"""Test certbot.reverter."""
import csv
import logging
import shutil
import sys
import tempfile
import unittest
from unittest import mock

import pytest

from certbot import errors
from certbot.compat import os
from certbot.tests import util as test_util


class ReverterCheckpointLocalTest(test_util.ConfigTestCase):
    """Test the Reverter Class."""
    def setUp(self):
        super().setUp()
        from certbot.reverter import Reverter

        # Disable spurious errors... we are trying to test for them
        logging.disable(logging.CRITICAL)

        self.reverter = Reverter(self.config)

        tup = setup_test_files()
        self.config1, self.config2, self.dir1, self.dir2, self.sets = tup

    def tearDown(self):
        shutil.rmtree(self.config.work_dir)
        shutil.rmtree(self.dir1)
        shutil.rmtree(self.dir2)

        logging.disable(logging.NOTSET)

    @mock.patch("certbot.reverter.Reverter._read_and_append")
    def test_no_change(self, mock_read):
        mock_read.side_effect = OSError("cannot even")
        try:
            self.reverter.add_to_checkpoint(self.sets[0], "save1")
        except OSError:
            pass
        self.reverter.finalize_checkpoint("blah")
        path = os.listdir(self.reverter.config.backup_dir)[0]
        no_change = os.path.join(self.reverter.config.backup_dir, path, "CHANGES_SINCE")
        with open(no_change, "r") as f:
            x = f.read()
        assert "No changes" in x

    def test_basic_add_to_temp_checkpoint(self):
        # These shouldn't conflict even though they are both named config.txt
        self.reverter.add_to_temp_checkpoint(self.sets[0], "save1")
        self.reverter.add_to_temp_checkpoint(self.sets[1], "save2")

        assert os.path.isdir(self.config.temp_checkpoint_dir)
        assert get_save_notes(
            self.config.temp_checkpoint_dir) == "save1save2"
        assert not os.path.isfile(
            os.path.join(self.config.temp_checkpoint_dir, "NEW_FILES"))

        assert get_filepaths(self.config.temp_checkpoint_dir) == \
            "{0}\n{1}\n".format(self.config1, self.config2)

    def test_add_to_checkpoint_copy_failure(self):
        with mock.patch("certbot.reverter.shutil.copy2") as mock_copy2:
            mock_copy2.side_effect = OSError("bad copy")
            with pytest.raises(errors.ReverterError):
                self.reverter.add_to_checkpoint(self.sets[0], "save1")

    def test_checkpoint_conflict(self):
        """Make sure that checkpoint errors are thrown appropriately."""
        config3 = os.path.join(self.dir1, "config3.txt")
        self.reverter.register_file_creation(True, config3)
        update_file(config3, "This is a new file!")

        self.reverter.add_to_checkpoint(self.sets[2], "save1")
        # This shouldn't throw an error
        self.reverter.add_to_temp_checkpoint(self.sets[0], "save2")
        # Raise error
        with pytest.raises(errors.ReverterError):
            self.reverter.add_to_checkpoint(self.sets[2], "save3")
        # Should not cause an error
        self.reverter.add_to_checkpoint(self.sets[1], "save4")

        # Check to make sure new files are also checked...
        with pytest.raises(errors.ReverterError):
            self.reverter.add_to_checkpoint({config3}, "invalid save")

    def test_multiple_saves_and_temp_revert(self):
        self.reverter.add_to_temp_checkpoint(self.sets[0], "save1")
        update_file(self.config1, "updated-directive")
        self.reverter.add_to_temp_checkpoint(self.sets[0], "save2-updated dir")
        update_file(self.config1, "new directive change that we won't keep")

        self.reverter.revert_temporary_config()
        assert read_in(self.config1) == "directive-dir1"

    def test_multiple_registration_fail_and_revert(self):

        config3 = os.path.join(self.dir1, "config3.txt")
        update_file(config3, "Config3")
        config4 = os.path.join(self.dir2, "config4.txt")
        update_file(config4, "Config4")

        # Test multiple registrations and two registrations at once
        self.reverter.register_file_creation(True, self.config1)
        self.reverter.register_file_creation(True, self.config2)
        self.reverter.register_file_creation(True, config3, config4)

