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"""Tests for third_party.nucleus.io.gfile."""

from __future__ import absolute_import
from __future__ import division
from __future__ import print_function

from absl.testing import absltest

from third_party.nucleus.io import gfile
from third_party.nucleus.testing import test_utils


class GfileTest(absltest.TestCase):

  def test_exists(self):
    self.assertTrue(gfile.Exists(
        test_utils.genomics_core_testdata('test_regions.bedgraph')))
    self.assertFalse(gfile.Exists(
        test_utils.genomics_core_testdata('does_not_exist')))

  def test_glob(self):
    g1 = gfile.Glob(test_utils.genomics_core_testdata('test*'))
    self.assertGreater(len(g1), 1)
    self.assertIn(
        test_utils.genomics_core_testdata('test.bam'), g1)
    g2 = gfile.Glob(test_utils.genomics_core_testdata('does_not_exist*'))
    self.assertEqual([], g2)

  def test_reading(self):
    with gfile.Open(test_utils.genomics_core_testdata('headerless.sam')) as f:
      for line in f:
        self.assertTrue(line.startswith('SRR3656745'))

  def test_writing(self):
    path = test_utils.test_tmpfile('test_gfile')
    with gfile.Open(path, 'w') as f:
      f.write('test\n')
      f.write('end\n')

    with gfile.Open(path, 'r') as f2:
      lines = f2.readlines()

    self.assertEqual(['test\n', 'end\n'], lines)


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