import etcd

from helper import check_otp, get_next_id
from flask import Flask
from flask_restful import Resource, Api, reqparse
from decouple import config
from enums import VmStatus

app = Flask(__name__)
api = Api(app)

etcd_client = etcd.Client(host=config("ETCD_HOST"), port=int(config("ETCD_PORT")))
etcd_lock = etcd.Lock(etcd_client, 'etcd_lock')

createvm_argparser = reqparse.RequestParser()
createvm_argparser.add_argument("name", type=str, required=True)
createvm_argparser.add_argument("realm", type=str, required=True)
createvm_argparser.add_argument("seed", type=str, required=True)
createvm_argparser.add_argument("specs", type=dict, required=True)


class CreateVM(Resource):
    def post(self):
        createvm_args = createvm_argparser.parse_args()
        name, realm, seed, specs = createvm_args.name, createvm_args.realm,\
                                   createvm_args.seed, createvm_args.specs

        if check_otp(name, realm, seed) == 200:
            # User is good

            # Block until lock is acquired. There is no timeout associated with this lock.
            with etcd_lock:
                next_vm_id = get_next_id(etcd_client, "/v1/vm/")

                vm_entry = {"owner": name,
                            "specs": specs,
                            "status": VmStatus.REQUESTED_NEW}

                etcd_client.write(f"/v1/vm/{next_vm_id}", vm_entry)

            return {'message': "VM Creation Queued"}, 200
        else:
            return {'message': 'Invalid Credentials'}, 400


api.add_resource(CreateVM, '/vm/create')

if __name__ == '__main__':
    app.run(debug=True)