# -*- Mode:Python; indent-tabs-mode:nil; tab-width:4 -*-
#
# Copyright (C) 2015-2016 Canonical Ltd
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 3 as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

import copy
import os
from unittest import mock
from testtools.matchers import (
    DirExists,
    FileExists
)

from snapcraft.internal import common
from snapcraft.internal import sources

from snapcraft import tests


class TestLocal(tests.TestCase):

    @mock.patch('snapcraft.internal.sources._local.glob.glob')
    def test_pull_does_not_change_snapcraft_files_list(self, mock_glob):
        # Regression test for https://bugs.launchpad.net/snapcraft/+bug/1614913
        # Verify that SNAPCRAFT_FILES was not modified by the pull when there
        # are files to ignore.
        snapcraft_files_before_pull = copy.copy(common.SNAPCRAFT_FILES)
        mock_glob.return_value = ['a.snap', 'b.snap', 'c.snap']

        local = sources.Local('.', 'destination')
        local.pull()

        self.assertEqual(
            snapcraft_files_before_pull, common.SNAPCRAFT_FILES)

    def test_pull_with_existing_empty_source_dir_creates_hardlinks(self):
        os.makedirs(os.path.join('src', 'dir'))
        open(os.path.join('src', 'dir', 'file'), 'w').close()

        os.mkdir('destination')

        local = sources.Local('src', 'destination')
        local.pull()

        # Verify that the directories are not symlinks, but the file is a
        # hardlink.
        self.assertFalse(os.path.islink('destination'))
        self.assertFalse(os.path.islink(os.path.join('destination', 'dir')))
        self.assertGreater(
            os.stat(os.path.join('destination', 'dir', 'file')).st_nlink, 1)

    def test_pull_with_existing_source_link_creates_symlink(self):
        os.makedirs(os.path.join('src', 'dir'))
        open(os.path.join('src', 'dir', 'file'), 'w').close()

        # Note that this is a symlink now instead of a directory
        os.symlink('dummy', 'destination')

        local = sources.Local('src', 'destination')
        local.pull()

        self.assertFalse(os.path.islink('destination'))
        self.assertFalse(os.path.islink(os.path.join('destination', 'dir')))
        self.assertGreater(
            os.stat(os.path.join('destination', 'dir', 'file')).st_nlink, 1)

    def test_pull_with_existing_source_file_wipes_and_creates_hardlinks(self):
        os.makedirs(os.path.join('src', 'dir'))
        open(os.path.join('src', 'dir', 'file'), 'w').close()

        # Note that this is a file now instead of a directory
        open('destination', 'w').close()

        local = sources.Local('src', 'destination')
        local.pull()

        self.assertFalse(os.path.isfile('destination'))
        self.assertFalse(os.path.islink('destination'))
        self.assertFalse(os.path.islink(os.path.join('destination', 'dir')))
        self.assertGreater(
            os.stat(os.path.join('destination', 'dir', 'file')).st_nlink, 1)

    def test_pulling_twice_with_existing_source_dir_recreates_hardlinks(self):
        os.makedirs(os.path.join('src', 'dir'))
        open(os.path.join('src', 'dir', 'file'), 'w').close()

        os.mkdir('destination')

        local = sources.Local('src', 'destination')
        local.pull()
        local.pull()

        # Verify that the directories are not symlinks, but the file is a
        # hardlink.
        self.assertFalse(os.path.islink('destination'))
        self.assertFalse(os.path.islink(os.path.join('destination', 'dir')))
        self.assertGreater(
            os.stat(os.path.join('destination', 'dir', 'file')).st_nlink, 1)

    def test_pull_ignores_snapcraft_specific_data(self):
        # Make the snapcraft-specific directories
        os.makedirs(os.path.join('src', 'parts'))
        os.makedirs(os.path.join('src', 'stage'))
        os.makedirs(os.path.join('src', 'prime'))

