# -*- coding: utf-8 -*-
from __future__ import absolute_import, division, print_function, unicode_literals
from logging import getLogger
import os
from os.path import join, isdir, lexists, isfile, exists
from tempfile import gettempdir
from unittest import TestCase
import uuid

import pytest

from conda.common.compat import on_win, PY2
from conda.gateways.disk.create import mkdir_p
from conda.gateways.disk.delete import rm_rf
from conda.gateways.disk.link import link, islink, readlink, stat_nlink, symlink
from conda.gateways.disk.test import softlink_supported
from conda.gateways.disk.update import touch

log = getLogger(__name__)


class LinkSymlinkUnlinkIslinkReadlinkTests(TestCase):

    def setUp(self):
        tempdirdir = gettempdir()
        dirname = str(uuid.uuid4())[:8]
        self.test_dir = join(tempdirdir, dirname)
        mkdir_p(self.test_dir)
        assert isdir(self.test_dir)

    def tearDown(self):
        rm_rf(self.test_dir)
        assert not lexists(self.test_dir)

    def test_hard_link(self):
        path1_real_file = join(self.test_dir, 'path1_real_file')
        path2_second_inode = join(self.test_dir, 'path2_second_inode')
        touch(path1_real_file)
        assert isfile(path1_real_file)
        assert not islink(path1_real_file)
        link(path1_real_file, path2_second_inode)
        assert isfile(path2_second_inode)
        assert not islink(path2_second_inode)

        path1_stat = os.stat(path1_real_file)
        path2_stat = os.stat(path2_second_inode)

        assert path1_stat.st_ino == path2_stat.st_ino
        assert stat_nlink(path1_real_file) == stat_nlink(path2_second_inode)

        os.unlink(path2_second_inode)
        assert not lexists(path2_second_inode)
        assert stat_nlink(path1_real_file) == 1

        os.unlink(path1_real_file)
        assert not lexists(path1_real_file)

    def test_soft_link(self):
        path1_real_file = join(self.test_dir, 'path1_real_file')
        path2_symlink = join(self.test_dir, 'path2_symlink')
        touch(path1_real_file)
        assert isfile(path1_real_file)
        assert not islink(path1_real_file)

        if not softlink_supported(path1_real_file, self.test_dir) and on_win:
            pytest.skip("softlink not supported")


        symlink(path1_real_file, path2_symlink)
        assert exists(path2_symlink)
        assert lexists(path2_symlink)
        assert islink(path2_symlink)

        assert readlink(path2_symlink).endswith(path1_real_file)
        # for win py27, readlink actually gives something that starts with \??\
        # \??\c:\users\appveyor\appdata\local\temp\1\c571cb0c\path1_real_file

        assert stat_nlink(path1_real_file) == stat_nlink(path2_symlink) == 1

        os.unlink(path1_real_file)
        assert not isfile(path1_real_file)
        assert not lexists(path1_real_file)
        assert not exists(path1_real_file)

        assert lexists(path2_symlink)
        if not (on_win and PY2):
            # I guess I'm not surprised this exist vs lexist is different for win py2
            #   consider adding a fix in the future
            assert not exists(path2_symlink)

        os.unlink(path2_symlink)
        assert not lexists(path2_symlink)
        assert not exists(path2_symlink)