ResearchTree: add basic functionality and some nodes.

Might be useful for warnings and non-fatal errors, to replace standard
SDL message boxes.

.gitmodules

@@ -26,3 +26,11 @@
 	path = third-party/efsw
 	url = https://github.com/SpartanJ/efsw
 	branch = master
+[submodule "third-party/cpr"]
+	path = third-party/cpr
+	url = https://github.com/whoshuu/cpr
+	branch = master
+[submodule "json.hpp"]
+	path = third-party/json
+	url = https://github.com/nlohmann/json
+	branch = master

CMakeLists.txt

@@ -88,4 +88,11 @@ set(BUILD_TEST_APP OFF CACHE BOOL "" FORCE)
 set(EFSW_INSTALL OFF CACHE BOOL "" FORCE)
 add_subdirectory(third-party/efsw EXCLUDE_FROM_ALL)
 
+set(CPR_BUILD_TESTS OFF CACHE BOOL "" FORCE)
+set(CMAKE_USE_LIBSSH2 OFF CACHE BOOL "" FORCE) # For some reason, even when HTTP_ONLY is set to ON, libcurl will try to link to libssh2.
+add_subdirectory(third-party/cpr EXCLUDE_FROM_ALL)
+
+set(JSON_BuildTests OFF CACHE BOOL "" FORCE)
+add_subdirectory(third-party/json)
+
 add_subdirectory(src)

src/CMakeLists.txt

@@ -18,7 +18,7 @@ set(CMAKE_CXX_STANDARD 14)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_CXX_EXTENSIONS OFF)
 
-set(SAVETOOL_PROJECT_VERSION 1.0.0)
+set(SAVETOOL_PROJECT_VERSION 1.1.0)
 
 find_package(Corrade REQUIRED Main Containers Utility Interconnect)
 find_package(Magnum REQUIRED GL Sdl2Application)
@@ -46,6 +46,11 @@ add_executable(MassBuilderSaveTool WIN32
     Mass/Mass.cpp
     Maps/LastMissionId.h
     Maps/StoryProgress.h
+    ToastQueue/ToastQueue.h
+    ToastQueue/ToastQueue.cpp
+    ResearchTree/NodeIDs.h
+    ResearchTree/ResearchTree.h
+    ResearchTree/ResearchTree.cpp
     FontAwesome/IconsFontAwesome5.h
     FontAwesome/IconsFontAwesome5Brands.h
     resource.rc
@@ -55,7 +60,7 @@ if(CMAKE_BUILD_TYPE STREQUAL Debug)
     add_compile_definitions(SAVETOOL_DEBUG_BUILD)
 endif()
 add_compile_definitions(SAVETOOL_VERSION="${SAVETOOL_PROJECT_VERSION}"
-                        SAVETOOL_CODENAME="Agonising Quark"
+                        SAVETOOL_CODENAME="Beautiful Reina"
                         SUPPORTED_GAME_VERSION="0.7.6")
 
 if(CMAKE_BUILD_TYPE STREQUAL Release)
@@ -75,5 +80,7 @@ target_link_libraries(MassBuilderSaveTool PRIVATE
     MagnumIntegration::ImGui
     efsw
     zip
+    cpr::cpr
+    nlohmann_json::nlohmann_json
     imm32
     wtsapi32)

src/Profile/Profile.cpp

@@ -109,6 +109,8 @@ void Profile::refreshValues() {
     getMuscularConstruction();
     getMineralExoskeletology();
     getCarbonizedSkin();
+
+    getEngineUnlocks();
 }
 
 auto Profile::companyName() const -> std::string const& {
@@ -1001,3 +1003,54 @@ auto Profile::setCarbonizedSkin(Int amount) -> bool {
         return false;
     }
 }
+
+auto Profile::engineInventory() -> Containers::ArrayView<Int> {
+    return _engineInventory;
+}
+
+auto Profile::gearInventory() -> Containers::ArrayView<Int> {
+    return _gearInventory;
+}
+
+void Profile::getEngineUnlocks() {
+    auto mmap = Utility::Directory::map(Utility::Directory::join(_profileDirectory, _filename));
+
+    auto iter = std::search(mmap.begin(), mmap.end(), &engine_inventory_locator[0], &engine_inventory_locator[33]);
+
+    if(iter != mmap.end()) {
+        Int* int_iter = reinterpret_cast<Int*>(iter + 0x3B);
+        Int size = *(int_iter++);
+
+        if(size > 0) {
+            _engineInventory = Containers::Array<Int>{DefaultInit, std::size_t(size)};
+            std::copy_n(int_iter, size, _engineInventory.data());
+
+            Utility::Debug{} << "_engineInventory:" << _engineInventory;
+
+            iter = std::search(mmap.begin(), mmap.end(), &gear_inventory_locator[0], &gear_inventory_locator[31]);
+
+            if(iter == mmap.end()) {
+                return;
+            }
+
+            int_iter = reinterpret_cast<Int*>(iter + 0x39);
+            size = *(int_iter++);
+
+            if(size <= 0) {
+                return;
+            }
+
+            _gearInventory = Containers::Array<Int>{DefaultInit, std::size_t(size)};
+            std::copy_n(int_iter, size, _gearInventory.data());
+
+            Utility::Debug{} << "_gearInventory:" << _gearInventory;
+        }
+        else {
+            _lastError = "An array can't have a null or negative size.";
+            Utility::Fatal{EXIT_FAILURE} << _lastError.c_str();
+        }
+    }
+    else {
+        _lastError = "The profile save seems to be corrupted or the game didn't release the handle on the file.";
+    }
+}

src/Profile/Profile.h

@@ -18,6 +18,8 @@
 
 #include <string>
 
+#include <Corrade/Containers/Array.h>
+
 #include <Magnum/Magnum.h>
 
 using namespace Magnum;
@@ -141,6 +143,10 @@ class Profile {
         auto getCarbonizedSkin() -> Int;
         auto setCarbonizedSkin(Int amount) -> bool;
 
+        auto engineInventory() -> Containers::ArrayView<Int>;
+        auto gearInventory() -> Containers::ArrayView<Int>;
+        void getEngineUnlocks();
+
     private:
         std::string _profileDirectory;
         std::string _filename;
@@ -183,4 +189,13 @@ class Profile {
         Int _muscularConstruction;
         Int _mineralExoskeletology;
         Int _carbonizedSkin;
+
+        Containers::Array<Int> _engineInventory;
+        Containers::Array<Int> _gearInventory;
+
+        Containers::Array<Int> _osInventory;
+        Containers::Array<Int> _moduleInventory;
+
+        Containers::Array<Int> _archInventory;
+        Containers::Array<Int> _techInventory;
 };

