1 files changed, 228 insertions, 0 deletions
diff --git a/src/brussel.engine/Level.cpp b/src/brussel.engine/Level.cpp
new file mode 100644
index 0000000..076e5d5
--- /dev/null
+++ b/src/brussel.engine/Level.cpp
@@ -0,0 +1,228 @@
+#include "Level.hpp"
+
+#include "AppConfig.hpp"
+
+#include <PodVector.hpp>
+#include <RapidJsonHelper.hpp>
+#include <ScopeGuard.hpp>
+#include <Utils.hpp>
+
+#include <imgui.h>
+#include <rapidjson/document.h>
+#include <rapidjson/filereadstream.h>
+#include <rapidjson/filewritestream.h>
+#include <rapidjson/prettywriter.h>
+#include <cstdio>
+#include <filesystem>
+
+using namespace std::literals;
+namespace fs = std::filesystem;
+
+constexpr auto kParentToRootObject = std::numeric_limits<size_t>::max();
+constexpr auto kInvalidEntryId = std::numeric_limits<size_t>::max();
+
+struct Level::InstanciationEntry {
+	// If set to std::numeric_limits<size_t>::max(), this object is parented to the "root" provided when instanciating
+	size_t parentId;
+	rapidjson::Document data;
+};
+
+Level::Level() = default;
+
+Level::~Level() = default;
+
+void Level::Instanciate(GameObject* relRoot) const {
+	auto objectsLut = std::make_unique<GameObject*[]>(mEntries.size());
+	for (auto& entry : mEntries) {
+		GameObject* parent;
+		if (entry.parentId == kParentToRootObject) {
+			parent = relRoot;
+		} else {
+			parent = objectsLut[entry.parentId];
+		}
+
+		// TODO deser object
+	}
+}
+
+void Level::ShowInstanciationEntries(IEditor& editor) {
+	for (auto& entry : mEntries) {
+		// TODO
+	}
+}
+
+void LevelManager::DiscoverFilesDesignatedLocation() {
+	auto path = AppConfig::assetDirPath / "Levels";
+	DiscoverFiles(path);
+}
+
+void LevelManager::DiscoverFiles(const std::filesystem::path& dir) {
+	for (auto& item : fs::directory_iterator(dir)) {
+		auto& path = item.path();
+		if (!item.is_regular_file()) {
+			continue;
+		}
+		if (path.extension() != ".json") {
+			continue;
+		}
+
+		// Parse uid from filename, map key
+		Uid uid;
+		uid.ReadString(path.filename().string());
+
+		// Map value
+		LoadableObject obj;
+		obj.filePath = path;
+
+		mObjByUid.try_emplace(uid, std::move(obj));
+	}
+}
+
+Level* LevelManager::FindLevel(const Uid& uid) const {
+	auto iter = mObjByUid.find(uid);
+	if (iter != mObjByUid.end()) {
+		return iter->second.level.Get();
+	} else {
+		return nullptr;
+	}
+}
+
+#define BRUSSEL_DEF_LEVEL_NAME "New Level"
+#define BRUSSEL_DEF_LEVEL_DESC "No description."
