/*
 * Copyright 2021-present Open Networking Foundation

 * 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.
 */
package device

import (
	"context"
	"errors"

	"github.com/opencord/voltha-lib-go/v7/pkg/log"
	"github.com/opencord/voltha-protos/v5/go/core"
	"github.com/opencord/voltha-protos/v5/go/voltha"
	"google.golang.org/grpc/codes"
	"google.golang.org/grpc/status"
)

//
//CreateLogicalDevice creates logical device in core
func (dMgr *Manager) CreateLogicalDevice(ctx context.Context, cDevice *voltha.Device) error {
	logger.Info(ctx, "create-logical-device")
	// Verify whether the logical device has already been created
	if cDevice.ParentId != "" {
		logger.Debugw(ctx, "parent-device-already-exist", log.Fields{"device-id": cDevice.Id, "logical-device-id": cDevice.Id})
		return nil
	}
	var err error
	if _, err = dMgr.logicalDeviceMgr.createLogicalDevice(ctx, cDevice); err != nil {
		logger.Warnw(ctx, "create-logical-device-error", log.Fields{"device": cDevice})
		return err
	}
	return nil
}

// DeleteLogicalDevice deletes logical device from core
func (dMgr *Manager) DeleteLogicalDevice(ctx context.Context, cDevice *voltha.Device) error {
	logger.Info(ctx, "delete-logical-device")
	if err := dMgr.logicalDeviceMgr.deleteLogicalDevice(ctx, cDevice); err != nil {
		return err
	}
	// Remove the logical device Id from the parent device
	logicalID := ""
	dMgr.UpdateDeviceAttribute(ctx, cDevice.Id, "ParentId", logicalID)
	return nil
}

// DeleteLogicalPorts removes the logical ports associated with that deviceId
func (dMgr *Manager) DeleteLogicalPorts(ctx context.Context, cDevice *voltha.Device) error {
	logger.Debugw(ctx, "delete-all-logical-ports", log.Fields{"device-id": cDevice.Id})
	if err := dMgr.logicalDeviceMgr.deleteLogicalPorts(ctx, cDevice.Id); err != nil {
		// Just log the error.   The logical device or port may already have been deleted before this callback is invoked.
		logger.Warnw(ctx, "delete-logical-ports-error", log.Fields{"device-id": cDevice.Id, "error": err})
	}
	return nil
}

// SetupUNILogicalPorts creates UNI ports on the logical device that represents a child UNI interface
func (dMgr *Manager) SetupUNILogicalPorts(ctx context.Context, cDevice *voltha.Device) error {
	logger.Info(ctx, "setup-uni-logical-ports")
	cDevicePorts, err := dMgr.listDevicePorts(ctx, cDevice.Id)
	if err != nil {
		return err
	}
	if err := dMgr.logicalDeviceMgr.setupUNILogicalPorts(ctx, cDevice, cDevicePorts); err != nil {
		logger.Warnw(ctx, "setup-uni-logical-ports-error", log.Fields{"device": cDevice, "err": err})
		return err
	}
	return nil
}

// RunPostDeviceDelete removes any reference of this device
func (dMgr *Manager) RunPostDeviceDelete(ctx context.Context, cDevice *voltha.Device) error {
	logger.Infow(ctx, "run-post-device-delete", log.Fields{"device-id": cDevice.Id})
	//deleting the logical device
	logger.Debugw(ctx, "delete-logical-device", log.Fields{"device-id": cDevice.Id})
	if dMgr.logicalDeviceMgr != nil && cDevice.Root {
		if err := dMgr.logicalDeviceMgr.deleteLogicalDevice(ctx, cDevice); err != nil {
			logger.Warnw(ctx, "failure-delete-logical-device", log.Fields{"device-id": cDevice.Id, "error": err.Error()})
		}
		// Remove the logical device Id from the parent device
		logicalID := ""
		dMgr.UpdateDeviceAttribute(ctx, cDevice.Id, "ParentId", logicalID)
	}
	if agent := dMgr.getDeviceAgent(ctx, cDevice.Id); agent != nil {
		logger.Debugw(ctx, "invoking-delete-device-and-ports", log.Fields{"device-id": cDevice.Id})
		//delete ports
		if err := agent.deleteAllPorts(ctx); err != nil {
			logger.Warnw(ctx, "failure-delete-device-ports", log.Fields{"device-id": cDevice.Id, "error": err.Error()})
		}
	}
	dMgr.stopManagingDevice(ctx, cDevice.Id)
	return nil
}

//DeleteAllLogicalPorts is invoked as a callback when the parent device's connection status moves to UNREACHABLE
func (dMgr *Manager) DeleteAllLogicalPorts(ctx context.Context, parentDevice *voltha.Device) error {
	logger.Debugw(ctx, "delete-all-logical-ports", log.Fields{"parent-device-id": parentDevice.Id})
	if err := dMgr.logicalDeviceMgr.deleteAllLogicalPorts(ctx, parentDevice); err != nil {
		// Just log error as logical device may already have been deleted
		logger.Warnw(ctx, "delete-all-logical-ports-fail", log.Fields{"parent-device-id": parentDevice.Id, "error": err})
	}
	return nil
}

