#!/usr/bin/env python

# kpov_util should be imported by add_assignment.py
# TODO: finish this.
instructions = {
    'si':"""
Naloga: Postavi tri navidezne racunalnike: 
- SimpleArbiter s sliko diska simpleArbiterDhcpGW,
- SNMPServer in 
- SNMPClient. 
Napiši program upminutes, ki bo izpisal v minutah koliko casa je racunalnik 
vklopljen.

Postavi ga na SNMPClient v domaci imenik uporabnika test z geslom test. 

Poskrbi, da bo SNMP strežnik prek SNMP pod 
OID {SNMP_UPTIME_OID} sporočal, koliko casa je vklopljen 
v sekundah.

Napiši skripto, poimenovano beri.sh, ki prek SNMP prebere vrednost s 
simpleArbiterDhcpGWSNMP na OID {SNMP_CLIENT_OID} kot član skupnosti
"testers".

Postavi jo na SNMP klienta, v domaci imenik uporabnika test z geslom test.

Poskrbi, da bodo podatki na SNMPServer dostopni za skupino (community) studentje.
""",
    'en':"""
Set up three virtual computers, SimpleArbiter with the disk image simpleArbiterDhcp,
SNMPServer and SNMPClient. Write a program called upminutes. This program should output
the uptime of the computer in minutes. Set it up on SNMPClient in the home directory
of the user test with the password test.

Make sure that the SNMP server reports it's uptime in seconds over SNMP under 
OID {SNMP_UPTIME_OID}.

Write a script called beri.sh that reads the value from the OID
{SNMP_CLIENT_OID} on simpleArbiterDhcpGWSNMP as a member of the
community "testers". 
Set it up on SNMPClient in the home directory of the user test.

Make all the data available over SNMP readable by the "studentje" community.
"""

}


computers = {
    'SNMPClient': {
        'disks': [
            {   'name': 'student-SNMPClient',

            },
            #{   'name': 'CDROM',
            #    'options':{'readonly': True},
            #    'parts': [],# no parts, no mounting.
            #}
        ],
        'network_interfaces': [{'network': 'net1'}],
        'flavor': 'm1.tiny',
        'config_drive': False
    },
    'SNMPServer': {
        'disks': [
            {   'name': 'student-SNMPServer',
            },
            #{   'name': 'CDROM',
            #    'options':{'readonly': True},
            #    'parts': [],# no parts, no mounting.
            #}
        ],
        'network_interfaces': [{'network': 'net1'}],
        'flavor': 'm1.tiny',
        'config_drive': False

    },
 
    'SimpleArbiter': {
        'disks': [
            {   'name': 'simpleArbiterDhcpGWSNMP',
                # attempt automount
            },
            #{   'name': 'CDROM',
            #    'options': {'readonly': True},
            #    'parts': [{'dev': 'b1', 'path': '/cdrom'}],
            #},
        ],
        'network_interfaces': [{'network': 'net1'}, {'network': 'test-net'}],
        'flavor': 'm1.tiny',
        'config_drive': False
    }
}

networks = { 'net1': {'public': False}, 'test-net': {'public': True} }

params_meta = {
    'SNMP_VALUE': {'descriptions': {'si': 'Vrednost, dostopna prek SNMP', 'en': 'The value available over SNMP'}, 'w': False, 'public':False, 'type': 'short', 'generated': True}, 
    'SNMP_UPTIME_OID': {'descriptions': {'si': 'SNMP_UPTIME_OID (za uptime)', 'en': 'SNMP_UPTIME_OID (for the uptime)'}, 'w': False, 'public':True, 'type': 'str', 'generated': True}, 
    'SNMP_CLIENT_OID': {'descriptions': {'si': 'SNMP_CLIENT_OID, ki naj ga klient bere', 'en':'The OID that the client should read'}, 'w': False, 'public':True, 'type': 'OID', 'generated': True}, 
    'SERVER_IP': {'descriptions': {'si': 'IP SNMP strežnika', 'en':'IP of the SNMP server'}, 'w': True, 'public':True, 'type': 'IP', 'generated': False}, 
    'CLIENT_IP': {'descriptions': {'si': 'IP SNMP klienta', 'en': 'IP of the SNMP client'}, 'w': True, 'public':True, 'type': 'IP', 'generated': False}, 

}

def task(SERVER_IP, CLIENT_IP, SNMP_UPTIME_OID, SNMP_CLIENT_OID):
    #<== Aleksander Fujs 6310020 ==>
    # TODO popravi IPje
    import netsnmp
    import paramiko
    from paramiko import SSHClient
    return_results = {}

    client = SSHClient()
    client.load_system_host_keys()
    client.set_missing_host_key_policy(paramiko.AutoAddPolicy())

    client.connect(SERVER_IP, username='student', password='vaje')
    stdin, stdout, stderr = client.exec_command('uptime=$(</proc/uptime); uptime=${uptime%%.*}; echo $uptime')
    return_results['server_uptime'] = stdout.read()

