import os
import pytest
import re

SETUPVARS_LOC='/etc/pihole/setupVars.conf'
DNSMASQ_CONFIG_LOC = '/etc/dnsmasq.d/01-pihole.conf'
EVAL_SETUP_FTL_CACHESIZE='. ./bash_functions.sh ; eval `grep setup_FTL_CacheSize /start.sh`'
EVAL_SETUP_FTL_INTERFACE='. ./bash_functions.sh ; eval `grep setup_FTL_Interface /start.sh`'
EVAL_SETUP_WEB_PASSWORD='. ./bash_functions.sh ; eval `grep setup_web_password /start.sh`'

def _cat(file):
    return 'cat {}'.format(file)

def _grep(string, file):
    return 'grep -q \'{}\' {}'.format(string,file)

@pytest.mark.parametrize('test_args,expected_ipv6,expected_stdout', [
    ('', True, 'IPv4 and IPv6'),
    ('-e "IPv6=True"', True, 'IPv4 and IPv6'),
    ('-e "IPv6=False"', False, 'IPv4'),
    ('-e "IPv6=foobar"', False, 'IPv4'),
])
def test_ipv6_not_true_removes_ipv6(docker, slow, test_args, expected_ipv6, expected_stdout):
    ''' When a user overrides IPv6=True they only get IPv4 listening webservers '''
    IPV6_LINE = 'use-ipv6.pl'
    WEB_CONFIG = '/etc/lighttpd/lighttpd.conf'

    function = docker.run('. /bash_functions.sh ; setup_ipv4_ipv6')
    assert "Using {}".format(expected_stdout) in function.stdout
    if expected_stdout == 'IPv4':
        assert 'IPv6' not in function.stdout
    # On overlay2(?) docker sometimes writes to disk are slow enough to break some tests...
    expected_ipv6_check = lambda: (\
        IPV6_LINE in docker.run('grep \'use-ipv6.pl\' {}'.format(WEB_CONFIG)).stdout
    ) == expected_ipv6
    slow(expected_ipv6_check)


@pytest.mark.parametrize('test_args', ['-e "WEB_PORT=999"'])
def test_overrides_default_web_port(docker, slow, test_args):
    ''' When a --net=host user sets WEB_PORT to avoid synology's 80 default IPv4 and or IPv6 ports are updated'''
    CONFIG_LINE = r'server.port\s*=\s*999'
    WEB_CONFIG = '/etc/lighttpd/lighttpd.conf'

    function = docker.run('. /bash_functions.sh ; eval `grep setup_web_port /start.sh`')
    assert "Custom WEB_PORT set to 999" in function.stdout
    assert "INFO: Without proper router DNAT forwarding to 127.0.0.1:999, you may not get any blocked websites on ads" in function.stdout
    slow(lambda: re.search(CONFIG_LINE, docker.run(_cat(WEB_CONFIG)).stdout) != None)


@pytest.mark.parametrize('test_args,expected_error', [
    ('-e WEB_PORT="LXXX"', 'WARNING: Custom WEB_PORT not used - LXXX is not an integer'),
    ('-e WEB_PORT="1,000"', 'WARNING: Custom WEB_PORT not used - 1,000 is not an integer'),
    ('-e WEB_PORT="99999"', 'WARNING: Custom WEB_PORT not used - 99999 is not within valid port range of 1-65535'),
])
def test_bad_input_to_web_port(docker, test_args, expected_error):
    function = docker.run('. /bash_functions.sh ; eval `grep setup_web_port /start.sh`')
    assert expected_error in function.stdout


@pytest.mark.parametrize('test_args,cache_size', [('-e CUSTOM_CACHE_SIZE="0"', '0'), ('-e CUSTOM_CACHE_SIZE="20000"', '20000')])
def test_overrides_default_custom_cache_size(docker, slow, test_args, cache_size):
    ''' Changes the cache_size setting to increase or decrease the cache size for dnsmasq'''
    CONFIG_LINE = r'cache-size\s*=\s*{}'.format(cache_size)

    function = docker.run('echo ${CUSTOM_CACHE_SIZE};. ./bash_functions.sh; echo ${CUSTOM_CACHE_SIZE}; eval `grep setup_FTL_CacheSize /start.sh`')
    assert "Custom CUSTOM_CACHE_SIZE set to {}".format(cache_size) in function.stdout
    slow(lambda: re.search(CONFIG_LINE, docker.run(_cat(DNSMASQ_CONFIG_LOC)).stdout) != None)


@pytest.mark.parametrize('test_args', [
    '-e CUSTOM_CACHE_SIZE="-1"',
    '-e CUSTOM_CACHE_SIZE="1,000"',
])
def test_bad_input_to_custom_cache_size(docker, slow, test_args):
    CONFIG_LINE = r'cache-size\s*=\s*10000'

    docker.run(EVAL_SETUP_FTL_CACHESIZE)
    slow(lambda: re.search(CONFIG_LINE, docker.run(_cat(DNSMASQ_CONFIG_LOC)).stdout) != None)

