from tiramisu import valid_network_netmask, valid_ip_netmask, valid_broadcast, valid_in_network, valid_not_equal as valid_differ, valid_not_equal, calc_value
from ipaddress import ip_address
from os.path import dirname, abspath, join as _join, isdir as _isdir, isfile as _isfile
from typing import List
from json import load
from secrets import token_urlsafe as _token_urlsafe

from rougail.utils import normalize_family

from utils import multi_function, CONFIGS
from x509 import gen_cert as _x509_gen_cert, gen_ca as _x509_gen_ca, gen_pub as _x509_gen_pub, has_pub as _x509_has_pub
# =============================================================
# fork of risotto-setting/src/risotto_setting/config/config.py

with open('servers.json', 'r') as server_fh:
    ZONES_SERVER = load(server_fh)


ZONES = None
DOMAINS = None
HERE = dirname(abspath(__file__))


def load_zones():
    global ZONES
    if ZONES is not None:
        return
    ZONES = ZONES_SERVER['zones']
    for server_name, server in ZONES_SERVER['servers'].items():
        if 'informations' not in server:
            continue
        server_zones = server['informations']['zones_name']
        server_extra_domainnames = server['informations'].get('extra_domainnames', [])
        if len(server_zones) > 1 and len(server_zones) != len(server_extra_domainnames) + 1:
            raise Exception(f'the server "{server_name}" has more that one zone, please set correct number of extra_domainnames ({len(server_zones) - 1} instead of {len(server_extra_domainnames)})')
            
        for idx, zone_name in enumerate(server_zones):
            zone_domain_name = ZONES[zone_name]['domain_name']
            if idx == 0:
                zone_server_name = server_name
            else:
                zone_server_name = server_extra_domainnames[idx - 1]
            server_domain_name = zone_server_name.split('.', 1)[1]
            if zone_domain_name and zone_domain_name != server_domain_name:
                raise Exception(f'wrong server_name "{zone_server_name}" in zone "{zone_name}" should ends with "{zone_domain_name}"')
            ZONES[zone_name].setdefault('hosts', []).append(server_name)


def load_domains():
    load_zones()
    global DOMAINS
    if DOMAINS is not None:
        return
    DOMAINS = {}
    for zone_name, zone in ZONES_SERVER['zones'].items():
        if 'domain_name' in zone:
            hosts = []
            ips = []
            for host in ZONES[zone_name].get('hosts', []):
                hosts.append(host.split('.', 1)[0])
                ips.append(get_ip(host, [zone_name], 0))
            DOMAINS[zone['domain_name']] = (tuple(hosts), tuple(ips))


def get_ip(server_name: str,
           zones_name: List[str],
           index: str,
           ) -> str:
    if server_name is None:
        return
    load_zones()
    index = int(index)
    zone_name = zones_name[index]
    if zone_name not in ZONES:
        raise ValueError(f"cannot set IP in unknown zone '{zone_name}'")
    zone = ZONES[zone_name]
    if server_name not in zone['hosts']:
        raise ValueError(f"cannot set IP in unknown server '{server_name}'")
    server_index = zone['hosts'].index(server_name)
#    print(server_name, zones_name, index, str(ip_address(zone['start_ip']) + server_index))
    return str(ip_address(zone['start_ip']) + server_index)


@multi_function
def get_chain(authority_cn,
              authority_name,
              ):
    if not authority_name or authority_name is None:
        if isinstance(authority_name, list):
            return []
        return
    if not isinstance(authority_cn, list):
        is_list = False
        authority_cn = [authority_cn]
    else:
        is_list = True
        authorities = []

    for auth_cn in authority_cn:
        ret = _x509_gen_ca(auth_cn,
                           authority_name,
                           HERE,
                           )
        if not is_list:
            return ret
        authorities.append(ret)
    return authorities


@multi_function
def get_certificate(cn,
                    authority_name,
                    authority_cn=None,
                    extra_domainnames=[],
                    type='server',
                    ):
    if isinstance(cn, list) and extra_domainnames:
        raise Exception('cn cannot be a list with extra_domainnames set')
    if not cn or authority_name is None:
        if isinstance(cn, list):
            return []
        return
    return _x509_gen_cert(cn,
                          extra_domainnames,
                          authority_cn,
                          authority_name,
                          type,
                          'crt',
                          HERE,
                          )


@multi_function
def get_private_key(cn,
                    authority_name=None,
                    authority_cn=None,
                    type='server',
                    ):
    if not cn:
        if isinstance(cn, list):
            return []
        return
    if authority_name is None:
        if _x509_has_pub(cn, HERE):
            return _x509_gen_pub(cn,
                                 'key',
                                 HERE,
                                 )
        if isinstance(cn, list):
            return []
        return
    return _x509_gen_cert(cn,
                          [],
                          authority_cn,
                          authority_name,
                          type,
                          'key',
                          HERE,
                          )


def get_public_key(cn):
    if not cn:
        return
    return _x509_gen_pub(cn,
                         'pub',
                         HERE,
                         )


def zone_information(zone_name: str,
                     type: str,
                     multi: bool=False,
                     index: int=None,
                     ) -> str:
    if not zone_name:
        return
    if type == 'gateway' and index != 0:
        return
    load_zones()
    if zone_name not in ZONES:
        raise ValueError(f"cannot get zone informations in unknown zone '{zone_name}'")
    zone = ZONES[zone_name]
    if type not in zone:
        raise ValueError(f"unknown type '{type}' in zone '{zone_name}'")
    value = zone[type]
    if multi:
        value = [value]
    return value


def get_internal_zones() -> List[str]:
    load_domains()
    return list(DOMAINS.keys())


@multi_function
def get_zones_info(type: str) -> str:
    ret = []
    for data in ZONES_SERVER['zones'].values():
        ret.append(data[type])
    return ret

@multi_function
def get_internal_zone_names() -> List[str]:
    load_zones()
    return list(ZONES.keys())


def get_internal_zone_information(zone: str,
                                  info: str,
                                  ) -> str:
    load_domains()
    if info == 'cidr':
        return ZONES[zone]['gateway'] + '/' + ZONES[zone]['network'].split('/')[-1]
    return ZONES[zone][info]


def get_internal_info_in_zone(zone: str,
                              auto: bool,
                              type: str,
                              index: int=None,
                              ) -> List[str]:
    if not auto:
        return
    for domain_name, domain in DOMAINS.items():
        if zone == domain_name:
            if type == 'host':
                return list(domain[0])
            else:
                return domain[1][index]

# =============================================================