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#!/opt/imh-python/bin/python3
"""custom-ns: sets up custom nameservers"""
from collections import OrderedDict
import argparse
import sys
import os
from subprocess import run, DEVNULL, PIPE, CalledProcessError
import re
from blessings import Terminal
import rads
from fix_reseller import fix_reseller, is_reseller, set_reseller_nameservers
import named
from select_menu import select_menu

TERM = Terminal()
MENU = OrderedDict(
    [
        ('Reseller', ''),
        ('Domain', ''),
        ('NS1 Name', 'ns1'),
        ('NS1 IP', ''),
        ('NS2 Name', 'ns2'),
        ('NS2 IP', ''),
    ]
)
SELECTION = 0


def do_setup():
    """The MENU global dict contains chosen final, options. Proceeed"""

    print('proceeding to set up custom nameservers:\n')

    fix_reseller(MENU['Reseller'])

    print('Adding ns1/ns2 A or AAAA records ...')
    named.set_ns_records(
        MENU['Domain'],
        MENU['NS1 Name'],
        MENU['NS1 IP'],
        MENU['NS2 Name'],
        MENU['NS2 IP'],
    )

    if is_reseller(MENU['Reseller']):
        print(f"Setting reseller nameservers for {MENU['Reseller']} ...")
        set_reseller_nameservers(
            MENU['Reseller'], MENU['Domain'], MENU['NS1 Name'], MENU['NS2 Name']
        )

    print('detecting firewall type ...', end=' ')
    fwtype, fwhook = detect_firewall()
    print(fwtype)

    if fwhook is not None:
        print(f'checking {fwtype} firewall configuration ...')
        fwhook()

    print('running /scripts/setupnameserver ...')
    named.enable_bind()

    print('enabling BIND in /etc/chkserv.d/chkservd.conf ...')
    named.enable_in_chkservd()

    print('Turning off DNS recursion in BIND ...')
    named.disable_recursion()

    print('Enabling all hosts to query nameservers ...')
    named.allow_query_all()

    print('Reloading BIND ...')
    named.rndc_reload()

    print('Restarting cPanel ...')
    try:
        run(['service', 'cpanel', 'restart'], stderr=DEVNULL, check=True)
    except CalledProcessError:
        print(TERM.bold_red('failed to start cpanel!'))


def parse_line(ltxt):
    """parse config line; return tuple of key, value"""
    toks = re.match(r'^\s*([^=]+)\s*=\s*(.*)\s*$', ltxt)
    if toks is not None:
        lkey = toks.group(1).strip().upper()
        lval = toks.group(2).strip()
        if lval.startswith('"') or lval.startswith('\''):
            lval = lval[1:-1].strip()
        return (lkey, lval)
    return (None, ltxt)


def config_firewall(confpath, keylist, svcname):
    """Make config changes to firewall configs"""
    with open(confpath, encoding='utf-8') as f:
        alines = f.readlines()

    changes = 0
    for lnum, aline in enumerate(alines):
        ikey, ival = parse_line(aline)
        if ikey in keylist:
            ports = [
                _f for _f in [tport.strip() for tport in ival.split(',')] if _f
            ]
            if '53' not in ports:
                ports.append('53')
                newline = '{}="{}"\n'.format(ikey, ','.join(ports))
                alines[lnum] = newline
                changes += 1
                print(f'  -- added port 53 to {ikey}')
            else:
                print(
                    f'  -- port 53 already exists in {ikey}, no change required'
                )

    if changes > 0:
        try:
            with open(confpath, 'w', encoding='utf-8') as f:
                f.writelines(alines)
            print(f"updated {svcname} configuration written OK")
            return 1
        except Exception as e:
            print(
                "ERROR: failed to write updated configuration to",
                f"/etc/conf/conf.apf: {e}",
            )
    else:
        print("firewall configuration up-to-date, no changes required")
    return 0


def setup_firewall_apf():
    """Update APF configuration"""
    if (
        config_firewall(
            '/etc/apf/conf.apf', ['IG_TCP_CPORTS', 'IG_UDP_CPORTS'], 'APF'
        )
        == 1
    ):
        print("reloading APF ...")
        run(['apf', '-r'], stdout=DEVNULL, check=False)


def setup_firewall_csf():
    """Update CSF configuration"""
    if config_firewall('/etc/csf/csf.conf', ['TCP_IN', 'UDP_IN'], 'CSF') == 1:
        print("reloading CSF ...")
        run(['csf', '-r'], stdout=DEVNULL, check=False)


def detect_firewall():
    """Determine installed firewall"""
    if os.path.exists('/etc/apf/conf.apf'):
        fwtype = "APF"
        fwhook = setup_firewall_apf
    elif os.path.exists('/etc/csf/csf.conf'):
        fwtype = "CSF"
        fwhook = setup_firewall_csf
    else:
        fwtype = "None or unsupported"
        fwhook = None
    return (fwtype, fwhook)


def get_all_ips():
    """Get all IP addresses on the server"""
    ips = []
    ip_re = re.compile(r'\s*inet6? (?P<ip>[^/]*)')
    ret = run(
        ['ip', 'addr', 'show', 'scope', 'global'],
        stdout=PIPE,
        encoding='utf-8',
        check=False,
    )
    for line in ret.stdout.splitlines():
        if match := ip_re.match(line):
            ips.append(match.groupdict()['ip'])
    return ips


