#!/usr/bin/env python
################################################################################
# Copyright 2021 highstreet technologies GmbH
#
# Licensed under the Apache License, Version 2.0 (the 'License');
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an 'AS IS' BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#

# importing the sys, json, requests library
import os
import sys
import json
import time
import getpass
import requests
import warnings
from jproperties import Properties
from typing import List
warnings.filterwarnings('ignore', message='Unverified HTTPS request')
# global configurations


def get_environment_variable(name):
    configs = Properties()
    env_file = os.path.dirname(os.path.abspath(__file__)) + '/' + '../' + '.env'
    with open(env_file, "rb") as read_prop:
        configs.load(read_prop)
    return configs.get(name).data


def load_arguments(args: List[str]) -> tuple:
    realm_file = os.path.dirname(os.path.abspath(
        __file__)) + '/o-ran-sc-realm.json'
    auth_file = os.path.dirname(os.path.abspath(
        __file__)) + '/authentication.json'
    ready_timeout = 180
    args.pop(0)
    while len(args) > 0:
        arg = args.pop(0)
        if arg == '--auth' and len(args) > 0:
            auth_file = args.pop(0)
            print('overwriting auth file: {}'.format(auth_file))
        elif arg == '--realm' and len(args) > 0:
            realm_file = args.pop(0)
            print('overwriting realm file: {}'.format(realm_file))
        elif arg == '--timeout' and len(args) > 0:
            ready_timeout = int(args.pop(0))
            print('waiting for ready {} seconds'.format(ready_timeout))

    return (realm_file, auth_file, ready_timeout)


def isReady(timeoutSeconds=180):
    url = getBaseUrl()
    while timeoutSeconds > 0:
        try:
            response = requests.get(url, verify=False, headers={})
        except:
            pass
        if response is not None and response.status_code == 200:
            return True
        time.sleep(1)
        timeoutSeconds -= 1
    return False


def getBaseUrl():
    return get_environment_variable("IDENTITY_PROVIDER_URL")

# Request a token for further communication
def getToken():
    url = base + '/realms/master/protocol/openid-connect/token'
    headers = {
        'content-type': 'application/x-www-form-urlencoded',
        'accept': 'application/json'
    }
    body = {
        'client_id': 'admin-cli',
        'grant_type': 'password',
        'username': username,
        'password': password
    }
    try:
        response = requests.post(url, verify=False, auth=(
            username, password), data=body, headers=headers)
    except requests.exceptions.Timeout:
        sys.exit('HTTP request failed, please check you internet connection.')
    except requests.exceptions.TooManyRedirects:
        sys.exit('HTTP request failed, please check your proxy settings.')
    except requests.exceptions.RequestException as e:
        # catastrophic error. bail.
        raise SystemExit(e)

    if response.status_code >= 200 and response.status_code < 300:
        print('Got token!')
        return response.json()['access_token']
    else:
        sys.exit('Getting token failed.')

# create the default realm from file


def createRealm(token, realm):
    url = base + '/admin/realms'
    auth = 'bearer ' + token
    headers = {
        'content-type': 'application/json',
        'accept': 'application/json',
        'authorization': auth
    }
    try:
        response = requests.post(
            url, verify=False, json=realm, headers=headers)
    except requests.exceptions.Timeout:
        sys.exit('HTTP request failed, please check you internet connection.')
    except requests.exceptions.TooManyRedirects:
        sys.exit('HTTP request failed, please check your proxy settings.')
    except requests.exceptions.RequestException as e:
        # catastrophic error. bail.
        raise SystemExit(e)

    return response.status_code >= 200 and response.status_code < 300

# Check if default realm exists


def checkRealmExists(token, realmId):
    url = base + '/admin/realms/' + realmId
    auth = 'bearer ' + token
    headers = {
        'accept': 'application/json',
        'authorization': auth
    }
    try:
        response = requests.get(url, verify=False, headers=headers)
    except requests.exceptions.Timeout:
        sys.exit('HTTP request failed, please check you internet connection.')
    except requests.exceptions.TooManyRedirects:
        sys.exit('HTTP request failed, please check your proxy settings.')
    except requests.exceptions.RequestException as e:
        # catastrophic error. bail.
        raise SystemExit(e)

    if response.status_code >= 200 and response.status_code < 300:
        return realmId == response.json()['id']
    else:
        # sys.exit('Getting realm failed.')
        return False

