[UX Improvement] Catch save loading errors and notify user (#3979)

* Add `SohModalWindow` and `SohModal`. Runs as window, always "visible", but not drawing if no popups are registered.

Adds error catching for save file corruption (malformed json) that renames the file in question to prevent future loading issues and uses `SohModalWindow` to inform the user of the error.

* Apply suggestions from code review

---------

Co-authored-by: briaguya <70942617+briaguya-ai@users.noreply.github.com>

soh/soh/SaveManager.cpp

@@ -9,6 +9,7 @@
 #include <variables.h>
 #include "soh/Enhancements/boss-rush/BossRush.h"
 #include <libultraship/libultraship.h>
+#include "SohGui.hpp"
 
 #define NOGDI // avoid various windows defines that conflict with things in z64.h
 #include <spdlog/spdlog.h>
@@ -1023,53 +1024,70 @@ void SaveManager::SaveGlobal() {
     output << std::setw(4) << globalBlock << std::endl;
 }
 
+
 void SaveManager::LoadFile(int fileNum) {
     SPDLOG_INFO("Load File - fileNum: {}", fileNum);
-    assert(std::filesystem::exists(GetFileName(fileNum)));
+    std::filesystem::path fileName = GetFileName(fileNum);
+    assert(std::filesystem::exists(fileName));
     InitFile(false);
 
-    std::ifstream input(GetFileName(fileNum));
-
-    saveBlock = nlohmann::json::object();
-    input >> saveBlock;
-    if (!saveBlock.contains("version")) {
-        SPDLOG_ERROR("Save at " + GetFileName(fileNum).string() + " contains no version");
-        assert(false);
-    }
-    switch (saveBlock["version"].get<int>()) {
-        case 1:
-            for (auto& block : saveBlock["sections"].items()) {
-                int sectionVersion = block.value()["version"];
-                std::string sectionName = block.key();
-                if (!sectionLoadHandlers.contains(sectionName)) {
-                    // Unloadable sections aren't necessarily errors, they are probably mods that were unloaded
-                    // TODO report in a more noticeable manner
-                    SPDLOG_WARN("Save " + GetFileName(fileNum).string() + " contains unloadable section " + sectionName);
-                    continue;
-                }
-                SectionLoadHandler& handler = sectionLoadHandlers[sectionName];
-                if (!handler.contains(sectionVersion)) {
-                    // A section that has a loader without a handler for the specific version means that the user has a mod
-                    // at an earlier version than the save has. In this case, the user probably wants to load the save.
-                    // Report the error so that the user can rectify the error.
-                    // TODO report in a more noticeable manner
-                    SPDLOG_ERROR("Save " + GetFileName(fileNum).string() + " contains section " + sectionName +
-                                 " with an unloadable version " + std::to_string(sectionVersion));
-                    assert(false);
-                    continue;
-                }
-                currentJsonContext = &block.value()["data"];
-                handler[sectionVersion]();
-            }
-            break;
-        default:
-            SPDLOG_ERROR("Unrecognized save version " + std::to_string(saveBlock["version"].get<int>()) + " in " +
-                         GetFileName(fileNum).string());
+    std::ifstream input(fileName);
+    
+    try {
+        saveBlock = nlohmann::json::object();
+        input >> saveBlock;
+        if (!saveBlock.contains("version")) {
+            SPDLOG_ERROR("Save at " + fileName.string() + " contains no version");
             assert(false);
-            break;
+        }
+        switch (saveBlock["version"].get<int>()) {
+            case 1:
+                for (auto& block : saveBlock["sections"].items()) {
+                    int sectionVersion = block.value()["version"];
+                    std::string sectionName = block.key();
+                    if (!sectionLoadHandlers.contains(sectionName)) {
+                        // Unloadable sections aren't necessarily errors, they are probably mods that were unloaded
+                        // TODO report in a more noticeable manner
+                        SPDLOG_WARN("Save " + GetFileName(fileNum).string() + " contains unloadable section " +
+                                    sectionName);
+                        continue;
+                    }
+                    SectionLoadHandler& handler = sectionLoadHandlers[sectionName];
+                    if (!handler.contains(sectionVersion)) {
+                        // A section that has a loader without a handler for the specific version means that the user
+                        // has a mod at an earlier version than the save has. In this case, the user probably wants to
+                        // load the save. Report the error so that the user can rectify the error.
+                        // TODO report in a more noticeable manner
+                        SPDLOG_ERROR("Save " + GetFileName(fileNum).string() + " contains section " + sectionName +
+                                     " with an unloadable version " + std::to_string(sectionVersion));
+                        assert(false);
+                        continue;
+                    }
+                    currentJsonContext = &block.value()["data"];
+                    handler[sectionVersion]();
+                }
+                break;
+            default:
+                SPDLOG_ERROR("Unrecognized save version " + std::to_string(saveBlock["version"].get<int>()) + " in " +
+                             GetFileName(fileNum).string());
+                assert(false);
+                break;
+        }
+        InitMeta(fileNum);
+        GameInteractor::Instance->ExecuteHooks<GameInteractor::OnLoadFile>(fileNum);
+    } catch (const std::exception& e) {
+        input.close();
+        std::filesystem::path newFile(LUS::Context::GetPathRelativeToAppDirectory("Save") + ("/file" + std::to_string(fileNum + 1) + ".bak"));
+#if defined(__SWITCH__) || defined(__WIIU__)
+        copy_file(fileName.c_str(), newFile.c_str());
+#else
+        std::filesystem::copy_file(fileName, newFile);
+#endif
+    
+        std::filesystem::remove(fileName);
+        SohGui::RegisterPopup("Error loading save file", "A problem occurred loading the save in slot " + std::to_string(fileNum + 1) + ".\nSave file corruption is suspected.\n" +
+            "The file has been renamed to prevent further issues.");
     }
-    InitMeta(fileNum);
-    GameInteractor::Instance->ExecuteHooks<GameInteractor::OnLoadFile>(fileNum);
 }
 
