# Copyright 2018 Espressif Systems (Shanghai) PTE LTD
#
# 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.
#

# APIs for interpreting and creating protobuf packets for Wi-Fi provisioning

from __future__ import print_function

import proto
import utils
from future.utils import tobytes


def print_verbose(security_ctx, data):
    if (security_ctx.verbose):
        print('++++ ' + data + ' ++++')


def config_get_status_request(security_ctx):
    # Form protobuf request packet for GetStatus command
    cfg1 = proto.wifi_config_pb2.WiFiConfigPayload()
    cfg1.msg = proto.wifi_config_pb2.TypeCmdGetStatus
    cmd_get_status = proto.wifi_config_pb2.CmdGetStatus()
    cfg1.cmd_get_status.MergeFrom(cmd_get_status)
    encrypted_cfg = security_ctx.encrypt_data(cfg1.SerializeToString()).decode('latin-1')
    print_verbose(security_ctx, 'Client -> Device (Encrypted CmdGetStatus) ' + utils.str_to_hexstr(encrypted_cfg))
    return encrypted_cfg


def config_get_status_response(security_ctx, response_data):
    # Interpret protobuf response packet from GetStatus command
    decrypted_message = security_ctx.decrypt_data(tobytes(response_data))
    cmd_resp1 = proto.wifi_config_pb2.WiFiConfigPayload()
    cmd_resp1.ParseFromString(decrypted_message)
    print_verbose(security_ctx, 'Response type ' + str(cmd_resp1.msg))
    print_verbose(security_ctx, 'Response status ' + str(cmd_resp1.resp_get_status.status))

    if cmd_resp1.resp_get_status.sta_state == 0:
        print('++++ WiFi state: ' + 'connected ++++')
        return 'connected'
    elif cmd_resp1.resp_get_status.sta_state == 1:
        print('++++ WiFi state: ' + 'connecting... ++++')
        return 'connecting'
    elif cmd_resp1.resp_get_status.sta_state == 2:
        print('++++ WiFi state: ' + 'disconnected ++++')
        return 'disconnected'
    elif cmd_resp1.resp_get_status.sta_state == 3:
        print('++++ WiFi state: ' + 'connection failed ++++')
        if cmd_resp1.resp_get_status.fail_reason == 0:
            print('++++ Failure reason: ' + 'Incorrect Password ++++')
        elif cmd_resp1.resp_get_status.fail_reason == 1:
            print('++++ Failure reason: ' + 'Incorrect SSID ++++')
        return 'failed'
    return 'unknown'


def config_set_config_request(security_ctx, ssid, passphrase):
    # Form protobuf request packet for SetConfig command
    cmd = proto.wifi_config_pb2.WiFiConfigPayload()
    cmd.msg = proto.wifi_config_pb2.TypeCmdSetConfig
    cmd.cmd_set_config.ssid = tobytes(ssid)
    cmd.cmd_set_config.passphrase = tobytes(passphrase)
    enc_cmd = security_ctx.encrypt_data(cmd.SerializeToString()).decode('latin-1')
    print_verbose(security_ctx, 'Client -> Device (SetConfig cmd) ' + utils.str_to_hexstr(enc_cmd))
    return enc_cmd


def config_set_config_response(security_ctx, response_data):
    # Interpret protobuf response packet from SetConfig command
    decrypt = security_ctx.decrypt_data(tobytes(response_data))
    cmd_resp4 = proto.wifi_config_pb2.WiFiConfigPayload()
    cmd_resp4.ParseFromString(decrypt)
    print_verbose(security_ctx, 'SetConfig status ' + str(cmd_resp4.resp_set_config.status))
    return cmd_resp4.resp_set_config.status


def config_apply_config_request(security_ctx):
    # Form protobuf request packet for ApplyConfig command
    cmd = proto.wifi_config_pb2.WiFiConfigPayload()
    cmd.msg = proto.wifi_config_pb2.TypeCmdApplyConfig
    enc_cmd = security_ctx.encrypt_data(cmd.SerializeToString()).decode('latin-1')
    print_verbose(security_ctx, 'Client -> Device (ApplyConfig cmd) ' + utils.str_to_hexstr(enc_cmd))
    return enc_cmd


def config_apply_config_response(security_ctx, response_data):
    # Interpret protobuf response packet from ApplyConfig command
    decrypt = security_ctx.decrypt_data(tobytes(response_data))
    cmd_resp5 = proto.wifi_config_pb2.WiFiConfigPayload()
    cmd_resp5.ParseFromString(decrypt)
    print_verbose(security_ctx, 'ApplyConfig status ' + str(cmd_resp5.resp_apply_config.status))
    return cmd_resp5.resp_apply_config.status