# create a user in default realm


def createUser(token, realmConfig, user):
    realmId = realmConfig['id']
    url = base + '/admin/realms/' + realmId + '/users'
    auth = 'bearer ' + token
    headers = {
        'accept': 'application/json',
        'authorization': auth
    }
    try:
        response = requests.post(url, verify=False, json=user, headers=headers)
    except requests.exceptions.Timeout:
        sys.exit('HTTP request failed, please check you internet connection.')
    except requests.exceptions.TooManyRedirects:
        sys.exit('HTTP request failed, please check your proxy settings.')
    except requests.exceptions.RequestException as e:
        # catastrophic error. bail.
        raise SystemExit(e)

    if response.status_code >= 200 and response.status_code < 300:
        print('User', user['username'], 'created!')
    else:
        print('User creation', user['username'], 'failed!\n', response.text)

# creates User accounts in realm based a file


def createUsers(token, realmConfig, authConfig):
    for user in authConfig['users']:
        createUser(token, realmConfig, user)

    # create a user based on system user
    systemUser = {
        "firstName": getpass.getuser(),
        "lastName": "",
        "email": getpass.getuser() + "@sdnr.onap.org",
        "enabled": "true",
        "username": getpass.getuser(),
        "credentials": [
            {
                "type": "password",
                "value": password,
                "temporary": False
            }
        ]
    }
    createUser(token, realmConfig, systemUser)

# Grants a role to a user


def addUserRole(user: dict, role: dict, options: dict):
    url = options['url'] + '/' + user['id'] + '/role-mappings/realm'
    try:
        response = requests.post(url, verify=False, json=[
                                 {'id': role['id'], 'name':role['name']}], headers=options['headers'])
    except requests.exceptions.Timeout:
        sys.exit('HTTP request failed, please check you internet connection.')
    except requests.exceptions.TooManyRedirects:
        sys.exit('HTTP request failed, please check your proxy settings.')
    except requests.exceptions.RequestException as e:
        # catastrophic error. bail.
        raise SystemExit(e)

    if response.status_code >= 200 and response.status_code < 300:
        print('User role', user['username'], role['name'], 'created!')
    else:
        print('Creation of user role',
              user['username'], role['name'], 'failed!\n', response.text)

# searches for the role of a given user


def findRole(username: str, authConfig: dict, realmConfig: dict) -> dict:
    roleName = 'administration'
    for grant in authConfig['grants']:
        if grant['username'] == username:
            roleName = grant['role']
    for role in realmConfig['roles']['realm']:
        if role['name'] == roleName:
            return role
    return None

# adds roles to users


def addUserRoles(token, realmConfig, authConfig):
    realmId = realmConfig['id']
    url = base + '/admin/realms/' + realmId + '/users'
    auth = 'bearer ' + token
    headers = {
        'content-type': 'application/json',
        'accept': 'application/json',
        'authorization': auth
    }
    try:
        response = requests.get(url, verify=False, headers=headers)
    except requests.exceptions.Timeout:
        sys.exit('HTTP request failed, please check you internet connection.')
    except requests.exceptions.TooManyRedirects:
        sys.exit('HTTP request failed, please check your proxy settings.')
    except requests.exceptions.RequestException as e:
        # catastrophic error. bail.
        raise SystemExit(e)

    if response.status_code >= 200 and response.status_code < 300:
        users = response.json()
        options = {
            "url": url,
            "auth": auth,
            "headers": headers
        }
        for user in users:
            role = findRole(user['username'], authConfig, realmConfig)
            addUserRole(user, role, options)
    else:
        sys.exit('Getting users failed.')

# main


(realmFile, authFile, readyTimeout) = load_arguments(sys.argv)
username = get_environment_variable('ADMIN_USERNAME')
password = get_environment_variable('ADMIN_PASSWORD')
base = getBaseUrl()
isReady(readyTimeout)
token = getToken()
if token:
    with open(realmFile) as file:
        realmConfig = json.load(file)
        if not checkRealmExists(token, realmConfig['id']):
            createRealm(token, realmConfig)

        with open(authFile) as authConfig:
            authConfig = json.load(authConfig)
            createUsers(token, realmConfig, authConfig)
        addUserRoles(token, realmConfig, authConfig)
    exit(0)
exit(1)