/*
 * Copyright 2020-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"

	"github.com/opencord/voltha-protos/v5/go/common"
	"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"
)

func (agent *Agent) getTransientState() core.DeviceTransientState_Types {
	transientStateHandle := agent.transientStateLoader.Lock()
	deviceTransientState := transientStateHandle.GetReadOnly()
	transientStateHandle.UnLock()
	return deviceTransientState
}

func (agent *Agent) matchTransientState(transientState core.DeviceTransientState_Types) bool {
	transientStateHandle := agent.transientStateLoader.Lock()
	defer transientStateHandle.UnLock()
	return transientState == transientStateHandle.GetReadOnly()
}

func (agent *Agent) updateTransientState(ctx context.Context, transientState core.DeviceTransientState_Types) error {
	// Already in same transientState
	if transientState == agent.getTransientState() {
		return nil
	}
	// Update device transient state
	transientStateHandle := agent.transientStateLoader.Lock()
	if err := transientStateHandle.Update(ctx, transientState); err != nil {
		transientStateHandle.UnLock()
		return status.Errorf(codes.Internal, "failed-update-device-transient-state:%s: %s", agent.deviceID, err)
	}
	transientStateHandle.UnLock()
	return nil
}

func (agent *Agent) isDeletionInProgress() bool {
	deviceTransientState := agent.getTransientState()
	return deviceTransientState == core.DeviceTransientState_FORCE_DELETING ||
		deviceTransientState == core.DeviceTransientState_DELETING_FROM_ADAPTER ||
		deviceTransientState == core.DeviceTransientState_DELETING_POST_ADAPTER_RESPONSE
}

func (agent *Agent) isForceDeletingAllowed(deviceTransientState core.DeviceTransientState_Types, device *voltha.Device) bool {
	return deviceTransientState != core.DeviceTransientState_FORCE_DELETING
}

func (agent *Agent) deleteTransientState(ctx context.Context) error {
	transientStateHandle := agent.transientStateLoader.Lock()
	if err := transientStateHandle.Delete(ctx); err != nil {
		transientStateHandle.UnLock()
		return status.Errorf(codes.Internal, "failed-delete-device-transient-state:%s: %s", agent.deviceID, err)
	}
	transientStateHandle.UnLock()
	return nil
}

func (agent *Agent) isInReconcileState(device *voltha.Device) bool {
	return device.OperStatus == common.OperStatus_RECONCILING || device.OperStatus == common.OperStatus_RECONCILING_FAILED ||
		agent.matchTransientState(core.DeviceTransientState_RECONCILE_IN_PROGRESS)
}