/*
==================================================================================
  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"
	"strconv"
	"sync"
)

//-----------------------------------------------------------------------------
//
//-----------------------------------------------------------------------------
type TransactionXappKey struct {
	RmrEndpoint
	Xid string // xapp xid in req
}

func (key *TransactionXappKey) String() string {
	return key.RmrEndpoint.String() + "/" + key.Xid
}

//-----------------------------------------------------------------------------
//
//-----------------------------------------------------------------------------
type Transaction struct {
	mutex             sync.Mutex
	tracker           *Tracker                            //tracker instance
	Subs              *Subscription                       //related subscription
	RmrEndpoint       RmrEndpoint                         //xapp endpoint
	Mtype             int                                 //type of initiating message
	Xid               string                              //xapp xid in req
	Meid              *xapp.RMRMeid                       //meid transaction related
	SubReqMsg         *e2ap.E2APSubscriptionRequest       //SubReq TODO: maybe own transactions per type
	SubDelReqMsg      *e2ap.E2APSubscriptionDeleteRequest //SubDelReq TODO: maybe own transactions per type
	Payload           []byte                              //packed message to optimize retransmissions
	PayloadLen        int                                 //packed message len to optimize  retransmissions
	RespReceived      bool
	ForwardRespToXapp bool
}

func (t *Transaction) String() string {
	t.mutex.Lock()
	defer t.mutex.Unlock()
	var subId string = "?"
	if t.Subs != nil {
		subId = strconv.FormatUint(uint64(t.Subs.Seq), 10)
	}
	return subId + "/" + t.RmrEndpoint.String() + "/" + t.Xid
}

func (t *Transaction) GetXid() string {
	t.mutex.Lock()
	defer t.mutex.Unlock()
	return t.Xid
}

func (t *Transaction) GetMtype() int {
	t.mutex.Lock()
	defer t.mutex.Unlock()
	return t.Mtype
}

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

func (t *Transaction) GetSrc() string {
	t.mutex.Lock()
	defer t.mutex.Unlock()
	return t.RmrEndpoint.String()
}

func (t *Transaction) CheckResponseReceived() bool {
	t.mutex.Lock()
	defer t.mutex.Unlock()
	if t.RespReceived == false {
		t.RespReceived = true
		return false
	}
	return true
}

func (t *Transaction) RetryTransaction() {
	t.mutex.Lock()
	defer t.mutex.Unlock()
	t.RespReceived = false
}

func (t *Transaction) Release() {
	t.mutex.Lock()
	defer t.mutex.Unlock()
	if t.Subs != nil {
		t.Subs.UnSetTransaction(t)
	}
	if t.tracker != nil {
		xappkey := TransactionXappKey{t.RmrEndpoint, t.Xid}
		t.tracker.UnTrackTransaction(xappkey)
	}
	t.Subs = nil
	t.tracker = nil
}