/*
* All or portions of this file Copyright (c) Amazon.com, Inc. or its affiliates or
* its licensors.
*
* For complete copyright and license terms please see the LICENSE at the root of this
* distribution (the "License"). All use of this software is governed by the License,
* or, if provided, by the license below or the license accompanying this file. Do not
* remove or modify any license notices. This file is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
*
*/
#include <SceneAPI/FbxSceneBuilder/Importers/AssImpTransformImporter.h>

#include <AzCore/std/smart_ptr/make_shared.h>
#include <AzCore/Serialization/SerializeContext.h>
#include <AzToolsFramework/Debug/TraceContext.h>
#include <SceneAPI/FbxSceneBuilder/FbxSceneSystem.h>
#include <SceneAPI/FbxSceneBuilder/Importers/ImporterUtilities.h>
#include <SceneAPI/FbxSceneBuilder/Importers/Utilities/RenamedNodesMap.h>
#include <SceneAPI/SceneCore/Utilities/Reporting.h>
#include <SceneAPI/SceneData/GraphData/TransformData.h>
#include <SceneAPI/SDKWrapper/AssImpTypeConverter.h>
#include <SceneAPI/SDKWrapper/AssImpNodeWrapper.h>
#include <SceneAPI/SDKWrapper/AssImpSceneWrapper.h>
#include <assimp/scene.h>
#include <SceneAPI/FbxSceneBuilder/Importers/AssImpImporterUtilities.h>

namespace AZ
{
    namespace SceneAPI
    {
        namespace FbxSceneBuilder
        {
            const char* AssImpTransformImporter::s_transformNodeName = "transform";

            AssImpTransformImporter::AssImpTransformImporter()
            {
                BindToCall(&AssImpTransformImporter::ImportTransform);
            }

            void AssImpTransformImporter::Reflect(ReflectContext* context)
            {
                SerializeContext* serializeContext = azrtti_cast<SerializeContext*>(context);
                if (serializeContext)
                {
                    serializeContext->Class<AssImpTransformImporter, SceneCore::LoadingComponent>()->Version(1);
                }
            }

            void GetAllBones(const aiScene* scene, AZStd::unordered_map<AZStd::string, const aiBone*>& boneLookup)
            {
                for (unsigned meshIndex = 0; meshIndex < scene->mNumMeshes; ++meshIndex)
                {
                    const aiMesh* mesh = scene->mMeshes[meshIndex];

                    for (unsigned boneIndex = 0; boneIndex < mesh->mNumBones; ++boneIndex)
                    {
                        const aiBone* bone = mesh->mBones[boneIndex];

                        boneLookup[bone->mName.C_Str()] = bone;
                    }
                }
            }

            Events::ProcessingResult AssImpTransformImporter::ImportTransform(AssImpSceneNodeAppendedContext& context)
            {
                AZ_TraceContext("Importer", "transform");
                const aiNode* currentNode = context.m_sourceNode.GetAssImpNode();
                const aiScene* scene = context.m_sourceScene.GetAssImpScene();

                if (currentNode == scene->mRootNode || IsPivotNode(currentNode->mName))
                {
                    return Events::ProcessingResult::Ignored;
                }

                AZStd::unordered_map<AZStd::string, const aiBone*> boneLookup;
                GetAllBones(scene, boneLookup);

                auto boneIterator = boneLookup.find(currentNode->mName.C_Str());
                const bool isBone = boneIterator != boneLookup.end();

                aiMatrix4x4 combinedTransform;

                if (isBone)
                {
                    auto parentNode = currentNode->mParent;

                    aiMatrix4x4 offsetMatrix = boneIterator->second->mOffsetMatrix;
                    aiMatrix4x4 parentOffset {};

                    auto parentBoneIterator = boneLookup.find(parentNode->mName.C_Str());

                    if (parentNode && parentBoneIterator != boneLookup.end())
                    {
                        const auto& parentBone = parentBoneIterator->second;

                        parentOffset = parentBone->mOffsetMatrix;
                    }

                    auto inverseOffset = offsetMatrix;
                    inverseOffset.Inverse();

                    combinedTransform = parentOffset * inverseOffset;
                }
                else
                {
                    combinedTransform = GetConcatenatedLocalTransform(currentNode);
                }

                DataTypes::MatrixType localTransform = AssImpSDKWrapper::AssImpTypeConverter::ToTransform(combinedTransform);

                context.m_sourceSceneSystem.SwapTransformForUpAxis(localTransform);
                context.m_sourceSceneSystem.ConvertUnit(localTransform);

                AZStd::shared_ptr<SceneData::GraphData::TransformData> transformData =
                    AZStd::make_shared<SceneData::GraphData::TransformData>(localTransform);
                AZ_Error(SceneAPI::Utilities::ErrorWindow, transformData, "Failed to allocate transform data.");
                if (!transformData)
                {
                    return Events::ProcessingResult::Failure;
                }

                // If it is non-endpoint data populated node, add a transform attribute
                if (context.m_scene.GetGraph().HasNodeContent(context.m_currentGraphPosition))
                {
                    if (!context.m_scene.GetGraph().IsNodeEndPoint(context.m_currentGraphPosition))
                    {
                        AZStd::string nodeName = s_transformNodeName;
                        RenamedNodesMap::SanitizeNodeName(nodeName, context.m_scene.GetGraph(), context.m_currentGraphPosition);
                        AZ_TraceContext("Transform node name", nodeName);

                        Containers::SceneGraph::NodeIndex newIndex =
                            context.m_scene.GetGraph().AddChild(context.m_currentGraphPosition, nodeName.c_str());

                        AZ_Error(SceneAPI::Utilities::ErrorWindow, newIndex.IsValid(), "Failed to create SceneGraph node for attribute.");
                        if (!newIndex.IsValid())
                        {
                            return Events::ProcessingResult::Failure;
                        }

                        Events::ProcessingResult transformAttributeResult;
                        AssImpSceneAttributeDataPopulatedContext dataPopulated(context, transformData, newIndex, nodeName);
                        transformAttributeResult = Events::Process(dataPopulated);

                        if (transformAttributeResult != Events::ProcessingResult::Failure)
                        {
                            transformAttributeResult = AddAttributeDataNodeWithContexts(dataPopulated);
                        }

                        return transformAttributeResult;
                    }
                }
                else
                {
                    bool addedData = context.m_scene.GetGraph().SetContent(context.m_currentGraphPosition, transformData);

                    AZ_Error(SceneAPI::Utilities::ErrorWindow, addedData, "Failed to add node data");
                    return addedData ? Events::ProcessingResult::Success : Events::ProcessingResult::Failure;
                }

                return Events::ProcessingResult::Ignored;
            }
        } // namespace FbxSceneBuilder
    } // namespace SceneAPI
} // namespace AZ