# Copyright (C) 2019-2022 Benjamin Drung <bdrung@posteo.de>
#
# Permission to use, copy, modify, and/or distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

"""Test configuration handling of bdebstrap."""

import contextlib
import io
import logging
import os
import tempfile
import unittest
import unittest.mock

from bdebstrap import HOOKS_DIR, Config, dict_merge, parse_args

EXAMPLE_CONFIG_DIR = os.path.join(os.path.dirname(__file__), "..", "examples")
TEST_CONFIG_DIR = os.path.join(os.path.dirname(__file__), "configs")


def get_subset(dict_, keys):
    """Return a dictionary that only contains the items for the given keys."""
    return {key: value for key, value in dict_.items() if key in keys}


class TestArguments(unittest.TestCase):
    """
    This unittest class tests the argument parsing.
    """

    maxDiff = None

    def test_debug(self):
        """Test --debug argument parsing."""
        args = parse_args(["--debug"])
        self.assertEqual(args.log_level, logging.DEBUG)

    def test_empty_args(self):
        """Test setting arguments to empty strings."""
        args = parse_args(
            [
                "--aptopt=",
                "--architectures=",
                "--cleanup-hook=",
                "--components=",
                "--config=",
                "--customize-hook=",
                "--dpkgopt=",
                "--essential-hook=",
                "--keyring=",
                "--mirrors=",
                "--packages=",
                "--setup-hook=",
            ]
        )
        self.assertEqual(
            get_subset(
                args.__dict__,
                {
                    "aptopt",
                    "architectures",
                    "cleanup_hook",
                    "components",
                    "config",
                    "customize_hook",
                    "dpkgopt",
                    "essential_hook",
                    "keyring",
                    "mirrors",
                    "packages",
                    "setup_hook",
                },
            ),
            {
                "aptopt": [],
                "architectures": [],
                "cleanup_hook": [],
                "components": [],
                "config": [],
                "customize_hook": [],
                "dpkgopt": [],
                "essential_hook": [],
                "keyring": [],
                "mirrors": [],
                "packages": [],
                "setup_hook": [],
            },
        )

    def test_no_args(self):
        """Test calling bdebstrap without arguments."""
        args = parse_args([])
        self.assertEqual(
            args.__dict__,
            {
                "aptopt": None,
                "architectures": None,
                "cleanup_hook": None,
                "components": None,
                "config": [],
                "customize_hook": None,
                "dpkgopt": None,
                "env": {},
                "essential_hook": None,
                "force": False,
                "hostname": None,
                "install_recommends": False,
                "keyring": None,
                "log_level": logging.WARNING,
                "mirrors": [],
                "mode": None,
                "name": None,
                "output_base_dir": ".",
                "output": None,
                "packages": None,
                "setup_hook": None,
                "simulate": False,
                "suite": None,
                "target": None,
                "tmpdir": None,
                "variant": None,
            },
        )

    def test_parse_env(self):
        """Test parsing --env parameters."""
        args = parse_args(["-e", "KEY=VALUE", "--env", "FOO=bar"])
        self.assertEqual(args.env, {"FOO": "bar", "KEY": "VALUE"})

    def test_malformed_env(self):
        """Test malformed --env parameter (missing equal sign)."""
        stderr = io.StringIO()
        with contextlib.redirect_stderr(stderr), self.assertRaises(SystemExit):
            parse_args(["--env", "invalid"])
        self.assertIn("Failed to parse --env 'invalid'.", stderr.getvalue())

    def test_mirrors_with_spaces(self):
        """Test --mirrors with leading/trailing spaces."""
        args = parse_args(
            [
                "--mirrors",
                "  deb http://deb.debian.org/debian unstable main\t ,  \t, "
                "deb http://deb.debian.org/debian unstable non-free\t",
                "--mirrors",
                "\tdeb http://deb.debian.org/debian unstable contrib ",
            ]
        )
        self.assertEqual(
            args.mirrors,
            [
                "deb http://deb.debian.org/debian unstable main",
                "deb http://deb.debian.org/debian unstable non-free",
                "deb http://deb.debian.org/debian unstable contrib",
            ],
        )