+
+Level* LevelManager::LoadLevel(const Uid& uid) {
+	auto iter = mObjByUid.find(uid);
+	if (iter != mObjByUid.end()) {
+		auto& ldObj = iter->second;
+		if (ldObj.level != nullptr) {
+			auto file = Utils::OpenCstdioFile(ldObj.filePath, Utils::Read, false);
+			if (!file) {
+				fprintf(stderr, "Cannot open file level file %s that was discovered on game startup.", ldObj.filePath.string().c_str());
+				return nullptr;
+			}
+			DEFER { fclose(file); };
+
+			char readerBuffer[65536];
+			rapidjson::FileReadStream stream(file, readerBuffer, sizeof(readerBuffer));
+
+			rapidjson::Document root;
+			root.ParseStream(stream);
+
+			Level* level;
+			ldObj.level.Attach(level = new Level());
+
+			level->mMan = this;
+			level->mUid = uid;
+
+#if defined(BRUSSEL_DEV_ENV)
+			BRUSSEL_JSON_GET_DEFAULT(root, "Name", std::string, ldObj.name, BRUSSEL_DEF_LEVEL_NAME);
+			BRUSSEL_JSON_GET_DEFAULT(root, "Description", std::string, ldObj.description, BRUSSEL_DEF_LEVEL_DESC)
+#endif
+
+			auto rvEntries = rapidjson::GetProperty(root, rapidjson::kArrayType, "DataEntries"sv);
+			if (!rvEntries) return nullptr;
+			for (auto iter = rvEntries->Begin(); iter != rvEntries->End(); ++iter) {
+				Level::InstanciationEntry entry;
+
+				BRUSSEL_JSON_GET_DEFAULT(*iter, "ParentId", int, entry.parentId, kInvalidEntryId);
+
+				auto rvDataEntry = rapidjson::GetProperty(*iter, "Data"sv);
+				if (!rvDataEntry) return nullptr;
+				entry.data.CopyFrom(*iter, entry.data.GetAllocator());
+
+				level->mEntries.push_back(std::move(entry));
+			}
+		}
+		return ldObj.level.Get();
+	} else {
+		return nullptr;
+	}
+}
+
+void LevelManager::PrepareLevel(const Uid& uid) {
+	// TODO
+}
+
+LevelManager::LoadableObject& LevelManager::AddLevel(const Uid& uid) {
+	auto&& [iter, inserted] = mObjByUid.try_emplace(uid);
+	auto& ldObj = iter->second;
+	ldObj.level->mUid = uid;
+#if defined(BRUSSEL_DEV_ENV)
+	ldObj.name = BRUSSEL_DEF_LEVEL_NAME;
+	ldObj.description = BRUSSEL_DEF_LEVEL_DESC;
+#endif
+	return ldObj;
+}
+
+void LevelManager::SaveLevel(const Uid& uid) const {
+	auto iter = mObjByUid.find(uid);
+	if (iter == mObjByUid.end()) return;
+	auto& obj = iter->second;
+
+	SaveLevelImpl(obj, obj.filePath);
+}
+
+void LevelManager::SaveLevel(const Uid& uid, const std::filesystem::path& path) const {
+	auto iter = mObjByUid.find(uid);
+	if (iter == mObjByUid.end()) return;
+	auto& obj = iter->second;
+
+	SaveLevelImpl(obj, path);
+}
+
+void LevelManager::SaveLevelImpl(const LoadableObject& obj, const std::filesystem::path& path) const {
+	rapidjson::Document root;
+
+	// TODO
+
+	auto file = Utils::OpenCstdioFile(path, Utils::WriteTruncate);
+	if (!file) return;
+	DEFER { fclose(file); };
+
+	char writerBuffer[65536];
+	rapidjson::FileWriteStream stream(file, writerBuffer, sizeof(writerBuffer));
+	rapidjson::Writer<rapidjson::FileWriteStream> writer(stream);
+	root.Accept(writer);
+}
+
+LevelWrapperObject::LevelWrapperObject(GameWorld* world)
+	: GameObject(KD_LevelWrapper, world) //
+{
+	mStopFreePropagation = true;
+}
+
+LevelWrapperObject::~LevelWrapperObject() {
+	// Destruction/freeing of this object is handled by our parent
+	for (auto child : GetChildren()) {
+		FreeRecursive(child);
+	}
+}
+
+void LevelWrapperObject::SetBoundLevel(Level* level) {
+	if (mLevel != level) {
+		mLevel.Attach(level);
+
+		// Cleanup old children
+		// TODO needs to Resleep()?
+		auto children = RemoveAllChildren();
+		for (auto child : children) {
+			FreeRecursive(child);
+		}
+	}
+
+	level->Instanciate(this);
+
+	PodVector<GameObject*> stack;
+	stack.push_back(this);
+
+	while (!stack.empty()) {
+		auto obj = stack.back();
+		stack.pop_back();
+
+		for (auto child : obj->GetChildren()) {
+			stack.push_back(child);
+		}
+
+		obj->Awaken();
+	}
+}