import socket
import sys

import array

import struct
from cc.database import mongo

__author__ = 'Barak'


# data structures

def creds_add_username(username):
    mongo.db.usernames.update(
        {'username': username},
        {'$inc': {'count': 1}},
        upsert=True
    )


def creds_add_password(password):
    mongo.db.passwords.update(
        {'password': password},
        {'$inc': {'count': 1}},
        upsert=True
    )


def init_collections(usernames, passwords):
    if "usernames" not in mongo.db.collection_names():
        mongo.db.usernames.create_index([("username", 1)], unique=True)
        for username in usernames:
            creds_add_username(username)

    if "passwords" not in mongo.db.collection_names():
        mongo.db.passwords.create_index([("password", 1)], unique=True)
        for password in passwords:
            creds_add_password(password)


# Local ips function
if sys.platform == "win32":
    def local_ips():
        local_hostname = socket.gethostname()
        return socket.gethostbyname_ex(local_hostname)[2]
else:
    import fcntl
    def local_ips():
        result = []
        try:
            is_64bits = sys.maxsize > 2 ** 32
            struct_size = 40 if is_64bits else 32
            s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
            max_possible = 8  # initial value
            while True:
                struct_bytes = max_possible * struct_size
                names = array.array('B', '\0' * struct_bytes)
                outbytes = struct.unpack('iL', fcntl.ioctl(
                    s.fileno(),
                    0x8912,  # SIOCGIFCONF
                    struct.pack('iL', struct_bytes, names.buffer_info()[0])
                ))[0]
                if outbytes == struct_bytes:
                    max_possible *= 2
                else:
                    break
            namestr = names.tostring()

            for i in range(0, outbytes, struct_size):
                addr = socket.inet_ntoa(namestr[i + 20:i + 24])
                if not addr.startswith('127'):
                    result.append(addr)
                    # name of interface is (namestr[i:i+16].split('\0', 1)[0]
        finally:
            return result
# End of local ips function