import csv
import hashlib
import random
import time

import firebase_admin
from firebase_admin import auth
from firebase_admin import credentials
from firebase_admin import db


PASS_CHARS = '2345679ABCDEFGHKMNPQRSTUVWXYZabcdefghkmnopqrstuvwxyz'
EMPRENDE_COURSES = {
    'courses-31c2bfb6-d5f1-4a25-992d-a62f655f2868': True,
    'courses-89eaf102-eb52-405f-b04b-0b0dd2fc4dbd': True
}

cred = credentials.Certificate('./ime-bedu-firebase-adminsdk.json')
firebase_admin.initialize_app(cred, {
    'databaseURL': '//db_url/'
})


def gen_password(len=8):
    return ''.join(random.choice(PASS_CHARS) for _ in range(len))


def create_user(user_data):
    user_pass = gen_password()
    user = auth.create_user(
        email=user_data['email'], password=user_pass, disabled=False)
    return (user, user_pass)


def delete_user(uid):
    auth.delete_user(uid)


def generate_profile(firbase_user):
    user_ref = db.reference('profiles/{}/courses/'.format(firbase_user.uid))
    user_ref.set(EMPRENDE_COURSES)


if __name__ == '__main__':
    import sys

    _hash = hashlib.sha256()
    _hash.update(str(time.time()).encode('utf-8'))
    output_file_name = 'output-{}.csv'.format(_hash.hexdigest()[:10])
    output_file = open(output_file_name, 'w+')
    headers = ['email', 'password', 'status']
    csv_writer = csv.DictWriter(output_file, fieldnames=headers)
    csv_writer.writeheader()

    for file in sys.argv[1:]:
        with open(file) as csv_file:
            reader = csv.DictReader(csv_file)
            for row in reader:
                try:
                    user, password = create_user(row)
                except (auth.AuthError, ValueError) as e:
                    csv_writer.writerow(
                        dict(zip(headers, (user.email, 'n/a', e))))
                    continue
                try:
                    generate_profile(user)
                    csv_writer.writerow(
                        dict(zip(headers, (user.email, password, 'ok'))))
                except Exception as e:
                    csv_writer.writerow(
                        dict(zip(headers, (user.email, 'n/a', e))))

    output_file.close()