#!/usr/bin/env python3
#
# Copyright © 2020 Red Hat, Inc.
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the "Software"),
# to deal in the Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish, distribute, sublicense,
# and/or sell copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice (including the next
# paragraph) shall be included in all copies or substantial portions of the
# Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
# DEALINGS IN THE SOFTWARE.

import itertools
import os
import resource
import sys
import subprocess
import logging
import tempfile
import unittest


try:
    top_builddir = os.environ['top_builddir']
    top_srcdir = os.environ['top_srcdir']
except KeyError:
    print('Required environment variables not found: top_srcdir/top_builddir', file=sys.stderr)
    from pathlib import Path
    top_srcdir = '.'
    try:
        top_builddir = next(Path('.').glob('**/meson-logs/')).parent
    except StopIteration:
        sys.exit(1)
    print('Using srcdir "{}", builddir "{}"'.format(top_srcdir, top_builddir), file=sys.stderr)


logging.basicConfig(level=logging.DEBUG)
logger = logging.getLogger('test')
logger.setLevel(logging.DEBUG)

# Permutation of RMLVO that we use in multiple tests
rmlvos = [list(x) for x in itertools.permutations(
    ['--rules=evdev', '--model=pc104',
     '--layout=ch', '--options=eurosign:5']
)]


def _disable_coredump():
    resource.setrlimit(resource.RLIMIT_CORE, (0, 0))


def run_command(args):
    logger.debug('run command: {}'.format(' '.join(args)))

    try:
        p = subprocess.run(args, preexec_fn=_disable_coredump,
                           capture_output=True, text=True,
                           timeout=0.7)
        return p.returncode, p.stdout, p.stderr
    except subprocess.TimeoutExpired as e:
        return 0, e.stdout, e.stderr


class XkbcliTool:
    xkbcli_tool = 'xkbcli'
    subtool = None

    def __init__(self, subtool=None, skipIf=(), skipError=()):
        self.tool_path = top_builddir
        self.subtool = subtool
        self.skipIf = skipIf
        self.skipError = skipError

    def run_command(self, args):
        for condition, reason in self.skipIf:
            if condition:
                raise unittest.SkipTest(reason)
        if self.subtool is not None:
            tool = '{}-{}'.format(self.xkbcli_tool, self.subtool)
        else:
            tool = self.xkbcli_tool
        args = [os.path.join(self.tool_path, tool)] + args

        return run_command(args)

    def run_command_success(self, args):
        rc, stdout, stderr = self.run_command(args)
        if rc != 0:
            for testfunc, reason in self.skipError:
                if testfunc(rc, stdout, stderr):
                    raise unittest.SkipTest(reason)
        assert rc == 0, (stdout, stderr)
        return stdout, stderr

    def run_command_invalid(self, args):
        rc, stdout, stderr = self.run_command(args)
        assert rc == 2, (rc, stdout, stderr)
        return rc, stdout, stderr

    def run_command_unrecognized_option(self, args):
        rc, stdout, stderr = self.run_command(args)
        assert rc == 2, (rc, stdout, stderr)
        assert stdout.startswith('Usage') or stdout == ''
        assert 'unrecognized option' in stderr

    def run_command_missing_arg(self, args):
        rc, stdout, stderr = self.run_command(args)
        assert rc == 2, (rc, stdout, stderr)
        assert stdout.startswith('Usage') or stdout == ''
        assert 'requires an argument' in stderr

    def __str__(self):
        return str(self.subtool)


class TestXkbcli(unittest.TestCase):
    @classmethod
    def setUpClass(cls):
        cls.xkbcli = XkbcliTool()
        cls.xkbcli_list = XkbcliTool('list', skipIf=(
            (not int(os.getenv('HAVE_XKBCLI_LIST', '1')), 'xkbregistory not enabled'),
        ))
        cls.xkbcli_how_to_type = XkbcliTool('how-to-type')
        cls.xkbcli_compile_keymap = XkbcliTool('compile-keymap')
        cls.xkbcli_interactive_evdev = XkbcliTool('interactive-evdev', skipIf=(
            (not int(os.getenv('HAVE_XKBCLI_INTERACTIVE_EVDEV', '1')), 'evdev not enabled'),
            (not os.path.exists('/dev/input/event0'), 'event node required'),
            (not os.access('/dev/input/event0', os.R_OK), 'insufficient permissions'),
        ), skipError=(
            (lambda rc, stdout, stderr: 'Couldn\'t find any keyboards' in stderr,
                'No keyboards available'),
        ),
        )
        cls.xkbcli_interactive_x11 = XkbcliTool('interactive-x11', skipIf=(
            (not int(os.getenv('HAVE_XKBCLI_INTERACTIVE_X11', '1')), 'x11 not enabled'),
            (not os.getenv('DISPLAY'), 'DISPLAY not set'),
        ))
        cls.xkbcli_interactive_wayland = XkbcliTool('interactive-wayland', skipIf=(
            (not int(os.getenv('HAVE_XKBCLI_INTERACTIVE_WAYLAND', '1')), 'wayland not enabled'),
            (not os.getenv('WAYLAND_DISPLAY'), 'WAYLAND_DISPLAY not set'),
        ))
        cls.all_tools = [
            cls.xkbcli,
            cls.xkbcli_list,
            cls.xkbcli_how_to_type,
            cls.xkbcli_compile_keymap,
            cls.xkbcli_interactive_evdev,
            cls.xkbcli_interactive_x11,
            cls.xkbcli_interactive_wayland,
        ]