    def test_optional_args(self):
        """Test optional arguments (which also have positional ones)."""
        args = parse_args(
            [
                "--suite",
                "unstable",
                "--target",
                "unstable.tar",
                "--mirrors",
                "deb http://deb.debian.org/debian unstable main,"
                "deb http://deb.debian.org/debian unstable non-free",
                "--mirrors",
                "deb http://deb.debian.org/debian unstable contrib",
            ]
        )
        self.assertEqual(
            get_subset(args.__dict__, {"mirrors", "suite", "target"}),
            {
                "mirrors": [
                    "deb http://deb.debian.org/debian unstable main",
                    "deb http://deb.debian.org/debian unstable non-free",
                    "deb http://deb.debian.org/debian unstable contrib",
                ],
                "suite": "unstable",
                "target": "unstable.tar",
            },
        )

    def test_positional_args(self):
        """Test positional arguments (overwriting optional ones)."""
        args = parse_args(
            [
                "--suite",
                "bullseye",
                "--target",
                "bullseye.tar",
                "--mirrors",
                "deb http://deb.debian.org/debian unstable main,"
                "deb http://deb.debian.org/debian unstable non-free",
                "unstable",
                "unstable.tar",
                "deb http://deb.debian.org/debian unstable contrib",
            ]
        )
        self.assertEqual(
            get_subset(args.__dict__, {"mirrors", "suite", "target"}),
            {
                "mirrors": [
                    "deb http://deb.debian.org/debian unstable main",
                    "deb http://deb.debian.org/debian unstable non-free",
                    "deb http://deb.debian.org/debian unstable contrib",
                ],
                "suite": "unstable",
                "target": "unstable.tar",
            },
        )

    def test_split(self):
        """Test splitting comma and space separated values."""
        args = parse_args(
            [
                "--packages",
                "distro-info ionit,netconsole",
                "--include",
                "openssh-server,restricted-ssh-commands",
                "--components",
                "main,non-free contrib",
                "--architectures",
                "amd64,i386",
            ]
        )
        self.assertEqual(
            get_subset(args.__dict__, {"architectures", "components", "packages"}),
            {
                "architectures": ["amd64", "i386"],
                "components": ["main", "non-free", "contrib"],
                "packages": [
                    "distro-info",
                    "ionit",
                    "netconsole",
                    "openssh-server",
                    "restricted-ssh-commands",
                ],
            },
        )


class TestConfig(unittest.TestCase):
    """
    This unittest class tests the Config object.
    """

    maxDiff = None

    def test_add_command_line_arguments(self):
        """Test Config.add_command_line_arguments()."""
        args = parse_args(
            [
                "-c",
                os.path.join(EXAMPLE_CONFIG_DIR, "Debian-unstable.yaml"),
                "--name",
                "Debian-unstable",
            ]
        )
        config = Config()
        config.add_command_line_arguments(args)
        self.assertEqual(
            config,
            {
                "mmdebstrap": {
                    "keyrings": ["/usr/share/keyrings/debian-archive-keyring.gpg"],
                    "mode": "unshare",
                    "suite": "unstable",
                    "target": "root.tar.xz",
                    "variant": "minbase",
                },
                "name": "Debian-unstable",
            },
        )

    def test_config_and_arguments(self):
        """Test Config.add_command_line_arguments() with config file and arguments."""
        args = parse_args(
            [
                "-c",
                os.path.join(EXAMPLE_CONFIG_DIR, "Debian-unstable.yaml"),
                "--name",
                "Debian-unstable",
                "--variant",
                "standard",
                "--mode",
                "root",
                "--aptopt",
                'Apt::Install-Recommends "0"',
                "--keyring",
                "/usr/share/keyrings",
                "--dpkgopt",
                "force-confdef",
                "--dpkgopt",
                "force-confold",
                "--include",
                "ionit,netconsole",
                "--components",
                "main,non-free",
                "--architectures",
                "i386",
                "--mirrors",
                "http://deb.debian.org/debian",
                "unstable",
                "unstable.tar",
            ]
        )
        config = Config()
        config.add_command_line_arguments(args)
        self.assertDictEqual(
            config,
            {
                "mmdebstrap": {
                    "aptopts": ['Apt::Install-Recommends "0"'],
                    "architectures": ["i386"],
                    "components": ["main", "non-free"],
                    "dpkgopts": ["force-confdef", "force-confold"],
                    "keyrings": [
                        "/usr/share/keyrings/debian-archive-keyring.gpg",
                        "/usr/share/keyrings",
                    ],
                    "mirrors": ["http://deb.debian.org/debian"],
                    "mode": "root",
                    "packages": ["ionit", "netconsole"],
                    "suite": "unstable",
                    "target": "unstable.tar",
                    "variant": "standard",
                },
                "name": "Debian-unstable",
            },
        )