        # Simulate Certbot crash... recovery routine is run
        self.reverter.recovery_routine()

        assert not os.path.isfile(self.config1)
        assert not os.path.isfile(self.config2)
        assert not os.path.isfile(config3)
        assert not os.path.isfile(config4)

    def test_multiple_registration_same_file(self):
        self.reverter.register_file_creation(True, self.config1)
        self.reverter.register_file_creation(True, self.config1)
        self.reverter.register_file_creation(True, self.config1)
        self.reverter.register_file_creation(True, self.config1)

        files = get_new_files(self.config.temp_checkpoint_dir)

        assert len(files) == 1

    def test_register_file_creation_write_error(self):
        m_open = mock.mock_open()
        with mock.patch("certbot.reverter.open", m_open, create=True):
            m_open.side_effect = OSError("bad open")
            with pytest.raises(errors.ReverterError):
                self.reverter.register_file_creation(True, self.config1)

    def test_bad_registration(self):
        # Made this mistake and want to make sure it doesn't happen again...
        with pytest.raises(errors.ReverterError):
            self.reverter.register_file_creation("filepath")

    def test_register_undo_command(self):
        coms = [
            ["a2dismod", "ssl"],
            ["a2dismod", "rewrite"],
            ["cleanslate"]
        ]
        for com in coms:
            self.reverter.register_undo_command(True, com)

        act_coms = get_undo_commands(self.config.temp_checkpoint_dir)

        for a_com, com in zip(act_coms, coms):
            assert a_com == com

    def test_bad_register_undo_command(self):
        m_open = mock.mock_open()
        with mock.patch("certbot.reverter.open", m_open, create=True):
            m_open.side_effect = OSError("bad open")
            with pytest.raises(errors.ReverterError):
                self.reverter.register_undo_command(True, ["command"])

    @mock.patch("certbot.util.run_script")
    def test_run_undo_commands(self, mock_run):
        mock_run.side_effect = ["", errors.SubprocessError]
        coms = [
            ["invalid_command"],
            ["a2dismod", "ssl"],
        ]
        for com in coms:
            self.reverter.register_undo_command(True, com)

        self.reverter.revert_temporary_config()

        assert mock_run.call_count == 2

    def test_recovery_routine_in_progress_failure(self):
        self.reverter.add_to_checkpoint(self.sets[0], "perm save")

        # pylint: disable=protected-access
        self.reverter._recover_checkpoint = mock.MagicMock(
            side_effect=errors.ReverterError)
        with pytest.raises(errors.ReverterError):
            self.reverter.recovery_routine()

    def test_recover_checkpoint_revert_temp_failures(self):

        mock_recover = mock.MagicMock(
            side_effect=errors.ReverterError("e"))

        # pylint: disable=protected-access
        self.reverter._recover_checkpoint = mock_recover

        self.reverter.add_to_temp_checkpoint(self.sets[0], "config1 save")

        with pytest.raises(errors.ReverterError):
            self.reverter.revert_temporary_config()

    def test_recover_checkpoint_rollback_failure(self):
        mock_recover = mock.MagicMock(
            side_effect=errors.ReverterError("e"))
        # pylint: disable=protected-access
        self.reverter._recover_checkpoint = mock_recover

        self.reverter.add_to_checkpoint(self.sets[0], "config1 save")
        self.reverter.finalize_checkpoint("Title")

        with pytest.raises(errors.ReverterError):
            self.reverter.rollback_checkpoints(1)

    def test_recover_checkpoint_copy_failure(self):
        self.reverter.add_to_temp_checkpoint(self.sets[0], "save1")

        with mock.patch("certbot.reverter.shutil.copy2") as mock_copy2:
            mock_copy2.side_effect = OSError("bad copy")
            with pytest.raises(errors.ReverterError):
                self.reverter.revert_temporary_config()

    def test_recover_checkpoint_rm_failure(self):
        self.reverter.add_to_temp_checkpoint(self.sets[0], "temp save")

        with mock.patch("certbot.reverter.shutil.rmtree") as mock_rmtree:
            mock_rmtree.side_effect = OSError("Cannot remove tree")
            with pytest.raises(errors.ReverterError):
                self.reverter.revert_temporary_config()