    try:
        session = netsnmp.Session(DestHost=SERVER_IP, Version=2, Community='studentje')
        # results_objs = netsnmp.VarList(netsnmp.Varbind(SNMP_UPTIME_OID)) #117.112.116.105.109.101  <-uptime
        results_objs = netsnmp.VarList(netsnmp.Varbind('.1.3.6.1.4.1.8072.1.3.2.4.1.2')) #117.112.116.105.109.101  <-uptime
        session.walk(results_objs)
        result_list = []
        for result in results_objs:
            result_list.append('{}.{}: {}'.format(
                result.tag, result.iid, result.val))
        return_results['server_OID'] = "\n".join(result_list)
    except Exception as exception_error:
            # Check for errors and print out results
        print(('ERROR: Occurred during SNMPget for OID %s from %s: '
                   '(%s)') % (SNMP_UPTIME_OID, CLIENT_IP, exception_error))
        sys.exit(2)
 
    client.connect(CLIENT_IP, username='test', password='test')
    stdin, stdout, stderr = client.exec_command('uptime=$(</proc/uptime); uptime=${uptime%%.*}; echo $(( uptime ))')
    return_results['client_uptime'] = stdout.read()
    # zakaj bi morala biti ravno bash skripta?
    stdin, stdout, stderr = client.exec_command('/home/test/upminutes')
    #TODO preverit da ni v skripti hardcodan
    return_results['client_script'] = stdout.read()

    stdin, stdout, stderr = client.exec_command('/home/test/beri.sh')
    return_results['client_script2'] = stdout.read()
    #TODO add 3 part of assigement
    return return_results
    #<== Aleksander Fujs 6310020 ==>

    
def gen_params(user_id, params_meta):
    import random
    params = dict()
    r = random.Random(user_id)
    # You can also create an OID creation function in kpov_util.
    # this should probably return params_meta

    #<== Aleksander Fujs 6310020 ==>
    params['SNMP_VALUE'] = kpov_util.alnum_gen(r, 64)
    params['SNMP_UPTIME_OID'] = 'NET-SNMP-EXTEND-MIB::nsExtendOutLine."{}".1'.format(
        kpov_util.hostname_gen(r))
    params['SNMP_CLIENT_OID'] = '1.3.6.1.4.1.8072.2.9999.9999.{}'.format(
	    r.randint(0, 255))
    #<== Aleksander Fujs 6310020 ==>

    return params

def task_check(results, params):
    #TODO improve regex
    import re
    score = 0
    hints = []
    client_script_uptime = int(results['client_script'].strip())
    client_uptime = int(results['client_uptime'].strip())
    d = client_uptime - client_script_uptime*60
    if d >= 0 and d < 62:
        score += 3
    else:
        hints += ["client uptime script output wrong."]
    server_uptime = int(results['server_uptime'].strip())
    lines = results['server_OID'].split('\n')
    unique_part_start = params['SNMP_UPTIME_OID'].find('"')
    unique_part_end = params['SNMP_UPTIME_OID'].find('"', unique_part_start+1)
    unique_part = params['SNMP_UPTIME_OID'][unique_part_start+1:unique_part_end]
    server_oid = 'iso.3.6.1.4.1.8072.1.3.2.4.1.2.{}.'.format(len(unique_part))
    server_oid += '.'.join([str(ord(i)) for i in unique_part]) + '.1.'
    found_uptime = False
    for line in lines:
        try:
            oid, uptime_s = line.split(':')
            d = server_uptime - int(uptime_s.strip())
            if oid.strip() == server_oid and d >= -2 and d <= 5:
                found_uptime = True
                break
        except Exception as e:
            pass
    if len(lines) <= 50 and found_uptime:
        score += 3
    else:
        hints += ["Uptime not found in server's MDB"]
    if results['client_script2'].find(params['SNMP_VALUE']) >= 0:
        score += 4
    else:
        hints += ["beri.sh not working properly"]
    return score, hints

def prepare_disks(templates, task_params, global_params):
#    d = templates['simpleArbiterDhcp']
    prog = """#!/usr/bin/python
import sys
action = sys.argv[1]
oid = sys.argv[2]

foo_oid = ".{oid}"
foo_oid_start = foo_oid[:foo_oid.rfind('.')]
foo_oid_end = foo_oid[len(foo_oid_start)+1:]
oid_end = oid[len(foo_oid_start)+1:]
oid_start = oid[:len(foo_oid_start)]

if action == '-n' and (
            (oid_start == foo_oid_start) and (
                (len(oid_end) == 0) or (int(oid_end) < int(foo_oid_end))
            )
        ):
    oid = foo_oid

if action != '-s' and oid == foo_oid:
    print foo_oid
    print "string"
    print "{val}"
""".format(oid = task_params['SNMP_CLIENT_OID'], val = task_params['SNMP_VALUE'])
    templates['simpleArbiterDhcpGWSNMP'].write('/usr/local/bin/snmpext.py', prog)
    templates['simpleArbiterDhcpGWSNMP'].chmod(0o755, '/usr/local/bin/snmpext.py')
    write_default_config(templates['simpleArbiterDhcpGWSNMP'], global_params)