/*
==================================================================================
  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

/*
#include <stdlib.h>
#include <e2ap/wrapper.h>
#cgo LDFLAGS: -le2apwrapper
#cgo CFLAGS: -I/usr/local/include/e2ap
*/
import "C"

import (
	"errors"
	"unsafe"
)

type E2ap struct {
}

/* RICsubscriptionRequest */

func (c *E2ap) GetSubscriptionRequestSequenceNumber(payload []byte) (subId uint16, err error) {
	cptr := unsafe.Pointer(&payload[0])
	cret := C.e2ap_get_ric_subscription_request_sequence_number(cptr, C.size_t(len(payload)))
	if cret < 0 {
		return 0, errors.New("e2ap wrapper is unable to get Subscirption Request Sequence Number due to wrong or invalid payload")
	}
	subId = uint16(cret)
	return
}

func (c *E2ap) SetSubscriptionRequestSequenceNumber(payload []byte, newSubscriptionid uint16) (newPayload []byte, err error) {
	cptr := unsafe.Pointer(&payload[0])
	size := C.e2ap_set_ric_subscription_request_sequence_number(cptr, C.size_t(len(payload)), C.long(newSubscriptionid))
	if size < 0 {
		return make([]byte, 0), errors.New("e2ap wrapper is unable to set Subscription Request Sequence Number due to wrong or invalid payload")
	}
	newPayload = C.GoBytes(cptr, (C.int(size)+7)/8)
	return
}

func (c *E2ap) SetSubscriptionRequestPayload(payload []byte, ricRequestorID uint16, ricRequestSequenceNumber uint16, ranFunctionID uint16, eventTriggerDefinition []byte, eventTriggerDefinitionSize int, actionCount int, actionIds []int64, actionTypes []int64, actionDefinitions []ActionDefinition, subsequentActions []SubsequentAction) (newPayload []byte, err error) {
	cptr := unsafe.Pointer(&payload[0])
	eventTrigger := unsafe.Pointer(&eventTriggerDefinition[0])
	actIds := unsafe.Pointer(&actionIds[0])
	actTypes := unsafe.Pointer(&actionTypes[0])

	count := len(actionDefinitions)
	actDefs := (*C.RICactionDefinition)(C.calloc(C.size_t(len(actionDefinitions)), C.sizeof_RICactionDefinition))
	for index := 0; index < count; index++ {
		ptr := *(*C.RICactionDefinition)(unsafe.Pointer((uintptr)(unsafe.Pointer(actDefs)) + (uintptr)(C.sizeof_RICactionDefinition*C.int(index))))
		ptr.size = C.int(actionDefinitions[index].Size)
		if ptr.size != 0 {
			ptr.actionDefinition = (*C.uint8_t)(C.CBytes(actionDefinitions[index].Buf))
		}
	}
	defer C.free(unsafe.Pointer(actDefs))

	count = len(subsequentActions)
	subActs := (*C.RICSubsequentAction)(C.calloc(C.size_t(len(subsequentActions)), C.sizeof_RICSubsequentAction))
	for index := 0; index < count; index++ {
		ptr := *(*C.RICSubsequentAction)(unsafe.Pointer((uintptr)(unsafe.Pointer(subActs)) + (uintptr)(C.sizeof_RICSubsequentAction*C.int(index))))
		ptr.isValid = C.int(subsequentActions[index].IsValid)
		ptr.subsequentActionType = C.long(subsequentActions[index].SubsequentActionType)
		ptr.timeToWait = C.long(subsequentActions[index].TimeToWait)
	}
	defer C.free(unsafe.Pointer(subActs))

	size := C.e2ap_encode_ric_subscription_request_message(cptr, C.size_t(len(payload)), C.long(ricRequestorID), C.long(ricRequestSequenceNumber), C.long(ranFunctionID), eventTrigger, C.size_t(eventTriggerDefinitionSize), C.int(actionCount), (*C.long)(actIds), (*C.long)(actTypes), actDefs, subActs)
	if size < 0 {
		return make([]byte, 0), errors.New("e2ap wrapper is unable to set Subscription Request Payload due to wrong or invalid payload")
	}
	newPayload = C.GoBytes(cptr, (C.int(size)+7)/8)
	return
}

