#!/usr/bin/env python3
from data.database import *
from datetime import datetime, timedelta
import config
import getpass
import hashlib
import os
import os.path
import shutil
import sys
import redis
import random
import utils
import utils.admin
import utils.misc
import yaml
import argparse
import logging

tables = [Team, User, UserAccess, Stage, Challenge, ChallengeSolve, ChallengeFailure, NewsItem, TroubleTicket, TicketComment, Notification, ScoreAdjustment, AdminUser, SshAccount]

def create_tables(args):
    check = True
    if args.fail:
        check = False
    [i.create_table(check) for i in tables]
    print("Tables created")

def drop_tables(args):
    if input("Are you sure? Type yes to continue: ") == "yes":
        [i.drop_table() for i in tables]
        print("Done")
    else:
        print("Okay, nothing happened.")




def gen_team(args):
    n = args.team_count
    chals = list(Challenge.select())
    ctz = datetime.now()
    diff = timedelta(minutes=5)
    for i in range(n):
        name = "Team {} {}".format(i + 1, utils.misc.generate_random_string(length=5))
        team_key = utils.misc.generate_team_key()
        t = Team.create(name=name, affiliation="Autogenerated", key=team_key)
        username = "username{}".format(i+1)
        user = User.create(username=username, email="nope@nope.nope",
                           background="university", country="ISL",
                           tshirt_size="XL", gender="M",
                           email_confirmation_key="autogen", email_confirmed=True,
                           team=t)
        t.save()
        password = "password{}".format(user.id)
        user.set_password(password)
        user.save()
        print("Team added with id {}".format(t.id))
        print("User added with username {} and password {}".format(username, password))

def add_admin(args):
    username = input("Username: ")
    password = getpass.getpass().encode()
    pwhash = utils.admin.create_password(password)
    r = random.SystemRandom()
    secret = "".join([r.choice("ABCDEFGHIJKLMNOPQRSTUVWXYZ234567") for i in range(16)])
    AdminUser.create(username=username, password=pwhash, secret=secret)
    print("AdminUser created; Enter the following key into your favorite TOTP application (Google Authenticator Recommended): {}".format(secret))
def scan_challenges_problem(d, files):
    staticpaths = {}
    if "static.yml" in files:
        with open(os.path.join(d, "static.yml")) as f:
            statics = yaml.load(f)
            for static in statics:
                h = hashlib.sha256()
                with open(os.path.join(d, static), "rb") as staticfile:
                    while True:
                        buf = staticfile.read(4096)
                        h.update(buf)
                        if not buf:
                            break

                if "." in static:
                    name, ext = static.split(".", maxsplit=1)
                    fn = "{}_{}.{}".format(name, h.hexdigest(), ext)
                else:
                    fn = "{}_{}".format(static, h.hexdigest())
                staticpaths[static] = fn
                shutil.copy(os.path.join(d, static), os.path.join(config.static_dir, fn))
                print(fn)

    with open(os.path.join(d, "problem.yml")) as f:
        data = yaml.load(f)
        print("Inserting problem in directory %s" % (d))
        for i in staticpaths:
            print("looking for |{}|".format(i))
            data["description"] = data["description"].replace("|{}|".format(i), "{}{}".format(config.static_prefix, staticpaths[i]))

        data["stage"] = Stage.get(Stage.alias == data["stage"])
        query = Challenge.select().where(Challenge.alias == data["alias"])
        if query.exists():
            print("Updating " + str(data["name"]) + "...")
            q = Challenge.update(**data).where(Challenge.alias == data["alias"])
            q.execute()
        else:
            Challenge.create(**data)


def scan_challenges_stage(d, files):

    with open(os.path.join(d, "stage.yml")) as f:
        data = yaml.load(f)
        query = Stage.select().where(Stage.alias == data["alias"])
        if query.exists():
            print("Updating %s..." % (data["alias"]))
            q = Stage.update(**data).where(Stage.alias == data["alias"])
            q.execute()
        else:
            Stage.create(**data)


def scan_challenges(args):
    path = args.path
    n = 0

    os.makedirs(config.static_dir, exist_ok=True)
    for root, dirs, files in os.walk(path):
        if "problem.yml" in files:
            n += 1
            scan_challenges_problem(root, files)
        if "stage.yml" in files:
            scan_challenges_stage(root, files)

    print(n, "challenges loaded")


def add_challenge(args):
    challengefile = args.file
    with open(challengefile) as f:
        chal = Challenge.create(**yaml.load(f))
        print("Challenge added with id {}".format(chal.id))