src/ResearchTree/NodeIDs.h

@@ -0,0 +1,94 @@
+#pragma once
+
+// MassBuilderSaveTool
+// Copyright (C) 2021 Guillaume Jacquemin
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+enum EngineIDs: Int {
+    // Tier 1
+    VerseEngine           = 100000,
+    LoadedEngine          = 100020,
+    MetalPlatings1        = 200000,
+    HeatTurbines1         = 200040,
+    Microcontroller1      = 200060,
+    CombustionController1 = 200020,
+
+    // Tier 2
+    ModAlloyEngine         = 110000,
+    ChargedEngine          = 110040,
+    ReinforcedLoadedEngine = 110020,
+    HeavyImpactsEnabler    = 110100,
+    MetalPlatings2         = 210000,
+    HeatTurbines2          = 210040,
+    Microcontroller2       = 210060,
+    WeaponsCargo1          = 210061,
+    CombustionController2  = 210020,
+    PoweredRewiring1       = 210021,
+
+    // Tier 3
+    ModSteelEngine,
+    SuperchargedEngine,
+    NecriumAlloyEngine,
+    MetalPlatings3,
+    HeatTurbines3,
+    Microcontroller3,
+    WeaponsCargo2,
+    CombustionController3,
+    PoweredRewiring2,
+
+    // Tier 4
+    ModLunariteEngine,
+    ChargedLunariteEngine,
+    LunariteEngine,
+    InfusedEngine,
+    MetalPlatings4,
+    HeatTurbines4,
+    Microcontroller4,
+    WeaponsCargo3,
+    CombustionController4,
+    PoweredRewiring3,
+    ArmouredCargo1,
+    ArmouredFuelTank1,
+    ExtraCapacity1,
+    HighmetalEngine,
+    PowerRedirector1,
+
+    // Tier 5
+    AsteriteCarbonEngine,
+    ChargedAsteriteEngine,
+    AsteriteSteelEngine,
+    MeldedEngine,
+    MetalPlatings5,
+    HeatTurbines5,
+    Microcontroller5,
+    WeaponsCargo4,
+    CombustionController5,
+    PoweredRewiring4,
+    ArmouredCargo2,
+    ArmouredFuelTank2,
+    ExtraCapacity2,
+    CastHighmetalEngine,
+    PowerRedirector2,
+};
+
+enum OSIDs: Int {
+    // Tier 1
+    NeuralOS = 300010,
+};
+
+enum ArchIDs: Int {
+    // Tier 1
+    StandardFrame = 500099,
+};

