#!/usr/bin/env python3

# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you 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.

import sys

from teaclave import FunctionArgument
from utils import USER_ID, USER_PASSWORD, connect_authentication_service, connect_frontend_service, PlatformAdmin


class MesaPyEchoExample:

    def __init__(self, user_id, user_password):
        self.user_id = user_id
        self.user_password = user_password

    def echo(self,
             payload_file="mesapy_echo_payload.py",
             message="Hello, Teaclave!"):
        with connect_authentication_service() as client:
            print(f"[+] {self.user_id} login")
            token = client.user_login(self.user_id, self.user_password)

        client = connect_frontend_service()
        metadata = {"id": self.user_id, "token": token}
        client.metadata = metadata

        print("[+] registering function")

        with open(payload_file, "rb") as f:
            payload = f.read()
        function_id = client.register_function(
            name="mesapy-echo",
            description="An echo function implemented in Python",
            executor_type="python",
            payload=list(payload),
            arguments=[FunctionArgument("message")])

        print("[+] creating task")
        task_id = client.create_task(function_id=function_id,
                                     function_arguments={"message": message},
                                     executor="mesapy")

        print("[+] invoking task")
        client.invoke_task(task_id)

        print("[+] getting result")
        result = client.get_task_result(task_id)
        print("[+] done")
        client.close()

        return bytes(result)


def main():
    example = MesaPyEchoExample(USER_ID, USER_PASSWORD)
    if len(sys.argv) == 2:
        message = sys.argv[1]
        rt = example.echo(message=message)
    elif len(sys.argv) == 3:
        payload = sys.argv[1]
        message = sys.argv[2]
        rt = example.echo(payload, message)
    else:
        rt = example.echo()

    print("[+] function return: ", rt)


if __name__ == '__main__':
    main()