#
# Copyright OpenEmbedded Contributors
#
# SPDX-License-Identifier: MIT
#

import re
import time

from oeqa.runtime.case import OERuntimeTestCase
from oeqa.core.decorator.depends import OETestDepends
from oeqa.core.decorator.data import skipIfDataVar, skipIfNotDataVar
from oeqa.runtime.decorator.package import OEHasPackage
from oeqa.core.decorator.data import skipIfNotFeature, skipIfFeature

class SystemdTest(OERuntimeTestCase):

    def systemctl(self, action='', target='', expected=0, verbose=False):
        command = 'SYSTEMD_BUS_TIMEOUT=240s systemctl %s %s' % (action, target)
        status, output = self.target.run(command)
        message = '\n'.join([command, output])
        if status != expected and verbose:
            cmd = 'SYSTEMD_BUS_TIMEOUT=240s systemctl status --full %s' % target
            message += self.target.run(cmd)[1]
        self.assertEqual(status, expected, message)
        return output

    #TODO: use pyjournalctl instead
    def journalctl(self, args='',l_match_units=None):
        """
        Request for the journalctl output to the current target system

        Arguments:
        -args, an optional argument pass through argument
        -l_match_units, an optional list of units to filter the output
        Returns:
        -string output of the journalctl command
        Raises:
        -AssertionError, on remote commands that fail
        -ValueError, on a journalctl call with filtering by l_match_units that
        returned no entries
        """

        query_units=''
        if l_match_units:
            query_units = ['_SYSTEMD_UNIT='+unit for unit in l_match_units]
            query_units = ' '.join(query_units)
        command = 'journalctl %s %s' %(args, query_units)
        status, output = self.target.run(command)
        if status:
            raise AssertionError("Command '%s' returned non-zero exit "
                    'code %d:\n%s' % (command, status, output))
        if len(output) == 1 and "-- No entries --" in output:
            raise ValueError('List of units to match: %s, returned no entries'
                    % l_match_units)
        return output

class SystemdBasicTests(SystemdTest):

    def settle(self):
        """
        Block until systemd has finished activating any units being activated,
        or until two minutes has elapsed.

        Returns a tuple, either (True, '') if all units have finished
        activating, or (False, message string) if there are still units
        activating (generally, failing units that restart).
        """
        endtime = time.time() + (60 * 2)
        while True:
            status, output = self.target.run('SYSTEMD_BUS_TIMEOUT=240s systemctl --state=activating')
            if "0 loaded units listed" in output:
                return (True, '')
            if time.time() >= endtime:
                return (False, output)
            time.sleep(10)

    @skipIfNotFeature('systemd',
                      'Test requires systemd to be in DISTRO_FEATURES')
    @skipIfNotDataVar('VIRTUAL-RUNTIME_init_manager', 'systemd',
                      'systemd is not the init manager for this image')
    @OETestDepends(['ssh.SSHTest.test_ssh'])
    def test_systemd_basic(self):
        self.systemctl('--version')

    @OETestDepends(['systemd.SystemdBasicTests.test_systemd_basic'])
    def test_systemd_list(self):
        self.systemctl('list-unit-files')

    @OETestDepends(['systemd.SystemdBasicTests.test_systemd_basic'])
    def test_systemd_failed(self):
        settled, output = self.settle()
        msg = "Timed out waiting for systemd to settle:\n%s" % output
        self.assertTrue(settled, msg=msg)

        output = self.systemctl('list-units', '--failed')
        match = re.search('0 loaded units listed', output)
        if not match:
            output += self.systemctl('status --full --failed')
        self.assertTrue(match, msg='Some systemd units failed:\n%s' % output)


class SystemdServiceTests(SystemdTest):

    @OEHasPackage(['avahi-daemon'])
    @OETestDepends(['systemd.SystemdBasicTests.test_systemd_basic'])
    def test_systemd_status(self):
        self.systemctl('status --full', 'avahi-daemon.service')

