import os
import stat
import time

from dvc.system import System
from dvc.state import State
from dvc.utils import file_md5

from tests.basic_env import TestDvc


class TestState(TestDvc):
    def test_update(self):
        path = os.path.join(self.dvc.root_dir, self.FOO)
        md5 = file_md5(path)[0]
        mtime = os.path.getmtime(path)
        inode = System.inode(path)

        state = State(self.dvc)

        entry_md5 = state.update(path)
        self.assertEqual(entry_md5, md5)

        # Sleep some time to simulate realistic behavior.
        # Some filesystems have a bad date resolution for
        # mtime(i.e. 1sec for HFS) that cause problems with
        # our 'state' system not being able to distinguish
        # files that were modified within that delta.
        time.sleep(1)        

        os.unlink(path)
        with open(path, 'w+') as fd:
            fd.write('1')

        md5 = file_md5(path)[0]
        mtime = os.path.getmtime(path)
        inode = System.inode(path)

        entry_md5 = state.update(path)
        self.assertEqual(entry_md5, md5)