/* 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 2
 * 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, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 */

//include <cstdio>
#include "ags/engine/debugging/filebasedagsdebugger.h"
#include "ags/engine/ac/file.h"                    // filelength()
#include "ags/shared/util/stream.h"
#include "ags/shared/util/textstreamwriter.h"
#include "ags/shared/util/wgt2allg.h"              // exists()
#include "ags/engine/platform/base/agsplatformdriver.h"
#include "common/system.h"
#include "common/savefile.h"

namespace AGS3 {

using AGS::Shared::Stream;
using AGS::Shared::TextStreamWriter;

const char *SENT_MESSAGE_FILE_NAME = "dbgrecv.tmp";

static bool exists(const char *filename) {
	Common::InSaveFile *save = g_system->getSavefileManager()->openForLoading(filename);
	bool result = save != nullptr;
	delete save;

	return result;
}

static bool remove(const char *filename) {
	return g_system->getSavefileManager()->removeSavefile(filename);
}

bool FileBasedAGSDebugger::Initialize() {
	if (exists(SENT_MESSAGE_FILE_NAME)) {
		remove(SENT_MESSAGE_FILE_NAME);
	}
	return true;
}

void FileBasedAGSDebugger::Shutdown() {
}

bool FileBasedAGSDebugger::SendMessageToEditor(const char *message) {
	while (exists(SENT_MESSAGE_FILE_NAME)) {
		platform->YieldCPU();
	}

	Stream *out = Shared::File::CreateFile(SENT_MESSAGE_FILE_NAME);
	// CHECKME: originally the file was opened as "wb" for some reason,
	// which means the message should be written as a binary array;
	// or shouldn't it?
	out->Write(message, strlen(message));
	delete out;
	return true;
}

bool FileBasedAGSDebugger::IsMessageAvailable() {
	return exists("dbgsend.tmp");
}

char *FileBasedAGSDebugger::GetNextMessage() {
	Stream *in = Shared::File::OpenFileRead("dbgsend.tmp");
	if (in == nullptr) {
		// check again, because the editor might have deleted the file in the meantime
		return nullptr;
	}
	int fileSize = in->GetLength();
	char *msg = (char *)malloc(fileSize + 1);
	in->Read(msg, fileSize);
	delete in;
	::remove("dbgsend.tmp");
	msg[fileSize] = 0;
	return msg;
}

} // namespace AGS3