    @OETestDepends(['systemd.SystemdServiceTests.test_systemd_status'])
    def test_systemd_stop_start(self):
        self.systemctl('stop', 'avahi-daemon.service')
        self.systemctl('is-active', 'avahi-daemon.service',
                       expected=3, verbose=True)
        self.systemctl('start','avahi-daemon.service')
        self.systemctl('is-active', 'avahi-daemon.service', verbose=True)

    @OETestDepends(['systemd.SystemdServiceTests.test_systemd_status'])
    @skipIfFeature('read-only-rootfs',
                   'Test is only meant to run without read-only-rootfs in IMAGE_FEATURES')
    def test_systemd_disable_enable(self):
        self.systemctl('disable', 'avahi-daemon.service')
        self.systemctl('is-enabled', 'avahi-daemon.service', expected=1)
        self.systemctl('enable', 'avahi-daemon.service')
        self.systemctl('is-enabled', 'avahi-daemon.service')

    @OETestDepends(['systemd.SystemdServiceTests.test_systemd_status'])
    @skipIfNotFeature('read-only-rootfs',
                      'Test is only meant to run with read-only-rootfs in IMAGE_FEATURES')
    def test_systemd_disable_enable_ro(self):
        status = self.target.run('mount -orw,remount /')[0]
        self.assertTrue(status == 0, msg='Remounting / as r/w failed')
        try:
            self.test_systemd_disable_enable()
        finally:
            status = self.target.run('mount -oro,remount /')[0]
            self.assertTrue(status == 0, msg='Remounting / as r/o failed')

class SystemdJournalTests(SystemdTest):

    @OETestDepends(['systemd.SystemdBasicTests.test_systemd_basic'])
    def test_systemd_journal(self):
        status, output = self.target.run('journalctl')
        self.assertEqual(status, 0, output)

    @OETestDepends(['systemd.SystemdBasicTests.test_systemd_basic'])
    def test_systemd_boot_time(self, systemd_TimeoutStartSec=90):
        """
        Get the target boot time from journalctl and log it

        Arguments:
        -systemd_TimeoutStartSec, an optional argument containing systemd's
        unit start timeout to compare against
        """

        # The expression chain that uniquely identifies the time boot message.
        expr_items=['Startup finished', 'kernel', 'userspace', r'\.$']
        try:
            output = self.journalctl(args='-o cat --reverse')
        except AssertionError:
            self.fail('Error occurred while calling journalctl')
        if not len(output):
            self.fail('Error, unable to get startup time from systemd journal')

        # Check for the regular expression items that match the startup time.
        for line in output.split('\n'):
            check_match = ''.join(re.findall('.*'.join(expr_items), line))
            if check_match:
                break
        # Put the startup time in the test log
        if check_match:
            self.tc.logger.info('%s' % check_match)
        else:
            self.skipTest('Error at obtaining the boot time from journalctl')
        boot_time_sec = 0

        # Get the numeric values from the string and convert them to seconds
        # same data will be placed in list and string for manipulation.
        l_boot_time = check_match.split(' ')[-2:]
        s_boot_time = ' '.join(l_boot_time)
        try:
            # Obtain the minutes it took to boot.
            if l_boot_time[0].endswith('min') and l_boot_time[0][0].isdigit():
                boot_time_min = s_boot_time.split('min')[0]
                # Convert to seconds and accumulate it.
                boot_time_sec += int(boot_time_min) * 60
            # Obtain the seconds it took to boot and accumulate.
            boot_time_sec += float(l_boot_time[1].split('s')[0])
        except ValueError:
            self.skipTest('Error when parsing time from boot string')

        # Assert the target boot time against systemd's unit start timeout.
        if boot_time_sec > systemd_TimeoutStartSec:
            msg = ("Target boot time %s exceeds systemd's TimeoutStartSec %s"
                    % (boot_time_sec, systemd_TimeoutStartSec))
            self.tc.logger.info(msg)