    def test_help(self):
        # --help is supported by all tools
        for tool in self.all_tools:
            with self.subTest(tool=tool):
                stdout, stderr = tool.run_command_success(['--help'])
                assert stdout.startswith('Usage:')
                assert stderr == ''

    def test_invalid_option(self):
        # --foobar generates "Usage:" for all tools
        for tool in self.all_tools:
            with self.subTest(tool=tool):
                tool.run_command_unrecognized_option(['--foobar'])

    def test_xkbcli_version(self):
        # xkbcli --version
        stdout, stderr = self.xkbcli.run_command_success(['--version'])
        assert stdout.startswith('1')
        assert stderr == ''

    def test_xkbcli_too_many_args(self):
        self.xkbcli.run_command_invalid(['a'] * 64)

    def test_compile_keymap_args(self):
        for args in (
            ['--verbose'],
            ['--rmlvo'],
            # ['--kccgst'],
            ['--verbose', '--rmlvo'],
            # ['--verbose', '--kccgst'],
        ):
            with self.subTest(args=args):
                self.xkbcli_compile_keymap.run_command_success(args)

    def test_compile_keymap_rmlvo(self):
        for rmlvo in rmlvos:
            with self.subTest(rmlvo=rmlvo):
                self.xkbcli_compile_keymap.run_command_success(rmlvo)

    def test_compile_keymap_include(self):
        for args in (
            ['--include', '.', '--include-defaults'],
            ['--include', '/tmp', '--include-defaults'],
        ):
            with self.subTest(args=args):
                # Succeeds thanks to include-defaults
                self.xkbcli_compile_keymap.run_command_success(args)

    def test_compile_keymap_include_invalid(self):
        # A non-directory is rejected by default
        args = ['--include', '/proc/version']
        rc, stdout, stderr = self.xkbcli_compile_keymap.run_command(args)
        assert rc == 1, (stdout, stderr)
        assert "There are no include paths to search" in stderr

        # A non-existing directory is rejected by default
        args = ['--include', '/tmp/does/not/exist']
        rc, stdout, stderr = self.xkbcli_compile_keymap.run_command(args)
        assert rc == 1, (stdout, stderr)
        assert "There are no include paths to search" in stderr

        # Valid dir, but missing files
        args = ['--include', '/tmp']
        rc, stdout, stderr = self.xkbcli_compile_keymap.run_command(args)
        assert rc == 1, (stdout, stderr)
        assert "Couldn't look up rules" in stderr

    def test_how_to_type(self):
        # Unicode codepoint conversions, we support whatever strtol does
        for args in (['123'], ['0x123'], ['0123']):
            with self.subTest(args=args):
                self.xkbcli_how_to_type.run_command_success(args)

    def test_how_to_type_rmlvo(self):
        for rmlvo in rmlvos:
            with self.subTest(rmlvo=rmlvo):
                args = rmlvo + ['0x1234']
                self.xkbcli_how_to_type.run_command_success(args)

    def test_list_rmlvo(self):
        for args in (
            ['--verbose'],
            ['-v'],
            ['--verbose', '--load-exotic'],
            ['--load-exotic'],
            ['--ruleset=evdev'],
            ['--ruleset=base'],
        ):
            with self.subTest(args=args):
                self.xkbcli_list.run_command_success(args)

    def test_list_rmlvo_includes(self):
        args = ['/tmp/']
        self.xkbcli_list.run_command_success(args)

    def test_list_rmlvo_includes_invalid(self):
        args = ['/proc/version']
        rc, stdout, stderr = self.xkbcli_list.run_command(args)
        assert rc == 1
        assert "Failed to append include path" in stderr

    def test_list_rmlvo_includes_no_defaults(self):
        args = ['--skip-default-paths', '/tmp']
        rc, stdout, stderr = self.xkbcli_list.run_command(args)
        assert rc == 1
        assert "Failed to parse XKB description" in stderr

    def test_interactive_evdev_rmlvo(self):
        for rmlvo in rmlvos:
            with self.subTest(rmlvo=rmlvo):
                self.xkbcli_interactive_evdev.run_command_success(rmlvo)

    def test_interactive_evdev(self):
        # Note: --enable-compose fails if $prefix doesn't have the compose tables
        # installed
        for args in (
            ['--report-state-changes'],
            ['--enable-compose'],
            ['--consumed-mode=xkb'],
            ['--consumed-mode=gtk'],
            ['--without-x11-offset'],
        ):
            with self.subTest(args=args):
                self.xkbcli_interactive_evdev.run_command_success(args)

    def test_interactive_x11(self):
        # To be filled in if we handle something other than --help
        pass

    def test_interactive_wayland(self):
        # To be filled in if we handle something other than --help
        pass


if __name__ == '__main__':
    with tempfile.TemporaryDirectory() as tmpdir:
        # Use our own test xkeyboard-config copy.
        os.environ['XKB_CONFIG_ROOT'] = top_srcdir + '/test/data'
        # Use our own X11 locale copy.
        os.environ['XLOCALEDIR'] = top_srcdir + '/test/data/locale'
        # Use our own locale.
        os.environ['LC_CTYPE'] = 'en_US.UTF-8'
        # libxkbcommon has fallbacks when XDG_CONFIG_HOME isn't set so we need
        # to override it with a known (empty) directory. Otherwise our test
        # behavior depends on the system the test is run on.
        os.environ['XDG_CONFIG_HOME'] = tmpdir
        # Prevent the legacy $HOME/.xkb from kicking in.
        del os.environ['HOME']
        # This needs to be separated if we do specific extra path testing
        os.environ['XKB_CONFIG_EXTRA_PATH'] = tmpdir

        unittest.main()
