/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * 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 <http://www.gnu.org/licenses/>.
 *
 */
 
// Disable symbol overrides so that we can use system headers.
#define FORBIDDEN_SYMBOL_ALLOW_ALL

#include "common/scummsys.h"

#if defined(DYNAMIC_MODULES) && defined(_WIN32)

#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <tchar.h>

#include "backends/platform/sdl/win32/win32_wrapper.h"
#include "backends/plugins/win32/win32-provider.h"
#include "backends/plugins/dynamic-plugin.h"
#include "common/debug.h"
#include "common/fs.h"

class Win32Plugin final : public DynamicPlugin {
protected:
	void *_dlHandle;

	VoidFunc findSymbol(const char *symbol) override {
		FARPROC func = GetProcAddress((HMODULE)_dlHandle, symbol);
		if (!func)
			debug("Failed loading symbol '%s' from plugin '%s'", symbol, _filename.c_str());

		return (void (*)())func;
	}

public:
	Win32Plugin(const Common::String &filename)
		: DynamicPlugin(filename), _dlHandle(0) {}

	bool loadPlugin() override {
		assert(!_dlHandle);
		TCHAR *tFilename = Win32::stringToTchar(_filename);
		_dlHandle = LoadLibrary(tFilename);
		free(tFilename);

		if (!_dlHandle) {
			debug("Failed loading plugin '%s' (error code %d)", _filename.c_str(), (int32) GetLastError());
			return false;
		} else {
			debug(1, "Success loading plugin '%s', handle %p", _filename.c_str(), _dlHandle);
		}

		return DynamicPlugin::loadPlugin();
	}

	void unloadPlugin() override {
		DynamicPlugin::unloadPlugin();
		if (_dlHandle) {
			if (!FreeLibrary((HMODULE)_dlHandle))
				debug("Failed unloading plugin '%s'", _filename.c_str());
			else
				debug(1, "Success unloading plugin '%s'", _filename.c_str());
			_dlHandle = 0;
		}
	}
};


Plugin* Win32PluginProvider::createPlugin(const Common::FSNode &node) const {
	return new Win32Plugin(node.getPath());
}

bool Win32PluginProvider::isPluginFilename(const Common::FSNode &node) const {
	// Check the plugin suffix
	Common::String filename = node.getName();
	if (!filename.hasSuffix(".dll"))
		return false;

	return true;
}


#endif // defined(DYNAMIC_MODULES) && defined(_WIN32)
