#include<bits/stdc++.h>
#include<windows.h>
#include<conio.h>


using namespace std;


FILE *fin;
FILE *fout;
char user_name[65535];

void gotoxy(short,short);
COORD getxy();
void theme();
void Login();

int main()
{
	Login();
	return 0;
}

void theme()
{
	//do something 
}

void Login()
{
	puts("\t\t\t1.Login  /  2.register\n\n\n\t\t\t   input \"1\" or \"2\"");
	char ch=_getch();
	if(ch=='2')
	{
		fclose(fin);
		printf("\t\t\t\t\tregister\n");
		char s[65535];
		bool flag;
		do
		{
			flag=true;
			printf("Please Input Your User Name By Letter, Underline or Number\n");
			scanf("%s",&s);
			for(int i=0;i<strlen(s);i++)
				flag=flag and ((s[i]>64 and s[i]<91) or (s[i]>47 and s[i]<58) or (s[i]>96 and s[i]<123) or s[i]=='_');
		}while(!flag);
		if((fin=fopen(s,"rb"))!=NULL)
		{
			MessageBox(NULL,"The name is in use","From the app",MB_ICONSTOP);
			system("CLS");
			Login();
			exit(0);
		}
		printf("Set Your Password:\n");
		
		char pwd[65535]="";
		char ch;
		while((ch=_getch())!='\r')
		{
			if(ch=='\b' and strlen(pwd))
			{
				pwd[strlen(pwd)-1]=0;
				COORD console=getxy();
				gotoxy(console.X-1,console.Y);
				putchar(' ');
				gotoxy(console.X-1,console.Y);
			} 
			else if(ch!='\b')
			{
				putchar('*');
				pwd[strlen(pwd)]=ch;
			}
		}
		for(int i=0;i<strlen(pwd);i++)
			if(pwd[i]<48)
			{
				MessageBox(NULL,"This String Cannot Be Your Password. ","From the app",MB_ICONSTOP);
				system("CLS");
				Login();
				exit(0);
			}
		printf("\nPlease Confirm Your Password:\n");
		char str[65535];
		scanf("%s",&str);
		if(strlen(str)!=strlen(pwd))
		{
			MessageBox(NULL,"The operation failed. ","From the app",MB_ICONSTOP);
			system("CLS");
			Login();
			exit(0);
		}
		for(int i=0;i<strlen(str);i++)
			if(str[i]!=pwd[i])
			{
				MessageBox(NULL,"The operation failed. ","From the app",MB_ICONSTOP);
				system("CLS");
				Login();
				exit(0);
			}
		fout=fopen(s,"wb");
		fprintf(fout,"%s\n%s\n",s,pwd);
		fclose(fout);
		MessageBox(NULL,"The operation succeeded! ","From the app",MB_ICONINFORMATION);
		sprintf(user_name,"%s",&s);
		theme();
	}
	else if(ch=='1')
	{
		fclose(fin);
		char user[65535],true_pwd[65535],s[65535],pwd[65535];
		printf("\t\t\t\t\tLogin\nUser Name:");
		scanf("%s",&s);
		if((fin=fopen(s,"rb"))==NULL)
		{
			MessageBox(NULL,"No Such User Here. ","From the app",MB_ICONSTOP);
			system("CLS");
			Login();
			exit(0);
		}
		fscanf(fin,"%s%s",user,true_pwd);
		fclose(fin);
		if(strlen(user)!=strlen(s))
		{
			MessageBox(NULL,"No Such User Here. ","From the app",MB_ICONSTOP);
			system("CLS");
			Login();
			exit(0);
		}
		for(int i=0;i<strlen(user);i++)
			if(user[i]!=s[i])
			{
				MessageBox(NULL,"No Such User Here. ","From the app",MB_ICONSTOP);
				system("CLS");
				Login();
				exit(0);
			}
		printf("password: ");
		char ch;
		while((ch=_getch())!='\r')
		{
			if(ch=='\b' and strlen(pwd))
			{
				pwd[strlen(pwd)-1]=0;
				COORD console=getxy();
				gotoxy(console.X-1,console.Y);
				putchar(' ');
				gotoxy(console.X-1,console.Y);
			}
			else if(ch!='\b')
			{
				putchar('*');
				pwd[strlen(pwd)]=ch;
			}
		}
		if(strlen(pwd)!=strlen(true_pwd))
		{
			MessageBox(NULL,"The operation failed. ","From the app",MB_ICONSTOP);
			system("CLS");
			Login();
			exit(0);
		}
		for(int i=0;i<strlen(pwd);i++)
			if(pwd[i]!=true_pwd[i])
			{
				MessageBox(NULL,"The operation failed. ","From the app",MB_ICONSTOP);
				system("CLS");
				Login();
				exit(0);
			}
		MessageBox(NULL,"The operation succeeded! ","From the app",MB_ICONINFORMATION);
		sprintf(user_name,"%s",&s);
		theme();
	}
	else
	{
		MessageBox(NULL,"Wrong Code","From the app",MB_ICONSTOP);
		system("CLS");
		Login();
		exit(0);
	}
}



void gotoxy(short x, short y)
{
    COORD coord={x,y};
    SetConsoleCursorPosition(GetStdHandle(STD_OUTPUT_HANDLE),coord);
}

COORD getxy()
{
	HANDLE hStdout;
	CONSOLE_SCREEN_BUFFER_INFO pBuffer;
	hStdout=GetStdHandle(STD_OUTPUT_HANDLE);
	GetConsoleScreenBufferInfo(hStdout,&pBuffer);
	return pBuffer.dwCursorPosition;
}