    @staticmethod
    def test_check_example():
        """Test example unstable.yaml file."""
        config = Config()
        config.load(os.path.join(EXAMPLE_CONFIG_DIR, "Debian-unstable.yaml"))
        config["name"] = "Debian-unstable"
        config.check()

    @staticmethod
    def test_commented_packages():
        """Test commented-packages.yaml file."""
        config = Config()
        config.load(os.path.join(TEST_CONFIG_DIR, "commented-packages.yaml"))
        config.sanitize_packages()
        config.check()

    def test_env_items(self):
        """Test environment variables for example unstable.yaml."""
        config = Config()
        config.load(os.path.join(EXAMPLE_CONFIG_DIR, "Debian-unstable.yaml"))
        config["name"] = "Debian-unstable"
        self.assertEqual(
            config.env_items(),
            [
                ("BDEBSTRAP_HOOKS", HOOKS_DIR),
                ("BDEBSTRAP_NAME", "Debian-unstable"),
                ("BDEBSTRAP_OUTPUT_DIR", "/tmp/bdebstrap-output"),
            ],
        )

    def test_loading(self):
        """Test loading a YAML configuration file."""
        config = Config()
        config.load(os.path.join(EXAMPLE_CONFIG_DIR, "Debian-unstable.yaml"))
        self.assertEqual(
            config,
            {
                "mmdebstrap": {
                    "keyrings": ["/usr/share/keyrings/debian-archive-keyring.gpg"],
                    "mode": "unshare",
                    "suite": "unstable",
                    "target": "root.tar.xz",
                    "variant": "minbase",
                }
            },
        )

    def test_yaml_rendering(self):
        """Test that config.yaml is formatted correctly."""
        config = Config()
        config_filename = os.path.join(EXAMPLE_CONFIG_DIR, "Debian-unstable.yaml")
        config.load(config_filename)
        with tempfile.NamedTemporaryFile() as temp_file:
            config.save(temp_file.name)
            with open(temp_file.name, encoding="utf-8") as config_file:
                output_config = config_file.read()
        with open(config_filename, encoding="utf-8") as config_file:
            input_config = config_file.read()
        self.assertEqual(output_config, input_config)

    def test_source_date_epoch(self):
        """Test getting and setting SOURCE_DATE_EPOCH."""
        config = Config()
        self.assertIsNone(config.source_date_epoch)
        with unittest.mock.patch("time.time", return_value=1581694618.0388665):
            config.set_source_date_epoch()
        self.assertEqual(config.source_date_epoch, 1581694618)

    def test_wrong_element_type(self):
        """Test error message for wrong list element type."""
        config = Config()
        config.load(os.path.join(TEST_CONFIG_DIR, "wrong-element-type.yaml"))
        with self.assertRaisesRegex(ValueError, "'customize-hooks' has type 'CommentedMap'"):
            config.check()


class TestDictMerge(unittest.TestCase):
    """Unittests for dict_merge function."""

    def test_merge_lists(self):
        """Test merging nested dicts."""
        items = {"A": ["A1", "A2", "A3"], "C": 4}
        dict_merge(items, {"A": ["A4", "A5"]})
        self.assertEqual(items, {"A": ["A1", "A2", "A3", "A4", "A5"], "C": 4})

    def test_merge_nested_dicts(self):
        """Test merging nested dicts."""
        items = {"A": {"A1": 0, "A4": 4}, "C": 4}
        dict_merge(items, {"A": {"A1": 1, "A5": 5}})
        self.assertEqual(items, {"A": {"A1": 1, "A4": 4, "A5": 5}, "C": 4})