src/ResearchTree/ResearchTree.cpp

@@ -0,0 +1,277 @@
+// MassBuilderSaveTool
+// Copyright (C) 2021 Guillaume Jacquemin
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+#include "ResearchTree.h"
+
+#include "NodeIDs.h"
+
+//region Node
+Node::Node(Node::Type type, const char* name, UnsignedByte tier, UnsignedByte slots,
+           const char* description, const char* active_effect, const char* passive_effect):
+    _type{type}, _state{State::Unavailable}, _name{name}, _tier{tier}, _slots{slots},
+    _description{description}, _activeEffect{active_effect}, _passiveEffect{passive_effect}
+{
+    //ctor
+}
+
+auto Node::type() const -> Node::Type {
+    return _type;
+}
+
+auto Node::state() const -> Node::State {
+    return _state;
+}
+
+void Node::setState(Node::State state) {
+    if(_state == state) {
+        return;
+    }
+
+    _state = state;
+
+    if(_state == State::Available) {
+        for(Node* n : _children) {
+            n->setState(State::Unavailable, NotClicked);
+        }
+    }
+    else if(_state == State::Unlocked) {
+        for(Node* n : _children) {
+            n->setState(State::Available, NotClicked);
+        }
+    }
+}
+
+auto Node::name() const -> const char* {
+    return _name;
+}
+
+auto Node::tier() const -> UnsignedByte {
+    return _tier;
+}
+
+auto Node::slots() const -> UnsignedByte {
+    return _slots;
+}
+
+auto Node::description() const -> const char* {
+    return _description;
+}
+
+auto Node::activeEffect() const -> const char* {
+    return _activeEffect;
+}
+
+auto Node::passiveEffect() const -> const char* {
+    return _passiveEffect;
+}
+
+auto Node::children() -> Containers::ArrayView<Node*> {
+    return _children;
+}
+
+void Node::addChild(Node& child) {
+    arrayAppend(_children, &child);
+    child.addParent(*this);
+}
+
+void Node::addParent(Node& parent) {
+    arrayAppend(_parents, &parent);
+}
+
+void Node::setState(State state, NotClickedT) {
+    if(_state == state) {
+        return;
+    }
+
+    if(state == State::Unavailable) {
+        for(Node* node : _parents) {
+            if(node->state() == State::Unlocked) {
+                return;
+            }
+        }
+    }
+    else if(state == State::Available && _state == State::Unlocked) {
+        return;
+    }
+
+    _state = state;
+
+    if(_state != State::Unlocked) {
+        for(Node* node : _children) {
+            node->setState(State::Unavailable, NotClicked);
+        }
+    }
+    else {
+        for(Node* node : _children) {
+            node->setState(State::Available, NotClicked);
+        }
+    }
+}
+//endregion
+
+void ResearchTree::generateEngineTree() {
+    if(!_engineNodes.empty()) {
+        return;
+    }
+
+    _engineNodes.emplace(VerseEngine, Node{Node::Type::Engine, "Verse Engine", 1, 3,
+                                           "A basic low-speed engine with great durability.",
+                                           "Durability +346, Power +60, Armour +22, Acceleration +75, Magazine load +35, Energy capacity +35",
+                                           "Durability +3%"});
+
+    _engineNodes.emplace(LoadedEngine, Node{Node::Type::Engine, "Loaded Engine", 1, 3,
+                                            "An alternate heavier model of engine used to operate a M.A.S.S.",
+                                            "Durability +288, Power +84, Armour +14, Acceleration +75, Magazine load +35, Energy capacity +35",
+                                            "Power +3%"});
+
+    _engineNodes.emplace(MetalPlatings1, Node{Node::Type::Gear, "Metal Platings 1", 1, 0,
+                                              "Level 1 metal plating that adds durability and armour to your engine.",
+                                              "Durability +60, Armour +5, Acceleration -15", ""});
+
+    _engineNodes.emplace(HeatTurbines1, Node{Node::Type::Gear, "Heat Turbines 1", 1, 0,
+                                             "Modified heat turbines to increase speed for a M.A.S.S.",
+                                             "Acceleration +75, Fuel capacity +5", ""});
+
+    _engineNodes.emplace(Microcontroller1, Node{Node::Type::Gear, "Microcontroller 1", 1, 0,
+                                                "A microchip that enhances various aspects of a M.A.S.S.",
+                                                "Durability +36, Power +1, Armour +11, Magazine load +5, Energy capacity +5, Fuel capacity +3", ""});
+
+    _engineNodes.emplace(CombustionController1, Node{Node::Type::Gear, "Combustion Controller 1", 1, 0,
+                                                     "Controlled combustion allows increased power generation through specific ignition.",
+                                                     "Power +2, Magazine load +10, Energy capacity +10, Acceleration -25", ""});
+
+    _engineNodes.emplace(ModAlloyEngine, Node{Node::Type::Engine, "Mod. Alloy Engine", 2, 3,
+                                              "Built with a modified alloy and able to sustain greater attacks from any enemy.",
+                                              "Durability +1152, Power +75, Armour +194, Acceleration +75, Magazine load +40, Energy capacity +40",
+                                              "Durability +3%"});
+
+    _engineNodes.emplace(ChargedEngine, Node{Node::Type::Engine, "Charged Engine", 2, 3,
+                                             "Remove most armours to attain more speed and power, and fuel.",
+                                             "Durability +960, Power +75, Acceleration +300, Magazine load +40, Energy capacity +40, Fuel capacity +52",
+                                             "Acceleration +5"});
+
+    _engineNodes.emplace(ReinforcedLoadedEngine, Node{Node::Type::Engine, "Reinforced Loaded Engine", 2, 3,
+                                                      "An upgraded build of the basic model, with reinforced Verse Steel for more strength.",
+                                                      "Durability +960, Power +105, Armour +130, Acceleration +75, Magazine load +40, Energy capacity +40",
+                                                      "Power +3%"});
+
+    _engineNodes.emplace(HeavyImpactsEnabler, Node{Node::Type::Engine, "Heavy Impacts Enabler", 2, 0,
+                                                   "Enable the usage of Heavy Combos in close combat attacks.", "", ""});
+
+    _engineNodes.emplace(MetalPlatings2, Node{Node::Type::Gear, "Metal Platings 2", 2, 0,
+                                              "Level 2 Metal plating that adds durability and armour to your engine.",
+                                              "Durability +180, Armour +41, Acceleration -15", ""});
+
+    _engineNodes.emplace(HeatTurbines2, Node{Node::Type::Gear, "Heat Turbines 2", 2, 0,
+                                             "Level 2 Modified heat turbines to increase speed for a M.A.S.S.",
+                                             "Acceleration +75, Fuel capacity +16", ""});
+
+    _engineNodes.emplace(Microcontroller2, Node{Node::Type::Gear, "Microcontroller 2", 2, 0,
+                                                "Level 2 Microchip that enhances various aspects of a M.A.S.S.",
+                                                "Durability +108, Power +3, Armour +17, Magazine load +6, Energy capacity +6, Fuel capacity +8", ""});
+
+    _engineNodes.emplace(WeaponsCargo1, Node{Node::Type::Gear, "Weapons Cargo 1", 2, 0,
+                                             "Added another cargo hold for ammo and energy recharger",
+                                             "Magazine load +24, Energy capacity +24, Acceleration -40", ""});
+
+    _engineNodes.emplace(CombustionController2, Node{Node::Type::Gear, "Combustion Controller 2", 2, 0,
+                                                     "Level 2 Controlled combustion allows increased power generation through specific ignition.",
+                                                     "Power +5, Magazine load +12, Energy capacity +12, Acceleration -25", ""});
+
+    _engineNodes.emplace(PoweredRewiring1, Node{Node::Type::Gear, "Powered Rewiring 1", 2, 0,
+                                                     "Rewiring that efficiently improves power and engine durability.",
+                                                     "Durability +180, Power +5", ""});
+
+    _engineNodes.at(VerseEngine).addChild(_engineNodes.at(MetalPlatings1));
+    _engineNodes.at(VerseEngine).addChild(_engineNodes.at(HeatTurbines1));
+    _engineNodes.at(VerseEngine).addChild(_engineNodes.at(LoadedEngine));
+    _engineNodes.at(LoadedEngine).addChild(_engineNodes.at(Microcontroller1));
+    _engineNodes.at(LoadedEngine).addChild(_engineNodes.at(CombustionController1));
+    _engineNodes.at(MetalPlatings1).addChild(_engineNodes.at(ModAlloyEngine));
+    _engineNodes.at(HeatTurbines1).addChild(_engineNodes.at(ChargedEngine));
+    _engineNodes.at(Microcontroller1).addChild(_engineNodes.at(ChargedEngine));
+    _engineNodes.at(CombustionController1).addChild(_engineNodes.at(ReinforcedLoadedEngine));
+    _engineNodes.at(ModAlloyEngine).addChild(_engineNodes.at(MetalPlatings2));
+    _engineNodes.at(ModAlloyEngine).addChild(_engineNodes.at(HeatTurbines2));
+    _engineNodes.at(ChargedEngine).addChild(_engineNodes.at(HeatTurbines2));
+    _engineNodes.at(ChargedEngine).addChild(_engineNodes.at(Microcontroller2));
+    _engineNodes.at(ChargedEngine).addChild(_engineNodes.at(WeaponsCargo1));
+    _engineNodes.at(ReinforcedLoadedEngine).addChild(_engineNodes.at(CombustionController2));
+    _engineNodes.at(ReinforcedLoadedEngine).addChild(_engineNodes.at(PoweredRewiring1));
+    _engineNodes.at(ReinforcedLoadedEngine).addChild(_engineNodes.at(HeavyImpactsEnabler));
+
+    _engineNodes.at(VerseEngine).setState(Node::State::Unlocked);
+}
+
+void ResearchTree::generateOSTree() {
+    if(!_osNodes.empty()) {
+        return;
+    }
+
+    _osNodes.emplace(NeuralOS, Node{Node::Type::OS, "Neural OS", 1, 3,
+                                    "Synchronise the links between your nervous system and the M.A.S.S. perfectly.",
+                                    "Accuracy +24, Shield +624, Fuel burn rate +200, Magazine reload +24, Energy recharge +66, Shield recover +1620",
+                                    "Shield +3%"});
+
+    _osNodes.at(NeuralOS).setState(Node::State::Unlocked);
+}
+
+void ResearchTree::generateArchTree() {
+    if(!_archNodes.empty()) {
+        return;
+    }
+
+    _archNodes.emplace(StandardFrame, Node{Node::Type::Architect, "Standard Frame", 1, 2,
+                                           "The standard frame architecture for mass-produced humanoid robots. It uses the most common technologies and materials.",
+                                           "Durability +300, Shield +200, Physical damage +600, Piercing damage +300, Plasma damage +300",
+                                           ""});
+
+    _archNodes.at(StandardFrame).setState(Node::State::Unlocked);
+}
+
+void ResearchTree::readEngineUnlocks(Containers::ArrayView<Int> engines, Containers::ArrayView<Int> gears) {
+    if(engines == nullptr || engines.size() == 0) {
+        Utility::Error{} << "Engines can't be empty";
+    }
+
+    for(Int& engine : engines) {
+        if(_engineNodes.find(engine) != _engineNodes.end()) {
+            _engineNodes.at(engine).setState(Node::State::Unlocked);
+        }
+    }
+
+    if(gears == nullptr || engines.size() == 0) {
+        return;
+    }
+
+    for(Int& gear : gears) {
+        if(_engineNodes.find(gear) != _engineNodes.end()) {
+            _engineNodes.at(gear).setState(Node::State::Unlocked);
+        }
+    }
+}
+
+auto ResearchTree::getEngineRootNode() -> Node& {
+    return _engineNodes.at(VerseEngine);
+}
+
+auto ResearchTree::getOSRootNode() -> Node& {
+    return _osNodes.at(NeuralOS);
+}
+
+auto ResearchTree::getArchRootNode() -> Node& {
+    return _archNodes.at(StandardFrame);
+}

