# Copyright 2016 The Brotli Authors. All rights reserved.
#
# Distributed under MIT license.
# See file LICENSE for detail or copy at https://opensource.org/licenses/MIT

import functools
import unittest

import brotli

from . import _test_utils


# Do not inherit from TestCase here to ensure that test methods
# are not run automatically and instead are run as part of a specific
# configuration below.
class _TestCompressor(object):

  CHUNK_SIZE = 2048

  def tearDown(self):
    self.compressor = None
    super().tearDown()

  def _check_decompression(self, test_data):
    # Write decompression to temp file and verify it matches the original.
    temp_uncompressed = _test_utils.get_temp_uncompressed_name(test_data)
    temp_compressed = _test_utils.get_temp_compressed_name(test_data)
    original = test_data
    with open(temp_uncompressed, 'wb') as out_file:
      with open(temp_compressed, 'rb') as in_file:
        out_file.write(brotli.decompress(in_file.read()))
    self.assert_files_match(temp_uncompressed, original)

  def _test_single_process(self, test_data):
    # Write single-shot compression to temp file.
    temp_compressed = _test_utils.get_temp_compressed_name(test_data)
    with open(temp_compressed, 'wb') as out_file:
      with open(test_data, 'rb') as in_file:
        out_file.write(self.compressor.process(in_file.read()))
      out_file.write(self.compressor.finish())
    self._check_decompression(test_data)

  def _test_multiple_process(self, test_data):
    # Write chunked compression to temp file.
    temp_compressed = _test_utils.get_temp_compressed_name(test_data)
    with open(temp_compressed, 'wb') as out_file:
      with open(test_data, 'rb') as in_file:
        read_chunk = functools.partial(in_file.read, self.CHUNK_SIZE)
        for data in iter(read_chunk, b''):
          out_file.write(self.compressor.process(data))
      out_file.write(self.compressor.finish())
    self._check_decompression(test_data)

  def _test_multiple_process_and_flush(self, test_data):
    # Write chunked and flushed compression to temp file.
    temp_compressed = _test_utils.get_temp_compressed_name(test_data)
    with open(temp_compressed, 'wb') as out_file:
      with open(test_data, 'rb') as in_file:
        read_chunk = functools.partial(in_file.read, self.CHUNK_SIZE)
        for data in iter(read_chunk, b''):
          out_file.write(self.compressor.process(data))
          out_file.write(self.compressor.flush())
      out_file.write(self.compressor.finish())
    self._check_decompression(test_data)


_test_utils.generate_test_methods(_TestCompressor)


class TestCompressorQuality1(_TestCompressor, _test_utils.TestCase):

  def setUp(self):
    super().setUp()
    self.compressor = brotli.Compressor(quality=1)


class TestCompressorQuality6(_TestCompressor, _test_utils.TestCase):

  def setUp(self):
    super().setUp()
    self.compressor = brotli.Compressor(quality=6)


class TestCompressorQuality9(_TestCompressor, _test_utils.TestCase):

  def setUp(self):
    super().setUp()
    self.compressor = brotli.Compressor(quality=9)


class TestCompressorQuality11(_TestCompressor, _test_utils.TestCase):

  def setUp(self):
    super().setUp()
    self.compressor = brotli.Compressor(quality=11)


if __name__ == '__main__':
  unittest.main()