import os.path
import unittest
from StringIO import StringIO

from sos.utilities import grep, DirTree, checksum, get_hash_name, is_executable, sosGetCommandOutput, find, tail
import sos

TEST_DIR = os.path.dirname(__file__)

class GrepTest(unittest.TestCase):

    def test_file_obj(self):
        test_s = "\n".join(['this is only a test', 'there are only two lines'])
        test_fo = StringIO(test_s)
        matches = grep(".*test$", test_fo)
        self.assertEquals(matches, ['this is only a test\n'])

    def test_real_file(self):
        matches = grep(".*unittest$", __file__.replace(".pyc", ".py"))
        self.assertEquals(matches, ['import unittest\n'])

    def test_open_file(self):
        matches = grep(".*unittest$", open(__file__.replace(".pyc", ".py")))
        self.assertEquals(matches, ['import unittest\n'])

    def test_grep_multiple_files(self):
        matches = grep(".*unittest$", __file__.replace(".pyc", ".py"), "does_not_exist.txt")
        self.assertEquals(matches, ['import unittest\n'])


class TailTest(unittest.TestCase):

    def test_tail(self):
        t = tail("tests/tail_test.txt", 10)
        self.assertEquals(t, "last line\n")

    def test_tail_too_many(self):
        t = tail("tests/tail_test.txt", 200)
        expected = open("tests/tail_test.txt", "r").read()
        self.assertEquals(t, expected)


class DirTreeTest(unittest.TestCase):

    def test_makes_tree(self):
        # I'll admit, this a pretty lame test, but it will at least sniff out
        # some syntax issues
        t = DirTree(os.path.dirname(sos.__file__)).as_string()
        self.assertTrue('Makefile' in t)


class ChecksumTest(unittest.TestCase):

    def test_simple_hash(self):
        self.assertEquals(checksum(StringIO('this is a test'), algorithm="sha256"),
                '2e99758548972a8e8822ad47fa1017ff72f06f3ff6a016851f45c398732bc50c')

    def test_hash_loading(self):
       # not the greatest test, since we are asking the policy to pick for us
       name = get_hash_name()
       self.assertTrue(name in ('md5', 'sha256'))


class ExecutableTest(unittest.TestCase):

    def test_nonexe_file(self):
        path = os.path.join(TEST_DIR, 'utility_tests.py')
        self.assertFalse(is_executable(path))

    def test_exe_file(self):
        path = os.path.join(TEST_DIR, 'test_exe.py')
        self.assertTrue(is_executable(path))

    def test_output(self):
        path = os.path.join(TEST_DIR, 'test_exe.py')
        ret, out, junk = sosGetCommandOutput(path)
        self.assertEquals(ret, 0)
        self.assertEquals(out, "executed")

    def test_output_non_exe(self):
        path = os.path.join(TEST_DIR, 'utility_tests.py')
        ret, out, junk = sosGetCommandOutput(path)
        self.assertEquals(ret, 127)
        self.assertEquals(out, "")


class FindTest(unittest.TestCase):

    def test_find_leaf(self):
        leaves = find("leaf", TEST_DIR)
        self.assertTrue(any(name.endswith("leaf") for name in leaves))

    def test_too_shallow(self):
        leaves = find("leaf", TEST_DIR, max_depth=1)
        self.assertFalse(any(name.endswith("leaf") for name in leaves))

    def test_not_in_pattern(self):
        leaves = find("leaf", TEST_DIR, path_pattern="tests/path")
        self.assertFalse(any(name.endswith("leaf") for name in leaves))