src/ResearchTree/ResearchTree.h

@@ -0,0 +1,112 @@
+#pragma once
+
+// MassBuilderSaveTool
+// Copyright (C) 2021 Guillaume Jacquemin
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+#include <unordered_map>
+
+#include <Corrade/Containers/ArrayView.h>
+#include <Corrade/Containers/GrowableArray.h>
+
+#include <Magnum/Magnum.h>
+
+using namespace Corrade;
+using namespace Magnum;
+
+class Node {
+    public:
+        enum class Type {
+            Engine,
+            Gear,
+            OS,
+            Module,
+            Architect,
+            Tech
+        };
+
+        enum class State {
+            Unavailable,
+            Available,
+            Unlocked
+        };
+
+        Node(Type type, const char* name, UnsignedByte tier, UnsignedByte slots,
+             const char* description, const char* active_effect, const char* passive_effect);
+
+        Node(const Node& other) = delete;
+        Node& operator=(const Node& other) = delete;
+
+        Node(Node&& other) = default;
+        Node& operator=(Node&& other) = default;
+
+        auto type() const -> Type;
+
+        auto state() const -> State;
+        void setState(State state);
+
+        auto name() const -> const char*;
+
+        auto tier() const -> UnsignedByte;
+
+        auto slots() const -> UnsignedByte;
+
+        auto description() const -> const char*;
+
+        auto activeEffect() const -> const char*;
+
+        auto passiveEffect() const -> const char*;
+
+        auto children() -> Containers::ArrayView<Node*>;
+        void addChild(Node& child);
+
+    private:
+        void addParent(Node& parent);
+
+        struct NotClickedT {} NotClicked;
+        void setState(State state, NotClickedT);
+
+        Type _type;
+        State _state;
+
+        const char* _name;
+        UnsignedByte _tier;
+        UnsignedByte _slots;
+        const char* _description;
+        const char* _activeEffect;
+        const char* _passiveEffect;
+
+        Containers::Array<Node*> _parents;
+        Containers::Array<Node*> _children;
+};
+
+class ResearchTree {
+    public:
+        void generateEngineTree();
+        void generateOSTree();
+        void generateArchTree();
+
+        void readEngineUnlocks(Containers::ArrayView<Int> engines, Containers::ArrayView<Int> gears = nullptr);
+
+        auto getEngineRootNode() -> Node&;
+        auto getOSRootNode() -> Node&;
+        auto getArchRootNode() -> Node&;
+
+    private:
+        using Tree = std::unordered_map<Int, Node>;
+        Tree _engineNodes;
+        Tree _osNodes;
+        Tree _archNodes;
+};

src/SaveTool/SaveTool.cpp

@@ -30,6 +30,10 @@
 #include <Magnum/ImGuiIntegration/Integration.h>
 #include <Magnum/ImGuiIntegration/Context.hpp>
 
+#include <cpr/cpr.h>
+
+#include <nlohmann/json.hpp>
+
 #include <windef.h>
 #include <winuser.h>
 #include <processthreadsapi.h>
@@ -81,12 +85,15 @@ SaveTool::SaveTool(const Arguments& arguments):
 
     initialiseGui();
 
-    if((_initEventId = SDL_RegisterEvents(1)) == UnsignedInt(-1)) {
+    if((_initEventId = SDL_RegisterEvents(2)) == UnsignedInt(-1)) {
         SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "Error",
                                  "SDL_RegisterEvents failed in SaveTool::SaveTool(). Exiting...", window());
         exit(EXIT_FAILURE);
+        return;
     }
 
+    _updateEventId = _initEventId + 1;
+
     _backupsDir = Utility::Directory::join(Utility::Directory::path(Utility::Directory::executableLocation()), "backups");
     _stagingDir = Utility::Directory::join(Utility::Directory::path(Utility::Directory::executableLocation()), "staging");
 
@@ -101,6 +108,7 @@ SaveTool::SaveTool(const Arguments& arguments):
     if(!findGameDataDirectory()) {
         SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "Error initialising the app", _lastError.c_str(), window());
         exit(EXIT_FAILURE);
+        return;
     }
 
     _configDir = Utility::Directory::join(_gameDataDir, "Saved/Config/WindowsNoEditor");
@@ -110,6 +118,7 @@ SaveTool::SaveTool(const Arguments& arguments):
     if(SDL_InitSubSystem(SDL_INIT_TIMER) != 0) {
         SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "Error initialising the app", SDL_GetError(), window());
         exit(EXIT_FAILURE);
+        return;
     }
 
     checkGameState();
@@ -122,11 +131,24 @@ SaveTool::SaveTool(const Arguments& arguments):
     if(_gameCheckTimerId == 0) {
         SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "Error", SDL_GetError(), window());
         exit(EXIT_FAILURE);
+        return;
+    }
+
+    initialiseConfiguration();
+
+    if(_checkUpdatesOnStartup) {
+        _thread = std::thread{[this]{ checkForUpdates(); }};
+        _queue.addToast(Toast::Type::Default, "Checking for updates...");
     }
 }
 
 SaveTool::~SaveTool() {
     SDL_RemoveTimer(_gameCheckTimerId);
+
+    _conf.setValue("cheat_mode", _cheatMode);
+    _conf.setValue("unsafe_mode", _unsafeMode);
+    _conf.setValue("startup_update_check", _checkUpdatesOnStartup);
+    _conf.save();
 }
 
 void SaveTool::handleFileAction(efsw::WatchID watch_id,
@@ -166,6 +188,9 @@ void SaveTool::handleFileAction(efsw::WatchID watch_id,
         case efsw::Actions::Modified:
             if(filename == _currentProfile->filename()) {
                 _currentProfile->refreshValues();
+                if(_tree) {
+                    _tree->readEngineUnlocks(_currentProfile->engineInventory(), _currentProfile->gearInventory());
+                }
             }
             else if(Utility::String::endsWith(filename, _currentProfile->steamId() + ".sav")) {
                 if(Utility::String::beginsWith(filename, Utility::formatString("{}Unit", _currentProfile->type() == ProfileType::Demo ? "Demo" : ""))) {
@@ -247,6 +272,9 @@ void SaveTool::anyEvent(SDL_Event& event) {
     if(event.type == _initEventId) {
         initEvent(event);
     }
+    else if(event.type == _updateEventId) {
+        updateCheckEvent(event);
+    }
 }
 
 void SaveTool::initEvent(SDL_Event& event) {
@@ -266,6 +294,97 @@ void SaveTool::initEvent(SDL_Event& event) {
     }
 }
 
+void SaveTool::updateCheckEvent(SDL_Event& event) {
+    _thread.join();
+
+    cpr::Response r{std::move(*static_cast<cpr::Response*>(event.user.data1))};
+    delete static_cast<cpr::Response*>(event.user.data1);
+
+    if(r.elapsed > 10.0) {
+        _queue.addToast(Toast::Type::Error, "The request timed out.");
+        return;
+    }
+
+    if(r.status_code != 200) {
+        _queue.addToast(Toast::Type::Error, Utility::formatString("The request failed with error code {}: {}", r.status_code, r.reason));
+        return;
+    }
+
+    using json = nlohmann::json;
+
+    json response = json::parse(r.text);
+
+    struct Version {
+        explicit Version(const std::string& str) {
+            std::size_t start_point = 0;
+
+            if(str[0] == 'v') {
+                start_point++;
+            }
+
+            major = std::atoi(str.c_str() + start_point);
+            start_point = str.find('.', start_point) + 1;
+            minor = std::atoi(str.c_str() + start_point);
+            start_point = str.find('.', start_point) + 1;
+            patch = std::atoi(str.c_str() + start_point);
+        }
+        Int major;
+        Int minor;
+        Int patch;
+
+        bool operator==(const Version& other) const {
+            return (major == other.major) && (minor == other.minor) && (patch == other.patch);
+        }
+        bool operator>(const Version& other) const {
+            return (      major * 10000 +       minor * 100 +       patch) >
+                   (other.major * 10000 + other.minor * 100 + other.patch);
+        }
+    };
+
+    static const Version current_ver{SAVETOOL_VERSION};
+    Version latest_ver{response[0]["tag_name"]};
+
+    if(latest_ver == current_ver) {
+        _queue.addToast(Toast::Type::Success, "The application is already up to date.");
+    }
+    else if(latest_ver > current_ver) {
+        _queue.addToast(Toast::Type::Warning, "Your version is out of date.\nCheck the settings for more information.",
+                        std::chrono::milliseconds{5000});
+        _updateAvailable = true;
+        _latestVersion = Utility::formatString("{}.{}.{}", latest_ver.major, latest_ver.minor, latest_ver.patch);
+        _releaseLink = response[0]["html_url"];
+        _downloadLink = response[0]["assets"][0]["browser_download_url"];
+    }
+    else if(current_ver > latest_ver) {
+        _queue.addToast(Toast::Type::Warning, "Your version is more recent than the latest one in the repo. How???");
+    }
+}
+
+void SaveTool::initialiseConfiguration() {
+    if(_conf.hasValue("cheat_mode")) {
+        _cheatMode = _conf.value<bool>("cheat_mode");
+    }
+    else {
+        _conf.setValue("cheat_mode", _cheatMode);
+    }
+
+    if(_conf.hasValue("unsafe_mode")) {
+        _unsafeMode = _conf.value<bool>("unsafe_mode");
+    }
+    else {
+        _conf.setValue("unsafe_mode", _unsafeMode);
+    }
+
+    if(_conf.hasValue("startup_update_check")) {
+        _checkUpdatesOnStartup = _conf.value<bool>("startup_update_check");
+    }
+    else {
+        _conf.setValue("startup_update_check", _checkUpdatesOnStartup);
+    }
+
+    _conf.save();
+}
+
 void SaveTool::initialiseGui() {
     ImGui::CreateContext();
 
