/*
 * Copyright (c) Contributors to the Open 3D Engine Project.
 * For complete copyright and license terms please see the LICENSE at the root of this distribution.
 *
 * SPDX-License-Identifier: Apache-2.0 OR MIT
 *
 */

#pragma once

#include <AzCore/EBus/EBus.h>
#include <AzCore/Math/Uuid.h>
#include <AzCore/std/smart_ptr/shared_ptr.h>
#include <AzCore/std/string/string.h>
#include <AzCore/std/containers/unordered_set.h>
#include <SceneAPI/SceneCore/SceneCoreConfiguration.h>
#include <SceneAPI/SceneCore/Events/ProcessingResult.h>
#include <AzCore/Interface/Interface.h>

namespace AZ
{
    namespace SceneAPI
    {
        namespace Containers
        {
            class Scene;
        }
        namespace Events
        {
            enum class LoadingResult
            {
                Ignored,
                AssetLoaded,
                ManifestLoaded,
                AssetFailure,
                ManifestFailure
            };

            class AssetImportRequest;

            struct AssetImportRequestReporter
            {
                AZ_RTTI(AssetImportRequestReporter, "{3BCEDF5C-9FE6-4A16-A521-D2362E51522F}");

                virtual void ReportStart(const AssetImportRequest* instance) = 0;
                virtual void ReportFinish(const AssetImportRequest* instance) = 0;
            };

            struct AssetImportRequestEventProcessingPolicy
            {
                template<class Interface>
                static void ReportStart(Interface&& iface)
                {
                    if (auto* reporter = AZ::Interface<AssetImportRequestReporter>::Get(); reporter)
                    {
                        reporter->ReportStart(static_cast<const AssetImportRequest*>(iface));
                    }
                }

                template<class Interface>
                static void ReportFinish(Interface&& iface)
                {
                    if (auto* reporter = AZ::Interface<AssetImportRequestReporter>::Get(); reporter)
                    {
                        reporter->ReportFinish(static_cast<const AssetImportRequest*>(iface));
                    }
                }

                template<class Results, class Function, class Interface, class... InputArgs>
                static void CallResult(Results& results, Function&& func, Interface&& iface, InputArgs&&... args)
                {
                    ReportStart(iface);
                    results = AZStd::invoke(AZStd::forward<Function>(func), AZStd::forward<Interface>(iface), AZStd::forward<InputArgs>(args)...);
                    ReportFinish(iface);
                }

                template<class Function, class Interface, class... InputArgs>
                static void Call(Function&& func, Interface&& iface, InputArgs&&... args)
                {
                    ReportStart(iface);
                    AZStd::invoke(AZStd::forward<Function>(func), AZStd::forward<Interface>(iface), AZStd::forward<InputArgs>(args)...);
                    ReportFinish(iface);
                }
            };

            class SCENE_CORE_API LoadingResultCombiner
            {
            public:
                LoadingResultCombiner();
                void operator= (LoadingResult rhs);
                ProcessingResult GetManifestResult() const;
                ProcessingResult GetAssetResult() const;

            private:
                ProcessingResult m_manifestResult;
                ProcessingResult m_assetResult;
            };

            class SCENE_CORE_API AssetImportRequest
                : public AZ::EBusTraits
            {
            public:
                enum RequestingApplication
                {
                    Generic,
                    Editor,
                    AssetProcessor
                };
                enum ManifestAction
                {
                    Update,
                    ConstructDefault
                };

                static const AZ::EBusHandlerPolicy HandlerPolicy = AZ::EBusHandlerPolicy::Multiple;
                using MutexType = AZStd::recursive_mutex;
                using EventProcessingPolicy = AssetImportRequestEventProcessingPolicy;

                static AZ::Crc32 GetAssetImportRequestComponentTag()
                {
                    return AZ_CRC_CE("AssetImportRequest");
                }
                
                virtual ~AssetImportRequest() = 0;

