# -*- coding: utf-8
#
# manage clientsdb.json

#import site packages
import json
import hmac
import bcrypt

#import local packages
import ioconfig
import utils

def addclient(vmid, vmname, clientid, clientname, clientemail, vmpass):
    """ add new client with the requested vm to the clientsdb.json """
    clientsdb = readclientsdb()

    if str(clientid) in clientsdb:
        ioconfig.logger.info('client[{}]> already exist. merging.'.format(clientid))
    else:
        ioconfig.logger.info('client[{}]> does not exist. creating...'.format(clientid))
        #generate password and send it to the client
        newpass = utils.genpassword(30)
        ioconfig.logger.info('client[{}]> initial password is: {}'.format(clientid, newpass))
        salt = bcrypt.gensalt()
        b_newpass = newpass.encode('ascii')
        encpasswd = bcrypt.hashpw(b_newpass, salt).decode('ascii')
        vcard = { 'name':str(clientname), 'email':str(clientemail), 'encpasswd':str(encpasswd), 'id':str(clientid) }
        newclient = { str(clientid):vcard }
        clientsdb.update(newclient)
        #Send initial email to the user as we will use the internal auth from now on.
        ###utils.sendmail(clientemail, '{} logged in.'.format)
        #TODO: Sync with proxmaster-admin database (shell command could be used for this one)
    ioconfig.logger.info('client[{}]> vmid {} is now owned by {} ({})'.format(clientid, vmid, clientemail, clientname))

    #create initial vm template
    vmdata = { 'hostname':str(vmname), 'vmid':str(vmid), 'ownerid':str(clientid) }
    clientsdb[str(clientid)][str(vmid)] = vmdata
    writeclientsdb(clientsdb)


def setencpasswd(clientemail, newpass):
    """ setup a new management password """
    salt = bcrypt.gensalt()
    b_newpass = newpass.encode('ascii')
    encpasswd = bcrypt.hashpw(b_newpass, salt).decode('ascii')

    try:
        clientsdb = readclientsdb()
        path = utils.get_path(clientsdb, clientemail)
        c_id = str(path[0])
        #check the returned path with forward query
        query = clientsdb[c_id]['email']
        #ioconfig.logger.info('client[{}]> path={}'.format(c_id, str(path)))
    except:
        ioconfig.logger.critical('clients> client {} not found'.format(clientemail))
        raise

    if query != clientemail:
        ioconfig.logger.critical('clients> test query returns different vmname! check clients db for consistency!')
        raise
    else:
        clientsdb[c_id]['encpasswd'] = encpasswd
        ioconfig.logger.info('client[{}]> {} password changed!'.format(c_id, clientemail))
        writeclientsdb(clientsdb)
        #TODO: Send new email to the client to notify the password change. This time sending the password in plain text is not needed. 


def checkin(clientid):
    """ return list of owned vmids if client id matches the client database. (logged-in users)"""
    #1. search for the client
    try:
        clientsdb = readclientsdb()
        c_id = clientsdb[str(clientid)]
        ioconfig.logger.info('client[{}]> checked in'.format(c_id))
        return c_id
    except:
        ioconfig.logger.error('clients> user id: {} could not be checked.'.format(clientid))
        return None


def validate(clientemail, password):
    """ return list of owned vmids if credentials match an user from the database. (fresh logins)"""
    #1. search for the client
    try:
        clientsdb = readclientsdb()
        path = utils.get_path(clientsdb, clientemail) 
        c_id = str(path[0])
    except:
        ioconfig.logger.error('clients> {} was not found in the database!'.format(clientemail))
        #log bad ips here...
        return None

    #2. check the password
    encpass = clientsdb[c_id]['encpasswd']
    b_srvpass = password.encode('ascii')
    b_encpass = encpass.encode('ascii')

    if (hmac.compare_digest(bcrypt.hashpw(b_srvpass, b_encpass), b_encpass)):
        #login successful
        ioconfig.logger.info('client[{}]> {} logged in successfully'.format(c_id, clientemail))
        #TODO: Notify admin    
        #3. generate vmlist to return the owned ids to the client.
        return clientvms(clientsdb[c_id])
    else:
        ioconfig.logger.warning('client[{}]> {} access denied!'.format(c_id, clientemail))
        #cant compare password
        #TODO: Log attempts and block.
        return None


def clientvms(vmlist):
    """ generate vmlist """
    response = {}
    for vmid,data in vmlist.items():
        response[vmid] = data
    return response


def vmowner(vmid, vmname, verbose):
    """ find the owner of the vm """
    clientsdb = readclientsdb()
    try:
        clientid = utils.find_rec(clientsdb, str(vmid))[0]['ownerid']
        clientname = clientsdb[str(clientid)]['name']
    except:
        raise
        clientid = '0' #unknown owner
        clientname = 'unknown'
    if verbose:
        ioconfig.logger.info('client[{}]> {} is the owner of {} ({})'.format(str(clientid), clientname, str(vmid), vmname))
    return clientid


def readclientsdb():
    """ read client db """
    try:
        with open('clients.json') as dbr:
            clientsdb = json.load(dbr)
        dbr.close()
    except:
        clientsdb = {}
        ioconfig.logger.warning('clients> initializing...')
        #writeclientsdb(clientsdb)
    return clientsdb


def writeclientsdb(clientsdb):
    """ write db """
    with open('clients.json', 'w') as dbw:
        json.dump(clientsdb, dbw)
    dbw.close()


if __name__ == '__main__':
    setencpasswd('abc@xyz.com', 'todos')