# Microsoft Azure Linux Agent
#
# Copyright 2014 Microsoft Corporation
#
# 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.
#
# Requires Python 2.4+ and Openssl 1.0+
#
import socket
import azurelinuxagent.common.logger as logger
import azurelinuxagent.common.utils.restutil as restutil
from azurelinuxagent.common.exception import ProtocolError, HttpError
from azurelinuxagent.common.future import ustr
from azurelinuxagent.common.version import DISTRO_VERSION, DISTRO_NAME, CURRENT_VERSION


def validate_param(name, val, expected_type):
    if val is None:
        raise ProtocolError("{0} is None".format(name))
    if not isinstance(val, expected_type):
        raise ProtocolError(("{0} type should be {1} not {2}"
                             "").format(name, expected_type, type(val)))


def set_properties(name, obj, data):
    if isinstance(obj, DataContract):
        validate_param("Property '{0}'".format(name), data, dict)
        for prob_name, prob_val in data.items():
            prob_full_name = "{0}.{1}".format(name, prob_name)
            try:
                prob = getattr(obj, prob_name)
            except AttributeError:
                logger.warn("Unknown property: {0}", prob_full_name)
                continue
            prob = set_properties(prob_full_name, prob, prob_val)
            setattr(obj, prob_name, prob)
        return obj
    elif isinstance(obj, DataContractList):
        validate_param("List '{0}'".format(name), data, list)
        for item_data in data:
            item = obj.item_cls()
            item = set_properties(name, item, item_data)
            obj.append(item)
        return obj
    else:
        return data


def get_properties(obj):
    if isinstance(obj, DataContract):
        data = {}
        props = vars(obj)
        for prob_name, prob in list(props.items()):
            data[prob_name] = get_properties(prob)
        return data
    elif isinstance(obj, DataContractList):
        data = []
        for item in obj:
            item_data = get_properties(item)
            data.append(item_data)
        return data
    else:
        return obj


class DataContract(object):
    pass


class DataContractList(list):
    def __init__(self, item_cls):
        self.item_cls = item_cls


"""
Data contract between guest and host
"""


class VMInfo(DataContract):
    def __init__(self,
                 subscriptionId=None,
                 vmName=None,
                 containerId=None,
                 roleName=None,
                 roleInstanceName=None,
                 tenantName=None):
        self.subscriptionId = subscriptionId
        self.vmName = vmName
        self.containerId = containerId
        self.roleName = roleName
        self.roleInstanceName = roleInstanceName
        self.tenantName = tenantName


class CertificateData(DataContract):
    def __init__(self, certificateData=None):
        self.certificateData = certificateData


class Cert(DataContract):
    def __init__(self,
                 name=None,
                 thumbprint=None,
                 certificateDataUri=None,
                 storeName=None,
                 storeLocation=None):
        self.name = name
        self.thumbprint = thumbprint
        self.certificateDataUri = certificateDataUri
        self.storeLocation = storeLocation
        self.storeName = storeName


class CertList(DataContract):
    def __init__(self):
        self.certificates = DataContractList(Cert)


# TODO: confirm vmagent manifest schema
class VMAgentManifestUri(DataContract):
    def __init__(self, uri=None):
        self.uri = uri


class VMAgentManifest(DataContract):
    def __init__(self, family=None):
        self.family = family
        self.versionsManifestUris = DataContractList(VMAgentManifestUri)


class VMAgentManifestList(DataContract):
    def __init__(self):
        self.vmAgentManifests = DataContractList(VMAgentManifest)


class Extension(DataContract):
    def __init__(self,
                 name=None,
                 sequenceNumber=None,
                 publicSettings=None,
                 protectedSettings=None,
                 certificateThumbprint=None):
        self.name = name
        self.sequenceNumber = sequenceNumber
        self.publicSettings = publicSettings
        self.protectedSettings = protectedSettings
        self.certificateThumbprint = certificateThumbprint


class ExtHandlerProperties(DataContract):
    def __init__(self):
        self.version = None
        self.upgradePolicy = None
        self.upgradeGuid = None
        self.state = None
        self.extensions = DataContractList(Extension)


class ExtHandlerVersionUri(DataContract):
    def __init__(self):
        self.uri = None


