# -*- coding: utf-8 -*-
'''
    :codeauthor: Nicole Thomas <nicole@saltstack.com>
'''

# Import Python Libs
from __future__ import absolute_import, print_function, unicode_literals
import os
import random

# Import Salt Libs
import salt.utils.files
from salt.exceptions import CommandExecutionError

# Import Salt Testing Libs
from tests.support.case import ModuleCase
from tests.support.helpers import destructiveTest, skip_if_not_root

# Module Variables
ASSIGN_CMD = 'net.inet.icmp.icmplim'
CONFIG = '/etc/sysctl.conf'


@destructiveTest
@skip_if_not_root
class DarwinSysctlModuleTest(ModuleCase):
    '''
    Integration tests for the darwin_sysctl module
    '''

    def setUp(self):
        '''
        Sets up the test requirements
        '''
        super(DarwinSysctlModuleTest, self).setUp()
        os_grain = self.run_function('grains.item', ['kernel'])
        if os_grain['kernel'] not in 'Darwin':
            self.skipTest(
                'Test not applicable to \'{kernel}\' kernel'.format(
                    **os_grain
                )
            )
        # Data needed for cleanup
        self.has_conf = False
        self.val = self.run_function('sysctl.get', [ASSIGN_CMD])

        # If sysctl file is present, make a copy
        # Remove original file so we can replace it with test files
        if os.path.isfile(CONFIG):
            self.has_conf = True
            try:
                self.conf = self.__copy_sysctl()
            except CommandExecutionError:
                msg = 'Could not copy file: {0}'
                raise CommandExecutionError(msg.format(CONFIG))
            os.remove(CONFIG)

    def test_assign(self):
        '''
        Tests assigning a single sysctl parameter
        '''
        try:
            rand = random.randint(0, 500)
            while rand == self.val:
                rand = random.randint(0, 500)
            self.run_function('sysctl.assign', [ASSIGN_CMD, rand])
            info = int(self.run_function('sysctl.get', [ASSIGN_CMD]))
            try:
                self.assertEqual(rand, info)
            except AssertionError:
                self.run_function('sysctl.assign', [ASSIGN_CMD, self.val])
                raise
        except CommandExecutionError:
            self.run_function('sysctl.assign', [ASSIGN_CMD, self.val])
            raise

    def test_persist_new_file(self):
        '''
        Tests assigning a sysctl value to a system without a sysctl.conf file
        '''
        # Always start with a clean/known sysctl.conf state
        if os.path.isfile(CONFIG):
            os.remove(CONFIG)
        try:
            self.run_function('sysctl.persist', [ASSIGN_CMD, 10])
            line = '{0}={1}'.format(ASSIGN_CMD, 10)
            found = self.__check_string(CONFIG, line)
            try:
                self.assertTrue(found)
            except AssertionError:
                raise
        except CommandExecutionError:
            os.remove(CONFIG)
            raise

    def test_persist_already_set(self):
        '''
        Tests assigning a sysctl value that is already set in sysctl.conf file
        '''
        # Always start with a clean/known sysctl.conf state
        if os.path.isfile(CONFIG):
            os.remove(CONFIG)
        try:
            self.run_function('sysctl.persist', [ASSIGN_CMD, 50])
            ret = self.run_function('sysctl.persist', [ASSIGN_CMD, 50])
            try:
                self.assertEqual(ret, 'Already set')
            except AssertionError:
                raise
        except CommandExecutionError:
            os.remove(CONFIG)
            raise

    def test_persist_apply_change(self):
        '''
        Tests assigning a sysctl value and applying the change to system
        '''
        # Always start with a clean/known sysctl.conf state
        if os.path.isfile(CONFIG):
            os.remove(CONFIG)
        try:
            rand = random.randint(0, 500)
            while rand == self.val:
                rand = random.randint(0, 500)
            self.run_function('sysctl.persist',
                              [ASSIGN_CMD, rand],
                              apply_change=True)
            info = int(self.run_function('sysctl.get', [ASSIGN_CMD]))
            try:
                self.assertEqual(info, rand)
            except AssertionError:
                raise
        except CommandExecutionError:
            os.remove(CONFIG)
            raise

    def __copy_sysctl(self):
        '''
        Copies an existing sysconf file and returns temp file path. Copied
        file will be restored in tearDown
        '''
        # Create new temporary file path and open needed files
        temp_path = salt.utils.files.mkstemp()
        with salt.utils.files.fopen(CONFIG, 'r') as org_conf:
            with salt.utils.files.fopen(temp_path, 'w') as temp_sysconf:
                # write sysctl lines to temp file
                for line in org_conf:
                    temp_sysconf.write(line)
        return temp_path

    def __restore_sysctl(self):
        '''
        Restores the original sysctl.conf file from temporary copy
        '''
        # If sysctl testing file exists, delete it
        if os.path.isfile(CONFIG):
            os.remove(CONFIG)

        # write temp lines to sysctl file to restore
        with salt.utils.files.fopen(self.conf, 'r') as temp_sysctl:
            with salt.utils.files.fopen(CONFIG, 'w') as sysctl:
                for line in temp_sysctl:
                    sysctl.write(line)

        # delete temporary file
        os.remove(self.conf)

    def __check_string(self, conf_file, to_find):
        '''
        Returns True if given line is present in file
        '''
        with salt.utils.files.fopen(conf_file, 'r') as f_in:
            for line in f_in:
                if to_find in salt.utils.stringutils.to_unicode(line):
                    return True
            return False

    def tearDown(self):
        '''
        Clean up after tests
        '''
        ret = self.run_function('sysctl.get', [ASSIGN_CMD])
        if ret != self.val:
            self.run_function('sysctl.assign', [ASSIGN_CMD, self.val])

        if self.has_conf is True:
            # restore original sysctl file
            self.__restore_sysctl()

        if self.has_conf is False and os.path.isfile(CONFIG):
            # remove sysctl.conf created by tests
            os.remove(CONFIG)