import os
import exceptions
import requests
import json
import redis
import ng_openstack.settings as settings


appDebug = True

def getToken(username, password, authDomain, scopeDomain, scopeProject):

    try:
        return lookupTokenFromRedis(username, authDomain, scopeDomain, scopeProject)
    except exceptions.ItemNotFoundError:

        url = os.getenv("OS_AUTH_URL") + '/auth/tokens'
        xdata = {
              "auth": {
                "scope": {
                  "project": {
                    "domain": {
                      "name": scopeDomain
                    },
                    "id": scopeProject
                  }
                },
                "identity": {
                  "password": {
                    "user": {
                      "domain": {
                        "name": authDomain
                      },
                      "password": password,
                      "name": username
                    }
                  },
                  "methods": [
                    "password"
                  ]
                }
              }
            }

        response = requests.post(url)
        #print(xdata)
        headers = {'Content-type': 'application/json'}
        #if appDebug: print(url)

        response = requests.post(url, headers=headers,
                                 data=json.dumps(xdata),
                                 verify=False,
                                 timeout=4)

        if response.status_code == 201:
            saveTokenToRedis(username, authDomain, scopeDomain, scopeProject, response.headers['X-Subject-Token'])
            return response.headers['X-Subject-Token']
        else:
            raise ValueError("Error in token response to token request:"+response.text)


def lookupTokenFromRedis(username, authDomain, scopeDomain, scopeProject):

    REDIS=redis.Redis()

    REDIS = redis.Redis(
            host=os.getenv("REDIS_HOST"),
            port=6379,
            password="")
    RedisKey= "OpenstackToken_" + username + "_" + authDomain + "_" + scopeDomain + "_" + scopeProject
    try:
        if REDIS.exists(RedisKey):
            #print("Got token from redis")
            token=REDIS.get(RedisKey).decode("utf-8")
            return token
        else:
            raise exceptions.ItemNotFoundError("OpenstackToken not found in redis")
    except:
        raise exceptions.ItemNotFoundError("OpenstackToken not found in redis")

def saveTokenToRedis(username, authDomain, scopeDomain, scopeProject,token):

    REDIS=redis.Redis()

    REDIS = redis.Redis(
            host=os.getenv("REDIS_HOST"),
            port=6379,
            password="")
    RedisKey = "OpenstackToken_" + username + "_" + authDomain + "_" + scopeDomain + "_" + scopeProject
    Token_CacheTimeout=150
    # print("Saving Token to redis with a {} second timeout".format(Token_CacheTimeout))
    try:
        REDIS.set(RedisKey,token)
        REDIS.expire(RedisKey, Token_CacheTimeout)
        return
    except:
        raise exceptions.ItemNotFoundError("OpenstackToken not saved in redis")