require 'spec_helper'

describe Gitlab::Ci::Trace::Stream do
  describe 'delegates' do
    subject { described_class.new { nil } }

    it { is_expected.to delegate_method(:close).to(:stream) }
    it { is_expected.to delegate_method(:tell).to(:stream) }
    it { is_expected.to delegate_method(:seek).to(:stream) }
    it { is_expected.to delegate_method(:size).to(:stream) }
    it { is_expected.to delegate_method(:path).to(:stream) }
    it { is_expected.to delegate_method(:truncate).to(:stream) }
    it { is_expected.to delegate_method(:valid?).to(:stream).as(:present?) }
    it { is_expected.to delegate_method(:file?).to(:path).as(:present?) }
  end

  describe '#limit' do
    let(:stream) do
      described_class.new do
        StringIO.new((1..8).to_a.join("\n"))
      end
    end

    it 'if size is larger we start from beginning' do
      stream.limit(20)

      expect(stream.tell).to eq(0)
    end

    it 'if size is smaller we start from the end' do
      stream.limit(2)

      expect(stream.raw).to eq("8")
    end

    context 'when the trace contains ANSI sequence and Unicode' do
      let(:stream) do
        described_class.new do
          File.open(expand_fixture_path('trace/ansi-sequence-and-unicode'))
        end
      end

      it 'forwards to the next linefeed, case 1' do
        stream.limit(7)

        result = stream.raw

        expect(result).to eq('')
        expect(result.encoding).to eq(Encoding.default_external)
      end

      it 'forwards to the next linefeed, case 2' do
        stream.limit(29)

        result = stream.raw

        expect(result).to eq("\e[01;32m許功蓋\e[0m\n")
        expect(result.encoding).to eq(Encoding.default_external)
      end

      # See https://gitlab.com/gitlab-org/gitlab-ce/issues/30796
      it 'reads in binary, output as Encoding.default_external' do
        stream.limit(52)

        result = stream.html

        expect(result).to eq("ヾ(´༎ຶД༎ຶ`)ﾉ<br><span class=\"term-fg-green\">許功蓋</span><br>")
        expect(result.encoding).to eq(Encoding.default_external)
      end
    end
  end

  describe '#append' do
    let(:tempfile) { Tempfile.new }

    let(:stream) do
      described_class.new do
        tempfile.write("12345678")
        tempfile.rewind
        tempfile
      end
    end

    after do
      tempfile.unlink
    end

    it "truncates and append content" do
      stream.append("89", 4)
      stream.seek(0)

      expect(stream.size).to eq(6)
      expect(stream.raw).to eq("123489")
    end

    it 'appends in binary mode' do
      '😺'.force_encoding('ASCII-8BIT').each_char.with_index do |byte, offset|
        stream.append(byte, offset)
      end

      stream.seek(0)

      expect(stream.size).to eq(4)
      expect(stream.raw).to eq('😺')
    end
  end

  describe '#set' do
    let(:stream) do
      described_class.new do
        StringIO.new("12345678")
      end
    end

    before do
      stream.set("8901")
    end

    it "overwrite content" do
      stream.seek(0)

      expect(stream.size).to eq(4)
      expect(stream.raw).to eq("8901")
    end
  end

  describe '#raw' do
    let(:path) { __FILE__ }
    let(:lines) { File.readlines(path) }
    let(:stream) do
      described_class.new do
        File.open(path)
      end
    end

    it 'returns all contents if last_lines is not specified' do
      result = stream.raw

      expect(result).to eq(lines.join)
      expect(result.encoding).to eq(Encoding.default_external)
    end

    context 'limit max lines' do
      before do
        # specifying BUFFER_SIZE forces to seek backwards
        allow(described_class).to receive(:BUFFER_SIZE)
          .and_return(2)
      end

      it 'returns last few lines' do
        result = stream.raw(last_lines: 2)

        expect(result).to eq(lines.last(2).join)
        expect(result.encoding).to eq(Encoding.default_external)
      end

      it 'returns everything if trying to get too many lines' do
        result = stream.raw(last_lines: lines.size * 2)

        expect(result).to eq(lines.join)
        expect(result.encoding).to eq(Encoding.default_external)
      end
    end
  end

  describe '#html_with_state' do
    let(:stream) do
      described_class.new do
        StringIO.new("1234")
      end
    end

