/**************************************************************************/
/*  steam_tracker.cpp                                                     */
/**************************************************************************/
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/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
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#if defined(STEAMAPI_ENABLED)

#include "steam_tracker.h"

#include "core/io/file_access.h"

// https://partner.steamgames.com/doc/sdk/api#initialization_and_shutdown

SteamTracker::SteamTracker() {
	String path;
	if (OS::get_singleton()->has_feature("linuxbsd")) {
		path = OS::get_singleton()->get_executable_path().get_base_dir().path_join("libsteam_api.so");
		if (!FileAccess::exists(path)) {
			path = OS::get_singleton()->get_executable_path().get_base_dir().path_join("../lib").path_join("libsteam_api.so");
			if (!FileAccess::exists(path)) {
				return;
			}
		}
	} else if (OS::get_singleton()->has_feature("windows")) {
		if (OS::get_singleton()->has_feature("64")) {
			path = OS::get_singleton()->get_executable_path().get_base_dir().path_join("steam_api64.dll");
		} else {
			path = OS::get_singleton()->get_executable_path().get_base_dir().path_join("steam_api.dll");
		}
		if (!FileAccess::exists(path)) {
			return;
		}
	} else if (OS::get_singleton()->has_feature("macos")) {
		path = OS::get_singleton()->get_executable_path().get_base_dir().path_join("libsteam_api.dylib");
		if (!FileAccess::exists(path)) {
			path = OS::get_singleton()->get_executable_path().get_base_dir().path_join("../Frameworks").path_join("libsteam_api.dylib");
			if (!FileAccess::exists(path)) {
				return;
			}
		}
	} else {
		return;
	}

	Error err = OS::get_singleton()->open_dynamic_library(path, steam_library_handle);
	if (err != OK) {
		steam_library_handle = nullptr;
		return;
	}
	print_verbose("Loaded SteamAPI library");

	void *symbol_handle = nullptr;
	err = OS::get_singleton()->get_dynamic_library_symbol_handle(steam_library_handle, "SteamAPI_InitFlat", symbol_handle, true); // Try new API, 1.59+.
	if (err != OK) {
		err = OS::get_singleton()->get_dynamic_library_symbol_handle(steam_library_handle, "SteamAPI_Init", symbol_handle); // Try old API.
		if (err != OK) {
			return;
		}
		steam_init_function = (SteamAPI_InitFunction)symbol_handle;
	} else {
		steam_init_flat_function = (SteamAPI_InitFlatFunction)symbol_handle;
	}

	err = OS::get_singleton()->get_dynamic_library_symbol_handle(steam_library_handle, "SteamAPI_Shutdown", symbol_handle);
	if (err != OK) {
		return;
	}
	steam_shutdown_function = (SteamAPI_ShutdownFunction)symbol_handle;

	if (steam_init_flat_function) {
		char err_msg[1024] = {};
		steam_initialized = (steam_init_flat_function(&err_msg[0]) == SteamAPIInitResult_OK);
	} else if (steam_init_function) {
		steam_initialized = steam_init_function();
	}
}

SteamTracker::~SteamTracker() {
	if (steam_shutdown_function && steam_initialized) {
		steam_shutdown_function();
	}
	if (steam_library_handle) {
		OS::get_singleton()->close_dynamic_library(steam_library_handle);
	}
}

#endif // STEAMAPI_ENABLED
