# 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 subprocess
import unittest

from . import _test_utils

BRO_ARGS = _test_utils.BRO_ARGS
TEST_ENV = _test_utils.TEST_ENV


def _get_original_name(test_data):
  return test_data.split('.compressed')[0]


class TestBroDecompress(_test_utils.TestCase):

  def _check_decompression(self, test_data):
    # Verify decompression matches the original.
    temp_uncompressed = _test_utils.get_temp_uncompressed_name(test_data)
    original = _get_original_name(test_data)
    self.assert_files_match(temp_uncompressed, original)

  def _decompress_file(self, test_data):
    temp_uncompressed = _test_utils.get_temp_uncompressed_name(test_data)
    args = BRO_ARGS + ['-f', '-d', '-i', test_data, '-o', temp_uncompressed]
    subprocess.check_call(args, env=TEST_ENV)

  def _decompress_pipe(self, test_data):
    temp_uncompressed = _test_utils.get_temp_uncompressed_name(test_data)
    args = BRO_ARGS + ['-d']
    with open(temp_uncompressed, 'wb') as out_file:
      with open(test_data, 'rb') as in_file:
        subprocess.check_call(
            args, stdin=in_file, stdout=out_file, env=TEST_ENV
        )

  def _test_decompress_file(self, test_data):
    self._decompress_file(test_data)
    self._check_decompression(test_data)

  def _test_decompress_pipe(self, test_data):
    self._decompress_pipe(test_data)
    self._check_decompression(test_data)


_test_utils.generate_test_methods(TestBroDecompress, for_decompression=True)


class TestBroCompress(_test_utils.TestCase):

  VARIANTS = {'quality': (1, 6, 9, 11), 'lgwin': (10, 15, 20, 24)}

  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
    args = BRO_ARGS + ['-f', '-d']
    args.extend(['-i', temp_compressed, '-o', temp_uncompressed])
    subprocess.check_call(args, env=TEST_ENV)
    self.assert_files_match(temp_uncompressed, original)

  def _compress_file(self, test_data, **kwargs):
    temp_compressed = _test_utils.get_temp_compressed_name(test_data)
    args = BRO_ARGS + ['-f']
    if 'quality' in kwargs:
      args.extend(['-q', str(kwargs['quality'])])
    if 'lgwin' in kwargs:
      args.extend(['--lgwin', str(kwargs['lgwin'])])
    args.extend(['-i', test_data, '-o', temp_compressed])
    subprocess.check_call(args, env=TEST_ENV)

  def _compress_pipe(self, test_data, **kwargs):
    temp_compressed = _test_utils.get_temp_compressed_name(test_data)
    args = BRO_ARGS
    if 'quality' in kwargs:
      args.extend(['-q', str(kwargs['quality'])])
    if 'lgwin' in kwargs:
      args.extend(['--lgwin', str(kwargs['lgwin'])])
    with open(temp_compressed, 'wb') as out_file:
      with open(test_data, 'rb') as in_file:
        subprocess.check_call(
            args, stdin=in_file, stdout=out_file, env=TEST_ENV
        )

  def _test_compress_file(self, test_data, **kwargs):
    self._compress_file(test_data, **kwargs)
    self._check_decompression(test_data)

  def _test_compress_pipe(self, test_data, **kwargs):
    self._compress_pipe(test_data, **kwargs)
    self._check_decompression(test_data)


_test_utils.generate_test_methods(
    TestBroCompress, variants=TestBroCompress.VARIANTS
)

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