    it 'returns html content with state' do
      result = stream.html_with_state

      expect(result.html).to eq("1234")
    end

    context 'follow-up state' do
      let!(:last_result) { stream.html_with_state }

      before do
        stream.append("5678", 4)
        stream.seek(0)
      end

      it "returns appended trace" do
        result = stream.html_with_state(last_result.state)

        expect(result.append).to be_truthy
        expect(result.html).to eq("5678")
      end
    end
  end

  describe '#html' do
    let(:stream) do
      described_class.new do
        StringIO.new("12\n34\n56")
      end
    end

    it "returns html" do
      expect(stream.html).to eq("12<br>34<br>56")
    end

    it "returns html for last line only" do
      expect(stream.html(last_lines: 1)).to eq("56")
    end
  end

  describe '#extract_coverage' do
    let(:stream) do
      described_class.new do
        StringIO.new(data)
      end
    end

    subject { stream.extract_coverage(regex) }

    context 'valid content & regex' do
      let(:data) { 'Coverage 1033 / 1051 LOC (98.29%) covered' }
      let(:regex) { '\(\d+.\d+\%\) covered' }

      it { is_expected.to eq("98.29") }
    end

    context 'valid content & bad regex' do
      let(:data) { 'Coverage 1033 / 1051 LOC (98.29%) covered\n' }
      let(:regex) { 'very covered' }

      it { is_expected.to be_nil }
    end

    context 'no coverage content & regex' do
      let(:data) { 'No coverage for today :sad:' }
      let(:regex) { '\(\d+.\d+\%\) covered' }

      it { is_expected.to be_nil }
    end

    context 'multiple results in content & regex' do
      let(:data) do
        <<~HEREDOC
          (98.39%) covered
          (98.29%) covered
        HEREDOC
      end

      let(:regex) { '\(\d+.\d+\%\) covered' }

      it 'returns the last matched coverage' do
        is_expected.to eq("98.29")
      end
    end

    context 'when BUFFER_SIZE is smaller than stream.size' do
      let(:data) { 'Coverage 1033 / 1051 LOC (98.29%) covered\n' }
      let(:regex) { '\(\d+.\d+\%\) covered' }

      before do
        stub_const('Gitlab::Ci::Trace::Stream::BUFFER_SIZE', 5)
      end

      it { is_expected.to eq("98.29") }
    end

    context 'when regex is multi-byte char' do
      let(:data) { '95.0 ゴッドファット\n' }
      let(:regex) { '\d+\.\d+ ゴッドファット' }

      before do
        stub_const('Gitlab::Ci::Trace::Stream::BUFFER_SIZE', 5)
      end

      it { is_expected.to eq('95.0') }
    end

    context 'when BUFFER_SIZE is equal to stream.size' do
      let(:data) { 'Coverage 1033 / 1051 LOC (98.29%) covered\n' }
      let(:regex) { '\(\d+.\d+\%\) covered' }

      before do
        stub_const('Gitlab::Ci::Trace::Stream::BUFFER_SIZE', data.length)
      end

      it { is_expected.to eq("98.29") }
    end

    context 'using a regex capture' do
      let(:data) { 'TOTAL      9926   3489    65%' }
      let(:regex) { 'TOTAL\s+\d+\s+\d+\s+(\d{1,3}\%)' }

      it { is_expected.to eq("65") }
    end

    context 'malicious regexp' do
      let(:data) { malicious_text }
      let(:regex) { malicious_regexp }

      include_examples 'malicious regexp'
    end

    context 'multi-line data with rooted regexp' do
      let(:data) { "\n65%\n" }
      let(:regex) { '^(\d+)\%$' }

      it { is_expected.to eq('65') }
    end

    context 'long line' do
      let(:data) { 'a' * 80000 + '100%' + 'a' * 80000 }
      let(:regex) { '\d+\%' }

      it { is_expected.to eq('100') }
    end

    context 'many lines' do
      let(:data) { "foo\n" * 80000 + "100%\n" + "foo\n" * 80000 }
      let(:regex) { '\d+\%' }

      it { is_expected.to eq('100') }
    end

    context 'empty regex' do
      let(:data) { 'foo' }
      let(:regex) { '' }

      it 'skips processing' do
        expect(stream).not_to receive(:read)

        is_expected.to be_nil
      end
    end

    context 'nil regex' do
      let(:data) { 'foo' }
      let(:regex) { nil }

      it 'skips processing' do
        expect(stream).not_to receive(:read)

        is_expected.to be_nil
      end
    end
  end
end