/*
==================================================================================
  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/e2ap/pkg/packer"
	"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 "transkey(" + key.RmrEndpoint.String() + "/" + key.Xid + ")"
}

//-----------------------------------------------------------------------------
//
//-----------------------------------------------------------------------------
type Transaction struct {
	mutex             sync.Mutex
	tracker           *Tracker                             //tracker instance
	Subs              *Subscription                        //related subscription
	RmrEndpoint       RmrEndpoint                          //xapp endpoint
	Xid               string                               //xapp xid in req
	Meid              *xapp.RMRMeid                        //meid transaction related
	SubReqMsg         *e2ap.E2APSubscriptionRequest        //SubReq TODO: maybe own transactions per type
	SubRespMsg        *e2ap.E2APSubscriptionResponse       //SubResp TODO: maybe own transactions per type
	SubFailMsg        *e2ap.E2APSubscriptionFailure        //SubFail TODO: maybe own transactions per type
	SubDelReqMsg      *e2ap.E2APSubscriptionDeleteRequest  //SubDelReq TODO: maybe own transactions per type
	SubDelRespMsg     *e2ap.E2APSubscriptionDeleteResponse //SubDelResp TODO: maybe own transactions per type
	SubDelFailMsg     *e2ap.E2APSubscriptionDeleteFailure  //SubDelFail TODO: maybe own transactions per type
	Mtype             int                                  //Encoded message type to be send
	Payload           *packer.PackedData                   //Encoded message to be send
	RespReceived      bool
	ForwardRespToXapp bool
}

func (t *Transaction) StringImpl() string {
	var subId string = "?"
	if t.Subs != nil {
		subId = strconv.FormatUint(uint64(t.Subs.Seq), 10)
	}
	return "trans(" + t.RmrEndpoint.String() + "/" + t.Xid + "/" + t.Meid.RanName + "/" + subId + ")"
}

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

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()
	subs := t.Subs
	tracker := t.tracker
	xappkey := TransactionXappKey{t.RmrEndpoint, t.Xid}
	t.Subs = nil
	t.tracker = nil
	t.mutex.Unlock()

	if subs != nil {
		subs.UnSetTransaction(t)
	}
	if tracker != nil {
		tracker.UnTrackTransaction(xappkey)
	}
}