// DeleteAllChildDevices is invoked as a callback when the parent device is deleted.  The force
// delete option is used in this callback because if the child device is in reconcile state then
// a delete request with no force option would not be sent to the child adapter, hence leaving the
// system in an unknown state.  See https://jira.opencord.org/browse/VOL-4421 for more details.
func (dMgr *Manager) DeleteAllChildDevices(ctx context.Context, parentCurrDevice *voltha.Device) error {
	logger.Debugw(ctx, "delete-all-child-devices", log.Fields{"parent-device-id": parentCurrDevice.Id})

	agent := dMgr.getDeviceAgent(ctx, parentCurrDevice.Id)
	if agent == nil {
		return status.Errorf(codes.NotFound, "%s", parentCurrDevice.Id)
	}

	ports, _ := dMgr.listDevicePorts(ctx, parentCurrDevice.Id)
	for childDeviceID := range dMgr.getAllChildDeviceIds(ctx, ports) {
		if agent := dMgr.getDeviceAgent(ctx, childDeviceID); agent != nil {
			logger.Debugw(ctx, "invoking-delete-device", log.Fields{"device-id": childDeviceID, "parent-device-id": parentCurrDevice.Id})
			if err := agent.deleteDeviceForce(ctx); err != nil {
				logger.Warnw(ctx, "delete-device-force-failed", log.Fields{"device-id": childDeviceID, "parent-device-id": parentCurrDevice.Id,
					"error": err})
				// We got an error - if its a connection error we should just mark the device as delete failed and
				// when connection is established then proceed with the deletion instead of reconciling the device.
				// A DeviceTransientState_DELETE_FAILED does not perform any state transition
				if errors.Is(err, errNoConnection) {
					if err = agent.updateTransientState(ctx, core.DeviceTransientState_DELETE_FAILED); err != nil {
						logger.Warnw(ctx, "failed-updating-transient-state", log.Fields{"device-id": childDeviceID, "parent-device-id": parentCurrDevice.Id,
							"error": err})
					}
					logger.Debugw(ctx, "device-set-to-delete-failed", log.Fields{"device-id": childDeviceID, "parent-device-id": parentCurrDevice.Id})
				}
			}
			// No further action is required here.  The deleteDevice will change the device state where the resulting
			// callback will take care of cleaning the child device agent.
		}
	}
	return nil
}

//DeleteAllDeviceFlows is invoked as a callback when the parent device's connection status moves to UNREACHABLE
func (dMgr *Manager) DeleteAllDeviceFlows(ctx context.Context, parentDevice *voltha.Device) error {
	logger.Debugw(ctx, "delete-all-device-flows", log.Fields{"parent-device-id": parentDevice.Id})
	if agent := dMgr.getDeviceAgent(ctx, parentDevice.Id); agent != nil {
		if err := agent.deleteAllFlows(ctx); err != nil {
			logger.Errorw(ctx, "error-deleting-all-device-flows", log.Fields{"parent-device-id": parentDevice.Id})
			return err
		}
		return nil
	}
	return status.Errorf(codes.NotFound, "%s", parentDevice.Id)
}

// ChildDeviceLost  calls parent adapter to delete child device and all its references
func (dMgr *Manager) ChildDeviceLost(ctx context.Context, curr *voltha.Device) error {
	logger.Debugw(ctx, "child-device-lost", log.Fields{"child-device-id": curr.Id, "parent-device-id": curr.ParentId})
	if parentAgent := dMgr.getDeviceAgent(ctx, curr.ParentId); parentAgent != nil {
		if err := parentAgent.ChildDeviceLost(ctx, curr); err != nil {
			// Just log the message and let the remaining pipeline proceed.
			logger.Warnw(ctx, "childDeviceLost", log.Fields{"child-device-id": curr.Id, "parent-device-id": curr.ParentId, "error": err})
		}
	}
	// Do not return an error as parent device may also have been deleted.  Let the remaining pipeline proceed.
	return nil
}

func (dMgr *Manager) DeleteAllLogicalMeters(ctx context.Context, cDevice *voltha.Device) error {
	logger.Debugw(ctx, "delete-all-logical-device-meters", log.Fields{"device-id": cDevice.Id})
	if err := dMgr.logicalDeviceMgr.deleteAllLogicalMeters(ctx, cDevice.Id); err != nil {
		// Just log the error.   The logical device or port may already have been deleted before this callback is invoked.
		logger.Warnw(ctx, "delete-logical-meters-error", log.Fields{"device-id": cDevice.Id, "error": err})
	}
	return nil

}