@@ -415,13 +534,15 @@ void SaveTool::drawGui() {
         ImGui::ShowMetricsWindow(&_metricsWindow);
     }
 #endif
+
+    _queue.draw(windowSize());
 }
 
 void SaveTool::drawDisclaimer() {
     ImGui::SetNextWindowPos(ImVec2{Vector2{windowSize() / 2.0f}}, ImGuiCond_Always, center_pivot);
 
     if(ImGui::Begin("Disclaimer##DisclaimerWindow", nullptr,
-                    ImGuiWindowFlags_NoCollapse|ImGuiWindowFlags_NoMove|
+                    ImGuiWindowFlags_NoCollapse|ImGuiWindowFlags_NoMove|ImGuiWindowFlags_NoBringToFrontOnFocus|
                     ImGuiWindowFlags_NoResize|ImGuiWindowFlags_NoTitleBar|ImGuiWindowFlags_MenuBar))
     {
         if(ImGui::BeginMenuBar()) {
@@ -549,3 +670,15 @@ void SaveTool::checkGameState() {
         _gameState = GameState::Unknown;
     }
 }
+
+void SaveTool::checkForUpdates() {
+    cpr::Response r = cpr::Get(cpr::Url{"https://williamjcm.ovh/git/api/v1/repos/williamjcm/MassBuilderSaveTool/releases"},
+                               cpr::Parameters{{"limit", "1"}}, cpr::Timeout{10000});
+
+    SDL_Event event;
+    SDL_zero(event);
+    event.type = _updateEventId;
+    event.user.code = r.status_code;
+    event.user.data1 = new cpr::Response{std::move(r)};
+    SDL_PushEvent(&event);
+}

src/SaveTool/SaveTool.h

@@ -19,6 +19,7 @@
 #include <thread>
 
 #include <Corrade/Containers/Pointer.h>
+#include <Corrade/Utility/Configuration.h>
 #include <Corrade/Utility/Resource.h>
 
 #include <Magnum/Platform/Sdl2Application.h>
@@ -33,6 +34,10 @@
 
 #include "../ProfileManager/ProfileManager.h"
 #include "../MassManager/MassManager.h"
+#include "../ToastQueue/ToastQueue.h"
+#include "../ResearchTree/ResearchTree.h"
+
+class Node;
 
 using namespace Corrade;
 using namespace Magnum;
@@ -70,8 +75,10 @@ class SaveTool: public Platform::Sdl2Application, public efsw::FileWatchListener
             ProfileManagerFailure
         };
         void initEvent(SDL_Event& event);
+        void updateCheckEvent(SDL_Event& event);
 
         // Initialisation methods
+        void initialiseConfiguration();
         void initialiseGui();
         void initialiseManager();
         auto findGameDataDirectory() -> bool;
@@ -93,6 +100,8 @@ class SaveTool: public Platform::Sdl2Application, public efsw::FileWatchListener
         auto drawRenamePopup(Containers::ArrayView<char> name_view) -> bool;
         void drawGeneralInfo();
         void drawResearchInventory();
+        void drawResearchTree();
+        void drawNode(Node& node);
         void drawMassManager();
         auto drawDeleteMassPopup(int mass_index) -> ImGuiID;
         auto drawDeleteStagedMassPopup(const std::string& filename) -> ImGuiID;
@@ -136,6 +145,9 @@ class SaveTool: public Platform::Sdl2Application, public efsw::FileWatchListener
 
         void checkGameState();
 
+        void checkForUpdates();
+
+        Utility::Configuration _conf{"MassBuilderSaveTool.ini"};
         Utility::Resource _rs{"assets"};
 
         // GUI-related members
@@ -155,8 +167,12 @@ class SaveTool: public Platform::Sdl2Application, public efsw::FileWatchListener
         bool _metricsWindow{false};
 #endif
 
-        std::thread _thread;
+        ToastQueue _queue;
+
+        std::thread _thread; // used for threaded operations such as profile manager init or update checking.
+
         UnsignedInt _initEventId;
+        UnsignedInt _updateEventId;
 
         std::string _lastError;
 
@@ -186,5 +202,15 @@ class SaveTool: public Platform::Sdl2Application, public efsw::FileWatchListener
         };
         Containers::StaticArray<2, efsw::WatchID> _watchIDs;
 
+        Containers::Pointer<ResearchTree> _tree;
+
+        bool _checkUpdatesOnStartup{true};
         bool _unsafeMode{false};
+
+        bool _updateAvailable{false};
+        std::string _latestVersion;
+        std::string _releaseLink;
+        std::string _downloadLink;
+
+        bool _cheatMode{false};
 };

src/SaveTool/SaveTool_MainManager.cpp

@@ -42,12 +42,6 @@ void SaveTool::drawManager() {
         return;
     }
 
-    if(ImGui::BeginTable("##TopRow", 2)) {
-        ImGui::TableSetupColumn("##ProfileInfo", ImGuiTableColumnFlags_WidthStretch);
-        ImGui::TableSetupColumn("##Unsafe", ImGuiTableColumnFlags_WidthFixed);
-
-        ImGui::TableNextRow();
-        ImGui::TableSetColumnIndex(0);
     ImGui::AlignTextToFramePadding();
     ImGui::Text("Current profile: %s (%s)",
                 _currentProfile->companyName().c_str(),
@@ -60,14 +54,6 @@ void SaveTool::drawManager() {
         _uiState = UiState::ProfileManager;
     }
 
-        ImGui::TableSetColumnIndex(1);
-        ImGui::Checkbox("Unsafe mode", &_unsafeMode);
-        drawTooltip("Enabling this allows interactions deemed to be unsafe to do while the game is running.",
-                    Float(windowSize().x()) * 0.35f);
-
-        ImGui::EndTable();
-    }
-
     if(ImGui::BeginChild("##ProfileInfo",
                          {ImGui::GetContentRegionAvailWidth() * 0.60f, 0.0f},
                          true, ImGuiWindowFlags_MenuBar))
@@ -88,6 +74,11 @@ void SaveTool::drawManager() {
                 ImGui::EndTabItem();
             }
 