    @mock.patch("certbot.reverter.logger.warning")
    def test_recover_checkpoint_missing_new_files(self, mock_warn):
        self.reverter.register_file_creation(
            True, os.path.join(self.dir1, "missing_file.txt"))
        self.reverter.revert_temporary_config()
        assert mock_warn.call_count == 1

    @mock.patch("certbot.reverter.os.remove")
    def test_recover_checkpoint_remove_failure(self, mock_remove):
        self.reverter.register_file_creation(True, self.config1)
        mock_remove.side_effect = OSError("Can't remove")
        with pytest.raises(errors.ReverterError):
            self.reverter.revert_temporary_config()

    def test_recovery_routine_temp_and_perm(self):
        # Register a new perm checkpoint file
        config3 = os.path.join(self.dir1, "config3.txt")
        self.reverter.register_file_creation(False, config3)
        update_file(config3, "This is a new perm file!")

        # Add changes to perm checkpoint
        self.reverter.add_to_checkpoint(self.sets[0], "perm save1")
        update_file(self.config1, "updated perm config1")
        self.reverter.add_to_checkpoint(self.sets[1], "perm save2")
        update_file(self.config2, "updated perm config2")

        # Add changes to a temporary checkpoint
        self.reverter.add_to_temp_checkpoint(self.sets[0], "temp save1")
        update_file(self.config1, "second update now temp config1")

        # Register a new temp checkpoint file
        config4 = os.path.join(self.dir2, "config4.txt")
        self.reverter.register_file_creation(True, config4)
        update_file(config4, "New temporary file!")

        # Now erase everything
        self.reverter.recovery_routine()

        # Now Run tests
        # These were new files.. they should be removed
        assert not os.path.isfile(config3)
        assert not os.path.isfile(config4)

        # Check to make sure everything got rolled back appropriately
        assert read_in(self.config1) == "directive-dir1"
        assert read_in(self.config2) == "directive-dir2"


class TestFullCheckpointsReverter(test_util.ConfigTestCase):
    """Tests functions having to deal with full checkpoints."""
    def setUp(self):
        super().setUp()
        from certbot.reverter import Reverter

        # Disable spurious errors...
        logging.disable(logging.CRITICAL)

        self.reverter = Reverter(self.config)

        tup = setup_test_files()
        self.config1, self.config2, self.dir1, self.dir2, self.sets = tup

    def tearDown(self):
        shutil.rmtree(self.config.work_dir)
        shutil.rmtree(self.dir1)
        shutil.rmtree(self.dir2)

        logging.disable(logging.NOTSET)

    def test_rollback_improper_inputs(self):
        with pytest.raises(errors.ReverterError):
            self.reverter.rollback_checkpoints("-1")
        with pytest.raises(errors.ReverterError):
            self.reverter.rollback_checkpoints(-1000)
        with pytest.raises(errors.ReverterError):
            self.reverter.rollback_checkpoints("one")

    def test_rollback_finalize_checkpoint_valid_inputs(self):

        config3 = self._setup_three_checkpoints()

        # Check resulting backup directory
        assert len(os.listdir(self.config.backup_dir)) == 3
        # Check rollbacks
        # First rollback
        self.reverter.rollback_checkpoints(1)
        assert read_in(self.config1) == "update config1"
        assert read_in(self.config2) == "update config2"
        # config3 was not included in checkpoint
        assert read_in(config3) == "Final form config3"

        # Second rollback
        self.reverter.rollback_checkpoints(1)
        assert read_in(self.config1) == "update config1"
        assert read_in(self.config2) == "directive-dir2"
        assert not os.path.isfile(config3)

        # One dir left... check title
        all_dirs = os.listdir(self.config.backup_dir)
        assert len(all_dirs) == 1
        assert "First Checkpoint" in get_save_notes(
                os.path.join(self.config.backup_dir, all_dirs[0]))
        # Final rollback
        self.reverter.rollback_checkpoints(1)
        assert read_in(self.config1) == "directive-dir1"

    def test_finalize_checkpoint_no_in_progress(self):
        # No need to warn for this... just make sure there are no errors.
        self.reverter.finalize_checkpoint("No checkpoint...")

