/*
   Copyright 2017 the original author or authors.

   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 openflow

import (
	"encoding/json"
	"log"
	"unsafe"

	"github.com/donNewtonAlpha/goloxi"
	ofp "github.com/donNewtonAlpha/goloxi/of13"
	"github.com/opencord/voltha-protos/v2/go/openflow_13"
	pb "github.com/opencord/voltha-protos/v2/go/voltha"
)

func parseOxm(ofbField *openflow_13.OfpOxmOfbField) (goloxi.IOxm, uint16) {
	log.Printf("PARSE OXM")
	switch ofbField.Type {
	case pb.OxmOfbFieldTypes_OFPXMT_OFB_IN_PORT:
		ofpInPort := ofp.NewOxmInPort()
		val := ofbField.GetValue().(*openflow_13.OfpOxmOfbField_Port)
		ofpInPort.Value = ofp.Port(val.Port)
		return ofpInPort, 4
	case pb.OxmOfbFieldTypes_OFPXMT_OFB_ETH_TYPE:
		ofpEthType := ofp.NewOxmEthType()
		val := ofbField.GetValue().(*openflow_13.OfpOxmOfbField_EthType)
		ofpEthType.Value = ofp.EthernetType(val.EthType)
		return ofpEthType, 2
	case pb.OxmOfbFieldTypes_OFPXMT_OFB_IN_PHY_PORT:
		ofpInPhyPort := ofp.NewOxmInPhyPort()
		val := ofbField.GetValue().(*openflow_13.OfpOxmOfbField_PhysicalPort)
		ofpInPhyPort.Value = ofp.Port(val.PhysicalPort)
		return ofpInPhyPort, 4
	case pb.OxmOfbFieldTypes_OFPXMT_OFB_IP_PROTO:
		ofpIpProto := ofp.NewOxmIpProto()
		val := ofbField.GetValue().(*openflow_13.OfpOxmOfbField_IpProto)
		ofpIpProto.Value = ofp.IpPrototype(val.IpProto)
		return ofpIpProto, 1
	case pb.OxmOfbFieldTypes_OFPXMT_OFB_UDP_SRC:
		ofpUdpSrc := ofp.NewOxmUdpSrc()
		val := ofbField.GetValue().(*openflow_13.OfpOxmOfbField_UdpSrc)
		ofpUdpSrc.Value = uint16(val.UdpSrc)
		return ofpUdpSrc, 2
	case pb.OxmOfbFieldTypes_OFPXMT_OFB_UDP_DST:
		ofpUdpDst := ofp.NewOxmUdpDst()
		val := ofbField.GetValue().(*openflow_13.OfpOxmOfbField_UdpDst)
		ofpUdpDst.Value = uint16(val.UdpDst)
		return ofpUdpDst, 2
	case pb.OxmOfbFieldTypes_OFPXMT_OFB_VLAN_VID:
		ofpVlanVid := ofp.NewOxmVlanVid()
		val := ofbField.GetValue()
		if val != nil {
			vlanId := val.(*openflow_13.OfpOxmOfbField_VlanVid)
			ofpVlanVid.Value = uint16(vlanId.VlanVid) | 0x1000
		} else {
			ofpVlanVid.Value = uint16(0)
		}
		js, _ := json.Marshal(ofpVlanVid)
		log.Printf("PARSE OXM VLAN VID %s", js)
		return ofpVlanVid, 2
	case pb.OxmOfbFieldTypes_OFPXMT_OFB_METADATA:
		ofpMetadata := ofp.NewOxmMetadata()
		val := ofbField.GetValue().(*openflow_13.OfpOxmOfbField_TableMetadata)
		ofpMetadata.Value = val.TableMetadata
		return ofpMetadata, 8
	default:
		log.Printf("handleFlowStatsRequest   Unhandled OxmField %v", ofbField.Type)
	}
	return nil, 0
}
func parseInstructions(ofpInstruction *openflow_13.OfpInstruction) (ofp.IInstruction, uint16) {
	instType := ofpInstruction.Type
	data := ofpInstruction.GetData()
	switch instType {
	case ofp.OFPITWriteMetadata:
		instruction := ofp.NewInstructionWriteMetadata()
		instruction.Len = 24
		metadata := data.(*openflow_13.OfpInstruction_WriteMetadata).WriteMetadata
		instruction.Metadata = uint64(metadata.Metadata)
		return instruction, 24
	case ofp.OFPITMeter:
		instruction := ofp.NewInstructionMeter()
		instruction.Len = 8
		meter := data.(*openflow_13.OfpInstruction_Meter).Meter
		instruction.MeterId = meter.MeterId
		return instruction, 8
	case ofp.OFPITGotoTable:
		instruction := ofp.NewInstructionGotoTable()
		instruction.Len = 8
		gotoTable := data.(*openflow_13.OfpInstruction_GotoTable).GotoTable
		instruction.TableId = uint8(gotoTable.TableId)
		return instruction, 8
	case ofp.OFPITApplyActions:
		instruction := ofp.NewInstructionApplyActions()
		var instructionSize uint16
		instructionSize = 8
		ofpActions := ofpInstruction.GetActions().Actions
		var actions []goloxi.IAction
		for i := 0; i < len(ofpActions); i++ {
			ofpAction := ofpActions[i]
			action, actionSize := parseAction(ofpAction)
			js, _ := json.Marshal(action)
			log.Printf("ACTION size(%d) value %s", actionSize, js)
			actions = append(actions, action)
			instructionSize += actionSize
			mySize := unsafe.Sizeof(*instruction)
			log.Printf("Calculated Size %d Measured size %d", instructionSize, mySize)