+            if(ImGui::BeginTabItem("Research tree")) {
+                drawResearchTree();
+                ImGui::EndTabItem();
+            }
+
             ImGui::EndTabBar();
         }
 
@@ -245,6 +236,10 @@ void SaveTool::drawGeneralInfo() {
         }
     }
 
+    if(!_cheatMode) {
+        return;
+    }
+
     ImGui::SameLine();
 
     static Int credits;
@@ -315,7 +310,8 @@ void SaveTool::drawResearchInventory() {
         ImGui::TextUnformatted((name));                                                           \
         ImGui::TableSetColumnIndex(1);                                                            \
         if(_currentProfile->getter() != -1) {                                                     \
-            drawUnsafeText("%i", _currentProfile->getter());                                  \
+            ImGui::Text("%i", _currentProfile->getter());                                         \
+            if(_cheatMode) {                                                                      \
                 ImGui::TableSetColumnIndex(2);                                                    \
                 ImGui::PushID(#setter);                                                           \
                 static Int var = _currentProfile->getter();                                       \
@@ -331,6 +327,7 @@ void SaveTool::drawResearchInventory() {
                 }                                                                                 \
                 ImGui::PopID();                                                                   \
             }                                                                                     \
+        }                                                                                         \
         else {                                                                                    \
             ImGui::TextDisabled("Not found in the save file");                                    \
         }
@@ -397,6 +394,124 @@ void SaveTool::drawResearchInventory() {
     #undef matRow
 }
 
+void SaveTool::drawResearchTree() {
+    if(!_tree) {
+        _tree.emplace();
+
+        _tree->generateEngineTree();
+        _tree->readEngineUnlocks(_currentProfile->engineInventory(), _currentProfile->gearInventory());
+
+        _tree->generateOSTree();
+
+        _tree->generateArchTree();
+    }
+
+    if(ImGui::BeginTabBar("##TreeTabBar")) {
+        if(ImGui::BeginTabItem("Engine")) {
+            if(ImGui::BeginTable("##EngineTable", 1, ImGuiTableFlags_RowBg)) {
+                ImGui::TableSetupColumn("##Column", ImGuiTableColumnFlags_WidthStretch);
+
+                drawNode(_tree->getEngineRootNode());
+
+                ImGui::EndTable();
+            }
+
+            ImGui::EndTabItem();
+        }
+
+        if(ImGui::BeginTabItem("OS")) {
+            if(ImGui::BeginTable("##OSTable", 1, ImGuiTableFlags_RowBg)) {
+                ImGui::TableSetupColumn("##Column", ImGuiTableColumnFlags_WidthStretch);
+
+                drawNode(_tree->getOSRootNode());
+
+                ImGui::EndTable();
+            }
+
+            ImGui::EndTabItem();
+        }
+
+        if(ImGui::BeginTabItem("Architect")) {
+            if(ImGui::BeginTable("##ArchTable", 1, ImGuiTableFlags_RowBg)) {
+                ImGui::TableSetupColumn("##Column", ImGuiTableColumnFlags_WidthStretch);
+
+                drawNode(_tree->getArchRootNode());
+
+                ImGui::EndTable();
+            }
+
+            ImGui::EndTabItem();
+        }
+
+        ImGui::EndTabBar();
+    }
+}
+
+void SaveTool::drawNode(Node& node) {
+    auto nodeTooltip = [this, &node]{
+        if(ImGui::IsItemHovered()) {
+            ImGui::BeginTooltip();
+            ImGui::Text("Tier %u", node.tier());
+
+            if(node.type() == Node::Type::Engine ||
+               node.type() == Node::Type::OS     ||
+               node.type() == Node::Type::Architect)
+            {
+                ImGui::SameLine();
+                ImGui::SeparatorEx(ImGuiSeparatorFlags_Vertical);
+                ImGui::SameLine();
+                switch(node.type()) {
+                    case Node::Type::Engine:
+                        ImGui::Text("%u gear slots", node.slots());
+                        break;
+                    case Node::Type::OS:
+                        ImGui::Text("%u module slots", node.slots());
+                        break;
+                    case Node::Type::Architect:
+                        ImGui::Text("%u tech slots", node.slots());
+                        break;
+                    default:
+                        break;
+                }
+            }
+
+            ImGui::Separator();
+            ImGui::PushTextWrapPos(windowSize().x() * 0.40f);
+            ImGui::TextUnformatted(node.description());
+            if(std::strncmp("", node.activeEffect(), 3) != 0) {
+                ImGui::Separator();
+                ImGui::Text("Active effect: %s", node.activeEffect());
+            }
+            if(std::strncmp("", node.passiveEffect(), 3) != 0) {
+                ImGui::Separator();
+                ImGui::Text("Passive effect: %s", node.passiveEffect());
+            }
+            ImGui::PopTextWrapPos();
+            ImGui::EndTooltip();
+        }
+    };
+
+    ImGui::TableNextRow();
+    ImGui::TableNextColumn();
+
+    bool has_children = (node.children().size() > 0);
+    if(has_children) {
+        bool open = ImGui::TreeNodeEx(node.name(), ImGuiTreeNodeFlags_SpanAvailWidth|(node.state() == Node::State::Unlocked ? ImGuiTreeNodeFlags_Selected : 0));
+        nodeTooltip();
+        if(open) {
+            for(Node* child : node.children()) {
+                drawNode(*child);
+            }
+            ImGui::TreePop();
+        }
+    }
+    else {
+        ImGui::TreeNodeEx(node.name(), ImGuiTreeNodeFlags_SpanAvailWidth|ImGuiTreeNodeFlags_Leaf|ImGuiTreeNodeFlags_NoTreePushOnOpen|
+                                       ImGuiTreeNodeFlags_Bullet|(node.state() == Node::State::Unlocked ? ImGuiTreeNodeFlags_Selected : 0));
+        nodeTooltip();
+    }
+}
+
 void SaveTool::drawMassManager() {
     if(!_massManager) {
         return;

src/SaveTool/SaveTool_ProfileManager.cpp

@@ -27,7 +27,7 @@ void SaveTool::drawProfileManager() {
 
     ImGui::SetNextWindowPos(ImVec2{Vector2{windowSize() / 2.0f}}, ImGuiCond_Always, center_pivot);
     if(ImGui::Begin("Profile management##ProfileManager", nullptr,
-                    ImGuiWindowFlags_NoCollapse|ImGuiWindowFlags_AlwaysAutoResize|
+                    ImGuiWindowFlags_NoCollapse|ImGuiWindowFlags_AlwaysAutoResize|ImGuiWindowFlags_NoBringToFrontOnFocus|
                     ImGuiWindowFlags_NoTitleBar|ImGuiWindowFlags_NoMove|ImGuiWindowFlags_MenuBar))
     {
         if(ImGui::BeginMenuBar()) {

src/SaveTool/SaveTool_drawAbout.cpp

@@ -251,6 +251,58 @@ void SaveTool::drawAbout() {
             ImGui::TreePop();
         }
 
