/*
==================================================================================
  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"

	"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           xapp.RmrEndpointList          // Endpoints
	RMRRouteCreated  bool                          // Does subscription have RMR route
	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
	OngoingReqCount  int                           // Subscription create process is ongoing. In merge case it can ongoing for more than one endpoint
	OngoingDelCount  int                           // Subscription delete process is ongoing. In merge case it can ongoing for more than one endpoint
	PolicyUpdate     bool                          // This is true when policy subscrition is being updated. Used not to send delete for update after timeout or restart
	RetryFromXapp    bool                          // Retry form xApp for subscription that already exist
	SubRespRcvd      bool                          // Subscription response received
	DeleteFromDb     bool                          // Delete subscription from db
	NoRespToXapp     bool                          // Send no response for subscription delete to xApp after restart
	DoNotWaitSubResp bool                          // Test flag. Response is not waited for Subscription Request
}

func (s *Subscription) String() string {
	meidstr := "N/A"
	if s.Meid != nil {
		meidstr = s.Meid.String()
	}
	return "subs(" + s.ReqId.String() + "/" + meidstr + "/" + 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()
	return s.Meid
}

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.Data.Length != subReqMsg.EventTriggerDefinition.Data.Length {
		return false
	}
	for i := uint64(0); i < s.SubReqMsg.EventTriggerDefinition.Data.Length; i++ {
		if s.SubReqMsg.EventTriggerDefinition.Data.Data[i] != subReqMsg.EventTriggerDefinition.Data.Data[i] {
			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 {
				return false
			}

			if acts.ActionDefinitionChoice.Data.Length != actt.ActionDefinitionChoice.Data.Length {
				return false
			}
			for i := uint64(0); i < acts.ActionDefinitionChoice.Data.Length; i++ {
				if acts.ActionDefinitionChoice.Data.Data[i] != actt.ActionDefinitionChoice.Data.Data[i] {
					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
}