@pytest.mark.parametrize('test_args', [
    '-e DNSSEC="true" -e CUSTOM_CACHE_SIZE="0"',
])
def test_dnssec_enabled_with_custom_cache_size(docker, slow, test_args):
    CONFIG_LINE = r'cache-size\s*=\s*10000'

    docker.run(EVAL_SETUP_FTL_CACHESIZE)
    slow(lambda: re.search(CONFIG_LINE, docker.run(_cat(DNSMASQ_CONFIG_LOC)).stdout) != None)


@pytest.mark.parametrize('args_env, expected_stdout, expected_config_line', [
    ('', 'binding to default interface: eth0', 'PIHOLE_INTERFACE=eth0'),
    ('-e INTERFACE="br0"', 'binding to custom interface: br0', 'PIHOLE_INTERFACE=br0'),
])
def test_dns_interface_override_defaults(docker, slow, args_env, expected_stdout, expected_config_line):
    ''' When INTERFACE environment var is passed in, overwrite dnsmasq interface '''
    function = docker.run(EVAL_SETUP_FTL_INTERFACE)
    assert expected_stdout in function.stdout
    slow(lambda: expected_config_line + '\n' == docker.run('grep "^PIHOLE_INTERFACE" {}'.format(SETUPVARS_LOC)).stdout)


expected_debian_lines = [
    '"VIRTUAL_HOST" => "127.0.0.1"',
    '"PHP_ERROR_LOG" => "/var/log/lighttpd/error-pihole.log"'
]


@pytest.mark.parametrize('expected_lines,repeat_function', [
    (expected_debian_lines, 1),
    (expected_debian_lines, 2)
])
def test_debian_setup_php_env(docker, expected_lines, repeat_function):
    ''' confirm all expected output is there and nothing else '''
    for _ in range(repeat_function):
        docker.run('. /bash_functions.sh ; eval `grep setup_php_env /start.sh`').stdout
    for expected_line in expected_lines:
        search_config_cmd = "grep -c '{}' /etc/lighttpd/conf-enabled/15-fastcgi-php.conf".format(expected_line)
        search_config_count = docker.run(search_config_cmd)
        found_lines = int(search_config_count.stdout.rstrip('\n'))
        if found_lines > 1:
            assert False, f'Found line {expected_line} times (more than once): {found_lines}'



def test_webpassword_random_generation(docker):
    ''' When a user sets webPassword env the admin password gets set to that '''
    function = docker.run(EVAL_SETUP_WEB_PASSWORD)
    assert 'assigning random password' in function.stdout.lower()


@pytest.mark.parametrize('entrypoint,cmd', [('--entrypoint=tail','-f /dev/null')])
@pytest.mark.parametrize('args_env,secure,setupvars_hash', [
    ('-e WEBPASSWORD=login', True, 'WEBPASSWORD=6060d59351e8c2f48140f01b2c3f3b61652f396c53a5300ae239ebfbe7d5ff08'),
    ('-e WEBPASSWORD=""', False, ''),
])
def test_webpassword_env_assigns_password_to_file_or_removes_if_empty(docker, args_env, secure, setupvars_hash):
    ''' When a user sets webPassword env the admin password gets set or removed if empty '''
    function = docker.run(EVAL_SETUP_WEB_PASSWORD)

    if secure:
        assert 'new password set' in function.stdout.lower()
        assert docker.run(_grep(setupvars_hash, SETUPVARS_LOC)).rc == 0
    else:
        assert 'password removed' in function.stdout.lower()
        assert docker.run(_grep('^WEBPASSWORD=$', SETUPVARS_LOC)).rc == 0


@pytest.mark.parametrize('entrypoint,cmd', [('--entrypoint=tail','-f /dev/null')])
@pytest.mark.parametrize('test_args', ['-e WEBPASSWORD=login', '-e WEBPASSWORD=""'])
def test_env_always_updates_password(docker, args_env, test_args):
    '''When a user sets the WEBPASSWORD environment variable, ensure it always sets the password'''
    function = docker.run(EVAL_SETUP_WEB_PASSWORD)

    assert '::: Assigning password defined by Environment Variable' in function.stdout


@pytest.mark.parametrize('entrypoint,cmd', [('--entrypoint=tail','-f /dev/null')])
def test_setupvars_trumps_random_password_if_set(docker, args_env, test_args):
    '''If a password is already set in setupvars, and no password is set in the environment variable, do not generate a random password'''
    docker.run('. /opt/pihole/utils.sh ; addOrEditKeyValPair {} WEBPASSWORD volumepass'.format(SETUPVARS_LOC))
    function = docker.run(EVAL_SETUP_WEB_PASSWORD)

    assert 'Pre existing WEBPASSWORD found' in function.stdout
    assert docker.run(_grep('WEBPASSWORD=volumepass', SETUPVARS_LOC)).rc == 0