+        if(ImGui::TreeNodeEx("C++ Requests (cpr)", ImGuiTreeNodeFlags_SpanAvailWidth)) {
+            ImGui::AlignTextToFramePadding();
+            const char* cpr_website = "https://whoshuu.github.io/cpr/";
+            ImGui::Text(ICON_FA_GLOBE " %s", cpr_website);
+            ImGui::SameLine();
+            if(ImGui::Button("Copy to clipboard")) {
+                ImGui::SetClipboardText(cpr_website);
+            }
+            ImGui::SameLine();
+            if(ImGui::Button("Open in browser")) {
+                openUri(cpr_website);
+            }
+
+            ImGui::TextUnformatted("Licence: MIT");
+
+            static const auto cpr_licence = _rs.get("LICENSE.cpr");
+            if(ImGui::BeginChild("##cprLicence", {0.0f, windowSize().y() * 0.3f}, true)) {
+                ImGui::PushFont(ImGui::GetIO().Fonts->Fonts[1]);
+                ImGui::TextUnformatted(cpr_licence.c_str());
+                ImGui::PopFont();
+            }
+            ImGui::EndChild();
+
+            ImGui::TreePop();
+        }
+
+        if(ImGui::TreeNodeEx("JSON for Modern C++ (aka json.hpp)", ImGuiTreeNodeFlags_SpanAvailWidth)) {
+            ImGui::AlignTextToFramePadding();
+            const char* json_website = "https://json.nlohmann.me/";
+            ImGui::Text(ICON_FA_GLOBE " %s", json_website);
+            ImGui::SameLine();
+            if(ImGui::Button("Copy to clipboard")) {
+                ImGui::SetClipboardText(json_website);
+            }
+            ImGui::SameLine();
+            if(ImGui::Button("Open in browser")) {
+                openUri(json_website);
+            }
+
+            ImGui::TextUnformatted("Licence: MIT");
+
+            static const auto json_licence = _rs.get("LICENSE.json");
+            if(ImGui::BeginChild("##jsonLicence", {0.0f, windowSize().y() * 0.3f}, true)) {
+                ImGui::PushFont(ImGui::GetIO().Fonts->Fonts[1]);
+                ImGui::TextUnformatted(json_licence.c_str());
+                ImGui::PopFont();
+            }
+            ImGui::EndChild();
+
+            ImGui::TreePop();
+        }
+
         if(ImGui::TreeNodeEx("Font Awesome", ImGuiTreeNodeFlags_SpanAvailWidth)) {
             ImGui::TextUnformatted("Version used: 5.15.3");
             ImGui::AlignTextToFramePadding();

src/SaveTool/SaveTool_drawMainMenu.cpp

@@ -41,11 +41,11 @@ void SaveTool::drawMainMenu() {
             }
 
             if(ImGui::BeginMenu(ICON_FA_FOLDER_OPEN " Open manager directory")) {
-                if(ImGui::MenuItem(ICON_FA_FILE_ARCHIVE " Profile backups", nullptr, false, _profileManager != nullptr)) {
+                if(ImGui::MenuItem(ICON_FA_FILE_ARCHIVE " Profile backups", nullptr, false, Utility::Directory::exists(_backupsDir))) {
                     openUri(Utility::Directory::toNativeSeparators(_backupsDir));
                 }
 
-                if(ImGui::MenuItem(ICON_FA_EXCHANGE_ALT " Staging area", nullptr, false, _massManager != nullptr)) {
+                if(ImGui::MenuItem(ICON_FA_EXCHANGE_ALT " Staging area", nullptr, false, Utility::Directory::exists(_stagingDir))) {
                     openUri(Utility::Directory::toNativeSeparators(_stagingDir));
                 }
 
@@ -54,6 +54,43 @@ void SaveTool::drawMainMenu() {
 
             ImGui::Separator();
 
+            if(ImGui::BeginMenu(ICON_FA_COG " Settings")) {
+                ImGui::Checkbox("Cheat mode", &_cheatMode);
+                ImGui::SameLine();
+                ImGui::AlignTextToFramePadding();
+                drawHelpMarker("This gives access to save edition features that can be considered cheats.",
+                               Float(windowSize().x()) * 0.4f);
+
+                ImGui::Checkbox("Unsafe mode", &_unsafeMode);
+                ImGui::SameLine();
+                ImGui::AlignTextToFramePadding();
+                drawHelpMarker("This allows changing the state of save files in the game's save folder even when the game is running.",
+                               Float(windowSize().x()) * 0.4f);
+
+                ImGui::Checkbox("Check for updates on startup", &_checkUpdatesOnStartup);
+                ImGui::SameLine();
+                if(ImGui::Button(ICON_FA_SYNC_ALT " Check now")) {
+                    _queue.addToast(Toast::Type::Default, "Checking for updates...");
+                    _thread = std::thread{[this]{ checkForUpdates(); }};
+                }
+
+                if(_updateAvailable) {
+                    ImGui::AlignTextToFramePadding();
+                    ImGui::Text("Version %s is available.", _latestVersion.c_str());
+                    if(ImGui::Button(ICON_FA_FILE_SIGNATURE " Release notes")) {
+                        openUri(_releaseLink);
+                    }
+                    ImGui::SameLine();
+                    if(ImGui::Button(ICON_FA_DOWNLOAD " Download now")) {
+                        openUri(_downloadLink);
+                    }
+                }
+
+                ImGui::EndMenu();
+            }
+
+            ImGui::Separator();
+
             if(ImGui::MenuItem(ICON_FA_SIGN_OUT_ALT " Quit##QuitMenuItem")) {
                 exit(EXIT_SUCCESS);
             }

