require_relative '../spec_helper'

describe ZipTricks::Streamer do
  let(:test_text_file_path) {
    File.join(__dir__, 'war-and-peace.txt')
  }

  # Run each test in a temporady directory, and nuke it afterwards
  around(:each) do |example|
    wd = Dir.pwd
    Dir.mktmpdir do | td |
      Dir.chdir(td)
      example.run
    end
    Dir.chdir(wd)
  end

  def rewind_after(*ios)
    yield.tap { ios.map(&:rewind) }
  end

  it 'raises an InvalidOutput if the given object does not support the methods' do
    expect {
      described_class.new(nil)
    }.to raise_error(ZipTricks::Streamer::InvalidOutput)
  end
  
  it 'allows the writer to be injectable' do
    fake_writer = double('ZipWriter')
    expect(fake_writer).to receive(:write_local_file_header)
    expect(fake_writer).to receive(:write_data_descriptor)
    expect(fake_writer).to receive(:write_central_directory_file_header)
    expect(fake_writer).to receive(:write_end_of_central_directory)
    
    described_class.open('', writer: fake_writer) do |zip|
      zip.write_deflated_file('stored.txt') do |sink|
        sink << File.read(__dir__ + '/war-and-peace.txt')
      end
    end
  end
  
  it 'returns the position in the IO at every call' do
    io = StringIO.new
    zip = described_class.new(io)
    pos = zip.add_compressed_entry(filename: 'file.jpg', uncompressed_size: 182919, compressed_size: 8912, crc32: 8912)
    expect(pos).to eq(io.tell)
    expect(pos).to eq(38)

    retval = zip << SecureRandom.random_bytes(8912)
    expect(retval).to eq(zip)
    expect(io.tell).to eq(8950)

    pos = zip.add_stored_entry(filename: 'filf.jpg', size: 8921, crc32: 182919)
    expect(pos).to eq(8988)
    zip << SecureRandom.random_bytes(8921)
    expect(io.tell).to eq(17909)

    pos = zip.close
    expect(pos).to eq(io.tell)
    expect(pos).to eq(18068)
  end

  it 'can write and then read the block-deflated files' do
    f = Tempfile.new('raw')
    f.binmode

    rewind_after(f) do
      f << ('A' * 1024 * 1024)
      f << SecureRandom.random_bytes(1248)
      f << ('B' * 1024 * 1024)
    end

    crc = rewind_after(f) { Zlib.crc32(f.read) }

    compressed_blockwise = StringIO.new
    rewind_after(compressed_blockwise, f) do
      ZipTricks::BlockDeflate.deflate_in_blocks_and_terminate(f, compressed_blockwise, block_size: 1024)
    end

    # Perform the zipping
    zip_file = Tempfile.new('z')
    zip_file.binmode

    described_class.open(zip_file) do |zip|
      zip.add_compressed_entry(filename: "compressed-file.bin", uncompressed_size: f.size,
        crc32: crc, compressed_size: compressed_blockwise.size)
      zip << compressed_blockwise.read
    end
    zip_file.flush

    per_filename = {}
    Zip::File.open(zip_file.path) do |zip_file|
      # Handle entries one by one
      zip_file.each do |entry|
        # The entry name gets returned with a binary encoding, we have to force it back.
        per_filename[entry.name] = entry.get_input_stream.read
      end
    end

    expect(per_filename['compressed-file.bin'].bytesize).to eq(f.size)
    expect(Digest::SHA1.hexdigest(per_filename['compressed-file.bin'])).to eq(Digest::SHA1.hexdigest(f.read))

    inspect_zip_with_external_tool(zip_file.path)
  end

  it 'creates an archive that OSX ArchiveUtility can handle' do
    outbuf = Tempfile.new('zip')
    outbuf.binmode

    zip = ZipTricks::Streamer.new(outbuf)

    File.open(test_text_file_path, 'rb') do | source_f |
      crc32 = rewind_after(source_f) { Zlib.crc32(source_f.read) }

      compressed_buffer = StringIO.new

      expect(ZipTricks::BlockDeflate).to receive(:deflate_chunk).at_least(:twice).and_call_original

      # Compress in blocks of 4 Kb
      rewind_after(source_f, compressed_buffer) do
        ZipTricks::BlockDeflate.deflate_in_blocks_and_terminate(source_f, compressed_buffer, block_size: 1024 * 4)
      end

      # Add this file compressed...
      zip.add_compressed_entry(filename: 'war-and-peace.txt', uncompressed_size: source_f.size,
        crc32: crc32, compressed_size: compressed_buffer.size)
      zip << compressed_buffer.string

      # ...and stored.
      zip.add_stored_entry(filename: 'war-and-peace-raw.txt', size: source_f.size, crc32: crc32)
      zip << source_f.read

      zip.close

      outbuf.flush
      File.unlink('test.zip') rescue nil
      File.rename(outbuf.path, 'osx-archive-test.zip')
      
