# frozen_string_literal: true

require 'spec_helper'

describe MergeRequestDiffFile do
  describe '#diff' do
    context 'when diff is not stored' do
      let(:unpacked) { 'unpacked' }
      let(:packed) { [unpacked].pack('m0') }

      before do
        subject.diff = packed
      end

      context 'when the diff is marked as binary' do
        before do
          subject.binary = true
        end

        it 'unpacks from base 64' do
          expect(subject.diff).to eq(unpacked)
        end
      end

      context 'when the diff is not marked as binary' do
        it 'returns the raw diff' do
          expect(subject.diff).to eq(packed)
        end
      end
    end

    context 'when diff is stored in DB' do
      let(:file) { create(:merge_request).merge_request_diff.merge_request_diff_files.first }

      it 'returns UTF-8 string' do
        expect(file.diff.encoding).to eq Encoding::UTF_8
      end
    end

    context 'when diff is stored in external storage' do
      let(:file) { create(:merge_request).merge_request_diff.merge_request_diff_files.first }
      let(:test_dir) { 'tmp/tests/external-diffs' }

      around do |example|
        FileUtils.mkdir_p(test_dir)

        begin
          example.run
        ensure
          FileUtils.rm_rf(test_dir)
        end
      end

      before do
        stub_external_diffs_setting(enabled: true, storage_path: test_dir)
      end

      it 'returns UTF-8 string' do
        expect(file.diff.encoding).to eq Encoding::UTF_8
      end
    end
  end

  describe '#utf8_diff' do
    it 'does not raise error when the diff is binary' do
      subject.diff = "\x05\x00\x68\x65\x6c\x6c\x6f"

      expect { subject.utf8_diff }.not_to raise_error
    end
  end
end