#
# Copyright 2018 the original author or authors.
#
# 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
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#      http://www.apache.org/licenses/LICENSE-2.0
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# 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.
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"""
Interface definition for Voltha Adapters
"""
from __future__ import absolute_import
from zope.interface import Interface


class IAdapterInterface(Interface):
    """
    A Voltha adapter.  This interface is used by the Voltha Core to initiate
    requests towards a voltha adapter.
    """

    def adapter_descriptor():
        """
        Return the adapter descriptor object for this adapter.
        :return: voltha.Adapter grpc object (see voltha/protos/adapter.proto),
        with adapter-specific information and config extensions.
        """

    def device_types():
        """
        Return list of device types supported by the adapter.
        :return: voltha.DeviceTypes protobuf object, with optional type
        specific extensions.
        """

    def health():
        """
        Return a 3-state health status using the voltha.HealthStatus message.
        :return: Deferred or direct return with voltha.HealthStatus message
        """

    def adopt_device(device):
        """
        Make sure the adapter looks after given device. Called when a device
        is provisioned top-down and needs to be activated by the adapter.
        :param device: A voltha.Device object, with possible device-type
        specific extensions. Such extensions shall be described as part of
        the device type specification returned by device_types().
        :return: (Deferred) Shall be fired to acknowledge device ownership.
        """

    def reconcile_device(device):
        """
        Make sure the adapter looks after given device. Called when this
        device has changed ownership from another Voltha instance to
        this one (typically, this occurs when the previous voltha
        instance went down).
        :param device: A voltha.Device object, with possible device-type
        specific extensions. Such extensions shall be described as part of
        the device type specification returned by device_types().
        :return: (Deferred) Shall be fired to acknowledge device ownership.
        """

    def abandon_device(device):
        """
        Make sur ethe adapter no longer looks after device. This is called
        if device ownership is taken over by another Voltha instance.
        :param device: A Voltha.Device object.
        :return: (Deferred) Shall be fired to acknowledge abandonment.
        """

    def disable_device(device):
        """
        This is called when a previously enabled device needs to be disabled
        based on a NBI call.
        :param device: A Voltha.Device object.
        :return: (Deferred) Shall be fired to acknowledge disabling the device.
        """

    def reenable_device(device):
        """
        This is called when a previously disabled device needs to be enabled
        based on a NBI call.
        :param device: A Voltha.Device object.
        :return: (Deferred) Shall be fired to acknowledge re-enabling the
        device.
        """

    def reboot_device(device):
        """
        This is called to reboot a device based on a NBI call.  The admin
        state of the device will not change after the reboot
        :param device: A Voltha.Device object.
        :return: (Deferred) Shall be fired to acknowledge the reboot.
        """

    def download_image(device, request):
        """
        This is called to request downloading a specified image into
        the standby partition of a device based on a NBI call.
        This call is expected to be non-blocking.
        :param device: A Voltha.Device object.
                       A Voltha.ImageDownload object.
        :return: (Deferred) Shall be fired to acknowledge the download.
        """

    def get_image_download_status(device, request):
        """
        This is called to inquire about a requested image download
        status based on a NBI call.
        The adapter is expected to update the DownloadImage DB object
        with the query result
        :param device: A Voltha.Device object.
                       A Voltha.ImageDownload object.
        :return: (Deferred) Shall be fired to acknowledge
        """

    def cancel_image_download(device, request):
        """
        This is called to cancel a requested image download
        based on a NBI call.  The admin state of the device will not
        change after the download.
        :param device: A Voltha.Device object.
                       A Voltha.ImageDownload object.
        :return: (Deferred) Shall be fired to acknowledge
        """

    def activate_image_update(device, request):
        """
        This is called to activate a downloaded image from
        a standby partition into active partition.
        Depending on the device implementation, this call
        may or may not cause device reboot.
        If no reboot, then a reboot is required to make the
        activated image running on device
        This call is expected to be non-blocking.
        :param device: A Voltha.Device object.
                       A Voltha.ImageDownload object.
        :return: (Deferred) OperationResponse object.
        """

    def revert_image_update(device, request):
        """
        This is called to deactivate the specified image at
        active partition, and revert to previous image at
        standby partition.
        Depending on the device implementation, this call
        may or may not cause device reboot.
        If no reboot, then a reboot is required to make the
        previous image running on device
        This call is expected to be non-blocking.
        :param device: A Voltha.Device object.
                       A Voltha.ImageDownload object.
        :return: (Deferred) OperationResponse object.
        """

    def enable_port(device_id, port):
        """
        This is called to enable the specified port.

