#include <iostream>
#include <fstream>

struct Player
{
	int id = 0;
	char* name;
	int rank;
};
void writePlayersFile(Player* playersArr, int playersSize, int append = 0)
{
	std::ofstream outf;
	outf.open("file.dat", std::ios::binary | append ? std::ios::app : 0);
	for (int i = 0; i < playersSize; i++)
	{
		outf.write((char*)& playersArr[i].id, sizeof(int));
		size_t nameLen = strlen(playersArr[i].name) + 1;
		outf.write(playersArr[i].name, nameLen);
		if (nameLen < 50) { outf.seekp(50 - nameLen, std::ios::cur); };
		outf.write((char*)& playersArr[i].rank, sizeof(int));
	}
	outf.close();
}
void readPlayersFile(Player* playersArr, int playersSize)
{
	std::ifstream inf;
	inf.open("file.dat", std::ios::binary);
	char buf[100];
	for (int i = 0; i < playersSize; i++)
	{
		inf.read((char*)& playersArr[i].id, sizeof(int));
		for (int i = 0; inf.read(buf + i, 1), buf[i] and i < 100; i++);
		int nameLen = strlen(buf) + 1;
		playersArr[i].name = new char[nameLen];
		strcpy(playersArr[i].name, buf);
		if (nameLen < 50) { inf.seekg(50 - nameLen, std::ios::cur); };
		inf.read((char*)& playersArr[i].rank, sizeof(int));
	}
	inf.close();
}

int changePlayersFileById(int searchId, const char* name)
{
	std::fstream file;
	file.open("file.dat", std::ios::in | std::ios::out | std::ios::binary);

	int id = 0;
	int nameLen = 0;
	for (int i = 0; i < 3; i++)
	{

		file.read((char*)&id, sizeof(id));
		if (id == searchId)
		{
			nameLen = strlen(name) + 1;
			file.seekp((int)file.tellg(), std::ios::beg);
			file.write(name, nameLen);
			file.close();
			return 0;
		}
		file.seekg(50 + 4, std::ios::cur);
	}
	file.close();
	return 1;
}
void printPlayersArr(Player* playersArr, int playersSize)
{
	for (int i = 0; i < playersSize; i++)
	{
		std::cout << playersArr[i].id << ' ' << playersArr[i].name << ' ' << playersArr[i].rank << '\n';
	}
}

int main()
{

	Player players[3]{ {2607, new char[sizeof("MadMax")]{"MadMax"}, 39},{2802, new char[sizeof("Batman")]{"Batman"}, 25},{2902, new char[sizeof("Joker")]{"Joker"}, 15} };
	writePlayersFile(players, 3);
	for (int i = 0; i < 3; i++) { delete[] players[i].name; };

	Player readPlayers[3]{};
	readPlayersFile(readPlayers, 3);
	printPlayersArr(readPlayers, 3);
	for (int i = 0; i < 3; i++) { delete[] readPlayers[i].name; };


	changePlayersFileById(2802, "BATMAN FOREVER YOUNG!");
	changePlayersFileById(2902, "Joker Rockker :]");
	readPlayersFile(readPlayers, 3);
	printPlayersArr(readPlayers, 3);
	for (int i = 0; i < 3; i++) { delete[] readPlayers[i].name; };
}