 void SaveManager::ThreadPoolWait() {

soh/soh/SohGui.cpp

@@ -125,6 +125,7 @@ namespace SohGui {
     std::shared_ptr<ItemTrackerSettingsWindow> mItemTrackerSettingsWindow;
     std::shared_ptr<ItemTrackerWindow> mItemTrackerWindow;
     std::shared_ptr<RandomizerSettingsWindow> mRandomizerSettingsWindow;
+    std::shared_ptr<SohModalWindow> mModalWindow;
 
     void SetupGuiElements() {
         auto gui = LUS::Context::GetInstance()->GetWindow()->GetGui();
@@ -183,9 +184,13 @@ namespace SohGui {
         gui->AddGuiWindow(mItemTrackerSettingsWindow);
         mRandomizerSettingsWindow = std::make_shared<RandomizerSettingsWindow>("gRandomizerSettingsEnabled", "Randomizer Settings");
         gui->AddGuiWindow(mRandomizerSettingsWindow);
+        mModalWindow = std::make_shared<SohModalWindow>("gOpenWindows.modalWindowEnabled", "Modal Window");
+        gui->AddGuiWindow(mModalWindow);
+        mModalWindow->Show();
     }
 
     void Destroy() {
+        mModalWindow = nullptr;
         mRandomizerSettingsWindow = nullptr;
         mItemTrackerWindow = nullptr;
         mItemTrackerSettingsWindow = nullptr;
@@ -205,4 +210,8 @@ namespace SohGui {
         mConsoleWindow = nullptr;
         mSohMenuBar = nullptr;
     }
+
+    void RegisterPopup(std::string title, std::string message, std::string button1, std::string button2, std::function<void()> button1callback, std::function<void()> button2callback) {
+        mModalWindow->RegisterPopup(title, message, button1, button2, button1callback, button2callback);
+    }
 }

soh/soh/SohGui.hpp

@@ -22,6 +22,7 @@
 #include "Enhancements/randomizer/randomizer_entrance_tracker.h"
 #include "Enhancements/randomizer/randomizer_item_tracker.h"
 #include "Enhancements/randomizer/randomizer_settings_window.h"
+#include "SohModals.h"
 
 #ifdef __cplusplus
 extern "C" {
@@ -37,6 +38,7 @@ namespace SohGui {
     void SetupGuiElements();
     void Draw();
     void Destroy();
+    void RegisterPopup(std::string title, std::string message, std::string button1 = "OK", std::string button2 = "", std::function<void()> button1callback = nullptr, std::function<void()> button2callback = nullptr);
 }
 
 #endif /* SohGui_hpp */

soh/soh/SohModals.cpp

@@ -0,0 +1,54 @@
+#include "SohModals.h"
+#include "ImGui/imgui.h"
+#include <vector>
+#include <string>
+#include <libultraship/bridge.h>
+#include <libultraship/libultraship.h>
+#include "UIWidgets.hpp"
+#include "OTRGlobals.h"
+#include "z64.h"
+
+extern "C" PlayState* gPlayState;
+struct SohModal {
+    std::string title_;
+    std::string message_;
+    std::string button1_;
+    std::string button2_;
+    std::function<void()> button1callback_;
+    std::function<void()> button2callback_;
+};
+std::vector<SohModal> modals;
+
+void SohModalWindow::DrawElement() {
+    if (modals.size() > 0) {
+        SohModal curModal = modals.at(0);
+        if (!ImGui::IsPopupOpen(curModal.title_.c_str())) {
+            ImGui::OpenPopup(curModal.title_.c_str());
+        }
+        if (ImGui::BeginPopupModal(curModal.title_.c_str(), NULL, ImGuiWindowFlags_AlwaysAutoResize | ImGuiWindowFlags_NoResize | ImGuiWindowFlags_NoMove | ImGuiWindowFlags_NoScrollbar | ImGuiWindowFlags_NoSavedSettings)) {
+            ImGui::Text(curModal.message_.c_str());
+            if (ImGui::Button(curModal.button1_.c_str())) {
+                if (curModal.button1callback_ != nullptr) {
+                    curModal.button1callback_();
+                }
+                ImGui::CloseCurrentPopup();
+                modals.erase(modals.begin());
+            }
+            ImGui::SameLine();
+            if (curModal.button2_ != "") {
+                if (ImGui::Button(curModal.button2_.c_str())) {
+                    if (curModal.button2callback_ != nullptr) {
+                        curModal.button2callback_();
+                    }
+                    ImGui::CloseCurrentPopup();
+                    modals.erase(modals.begin());
+                }
+            }
+        }
+        ImGui::EndPopup();
+    }
+}
+
+void SohModalWindow::RegisterPopup(std::string title, std::string message, std::string button1, std::string button2, std::function<void()> button1callback, std::function<void()> button2callback) {
+    modals.push_back({ title, message, button1, button2, button1callback, button2callback });
+}

soh/soh/SohModals.h

@@ -0,0 +1,15 @@
+#pragma once
+
+#include <libultraship/libultraship.h>
+#include "window/gui/GuiMenuBar.h"
+#include "window/gui/GuiElement.h"
+
+class SohModalWindow : public LUS::GuiWindow {
+  public:
+    using LUS::GuiWindow::GuiWindow;
+
+    void InitElement() override {};
+    void DrawElement() override;
+    void UpdateElement() override {};
+    void RegisterPopup(std::string title, std::string message, std::string button1 = "OK", std::string button2 = "", std::function<void()> button1callback = nullptr, std::function<void()> button2callback = nullptr);
+};