    @mock.patch("certbot.reverter.shutil.move")
    def test_finalize_checkpoint_cannot_title(self, mock_move):
        self.reverter.add_to_checkpoint(self.sets[0], "perm save")
        mock_move.side_effect = OSError("cannot move")

        with pytest.raises(errors.ReverterError):
            self.reverter.finalize_checkpoint("Title")

    @mock.patch("certbot.reverter.filesystem.replace")
    def test_finalize_checkpoint_no_rename_directory(self, mock_replace):

        self.reverter.add_to_checkpoint(self.sets[0], "perm save")
        mock_replace.side_effect = OSError

        with pytest.raises(errors.ReverterError):
            self.reverter.finalize_checkpoint("Title")

    @mock.patch("certbot.reverter.logger")
    def test_rollback_too_many(self, mock_logger):
        # Test no exist warning...
        self.reverter.rollback_checkpoints(1)
        assert mock_logger.warning.call_count == 1

        # Test Generic warning
        self._setup_three_checkpoints()
        mock_logger.warning.call_count = 0
        self.reverter.rollback_checkpoints(4)
        assert mock_logger.warning.call_count == 1

    def test_multi_rollback(self):
        config3 = self._setup_three_checkpoints()
        self.reverter.rollback_checkpoints(3)

        assert read_in(self.config1) == "directive-dir1"
        assert read_in(self.config2) == "directive-dir2"
        assert not os.path.isfile(config3)

    def _setup_three_checkpoints(self):
        """Generate some finalized checkpoints."""
        # Checkpoint1 - config1
        self.reverter.add_to_checkpoint(self.sets[0], "first save")
        self.reverter.finalize_checkpoint("First Checkpoint")

        update_file(self.config1, "update config1")

        # Checkpoint2 - new file config3, update config2
        config3 = os.path.join(self.dir1, "config3.txt")
        self.reverter.register_file_creation(False, config3)
        update_file(config3, "directive-config3")
        self.reverter.add_to_checkpoint(self.sets[1], "second save")
        self.reverter.finalize_checkpoint("Second Checkpoint")

        update_file(self.config2, "update config2")
        update_file(config3, "update config3")

        # Checkpoint3 - update config1, config2
        self.reverter.add_to_checkpoint(self.sets[2], "third save")
        self.reverter.finalize_checkpoint("Third Checkpoint - Save both")

        update_file(self.config1, "Final form config1")
        update_file(self.config2, "Final form config2")
        update_file(config3, "Final form config3")

        return config3


def setup_test_files():
    """Setup sample configuration files."""
    dir1 = tempfile.mkdtemp("dir1")
    dir2 = tempfile.mkdtemp("dir2")
    config1 = os.path.join(dir1, "config.txt")
    config2 = os.path.join(dir2, "config.txt")
    with open(config1, "w") as file_fd:
        file_fd.write("directive-dir1")
    with open(config2, "w") as file_fd:
        file_fd.write("directive-dir2")

    sets = [{config1},
            {config2},
            {config1, config2}]

    return config1, config2, dir1, dir2, sets


def get_save_notes(dire):
    """Read save notes"""
    return read_in(os.path.join(dire, "CHANGES_SINCE"))


def get_filepaths(dire):
    """Get Filepaths"""
    return read_in(os.path.join(dire, "FILEPATHS"))


def get_new_files(dire):
    """Get new files."""
    return read_in(os.path.join(dire, "NEW_FILES")).splitlines()


def get_undo_commands(dire):
    """Get new files."""
    with open(os.path.join(dire, "COMMANDS")) as csvfile:
        return list(csv.reader(csvfile))


def read_in(path):
    """Read in a file, return the str"""
    with open(path, "r") as file_fd:
        return file_fd.read()


def update_file(filename, string):
    """Update a file with a new value."""
    with open(filename, "w") as file_fd:
        file_fd.write(string)


if __name__ == "__main__":
    sys.exit(pytest.main(sys.argv[1:] + [__file__]))  # pragma: no cover