src/ToastQueue/ToastQueue.cpp

@@ -0,0 +1,162 @@
+// MassBuilderSaveTool
+// Copyright (C) 2021 Guillaume Jacquemin
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+#include <Corrade/Utility/FormatStl.h>
+
+#include <Magnum/Math/Functions.h>
+
+#include <imgui.h>
+
+#include "../FontAwesome/IconsFontAwesome5.h"
+
+#include "ToastQueue.h"
+
+using namespace Corrade;
+
+constexpr UnsignedInt success_colour = 0xff67d23bu;
+constexpr UnsignedInt info_colour    = 0xffcc832fu;
+constexpr UnsignedInt warning_colour = 0xff2fcfc7u;
+constexpr UnsignedInt error_colour   = 0xff3134cdu;
+
+constexpr UnsignedInt fade_time = 150;
+constexpr Float base_opacity = 1.0f;
+constexpr Vector2 padding{20.0f, 20.0f};
+constexpr Float toast_spacing = 10.0f;
+
+Toast::Toast(Type type, const std::string& message, std::chrono::milliseconds timeout):
+    _type{type}, _message{message}, _timeout{timeout}, _creationTime{std::chrono::steady_clock::now()}
+{
+    _phaseTrack = Animation::Track<UnsignedInt, Phase>{{
+        {0,                           Phase::FadeIn},
+        {fade_time,                   Phase::Wait},
+        {fade_time + timeout.count(), Phase::FadeOut},
+        {(fade_time * 2) + timeout.count(), Phase::TimedOut}
+    }, Math::select, Animation::Extrapolation::Constant};
+}
+
+auto Toast::type() -> Type {
+    return _type;
+}
+
+auto Toast::message() -> const std::string& {
+    return _message;
+}
+
+auto Toast::timeout() -> std::chrono::milliseconds {
+    return _timeout;
+}
+
+auto Toast::creationTime() -> std::chrono::steady_clock::time_point {
+    return _creationTime;
+}
+
+auto Toast::elapsedTime() -> std::chrono::milliseconds {
+    return std::chrono::duration_cast<std::chrono::milliseconds>(std::chrono::steady_clock::now() - _creationTime);
+}
+
+auto Toast::phase() -> Phase {
+    return _phaseTrack.at(elapsedTime().count());
+}
+
+auto Toast::opacity() -> Float {
+    Phase phase = this->phase();
+    Long elapsed_time = elapsedTime().count();
+
+    if(phase == Phase::FadeIn) {
+        return Float(elapsed_time) / Float(fade_time);
+    }
+    else if(phase == Phase::FadeOut) {
+        return 1.0f - ((Float(elapsed_time) - Float(fade_time) - Float(_timeout.count())) / Float(fade_time));
+    }
+
+    return 1.0f;
+}
+
+void ToastQueue::addToast(Toast&& toast) {
+    _toasts.push_back(std::move(toast));
+}
+
+void ToastQueue::addToast(Toast::Type type, const std::string& message, std::chrono::milliseconds timeout) {
+    _toasts.emplace_back(type, message, timeout);
+}
+
+void ToastQueue::draw(Vector2i viewport_size) {
+    Float height = 0.0f;
+
+    for(UnsignedInt i = 0; i < _toasts.size(); i++) {
+        Toast* current = &_toasts[i];
+
+        if(current->phase() == Toast::Phase::TimedOut) {
+            removeToast(i);
+            continue;
+        }
+
+        std::string win_id = Utility::formatString("##Toast{}", i);
+
+        Float opacity = base_opacity * current->opacity();
+
+        ImGui::PushStyleVar(ImGuiStyleVar_Alpha, opacity);
+
+        ImGui::SetNextWindowPos({viewport_size.x() - padding.x(), viewport_size.y() - padding.y() - height}, ImGuiCond_Always, {1.0f, 1.0f});
+        if(ImGui::Begin(win_id.c_str(), nullptr,
+                        ImGuiWindowFlags_AlwaysAutoResize|ImGuiWindowFlags_NoDecoration|
+                        ImGuiWindowFlags_NoInputs|ImGuiWindowFlags_NoNav|ImGuiWindowFlags_NoFocusOnAppearing))
+        {
+            ImColor colour = 0xffffffff;
+
+            switch(current->type()) {
+                case Toast::Type::Default:
+                    break;
+                case Toast::Type::Success:
+                    colour = success_colour;
+                    ImGui::TextColored(colour, ICON_FA_CHECK_CIRCLE);
+                    break;
+                case Toast::Type::Info:
+                    colour = info_colour;
+                    ImGui::TextColored(colour, ICON_FA_INFO_CIRCLE);
+                    break;
+                case Toast::Type::Warning:
+                    colour = warning_colour;
+                    ImGui::TextColored(colour, ICON_FA_EXCLAMATION_TRIANGLE);
+                    break;
+                case Toast::Type::Error:
+                    colour = error_colour;
+                    ImGui::TextColored(colour, ICON_FA_TIMES_CIRCLE);
+                    break;
+            }
+
+            if(current->type() != Toast::Type::Default) {
+                ImGui::SameLine();
+            }
+
+            if(current->message().length() > 127) {
+                ImGui::TextColored(colour, "%.*s...", 127, current->message().c_str());
+            }
+            else {
+                ImGui::TextColored(colour, current->message().c_str());
+            }
+
+            height += ImGui::GetWindowHeight() + toast_spacing;
+        }
+        ImGui::End();
+
+        ImGui::PopStyleVar();
+    }
+}
+
+void ToastQueue::removeToast(Long index) {
+    _toasts.erase(_toasts.begin() + index);
+}

src/ToastQueue/ToastQueue.h

@@ -0,0 +1,82 @@
+#pragma once
+
+// MassBuilderSaveTool
+// Copyright (C) 2021 Guillaume Jacquemin
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+#include <chrono>
+#include <string>
+#include <vector>
+
+#include <Magnum/Magnum.h>
+#include <Magnum/Animation/Track.h>
+
+using namespace Magnum;
+
+class Toast {
+    public:
+        enum class Type : UnsignedByte {
+            Default, Success, Info, Warning, Error
+        };
+
+        enum class Phase : UnsignedByte {
+            FadeIn, Wait, FadeOut, TimedOut
+        };
+
+        explicit Toast(Type type, const std::string& message,
+                       std::chrono::milliseconds timeout = std::chrono::milliseconds{3000});
+
+        Toast(const Toast& other) = delete;
+        Toast& operator=(const Toast& other) = delete;
+
+        Toast(Toast&& other) = default;
+        Toast& operator=(Toast&& other) = default;
+
+        auto type() -> Type;
+
+        auto message() -> std::string const&;
+
+        auto timeout() -> std::chrono::milliseconds;
+
+        auto creationTime() -> std::chrono::steady_clock::time_point;
+
+        auto elapsedTime() -> std::chrono::milliseconds;
+
+        auto phase() -> Phase;
+
+        auto opacity() -> Float;
+
+    private:
+        Type _type{Type::Default};
+        std::string _message;
+        std::chrono::milliseconds _timeout;
+        std::chrono::steady_clock::time_point _creationTime;
+        Animation::Track<UnsignedInt, Phase> _phaseTrack;
+};
+
+class ToastQueue {
+    public:
+        void addToast(Toast&& toast);
+
+        void addToast(Toast::Type type, const std::string& message,
+                      std::chrono::milliseconds timeout = std::chrono::milliseconds{3000});
+
+        void draw(Vector2i viewport_size);
+
+    private:
+        void removeToast(Long index);
+
+        std::vector<Toast> _toasts;
+};

src/assets.conf

@@ -43,3 +43,11 @@ alias=LICENSE.libzip
 [file]
 filename=../third-party/efsw/LICENSE
 alias=LICENSE.efsw
+
+[file]
+filename=../third-party/cpr/LICENSE
+alias=LICENSE.cpr
+
+[file]
+filename=../third-party/json/LICENSE.MIT
+alias=LICENSE.json

src/main.cpp

@@ -18,7 +18,25 @@
 
 #include <fstream>
 
+#include <errhandlingapi.h>
+#include <synchapi.h>
+#include <winerror.h>
+
 int main(int argc, char** argv) {
+    void* mutex_handle = CreateMutexW(nullptr, 0, L"MassBuilderSaveTool");
+
+    if(!mutex_handle) {
+        SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "Error initialising the app",
+                                 "There was an error initialising the mutex.",nullptr);
+        return EXIT_FAILURE;
+    }
+
+    if(GetLastError() == ERROR_ALREADY_EXISTS) {
+        SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "Error initialising the app",
+                                 "There can be only one running instance of the application.",nullptr);
+        return EXIT_FAILURE;
+    }
+
 #ifndef SAVETOOL_DEBUG_BUILD
     std::ofstream output{"SaveToolLog.txt", std::ios::trunc|std::ios::out};
 
@@ -28,5 +46,9 @@ int main(int argc, char** argv) {
 #endif
 
     SaveTool app({argc, argv});
-    return app.exec();
+    Int result = app.exec();
+
+    ReleaseMutex(mutex_handle);
+
+    return result;
 }

third-party/cpr

@@ -0,0 +1 @@
+Subproject commit 814bd0926379cfc786dd1d9df9ce266a4bb6cf59

third-party/json

@@ -0,0 +1 @@
+Subproject commit 350ff4f7ced7c4117eae2fb93df02823c8021fcb