                //! Fills the given list with all available file extensions, excluding the extension for the manifest.
                virtual void GetSupportedFileExtensions(AZStd::unordered_set<AZStd::string>& extensions);
                //! Gets the file extension for the manifest.
                virtual void GetManifestExtension(AZStd::string& result);
                //! Gets the file extension for the generated manifest.
                virtual void GetGeneratedManifestExtension(AZStd::string& result);
                //! Gets the label for a scene builder using this HandlerPolicy
                virtual void GetPolicyName(AZStd::string& result) const;

                //! Before asset loading starts this is called to allow for any required initialization.
                virtual ProcessingResult PrepareForAssetLoading(Containers::Scene& scene, RequestingApplication requester);
                //! Starts the loading of the asset at the given path in the given scene. Loading optimizations can be applied based on
                //! the calling application.
                virtual LoadingResult LoadAsset(Containers::Scene& scene, const AZStd::string& path, const Uuid& guid, RequestingApplication requester);
                //! FinalizeAssetLoading can be used to do any work to complete loading, such as complete asynchronous loading
                //! or adjust the loaded content in the SceneGraph. While manifest changes can be done here as well, it's
                //! recommended to wait for the UpdateManifest call.
                virtual void FinalizeAssetLoading(Containers::Scene& scene, RequestingApplication requester);
                //! After all loading has completed, this call can be used to make adjustments to the manifest. Based on the given
                //! action this can mean constructing a new manifest or updating an existing manifest. This call is intended
                //! to deal with any default behavior of the manifest.
                virtual ProcessingResult UpdateManifest(Containers::Scene& scene, ManifestAction action, RequestingApplication requester);

                // Get scene processing project setting: UseCustomNormal 
                virtual void AreCustomNormalsUsed(bool & value);

                /*!
                    Optional method for reporting source file dependencies that may exist in the scene manifest
                    Paths is a vector of JSON Path strings, relative to the IRule object
                    For example, the following path: /scriptFilename
                    Would match with this manifest:
                
                    {
                        "values": [
                            {
                                "$type": "Test",
                                "scriptFilename": "file.py"
                            }
                        ]
                    }
                 */
                virtual void GetManifestDependencyPaths(AZStd::vector<AZStd::string>& paths);

                //! Utility function to load an asset and manifest from file by using the EBus functions above.
                //! @param assetFilePath The absolute path to the source file (not the manifest).
                //! @param sourceGuid The guid assigned to the source file (not the manifest).
                //! @param requester The application making the request to load the file. This can be used to optimize the type and amount of data to load.
                //! @param loadingComponentUuid The UUID assigned to the loading component.
                //! @param watchFolder is the scan folder that it was found inside
                static AZStd::shared_ptr<Containers::Scene> LoadSceneFromVerifiedPath(
                    const AZStd::string& assetFilePath,
                    const Uuid& sourceGuid,
                    RequestingApplication requester,
                    const Uuid& loadingComponentUuid,
                    const AZStd::string& watchFolder);

                //! Utility function to determine if a given file path points to a scene manifest file (.assetinfo).
                //! @param filePath A relative or absolute path to the file to check.
                static bool IsManifestExtension(const char* filePath);
                //! Utility function to determine if a given file path points to a scene file (for instance .fbx).
                //! @param filePath A relative or absolute path to the file to check.
                static bool IsSceneFileExtension(const char* filePath);
            };

            using AssetImportRequestBus = AZ::EBus<AssetImportRequest>;

            inline AssetImportRequest::~AssetImportRequest() = default;

            //! Queue EBus to resolve events during the scene import phases
            class SCENE_CORE_API AssetPostImportRequest
                : public AZ::EBusTraits
            {
            public:
                using MutexType = AZStd::recursive_mutex;
                using EventQueueMutexType = AZStd::recursive_mutex;
                static constexpr bool EnableEventQueue = true;

                virtual void CallAfterSceneExport(AZStd::function<void()> callback) = 0;
            };
            using AssetPostImportRequestBus = AZ::EBus<AssetPostImportRequest>;

        } // namespace Events
    } // namespace SceneAPI
} // namespace AZ