def gen_challenges(args):
    n = args.challenge_count
    for i in range(n):
        name = str(random.randint(0, 999999999))
        chal = Challenge.create(name="Challenge {}".format(name), category="Generated", description="Lorem ipsum, dolor sit amet. The flag is {}".format(name), points=random.randint(50, 400), flag=name, author="autogen")
        print("Challenge added with id {}".format(chal.id))



def list_challenges(args):
    for chal in Challenge.select():
        print("{}  {}".format(str(chal.id).rjust(3), chal.name))


def del_challenge(args):
    id = args.id
    c = Challenge.get(id=id)
    ChallengeFailure.delete().where(ChallengeFailure.challenge == c).execute()
    ChallengeSolve.delete().where(ChallengeSolve.challenge == c).execute()
    c.delete_instance()

def clear_challenges(args):
    ChallengeFailure.delete().execute()
    ChallengeSolve.delete().execute()
    Challenge.delete().execute()


def recache_solves(args):
    r = redis.StrictRedis(host=config.redis.host, port=config.redis.port, db=config.redis.db)
    for chal in Challenge.select():
        r.hset("solves", chal.id, chal.solves.count())
    print(r.hvals("solves"))

def main():
    parser = argparse.ArgumentParser(description="{} problem manager".format(config.ctf_name))
    debug_level = parser.add_mutually_exclusive_group()
    debug_level.add_argument('-v', '--verbose', help="Print intermediate results", action="store_true")
    debug_level.add_argument('-s', '--silent', help="Print out very little", action="store_true")
    subparser = parser.add_subparsers(help='Select one of the following actions')

    # Problems
    parser_problems = subparser.add_parser('challenges', help='Deal with challenges')
    subparser_problems = parser_problems.add_subparsers(help='Select one of the following actions')

    parser_problems_scan = subparser_problems.add_parser('scan', help='Scan a path for problems')
    parser_problems_scan.add_argument("path", help="Directory for the path")
    parser_problems_scan.set_defaults(func=scan_challenges)

    parser_problems_generate = subparser_problems.add_parser('generate', help='Generate some dummy problems')
    parser_problems_generate.add_argument("challenge_count", type=int, help="number of problems to generate")
    parser_problems_generate.set_defaults(func=gen_challenges)

    parser_problems_add = subparser_problems.add_parser('add', help='add a problem')
    parser_problems_add.add_argument("file", help="file to use")
    parser_problems_add.set_defaults(func=add_challenge)

    parser_problems_list = subparser_problems.add_parser('list', help='List problems in the database')
    parser_problems_list.set_defaults(func=list_challenges)

    parser_problems_del = subparser_problems.add_parser('del', help='Delete a problem')
    parser_problems_del.add_argument('id', help="ID of problem to remove")
    parser_problems_del.set_defaults(func=del_challenge)

    parser_problems_clear = subparser_problems.add_parser('clear', help='Delete a problem')
    parser_problems_clear.set_defaults(func=clear_challenges)


    # Database
    parser_database = subparser.add_parser("database", help="Deal with database")
    subparser_database = parser_database.add_subparsers(help="Select one of the following actions")

    parser_database_create = subparser_database.add_parser("create-tables", help="create tables")
    parser_database_create.add_argument("-f", "--fail", help="Do not check if tables exist", action="store_true")
    parser_database_create.set_defaults(func=create_tables)

    parser_database_clear = subparser_database.add_parser("drop-tables", help="drop tables")
    parser_database_clear.set_defaults(func=drop_tables)

    parser_database_recache_solves = subparser_database.add_parser("recache-solves", help="recache solves")
    parser_database_recache_solves.set_defaults(func=recache_solves)

    # Users
    parser_user = subparser.add_parser("users", help="Deal with users")
    subparser_users = parser_user.add_subparsers(help="Select one of the following actions")

    parser_users_generate = subparser_users.add_parser('generate', help='Generate some dummy teams')
    parser_users_generate.add_argument("team_count", type=int, help="number of teams to generate")
    parser_users_generate.set_defaults(func=gen_team)

    parser_users_admin = subparser_users.add_parser('add-admin', help='Create a new administrator')
    parser_users_admin.set_defaults(func=add_admin)

    args = parser.parse_args()
    if args.silent:
        logging.basicConfig(level=logging.CRITICAL, stream=sys.stdout)
    elif args.verbose:
        logging.basicConfig(level=logging.DEBUG, stream=sys.stdout)
    else:
        logging.basicConfig(level=logging.WARNING, stream=sys.stdout)

    if 'func' in args:
        args.func(args)
    else:
        parser.print_help()

main()

# vim: syntax=python:ft=python