/* RICsubscriptionResponse */

func (c *E2ap) GetSubscriptionResponseSequenceNumber(payload []byte) (subId uint16, err error) {
	cptr := unsafe.Pointer(&payload[0])
	cret := C.e2ap_get_ric_subscription_response_sequence_number(cptr, C.size_t(len(payload)))
	if cret < 0 {
		return 0, errors.New("e2ap wrapper is unable to get Subscirption Response Sequence Number due to wrong or invalid payload")
	}
	subId = uint16(cret)
	return
}

func (c *E2ap) SetSubscriptionResponseSequenceNumber(payload []byte, newSubscriptionid uint16) (newPayload []byte, err error) {
	cptr := unsafe.Pointer(&payload[0])
	size := C.e2ap_set_ric_subscription_response_sequence_number(cptr, C.size_t(len(payload)), C.long(newSubscriptionid))
	if size < 0 {
		return make([]byte, 0), errors.New("e2ap wrapper is unable to set Subscription Response Sequence Number due to wrong or invalid payload")
	}
	newPayload = C.GoBytes(cptr, (C.int(size)+7)/8)
	return
}

func (c *E2ap) GetSubscriptionResponseMessage(payload []byte) (decodedMsg *DecodedSubscriptionResponseMessage, err error) {
	cptr := unsafe.Pointer(&payload[0])
	decodedMsg = &DecodedSubscriptionResponseMessage{}
	decodedCMsg := C.e2ap_decode_ric_subscription_response_message(cptr, C.size_t(len(payload)))
	defer C.free(unsafe.Pointer(decodedCMsg))

	if decodedCMsg == nil {
		return decodedMsg, errors.New("e2ap wrapper is unable to decode subscription response message due to wrong or invalid payload")
	}

	decodedMsg.RequestID = int32(decodedCMsg.requestorID)
	decodedMsg.RequestSequenceNumber = int32(decodedCMsg.requestSequenceNumber)
	decodedMsg.FuncID = int32(decodedCMsg.ranfunctionID)

	admittedCount := int(decodedCMsg.ricActionAdmittedList.count)
	for index := 0; index < admittedCount; index++ {
		decodedMsg.ActionAdmittedList.ActionID[index] = int32(decodedCMsg.ricActionAdmittedList.ricActionID[index])
	}
	decodedMsg.ActionAdmittedList.Count = admittedCount

	notAdmittedCount := int(decodedCMsg.ricActionNotAdmittedList.count)
	for index := 0; index < notAdmittedCount; index++ {
		decodedMsg.ActionNotAdmittedList.ActionID[index] = int32(decodedCMsg.ricActionNotAdmittedList.ricActionID[index])
		decodedMsg.ActionNotAdmittedList.Cause[index].CauseType = int32(decodedCMsg.ricActionNotAdmittedList.ricCause[index].ricCauseType)
		decodedMsg.ActionNotAdmittedList.Cause[index].CauseID = int32(decodedCMsg.ricActionNotAdmittedList.ricCause[index].ricCauseID)
	}
	decodedMsg.ActionNotAdmittedList.Count = notAdmittedCount

	return
}

/* RICsubscriptionFailure */

func (c *E2ap) GetSubscriptionFailureSequenceNumber(payload []byte) (subId uint16, err error) {
	cptr := unsafe.Pointer(&payload[0])
	cret := C.e2ap_get_ric_subscription_failure_sequence_number(cptr, C.size_t(len(payload)))
	if cret < 0 {
		return 0, errors.New("e2ap wrapper is unable to get Subscirption Failure Sequence Number due to wrong or invalid payload")
	}
	subId = uint16(cret)
	return
}

/* RICsubscriptionDeleteRequest */

func (c *E2ap) GetSubscriptionDeleteRequestSequenceNumber(payload []byte) (subId uint16, err error) {
	cptr := unsafe.Pointer(&payload[0])
	cret := C.e2ap_get_ric_subscription_delete_request_sequence_number(cptr, C.size_t(len(payload)))
	if cret < 0 {
		return 0, errors.New("e2ap wrapper is unable to get Subscirption Delete Request Sequence Number due to wrong or invalid payload")
	}
	subId = uint16(cret)
	return
}

func (c *E2ap) SetSubscriptionDeleteRequestSequenceNumber(payload []byte, newSubscriptionid uint16) (newPayload []byte, err error) {
	cptr := unsafe.Pointer(&payload[0])
	size := C.e2ap_set_ric_subscription_delete_request_sequence_number(cptr, C.size_t(len(payload)), C.long(newSubscriptionid))
	if size < 0 {
		return make([]byte, 0), errors.New("e2ap wrapper is unable to set Subscription Delete Request Sequence Number due to wrong or invalid payload")
	}
	newPayload = C.GoBytes(cptr, (C.int(size)+7)/8)
	return
}