class ExtHandler(DataContract):
    def __init__(self, name=None):
        self.name = name
        self.properties = ExtHandlerProperties()
        self.versionUris = DataContractList(ExtHandlerVersionUri)


class ExtHandlerList(DataContract):
    def __init__(self):
        self.extHandlers = DataContractList(ExtHandler)


class ExtHandlerPackageUri(DataContract):
    def __init__(self, uri=None):
        self.uri = uri


class ExtHandlerPackage(DataContract):
    def __init__(self, version=None):
        self.version = version
        self.uris = DataContractList(ExtHandlerPackageUri)
        # TODO update the naming to align with metadata protocol
        self.isinternal = False
        self.disallow_major_upgrade = False


class ExtHandlerPackageList(DataContract):
    def __init__(self):
        self.versions = DataContractList(ExtHandlerPackage)


class VMProperties(DataContract):
    def __init__(self, certificateThumbprint=None):
        # TODO need to confirm the property name
        self.certificateThumbprint = certificateThumbprint


class ProvisionStatus(DataContract):
    def __init__(self, status=None, subStatus=None, description=None):
        self.status = status
        self.subStatus = subStatus
        self.description = description
        self.properties = VMProperties()


class ExtensionSubStatus(DataContract):
    def __init__(self, name=None, status=None, code=None, message=None):
        self.name = name
        self.status = status
        self.code = code
        self.message = message


class ExtensionStatus(DataContract):
    def __init__(self,
                 configurationAppliedTime=None,
                 operation=None,
                 status=None,
                 seq_no=None,
                 code=None,
                 message=None):
        self.configurationAppliedTime = configurationAppliedTime
        self.operation = operation
        self.status = status
        self.sequenceNumber = seq_no
        self.code = code
        self.message = message
        self.substatusList = DataContractList(ExtensionSubStatus)


class ExtHandlerStatus(DataContract):
    def __init__(self,
                 name=None,
                 version=None,
                 upgradeGuid=None,
                 status=None,
                 code=0,
                 message=None):
        self.name = name
        self.version = version
        self.upgradeGuid = upgradeGuid
        self.status = status
        self.code = code
        self.message = message
        self.extensions = DataContractList(ustr)


class VMAgentStatus(DataContract):
    def __init__(self, status=None, message=None):
        self.status = status
        self.message = message
        self.hostname = socket.gethostname()
        self.version = str(CURRENT_VERSION)
        self.osname = DISTRO_NAME
        self.osversion = DISTRO_VERSION
        self.extensionHandlers = DataContractList(ExtHandlerStatus)


class VMStatus(DataContract):
    def __init__(self, status, message):
        self.vmAgent = VMAgentStatus(status=status, message=message)


class TelemetryEventParam(DataContract):
    def __init__(self, name=None, value=None):
        self.name = name
        self.value = value


class TelemetryEvent(DataContract):
    def __init__(self, eventId=None, providerId=None):
        self.eventId = eventId
        self.providerId = providerId
        self.parameters = DataContractList(TelemetryEventParam)


class TelemetryEventList(DataContract):
    def __init__(self):
        self.events = DataContractList(TelemetryEvent)


class Protocol(DataContract):
    def detect(self):
        raise NotImplementedError()

    def get_vminfo(self):
        raise NotImplementedError()

    def get_certs(self):
        raise NotImplementedError()

    def get_incarnation(self):
        raise NotImplementedError()

    def get_vmagent_manifests(self):
        raise NotImplementedError()

    def get_vmagent_pkgs(self, manifest):
        raise NotImplementedError()

    def get_ext_handlers(self):
        raise NotImplementedError()

    def get_ext_handler_pkgs(self, extension, etag):
        raise NotImplementedError()

    def get_artifacts_profile(self):
        raise NotImplementedError()

    def download_ext_handler_pkg(self, uri, headers=None, use_proxy=True):
        try:
            resp = restutil.http_get(uri, headers=headers, use_proxy=use_proxy)
            if restutil.request_succeeded(resp):
                return resp.read()
        except Exception as e:
            logger.warn("Failed to download from: {0}".format(uri), e)

    def report_provision_status(self, provision_status):
        raise NotImplementedError()

    def report_vm_status(self, vm_status):
        raise NotImplementedError()

    def report_ext_status(self, ext_handler_name, ext_name, ext_status):
        raise NotImplementedError()

    def report_event(self, event):
        raise NotImplementedError()