/*
==================================================================================
  Copyright (c) 2019 AT&T Intellectual Property.
  Copyright (c) 2019 Nokia

   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 control

import (
	"gerrit.o-ran-sc.org/r/ric-plt/e2ap/pkg/e2ap"
	"gerrit.o-ran-sc.org/r/ric-plt/xapp-frame/pkg/xapp"
	"reflect"
	"sync"
)

//-----------------------------------------------------------------------------
//
//-----------------------------------------------------------------------------
type Subscription struct {
	mutex     sync.Mutex                    // Lock
	valid     bool                          // valid
	registry  *Registry                     // Registry
	ReqId     RequestId                     // ReqId (Requestor Id + Seq Nro a.k.a subsid)
	Meid      *xapp.RMRMeid                 // Meid/ RanName
	EpList    RmrEndpointList               // Endpoints
	TransLock sync.Mutex                    // Lock transactions, only one executed per time for subs
	TheTrans  TransactionIf                 // Ongoing transaction
	SubReqMsg *e2ap.E2APSubscriptionRequest // Subscription information
	SubRFMsg  interface{}                   // Subscription information
}

func (s *Subscription) String() string {
	return "subs(" + s.ReqId.String() + "/" + s.Meid.RanName + "/" + s.EpList.String() + ")"
}

func (s *Subscription) GetCachedResponse() (interface{}, bool) {
	s.mutex.Lock()
	defer s.mutex.Unlock()
	return s.SubRFMsg, s.valid
}

func (s *Subscription) SetCachedResponse(subRFMsg interface{}, valid bool) (interface{}, bool) {
	s.mutex.Lock()
	defer s.mutex.Unlock()
	s.SubRFMsg = subRFMsg
	s.valid = valid
	return s.SubRFMsg, s.valid
}

func (s *Subscription) GetReqId() *RequestId {
	s.mutex.Lock()
	defer s.mutex.Unlock()
	return &s.ReqId
}

func (s *Subscription) GetMeid() *xapp.RMRMeid {
	s.mutex.Lock()
	defer s.mutex.Unlock()
	if s.Meid != nil {
		return s.Meid
	}
	return nil
}

func (s *Subscription) GetTransaction() TransactionIf {
	s.mutex.Lock()
	defer s.mutex.Unlock()
	return s.TheTrans
}

func (s *Subscription) WaitTransactionTurn(trans TransactionIf) {
	s.TransLock.Lock()
	s.mutex.Lock()
	s.TheTrans = trans
	s.mutex.Unlock()
}

func (s *Subscription) ReleaseTransactionTurn(trans TransactionIf) {
	s.mutex.Lock()
	if trans != nil && trans == s.TheTrans {
		s.TheTrans = nil
	}
	s.mutex.Unlock()
	s.TransLock.Unlock()
}

func (s *Subscription) IsMergeable(trans *TransactionXapp, subReqMsg *e2ap.E2APSubscriptionRequest) bool {
	s.mutex.Lock()
	defer s.mutex.Unlock()

	if s.valid == false {
		return false
	}

	if s.SubReqMsg == nil {
		return false
	}

	if s.Meid.RanName != trans.Meid.RanName {
		return false
	}

	// EventTrigger check
	if s.SubReqMsg.EventTriggerDefinition.InterfaceDirection != subReqMsg.EventTriggerDefinition.InterfaceDirection ||
		s.SubReqMsg.EventTriggerDefinition.ProcedureCode != subReqMsg.EventTriggerDefinition.ProcedureCode ||
		s.SubReqMsg.EventTriggerDefinition.TypeOfMessage != subReqMsg.EventTriggerDefinition.TypeOfMessage {
		return false
	}

	if s.SubReqMsg.EventTriggerDefinition.InterfaceId.GlobalEnbId.Present != subReqMsg.EventTriggerDefinition.InterfaceId.GlobalEnbId.Present ||
		s.SubReqMsg.EventTriggerDefinition.InterfaceId.GlobalEnbId.NodeId != subReqMsg.EventTriggerDefinition.InterfaceId.GlobalEnbId.NodeId ||
		s.SubReqMsg.EventTriggerDefinition.InterfaceId.GlobalEnbId.PlmnIdentity.Val[0] != subReqMsg.EventTriggerDefinition.InterfaceId.GlobalEnbId.PlmnIdentity.Val[0] ||
		s.SubReqMsg.EventTriggerDefinition.InterfaceId.GlobalEnbId.PlmnIdentity.Val[1] != subReqMsg.EventTriggerDefinition.InterfaceId.GlobalEnbId.PlmnIdentity.Val[1] ||
		s.SubReqMsg.EventTriggerDefinition.InterfaceId.GlobalEnbId.PlmnIdentity.Val[2] != subReqMsg.EventTriggerDefinition.InterfaceId.GlobalEnbId.PlmnIdentity.Val[2] {
		return false
	}

	if s.SubReqMsg.EventTriggerDefinition.InterfaceId.GlobalGnbId.Present != subReqMsg.EventTriggerDefinition.InterfaceId.GlobalGnbId.Present ||
		s.SubReqMsg.EventTriggerDefinition.InterfaceId.GlobalGnbId.NodeId != subReqMsg.EventTriggerDefinition.InterfaceId.GlobalGnbId.NodeId ||
		s.SubReqMsg.EventTriggerDefinition.InterfaceId.GlobalGnbId.PlmnIdentity.Val[0] != subReqMsg.EventTriggerDefinition.InterfaceId.GlobalGnbId.PlmnIdentity.Val[0] ||
		s.SubReqMsg.EventTriggerDefinition.InterfaceId.GlobalGnbId.PlmnIdentity.Val[1] != subReqMsg.EventTriggerDefinition.InterfaceId.GlobalGnbId.PlmnIdentity.Val[1] ||
		s.SubReqMsg.EventTriggerDefinition.InterfaceId.GlobalGnbId.PlmnIdentity.Val[2] != subReqMsg.EventTriggerDefinition.InterfaceId.GlobalGnbId.PlmnIdentity.Val[2] {
		return false
	}

	// Actions check
	if len(s.SubReqMsg.ActionSetups) != len(subReqMsg.ActionSetups) {
		return false
	}

	for _, acts := range s.SubReqMsg.ActionSetups {
		for _, actt := range subReqMsg.ActionSetups {
			if acts.ActionId != actt.ActionId {
				return false
			}
			if acts.ActionType != actt.ActionType {
				return false
			}

			if acts.ActionType != e2ap.E2AP_ActionTypeReport {
				return false
			}

			if acts.RicActionDefinitionPresent != actt.RicActionDefinitionPresent ||
				reflect.DeepEqual(acts.ActionDefinitionChoice, actt.ActionDefinitionChoice) == false {
				return false
			}

			if acts.SubsequentAction.Present != actt.SubsequentAction.Present ||
				acts.SubsequentAction.Type != actt.SubsequentAction.Type ||
				acts.SubsequentAction.TimetoWait != actt.SubsequentAction.TimetoWait {
				return false
			}
		}
	}

	return true
}