def get_main_ip():
    """Return main IP from wwwacct.conf if set, or a random IP if not"""
    with open('/etc/wwwacct.conf', encoding='utf-8') as wwwacct:
        for line in wwwacct.read().splitlines():
            if not line.startswith('ADDR '):
                continue
            try:
                return line.split()[1]
            except IndexError:
                return get_all_ips()[0]
    return get_all_ips()[0]


def show_main_menu():
    """Show the main ncurses menu"""
    print(TERM.clear())
    for index, key in enumerate(MENU):
        print('%13s:' % key, end=' ')  # print the label, right justified
        if index == SELECTION:
            # if selected, display highligted
            print(TERM.bold_black_on_white, end=' ')
        else:
            print(TERM.normal, end=' ')
        print('%-60s' % MENU[key], end=' ')
        print(TERM.normal)
    print()
    # at the bottom of the menu, display a SETUP button
    with TERM.location(10, None):
        if SELECTION == len(MENU):
            print(TERM.bold_black_on_white, 'SETUP', TERM.normal)
        else:
            print(' SETUP')


def get_default_reseller():
    """Determine the default reseller to show in the UI"""
    # most servers will only have one reseller. grab the first valid reseller
    with open('/var/cpanel/resellers', encoding='utf-8') as res_file:
        for line in res_file.read().splitlines():
            user = line.split(':')[0]
            if user not in rads.SYS_USERS and rads.is_cpuser(user):
                return user
    # this server was provisioned wrong. Grab the first valid user
    for user in os.listdir('/var/cpanel/users'):
        if user not in rads.SYS_USERS and rads.is_cpuser(user):
            return user
    # no valid users at all? We can't proceed until someone is provisioned
    sys.exit('No cpanel users found')


def populate_form_from_reseller():
    """Populate Domain, NS1, and NS2 given the chosen reseller"""
    dom = rads.get_primary_domain(MENU['Reseller'])
    if dom is None:
        for key in ('Domain', 'NS1', 'NS2'):
            MENU[key] = 'ERROR'
    else:
        main_ip = get_main_ip()
        MENU['Domain'] = dom
        MENU['NS1 IP'] = main_ip
        MENU['NS2 IP'] = main_ip


def try_args():
    """Try to parse a reseller name from commandline arguments
    Return True if possible, or False to use the ncurses menu"""
    parser = argparse.ArgumentParser(
        description='Setup Custom Nameservers',
        epilog='If no user is provided, an ncurses menu will display',
    )
    parser.add_argument(
        'user',
        metavar='USER',
        nargs='?',
        default=None,
        const=None,
        help='reseller on whos primary domain to setup custom nameservers',
    )
    user = parser.parse_args().user
    if user is None:
        # no user was chosen from commandline arguments
        return False
    if not rads.is_cpuser(user):
        sys.exit(f'{user} is not a cPanel user')
    MENU['Reseller'] = user
    populate_form_from_reseller()
    if 'ERROR' in list(MENU.values()):
        sys.exit(
            'unable to get primary domain for %s. Please use ncurses menu '
            'instead to specify it manually by providing no command arguments'
        )
    question = 'Proceed with the following values?\n'
    for key, value in MENU.items():
        question = f'{question}\n{key}: {value}'
    question = f'{question}\n\n'
    if rads.prompt_y_n(question):
        return True
    sys.exit('Specify another reseller or none to use the ncurses menu')


def take_form_input():
    """Allow typable fields in the main form"""
    with TERM.location(0, 10):
        key = dict(enumerate(MENU))[SELECTION]
        try:
            MENU[key] = input(f'Enter new value for {key}: ')
        except KeyboardInterrupt:
            pass  # exit menu


if __name__ == '__main__':
    # if we can collect a reseller from commandline arguments
    if try_args():
        # skip the ncurses stuff, go straight to the setup
        do_setup()
        sys.exit(0)

    # pre-populate the ncurses menu with stuff
    MENU['Reseller'] = get_default_reseller()
    populate_form_from_reseller()
    print(TERM.enter_fullscreen())
    show_main_menu()

    # main loop for the ncurses menu
    while True:
        try:
            keypress = rads.get_keypress()
            print(repr(keypress))
        except KeyboardInterrupt:
            print(TERM.exit_fullscreen())
            sys.exit(0)
        if keypress == 'ESC':
            print(TERM.exit_fullscreen())
            sys.exit(0)
        elif keypress == 'ENTER':
            if SELECTION == 0:
                users = [
                    x
                    for x in os.listdir('/var/cpanel/users')
                    if rads.is_cpuser(x)
                ]
                try:
                    MENU['Reseller'] = select_menu('Select a user', users)
                    populate_form_from_reseller()
                except KeyboardInterrupt:
                    pass  # go back up one menu
            elif SELECTION == 3:
                try:
                    MENU['NS1 IP'] = select_menu('Select an IP', get_all_ips())
                except KeyboardInterrupt:
                    pass  # cancel
            elif SELECTION == 5:
                try:
                    MENU['NS2 IP'] = select_menu('Select an IP', get_all_ips())
                except KeyboardInterrupt:
                    pass  # go back up one menu
            elif SELECTION == len(MENU):  # setup button
                print(TERM.exit_fullscreen())
                do_setup()
                break
            else:
                take_form_input()
        elif keypress == "ARROW_DN":
            SELECTION += 1
        elif keypress == "ARROW_UP":
            SELECTION -= 1
        elif keypress == 'TAB':
            SELECTION = len(MENU)  # jump to setup button
        SELECTION = SELECTION % (len(MENU) + 1)
        show_main_menu()
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