        Depending on the implementation, this call may or may
        not cause port enable.
        This call is expected to be non-blocking.
        :param device_id: A voltha.Device.id object.
        :param port: A voltha.Port object
        """

    def disable_port(device_id, port):
        """
        This is called to disable the specified port.

        Depending on the implementation, this call may or may
        not cause port disable.
        This call is expected to be non-blocking.
        :param device_id: A voltha.Device.id object.
        :param port: A voltha.Port object
        """

    def self_test_device(device):
        """
        This is called to Self a device based on a NBI call.
        :param device: A Voltha.Device object.
        :return: Will return result of self test
        """

    def delete_device(device):
        """
        This is called to delete a device from the PON based on a NBI call.
        If the device is an OLT then the whole PON will be deleted.
        :param device: A Voltha.Device object.
        :return: (Deferred) Shall be fired to acknowledge the deletion.
        """

    def get_device_details(device):
        """
        This is called to get additional device details based on a NBI call.
        :param device: A Voltha.Device object.
        :return: (Deferred) Shall be fired to acknowledge the retrieval of
        additional details.
        """

    def update_flows_bulk(device, flows, groups):
        """
        Called after any flow table change, but only if the device supports
        bulk mode, which is expressed by the 'accepts_bulk_flow_update'
        capability attribute of the device type.
        :param device: A Voltha.Device object.
        :param flows: An openflow_v13.Flows object
        :param groups: An  openflow_v13.Flows object
        :return: (Deferred or None)
        """

    def update_flows_incrementally(device, flow_changes, group_changes):
        """
        Called after a flow table update, but only if the device supports
        non-bulk mode, which is expressed by the 'accepts_add_remove_flow_updates'
        capability attribute of the device type.
        :param device: A Voltha.Device object.
        :param flow_changes: An openflow_v13.FlowChanges object
        :param group_changes: An openflow_v13.FlowGroupChanges object
        :return: (Deferred or None)
        """

    def update_pm_config(device, pm_configs):
        """
        Called every time a request is made to change pm collection behavior
        :param device: A Voltha.Device object
        :param pm_collection_config: A Pms
        """

    def receive_packet_out(device_id, egress_port_no, msg):
        """
        Pass a packet_out message content to adapter so that it can forward
        it out to the device. This is only called on root devices.
        :param device_id: device ID
        :param egress_port: egress logical port number
         :param msg: actual message
        :return: None
        """

    def suppress_alarm(filter):
        """
        Inform an adapter that all incoming alarms should be suppressed
        :param filter: A Voltha.AlarmFilter object.
        :return: (Deferred) Shall be fired to acknowledge the suppression.
        """

    def unsuppress_alarm(filter):
        """
        Inform an adapter that all incoming alarms should resume
        :param filter: A Voltha.AlarmFilter object.
        :return: (Deferred) Shall be fired to acknowledge the unsuppression.
        """

    def get_ofp_device_info(device):
        """
        Retrieve the OLT device info. This includes the ofp_desc and
        ofp_switch_features. The existing ofp structures can be used,
        or all the attributes get added to the Device definition or a new proto
        definition gets created. This API will allow the Core to create a
        LogicalDevice associated with this device (OLT only).
        :param device: device
        :return: Proto Message (TBD)
        """

    def process_inter_adapter_message(msg):
        """
        Called when the adapter receives a message that was sent to it directly
        from another adapter. An adapter is automatically registered for these
        messages when creating the inter-container kafka proxy. Note that it is
        the responsibility of the sending and receiving adapters to properly encode
        and decode the message.
        :param msg: Proto Message (any)
        :return: Proto Message Response
        """


class ICoreSouthBoundInterface(Interface):
    """
    Represents a Voltha Core. This is used by an adapter to initiate async
    calls towards Voltha Core.
    """

    def get_device(device_id):
        """
        Retrieve a device using its ID.
        :param device_id: a device ID
        :return: Device Object or None
        """