        # Make the snapcraft.yaml (and hidden one) and a built snap
        open(os.path.join('src', 'snapcraft.yaml'), 'w').close()
        open(os.path.join('src', '.snapcraft.yaml'), 'w').close()
        open(os.path.join('src', 'foo.snap'), 'w').close()

        # Now make some real files
        os.makedirs(os.path.join('src', 'dir'))
        open(os.path.join('src', 'dir', 'file'), 'w').close()

        os.mkdir('destination')

        local = sources.Local('src', 'destination')
        local.pull()

        # Verify that the snapcraft-specific stuff got filtered out
        self.assertFalse(os.path.exists(os.path.join('destination', 'parts')))
        self.assertFalse(os.path.exists(os.path.join('destination', 'stage')))
        self.assertFalse(os.path.exists(os.path.join('destination', 'prime')))
        self.assertFalse(
            os.path.exists(os.path.join('destination', 'snapcraft.yaml')))
        self.assertFalse(
            os.path.exists(os.path.join('destination', '.snapcraft.yaml')))
        self.assertFalse(
            os.path.exists(os.path.join('destination', 'foo.snap')))

        # Verify that the real stuff made it in.
        self.assertFalse(os.path.islink('destination'))
        self.assertFalse(os.path.islink(os.path.join('destination', 'dir')))
        self.assertGreater(
            os.stat(os.path.join('destination', 'dir', 'file')).st_nlink, 1)

    def test_pull_keeps_symlinks(self):
        # Create a source containing a directory, a file and symlinks to both.
        os.makedirs(os.path.join('src', 'dir'))
        open(os.path.join('src', 'dir', 'file'), 'w').close()
        os.symlink('dir', os.path.join('src', 'dir_symlink'))
        os.symlink('file', os.path.join('src', 'dir', 'file_symlink'))

        local = sources.Local('src', 'destination')
        local.pull()

        # Verify that both the file and the directory symlinks were kept.
        self.expectThat(os.path.join('destination', 'dir'), DirExists())
        self.expectThat(
            os.path.join('destination', 'dir_symlink'),
            tests.LinkExists('dir'))
        self.expectThat(
            os.path.join('destination', 'dir', 'file'), FileExists())
        self.expectThat(
            os.path.join('destination', 'dir', 'file_symlink'),
            tests.LinkExists('file'))


class TestLocalIgnores(tests.TestCase):
    """Verify that the snapcraft root dir does not get copied into itself."""

    scenarios = [(f, dict(snapcraft_dir=f))
                 for f in common.SNAPCRAFT_FILES if '.' not in f]

    def test_pull_with_source_the_parent_of_current_dir(self):
        os.makedirs('subdir')

        cwd = os.getcwd()
        os.chdir('subdir')
        source_dir = os.path.join(self.snapcraft_dir, 'foo_src')
        local = sources.Local('..', source_dir)
        local.pull()
        os.chdir(cwd)
        self.assertFalse(
            os.path.exists(os.path.join(
                'subdir', source_dir, 'subdir', self.snapcraft_dir)))
        self.assertTrue(
            'subdir' in os.listdir(os.path.join('subdir', source_dir)))

    def test_pull_with_source_a_parent_of_current_dir(self):
        subdir = os.path.join('subdir', 'subsubdir', 'subsubsubdir')
        os.makedirs(subdir)

        cwd = os.getcwd()
        os.chdir(subdir)
        source = '../' * (subdir.count(os.sep)+1)
        source_dir = os.path.join(self.snapcraft_dir, 'foo_src')
        local = sources.Local(source, source_dir)
        local.pull()
        os.chdir(cwd)
        self.assertFalse(
            os.path.exists(os.path.join(
                subdir, source_dir, subdir, self.snapcraft_dir)))
        self.assertTrue(
            os.path.basename(subdir) in os.listdir(
                os.path.join(subdir, source_dir, os.path.dirname(subdir))))
