enderalse/SKSE/Plugins/fs_skse_plugin_functions/fs/Achievements.cpp

#include "Achievements.h"
#include "skse64/GameMenus.h"
#include "skse64/GameEvents.h"
#include "steam\steam_api.h"
#include <string>
#include <processenv.h>

class InitSteamOnEvent : public BSTEventSink<MenuOpenCloseEvent> {
public:
	virtual ~InitSteamOnEvent() {}
	virtual	EventResult ReceiveEvent(MenuOpenCloseEvent * evn, EventDispatcher<MenuOpenCloseEvent> * dispatcher) {
		if (std::strcmp(evn->menuName.data, "Main Menu")) {
			_MESSAGE("Main menu opened, trying to init steam API.");
			Achievements::startSteam();
		}
		return EventResult::kEvent_Continue;
	}
};

namespace Achievements {

	bool setAchievementUnlocked(StaticFunctionTag* tag, BSFixedString achievement)
	{
		return singleton->setAchievementUnlocked(achievement.data);
	}

	void registerMainMenuEvent() {
		MenuManager * mm = MenuManager::GetSingleton();
		if (mm) {
			mm->MenuOpenCloseEventDispatcher()->AddEventSink(new InitSteamOnEvent());
		}
		else {
			_MESSAGE("Failed to register SKSE menuEventHandler!");
		}
	}

	void steamInit(StaticFunctionTag* tag) {
		startSteam();
	}

	void startSteam()
	{
		try {
			if (singleton.get() == nullptr) {
				SteamAPI_Shutdown();
				SetEnvironmentVariable("SteamAppID", "933480");
				SetEnvironmentVariable("SteamGameId", "933480");
				bool success = SteamAPI_Init();
				if (success)
					_MESSAGE("Steam api init was successfull");
				else
					_MESSAGE("Error while initializing the steam api");
			
				singleton.swap(std::make_unique<AchievementHolder>());
				singleton->start();
			}
			else {
				_MESSAGE("Already initialized steam api, skipping it");
			}
		}
		catch (const std::exception& ex) {
			std::string msg = "Exception while initializing the Steam API, steam achievements will not be available: " + std::string(ex.what());
			_MESSAGE(msg.c_str());
		}
		
	}

	bool RegisterFuncs(VMClassRegistry * registry)
	{
		registry->RegisterFunction(new NativeFunction1<StaticFunctionTag, bool, BSFixedString>("UnlockAchievement", "Game", Achievements::setAchievementUnlocked, registry));
		registry->RegisterFunction(	new NativeFunction0<StaticFunctionTag, void>("SteamInit", "Game", Achievements::steamInit, registry));
		Achievements::registerMainMenuEvent();
		return true;
	}

	AchievementHolder::AchievementHolder() : stats(SteamUserStats()), callback(this, &AchievementHolder::onUserStatsReceived)
	{
	}

	void AchievementHolder::onUserStatsReceived(UserStatsReceived_t * event) {
		try {
			std::string msg = "User id: " + std::to_string(event->m_steamIDUser.ConvertToUint64()) + ", game id: " + std::to_string(event->m_nGameID) + ", success state: " + std::to_string(event->m_eResult);
			_MESSAGE(msg.c_str());

			uint32 achievementCount = this->stats->GetNumAchievements();
			msg = "There are " + std::to_string(achievementCount) + " achievements";
			_MESSAGE(msg.c_str());
		}
		catch (const std::exception& ex) {
			std::string msg = "Exception during steam callback: onUserStatsReceived. Failed to print data: " + std::string(ex.what());
			_MESSAGE(msg.c_str());
		}
	}

	bool AchievementHolder::setAchievementUnlocked(const char * achievementName)
	{
		std::string msg = "Unlocking achievement: " + std::string(achievementName);
		_MESSAGE(msg.c_str());
		bool success = this->stats->SetAchievement(achievementName);
		if (!success) {
			_MESSAGE("Error while unlocking achievement");
			return false;
		}
		success = this->stats->StoreStats();
		if (!success) {
			_MESSAGE("Error while storing unlocked achievement");
		}
		return success;
	}

	void AchievementHolder::start()
	{
		this->stats->RequestCurrentStats();
	}
}