      # Mark this test as skipped if the system does not have the binary
      open_zip_with_archive_utility('osx-archive-test.zip', skip_if_missing: true)
    end
    FileUtils.rm_rf('osx-archive-test')
    FileUtils.rm_rf('osx-archive-test.zip')
  end

  it 'archives files which can then be read using the usual means with Rubyzip' do
    zip_buf = Tempfile.new('zipp')
    zip_buf.binmode
    output_io = double('IO')

    # Only allow the methods we provide in BlockWrite.
    # Will raise an error if other methods are triggered (the ones that
    # might try to rewind the IO).
    allow(output_io).to receive(:<<) {|data|
      zip_buf << data.to_s.force_encoding(Encoding::BINARY)
    }

    allow(output_io).to receive(:tell) { zip_buf.tell }
    allow(output_io).to receive(:pos) { zip_buf.pos }
    allow(output_io).to receive(:close)

    # Generate a couple of random files
    raw_file_1 = SecureRandom.random_bytes(1024 * 20)
    raw_file_2 = SecureRandom.random_bytes(1024 * 128)

    # Perform the zipping
    zip = described_class.new(output_io)
    zip.add_stored_entry(filename: "first-file.bin", size: raw_file_1.size, crc32: Zlib.crc32(raw_file_1))
    zip << raw_file_1
    zip.add_stored_entry(filename: "second-file.bin", size: raw_file_2.size, crc32: Zlib.crc32(raw_file_2))
    zip << raw_file_2
    zip.close

    zip_buf.flush

    per_filename = {}
    Zip::File.open(zip_buf.path) do |zip_file|
      # Handle entries one by one
      zip_file.each do |entry|
        # The entry name gets returned with a binary encoding, we have to force it back.
        # Somehow an empty string gets read
        per_filename[entry.name] = entry.get_input_stream.read
      end
    end

    expect(per_filename['first-file.bin'].unpack("C*")).to eq(raw_file_1.unpack("C*"))
    expect(per_filename['second-file.bin'].unpack("C*")).to eq(raw_file_2.unpack("C*"))

    wd = Dir.pwd
    Dir.mktmpdir do | td |
      Dir.chdir(td)
      inspect_zip_with_external_tool(zip_buf.path)
    end
    Dir.chdir(wd)
  end

  it 'sets the general-purpose flag for entries with UTF8 names' do
    zip_buf = Tempfile.new('zipp')
    zip_buf.binmode

    # Generate a couple of random files
    raw_file_1 = SecureRandom.random_bytes(1024 * 20)
    raw_file_2 = SecureRandom.random_bytes(1024 * 128)

    # Perform the zipping
    zip = described_class.new(zip_buf)
    zip.add_stored_entry(filename: "first-file.bin", size: raw_file_1.size, crc32: Zlib.crc32(raw_file_1))
    zip << raw_file_1
    zip.add_stored_entry(filename: "второй-файл.bin", size: raw_file_2.size, crc32: Zlib.crc32(raw_file_2))
    IO.copy_stream(StringIO.new(raw_file_2), zip)
    zip.close

    zip_buf.flush

    entries = []
    Zip::File.open(zip_buf.path) do |zip_file|
      # Handle entries one by one
      zip_file.each {|entry| entries << entry }
      first_entry, second_entry = entries

      expect(first_entry.gp_flags).to eq(0)
      expect(first_entry.name).to eq('first-file.bin')

      # Rubyzip does not properly set the encoding of the entries it reads
      expect(second_entry.gp_flags).to eq(2048)
      expect(second_entry.name).to eq("второй-файл.bin".force_encoding(Encoding::BINARY))
    end
  end
  
  it 'creates an archive with data descriptors that can be opened by Rubyzip, with a small number of very tiny text files' do
    tf = ManagedTempfile.new('zip')
    z = described_class.open(tf) do |zip|
      zip.write_stored_file('deflated.txt') do |sink|
        sink << File.read(__dir__ + '/war-and-peace.txt')
      end
      zip.write_deflated_file('stored.txt') do |sink|
        sink << File.read(__dir__ + '/war-and-peace.txt')
      end
    end
    tf.flush
    
    pending 'https://github.com/rubyzip/rubyzip/issues/295'
    
    Zip::File.foreach(tf.path) do |entry|
      # Make sure it is tagged as UNIX
      expect(entry.fstype).to eq(3)

       # The CRC
      expect(entry.crc).to eq(Zlib.crc32(File.read(__dir__ + '/war-and-peace.txt')))

      # Check the name
      expect(entry.name).to match(/\.txt$/)

      # Check the right external attributes (non-executable on UNIX)
      expect(entry.external_file_attributes).to eq(2175008768)
      
      # Check the file contents
      readback = entry.get_input_stream.read
      readback.force_encoding(Encoding::BINARY)
      expect(readback[0..10]).to eq(File.read(__dir__ + '/war-and-peace.txt')[0..10])
    end

    inspect_zip_with_external_tool(tf.path)
  end

  it 'can create a valid ZIP archive without any files' do
    tf = ManagedTempfile.new('zip')
    
    described_class.open(tf) do |zip|
    end

    tf.flush
    tf.rewind

    expect { |b|
      Zip::File.foreach(tf.path, &b)
    }.not_to yield_control
  end
end