func (c *E2ap) SetSubscriptionDeleteRequestPayload(payload []byte, ricRequestorID uint16, ricRequestSequenceNumber uint16, ranFunctionID uint16) (newPayload []byte, err error) {
	cptr := unsafe.Pointer(&payload[0])
	size := C.e2ap_encode_ric_subscription_delete_request_message(cptr, C.size_t(len(payload)), C.long(ricRequestorID), C.long(ricRequestSequenceNumber), C.long(ranFunctionID))
	if size < 0 {
		return make([]byte, 0), errors.New("e2ap wrapper is unable to set Subscription Delete Request Payload due to wrong or invalid payload")
	}
	newPayload = C.GoBytes(cptr, (C.int(size)+7)/8)
	return
}

/* RICsubscriptionDeleteResponse */

func (c *E2ap) GetSubscriptionDeleteResponseSequenceNumber(payload []byte) (subId uint16, err error) {
	cptr := unsafe.Pointer(&payload[0])
	cret := C.e2ap_get_ric_subscription_delete_response_sequence_number(cptr, C.size_t(len(payload)))
	if cret < 0 {
		return 0, errors.New("e2ap wrapper is unable to get Subscirption Delete Response Sequence Number due to wrong or invalid payload")
	}
	subId = uint16(cret)
	return
}

func (c *E2ap) SetSubscriptionDeleteResponseSequenceNumber(payload []byte, newSubscriptionid uint16) (newPayload []byte, err error) {
	cptr := unsafe.Pointer(&payload[0])
	size := C.e2ap_set_ric_subscription_delete_response_sequence_number(cptr, C.size_t(len(payload)), C.long(newSubscriptionid))
	if size < 0 {
		return make([]byte, 0), errors.New("e2ap wrapper is unable to set Subscription Delete Response Sequence Number due to wrong or invalid payload")
	}
	newPayload = C.GoBytes(cptr, (C.int(size)+7)/8)
	return
}

/* RICsubscriptionDeleteFailure */

func (c *E2ap) GetSubscriptionDeleteFailureSequenceNumber(payload []byte) (subId uint16, err error) {
	cptr := unsafe.Pointer(&payload[0])
	cret := C.e2ap_get_ric_subscription_delete_failure_sequence_number(cptr, C.size_t(len(payload)))
	if cret < 0 {
		return 0, errors.New("e2ap wrapper is unable to get Subscirption Failure Sequence Number due to wrong or invalid payload")
	}
	subId = uint16(cret)
	return
}

/* RICindication */

func (c *E2ap) GetIndicationMessage(payload []byte) (decodedMsg *DecodedIndicationMessage, err error) {
	cptr := unsafe.Pointer(&payload[0])
	decodedMsg = &DecodedIndicationMessage{}
	decodedCMsg := C.e2ap_decode_ric_indication_message(cptr, C.size_t(len(payload)))
	if decodedCMsg == nil {
		return decodedMsg, errors.New("e2ap wrapper is unable to decode indication message due to wrong or invalid payload")
	}
	defer C.e2ap_free_decoded_ric_indication_message(decodedCMsg)

	decodedMsg.RequestID = int32(decodedCMsg.requestorID)
	decodedMsg.RequestSequenceNumber = int32(decodedCMsg.requestSequenceNumber)
	decodedMsg.FuncID = int32(decodedCMsg.ranfunctionID)
	decodedMsg.ActionID = int32(decodedCMsg.actionID)
	decodedMsg.IndSN = int32(decodedCMsg.indicationSN)
	decodedMsg.IndType = int32(decodedCMsg.indicationType)
	indhdr := unsafe.Pointer(decodedCMsg.indicationHeader)
	decodedMsg.IndHeader = C.GoBytes(indhdr, C.int(decodedCMsg.indicationHeaderSize))
	decodedMsg.IndHeaderLength = int32(decodedCMsg.indicationHeaderSize)
	indmsg := unsafe.Pointer(decodedCMsg.indicationMessage)
	decodedMsg.IndMessage = C.GoBytes(indmsg, C.int(decodedCMsg.indicationMessageSize))
	decodedMsg.IndMessageLength = int32(decodedCMsg.indicationMessageSize)
	callproc := unsafe.Pointer(decodedCMsg.callProcessID)
	decodedMsg.CallProcessID = C.GoBytes(callproc, C.int(decodedCMsg.callProcessIDSize))
	decodedMsg.CallProcessIDLength = int32(decodedCMsg.callProcessIDSize)
	return
}