default]', 'recipe[f::default]',
        'recipe[g::default]', 'recipe[h::default]', 'recipe[i::default]',
        'recipe[j::default]', 'recipe[k::default]', 'recipe[l::default]',
        'recipe[m::default]', 'recipe[n::default]'
      ]

      new_data = [
        'recipe[a::default]', 'recipe[c::default]', 'recipe[d::default]',
        'recipe[e::default]', 'recipe[f::default]', 'recipe[g::default]',
        'recipe[h::default]', 'recipe[i::default]', 'recipe[j::default]',
        'recipe[k::default]', 'recipe[l::default]', 'recipe[m::default]',
        'recipe[n::default]', 'recipe[o::new]', 'recipe[p::new]',
        'recipe[q::new]', 'recipe[r::new]'
      ]

      expect(diff_lines(old_data, new_data)).to eq(<<-EODIFF)
@@ -1,5 +1,4 @@
 recipe[a::default]
-recipe[b::default]
 recipe[c::default]
 recipe[d::default]
 recipe[e::default]
@@ -12,3 +11,7 @@
 recipe[l::default]
 recipe[m::default]
 recipe[n::default]
+recipe[o::new]
+recipe[p::new]
+recipe[q::new]
+recipe[r::new]
      EODIFF
    end
  end
end
