From 8bf6c66327a081ea2d09362a047a31a3a1665550 Mon Sep 17 00:00:00 2001
From: Zach Pomerantz <zach@highfidelity.io>
Date: Wed, 27 Jan 2016 16:09:16 -0800
Subject: [PATCH] Add (de)serializer for QObject->JSON

---
 interface/src/Application.cpp               |  2 +
 libraries/shared/src/shared/JSONHelpers.cpp | 72 +++++++++++++++++++--
 libraries/shared/src/shared/JSONHelpers.h   | 10 +--
 3 files changed, 76 insertions(+), 8 deletions(-)

diff --git a/interface/src/Application.cpp b/interface/src/Application.cpp
index bf145d0e29..34486ca732 100644
--- a/interface/src/Application.cpp
+++ b/interface/src/Application.cpp
@@ -57,6 +57,8 @@
 #include <gl/Config.h>
 #include <gl/QOpenGLContextWrapper.h>
 
+#include <shared/JSONHelpers.h>
+
 #include <ResourceScriptingInterface.h>
 #include <AccountManager.h>
 #include <AddressManager.h>
diff --git a/libraries/shared/src/shared/JSONHelpers.cpp b/libraries/shared/src/shared/JSONHelpers.cpp
index 19d76ec132..3aab117370 100644
--- a/libraries/shared/src/shared/JSONHelpers.cpp
+++ b/libraries/shared/src/shared/JSONHelpers.cpp
@@ -12,12 +12,12 @@
 #include <QtCore/QJsonObject>
 #include <QtCore/QJsonArray>
 
+#include <QtCore/qmetaobject.h>
+
+#include "../RegisteredMetaTypes.h"
+
 template <typename T> 
 QJsonValue glmToJson(const T& t) {
-    static const T DEFAULT_VALUE = T();
-    if (t == DEFAULT_VALUE) {
-        return QJsonValue();
-    }
     QJsonArray result;
     for (auto i = 0; i < t.length(); ++i) {
         result.push_back(t[i]);
@@ -46,6 +46,10 @@ QJsonValue toJsonValue(const vec3& v) {
     return glmToJson(v);
 }
 
+QJsonValue toJsonValue(const vec4& v) {
+    return glmToJson(v);
+}
+
 quat quatFromJsonValue(const QJsonValue& q) {
     return glmFromJson<quat>(q);
 }
@@ -57,3 +61,63 @@ vec3 vec3FromJsonValue(const QJsonValue& v) {
     return glmFromJson<vec3>(v);
 }
 
+vec4 vec4FromJsonValue(const QJsonValue& v) {
+    if (v.isDouble()) {
+        return vec4((float)v.toDouble());
+    }
+    return glmFromJson<vec4>(v);
+}
+
+QJsonValue toJsonValue(const QObject& o) {
+    QJsonObject json{};
+
+    // Add all properties, see http://doc.qt.io/qt-5/qmetaobject.html#propertyCount
+    const auto& meta = o.metaObject();
+    for (int i = meta->propertyOffset(); i < meta->propertyCount(); ++i) {
+        QString name = QString::fromLatin1(meta->property(i).name());
+        auto type = meta->property(i).userType();
+        QVariant variant{ meta->property(i).read(&o) };
+        QJsonValue value;
+
+        // User-registered types need explicit conversion
+        if (type == qMetaTypeId<quat>()) {
+            value = toJsonValue(variant.value<quat>());
+        } else if (type == qMetaTypeId<vec3>()) {
+            value = toJsonValue(variant.value<vec3>());
+        } else if (type == qMetaTypeId<vec4>()) {
+            value = toJsonValue(variant.value<vec4>());
+        } else {
+            // Qt types are converted automatically
+            value = QJsonValue::fromVariant(variant);
+        }
+
+        json.insert(name, value);
+    }
+
+    // Add all children (recursively)
+    const auto children = o.children();
+    for (const auto& child : children) {
+        QJsonObject childJson = toJsonValue(*child).toObject();
+        if (!childJson.empty()) {
+            json.insert(child->objectName(), childJson);
+        }
+    }
+
+    return json;
+}
+
+void qObjectFromJsonValue(const QJsonValue& j, QObject& o) {
+    const QJsonObject object = j.toObject();
+    for (auto it = object.begin(); it != object.end(); it++) {
+        std::string key = it.key().toStdString();
+        if (it.value().isObject()) {
+            QVariant child = o.property(key.c_str());
+            if (child.isValid()) {
+                QObject* object = child.value<QObject*>();
+                qObjectFromJsonValue(it.value(), *object);
+            }
+        } else {
+            o.setProperty(key.c_str(), it.value());
+        }
+    }
+}
diff --git a/libraries/shared/src/shared/JSONHelpers.h b/libraries/shared/src/shared/JSONHelpers.h
index 0eda8ac94a..735d33b5a5 100644
--- a/libraries/shared/src/shared/JSONHelpers.h
+++ b/libraries/shared/src/shared/JSONHelpers.h
@@ -13,11 +13,13 @@
 #include "../GLMHelpers.h"
 
 QJsonValue toJsonValue(const quat& q);
-
-QJsonValue toJsonValue(const vec3& q);
+QJsonValue toJsonValue(const vec3& v);
+QJsonValue toJsonValue(const vec4& v);
+QJsonValue toJsonValue(const QObject& o);
 
 quat quatFromJsonValue(const QJsonValue& q);
-
-vec3 vec3FromJsonValue(const QJsonValue& q);
+vec3 vec3FromJsonValue(const QJsonValue& v);
+vec4 vec4FromJsonValue(const QJsonValue& v);
+void qObjectFromJsonValue(const QJsonValue& j, QObject& o);
 
 #endif