    def get_child_device(parent_device_id, **kwargs):
        """
        Retrieve a child device object belonging to the specified parent
        device based on some match criteria. The first child device that
        matches the provided criteria is returned.
        :param parent_device_id: parent's device protobuf ID
        :param **kwargs: arbitrary list of match criteria where the Value
        in each key-value pair must be a protobuf type
        :return: Child Device Object or None
        """

    def get_ports(device_id, port_type):
        """
        Retrieve all the ports of a given type of a Device.
        :param device_id: a device ID
        :param port_type: type of port
        :return Ports object
        """

    def get_child_devices(parent_device_id):
        """
        Get all child devices given a parent device id
        :param parent_device_id: The parent device ID
        :return: Devices object
        """

    def get_child_device_with_proxy_address(proxy_address):
        """
        Get a child device based on its proxy address. Proxy address is
        defined as {parent id, channel_id}
        :param proxy_address: A Device.ProxyAddress object
        :return: Device object or None
        """

    def device_state_update(device_id,
                            oper_status=None,
                            connect_status=None):
        """
        Update a device state.
        :param device_id: The device ID
        :param oper_state: Operational state of device
        :param conn_state: Connection state of device
        :return: None
        """

    def child_device_detected(parent_device_id,
                              parent_port_no,
                              child_device_type,
                              channel_id,
                              **kw):
        """
        A child device has been detected.  Core will create the device along
        with its unique ID.
        :param parent_device_id: The parent device ID
        :param parent_port_no: The parent port number
        :param device_type: The child device type
        :param channel_id: A unique identifier for that child device within
        the parent device (e.g. vlan_id)
        :param kw: A list of key-value pair where the value is a protobuf
        message
        :return: None
        """

    def device_update(device):
        """
        Event corresponding to a device update.
        :param device: Device Object
        :return: None
        """

    def child_device_removed(parent_device_id, child_device_id):
        """
        Event indicating a child device has been removed from a parent.
        :param parent_device_id: Device ID of the parent
        :param child_device_id: Device ID of the child
        :return: None
        """

    def child_devices_state_update(parent_device_id,
                                   oper_status=None,
                                   connect_status=None,
                                   admin_status=None):
        """
        Event indicating the status of all child devices have been changed.
        :param parent_device_id: Device ID of the parent
        :param oper_status: Operational status
        :param connect_status: Connection status
        :param admin_status: Admin status
        :return: None
        """

    def child_devices_removed(parent_device_id):
        """
        Event indicating all child devices have been removed from a parent.
        :param parent_device_id: Device ID of the parent device
        :return: None
        """

    def device_pm_config_update(device_pm_config, init=False):
        """
        Event corresponding to a PM config update of a device.
        :param device_pm_config: a PmConfigs object
        :param init: True indicates initializing stage
        :return: None
        """

    def port_created(device_id, port):
        """
        A port has been created and needs to be added to a device.
        :param device_id: a device ID
        :param port: Port object
        :return None
        """

    def port_removed(device_id, port):
        """
        A port has been removed and it needs to be removed from a Device.
        :param device_id: a device ID
        :param port: a Port object
        :return None
        """

    def ports_enabled(device_id):
        """
        All ports on that device have been re-enabled. The Core will change
        the admin state to ENABLED and operational state to ACTIVE for all
        ports on that device.
        :param device_id: a device ID
        :return: None
        """

    def ports_disabled(device_id):
        """
        All ports on that device have been disabled. The Core will change the
        admin status to DISABLED and operational state to UNKNOWN for all
        ports on that device.
        :param device_id: a device ID
        :return: None
        """

    def ports_oper_status_update(device_id, oper_status):
        """
        The operational status of all ports of a Device has been changed.
        The Core will update the operational status for all ports on the
        device.
        :param device_id: a device ID
        :param oper_status: operational Status
        :return None
        """

    def image_download_update(img_dnld):
        """
        Event corresponding to an image download update.
        :param img_dnld: a ImageDownload object
        :return: None
        """

    def image_download_deleted(img_dnld):
        """
        Event corresponding to the deletion of a downloaded image. The
        references of this image needs to be removed from the Core.
        :param img_dnld: a ImageDownload object
        :return: None
        """

    def packet_in(device_id, egress_port_no, packet):
        """
        Sends a packet to the SDN controller via voltha Core
        :param device_id: The OLT device ID
        :param egress_port_no: The port number representing the ONU (cvid)
        :param packet: The actual packet
         :return: None
        """