/*
 * Copyright (c) 2018 - present.  Boling Consulting Solutions (bcsw.net)
 * Copyright 2020-present Open Networking Foundation

 * 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 meframe_test

import (
	"github.com/google/gopacket"
	. "github.com/opencord/omci-lib-go"
	me "github.com/opencord/omci-lib-go/generated"
	"github.com/opencord/omci-lib-go/meframe"
	"github.com/stretchr/testify/assert"
	"math/rand"
	"testing"
)

func testCreateRequestTypeMeFrame(t *testing.T, managedEntity *me.ManagedEntity, messageSet DeviceIdent) {
	// Generate the frame. Use a default Entity ID of zero, but for the
	// OMCI library, we need to specify all supported Set-By-Create
	params := me.ParamData{
		EntityID:   uint16(0),
		Attributes: make(me.AttributeValueMap, 0),
	}
	for _, attrDef := range managedEntity.GetAttributeDefinitions() {
		if attrDef.Index == 0 {
			continue // Skip entity ID, already specified

		} else if attrDef.GetAccess().Contains(me.SetByCreate) {
			params.Attributes[attrDef.GetName()] = pickAValue(attrDef)
		}
	}
	// Create the managed instance
	meInstance, err := me.NewManagedEntity(managedEntity.GetManagedEntityDefinition(), params)
	tid := uint16(rand.Int31n(0xFFFE) + 1) // [1, 0xFFFF]
	assert.NotNil(t, err)
	assert.Equal(t, err.StatusCode(), me.Success)

	frame, omciErr := meframe.GenFrame(meInstance, CreateRequestType, meframe.TransactionID(tid), meframe.FrameFormat(messageSet))
	assert.NotNil(t, frame)
	assert.NotZero(t, len(frame))
	assert.Nil(t, omciErr)

	///////////////////////////////////////////////////////////////////
	// Now decode and compare
	packet := gopacket.NewPacket(frame, LayerTypeOMCI, gopacket.NoCopy)
	assert.NotNil(t, packet)

	omciLayer := packet.Layer(LayerTypeOMCI)
	assert.NotNil(t, omciLayer)

	omciObj, omciOk := omciLayer.(*OMCI)
	assert.NotNil(t, omciObj)
	assert.True(t, omciOk)
	assert.Equal(t, tid, omciObj.TransactionID)
	assert.Equal(t, CreateRequestType, omciObj.MessageType)
	assert.Equal(t, messageSet, omciObj.DeviceIdentifier)

	msgLayer := packet.Layer(LayerTypeCreateRequest)
	assert.NotNil(t, msgLayer)

	msgObj, msgOk := msgLayer.(*CreateRequest)
	assert.NotNil(t, msgObj)
	assert.True(t, msgOk)

	assert.Equal(t, meInstance.GetClassID(), msgObj.EntityClass)
	assert.Equal(t, meInstance.GetEntityID(), msgObj.EntityInstance)
	assert.Equal(t, meInstance.GetAttributeValueMap(), msgObj.Attributes)
}

func testCreateResponseTypeMeFrame(t *testing.T, managedEntity *me.ManagedEntity, messageSet DeviceIdent) {
	params := me.ParamData{
		EntityID: uint16(0),
	}
	// Create the managed instance
	meInstance, err := me.NewManagedEntity(managedEntity.GetManagedEntityDefinition(), params)
	assert.NotNil(t, err)
	assert.Equal(t, err.StatusCode(), me.Success)

	tid := uint16(rand.Int31n(0xFFFE) + 1) // [1, 0xFFFF]
	result := me.Results(rand.Int31n(7))   // [0, 6] Not all types will be tested

	// Always pass a failure mask, but should only get encoded if result == ParameterError
	var mask uint16
	for _, attrDef := range managedEntity.GetAttributeDefinitions() {
		if attrDef.Index == 0 {
			continue // Skip entity ID, already specified

		} else if attrDef.GetAccess().Contains(me.SetByCreate) {
			// Random 20% chance this parameter was bad
			if result == me.ParameterError && rand.Int31n(5) == 0 {
				mask |= attrDef.Mask
			}
		}
	}
	frame, omciErr := meframe.GenFrame(meInstance, CreateResponseType,
		meframe.TransactionID(tid), meframe.Result(result), meframe.AttributeExecutionMask(mask), meframe.FrameFormat(messageSet))
	assert.NotNil(t, frame)
	assert.NotZero(t, len(frame))
	assert.Nil(t, omciErr)

	///////////////////////////////////////////////////////////////////
	// Now decode and compare
	packet := gopacket.NewPacket(frame, LayerTypeOMCI, gopacket.NoCopy)
	assert.NotNil(t, packet)

	omciLayer := packet.Layer(LayerTypeOMCI)
	assert.NotNil(t, omciLayer)

	omciObj, omciOk := omciLayer.(*OMCI)
	assert.NotNil(t, omciObj)
	assert.True(t, omciOk)
	assert.Equal(t, tid, omciObj.TransactionID)
	assert.Equal(t, CreateResponseType, omciObj.MessageType)
	assert.Equal(t, messageSet, omciObj.DeviceIdentifier)

	msgLayer := packet.Layer(LayerTypeCreateResponse)
	assert.NotNil(t, msgLayer)

	msgObj, msgOk := msgLayer.(*CreateResponse)
	assert.NotNil(t, msgObj)
	assert.True(t, msgOk)

	assert.Equal(t, meInstance.GetClassID(), msgObj.EntityClass)
	assert.Equal(t, meInstance.GetEntityID(), msgObj.EntityInstance)
	assert.Equal(t, result, msgObj.Result)

	if result == me.ParameterError {
		assert.Equal(t, mask, msgObj.AttributeExecutionMask)
	} else {
		assert.Zero(t, msgObj.AttributeExecutionMask)
	}
}