		}
		instruction.Actions = actions
		instruction.SetLen(instructionSize)
		js, _ := json.Marshal(instruction)
		log.Printf("INSTRUCTION %s", js)
		return instruction, instructionSize
	}
	//shouldn't have reached here :<
	js, _ := json.Marshal(ofpInstruction)
	log.Printf("Parse Instruction Failed ofpInstruction : %s", js)
	return nil, 0
}
func parseAction(ofpAction *openflow_13.OfpAction) (goloxi.IAction, uint16) {
	js, _ := json.Marshal(ofpAction)
	log.Printf("ACTION BEFORE %s", js)
	switch ofpAction.Type {
	case openflow_13.OfpActionType_OFPAT_OUTPUT:
		ofpOutputAction := ofpAction.GetOutput()
		outputAction := ofp.NewActionOutput()
		outputAction.Port = ofp.Port(ofpOutputAction.Port)
		outputAction.MaxLen = uint16(ofpOutputAction.MaxLen)
		outputAction.Len = 16
		return outputAction, 16
	case openflow_13.OfpActionType_OFPAT_PUSH_VLAN:
		ofpPushVlanAction := ofp.NewActionPushVlan()
		ofpPushVlanAction.Ethertype = uint16(ofpAction.GetPush().Ethertype)
		ofpPushVlanAction.Len = 8
		return ofpPushVlanAction, 8
	case openflow_13.OfpActionType_OFPAT_POP_VLAN:
		ofpPopVlanAction := ofp.NewActionPopVlan()
		ofpPopVlanAction.Len = 8
		return ofpPopVlanAction, 8
	case openflow_13.OfpActionType_OFPAT_SET_FIELD:
		ofpActionSetField := ofpAction.GetSetField()
		setFieldAction := ofp.NewActionSetField()

		iOxm, _ := parseOxm(ofpActionSetField.GetField().GetOfbField())
		setFieldAction.Field = iOxm
		setFieldAction.Len = 16
		return setFieldAction, 16
	default:
		js, _ := json.Marshal(ofpAction)
		log.Printf("UNKNOWN ACTION %s", js)
	}
	return nil, 0
}
func parsePortStats(port *pb.LogicalPort) ofp.PortStatsEntry {
	stats := port.OfpPortStats
	port.OfpPort.GetPortNo()
	var entry ofp.PortStatsEntry
	entry.SetPortNo(ofp.Port(port.OfpPort.GetPortNo()))
	entry.SetRxPackets(stats.GetRxPackets())
	entry.SetTxPackets(stats.GetTxPackets())
	entry.SetRxBytes(stats.GetRxBytes())
	entry.SetTxBytes(stats.GetTxBytes())
	entry.SetRxDropped(stats.GetRxDropped())
	entry.SetTxDropped(stats.GetTxDropped())
	entry.SetRxErrors(stats.GetRxErrors())
	entry.SetTxErrors(stats.GetTxErrors())
	entry.SetRxFrameErr(stats.GetRxFrameErr())
	entry.SetRxOverErr(stats.GetRxOverErr())
	entry.SetRxCrcErr(stats.GetRxCrcErr())
	entry.SetCollisions(stats.GetCollisions())
	entry.SetDurationSec(stats.GetDurationSec())
	entry.SetDurationNsec(stats.GetDurationNsec())
	return entry
}