#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include<time.h>


struct date
{
    char usr_id[30]; //username confirmation
    int dd;
    int mm;
    int yy;
}dob;
struct u_address
{
    char usr_id[30]; //username confirmation
    char nation[10];
    char city[10];
    char tem_add[10];
    char perm_add[10];
    char ward_zip[10];
}a;

struct confidential_info
{
    char username[30];
    char password[30];
}usr_pswd;

struct general_info
{
    char f_name[30];
    char l_name[30];
    char ph_no[20];
    int age;
    char email[40];
    int pin;
    char password[25];
    char username[30];

    double user_balance;

}g_info;
/*
Functions protoypes are defined here:
they are 1)account creation
         2)registration form
         3)pin and username generator (random)
         4)account viewing (reading account information)
*/


/*
    To generate security login/pass for users, a random 4 digit pin is generated for users using rand() and srand
    ,and an account id is provided by the program. The id will have the following structure:
    *User's name*+*random string of length 4*
    and the password will use random generator for number of length 4, which will be stored in a dat or binary
    file.
*/
//Misc function
void starline();
void user_menu(char[]);

//Account creation
void account_create();
int pin_user();
void account_info();
int unique_user(char[]);
void read_account_info(char[]);


//for logging in
int loginscreen();
int login(char [],char []);

//User activity functions
void checkbalance(char[]);
void checkbookrequest(char[]);
void bankoperatingtime(char[]);
void transferfund(char[]);
void branch_ATM_locations(char[]);
void loan_status(char[]);
void change_password_pin(char[]);

//defintions
/*user menu for main function, this function needs to called repetedly, after user completeltes a certain
task, it also should have logoff option if possible
*/

//balance check

void checkbalance(char username[])
{
    FILE *fp;
    fp=fopen("User_Database_01.dat","r");
    while(!feof(fp))
    {
        fread(&g_info,sizeof(g_info),1,fp);
        if(strcmp(username,g_info.username)==0)
        {
            printf("\n\tCurrent Balance is %lf.",g_info.user_balance);
            fclose(fp);
            break;
        }
        else
            printf("Couldn't find balance, ERROR!");
            fclose(fp);
            break;
    }
    fclose(fp);
}









//Menu function
 void user_menu(char username[])
 {
    FILE *fp;
    fp=fopen("User_Database_01.dat","r");
    int choice;
    char repeat;
    printf("\n\n");
    starline();

    printf("\n\nWelcome To User Menu");
    printf("\n\t1.Check Balance");
    printf("\n\t2.Check Book Request");
    printf("\n\t3.Check Bank's Operating Hours");
    printf("\n\t4.Inquire Branch & ATM locations");
    printf("\n\t5.Check Loan Status");
    printf("\n\t6.Change Password or PIN");
    printf("\n\t7.View Account Info");
    printf("\n\n");
    printf("\n\tPlease choose an option:");
    scanf("%d",&choice);
    do
    {
    switch(choice)
    {
        case 1:
        printf("\n\tPlease Wait");
        checkbalance(username);
        break;

        case 2:
        printf("\n\tPlease Wait");

        break;

        case 3:
        printf("\n\tPlease Wait");

        break;

        case 4:
        printf("\n\tPlease Wait");

        break;

        case 5:
        printf("\n\tPlease Wait");

        break;

        case 6:
        printf("\n\tPlease Wait");

        break;

        case 7:
            printf("\n\nPlease Wait:");
           read_account_info(username);

        default:
            printf("\nPlease choose again.");
        exit(1);
    }
    printf("\nWould you like to access the menu again? (Y/N)");
    scanf("%c",&repeat);
    }
    while(repeat=='y' || repeat=='Y');
}




int unique_user(char incoming[])
{
    FILE *fp;
    fp=fopen("User_Database_01.dat","r");
    while(!feof(fp))
    {
        if(incoming==g_info.username)

            {
            fclose(fp);
            return 1;
            break;
            }
        else
            {
            return 0;
            break;
            }

    }
}

void starline() //a multi-purpose seperator
{
    int i;
    for(i=0;i<40;i++)
    {
        printf("***");
    }
}

//Function to create pin number, and the suffix for username

int pin_user()
{
    {
    srand(time(NULL));
    //This is a seed for random generator, using the current time.
    int random_pin=0;
    int i,j=0;
    while(j<4)
    {
        i=rand()%9;
        random_pin=random_pin*10+i;
        //This creates a 4-digit pin at the end of the loop
        j++;

    }
    return random_pin;
    //return value is used in the registration function to get the pin to the user.

    }

}

//Function to create account
void account_create()
{
    FILE *fp;
    FILE *fp1,*fp2,*fp3;
    int suffix_int,i;
    char username[34];  //suffix for a username
    int pin;    //pin for 2 step authentication
    printf("\n\t\t\t\t\tWelcome to account creation");
    printf("\n\n");
    starline();
    fp=fopen("User_Database_01.dat","a");
    fflush(stdin);
    printf("\nEnter first name:");
    gets(g_info.f_name);
    fflush(stdin);
    printf("\nEnter your last name:");
    gets(g_info.l_name);
    fflush(stdin);
    printf("\nEnter contact number:");
    gets(g_info.ph_no);
    printf("\nEnter your age:");
    scanf("%d",&g_info.age);
    fflush(stdin);
    printf("\nEnter your email address:");
    gets(g_info.email);
    g_info.user_balance=0.00;

    /*Now the program generates a random number
    to assign the username, and create an account number,and create a 4
    digit pin, which is used to log in along with the password.*/

    printf("\tPlease wait while we generate a pin number.");
    pin=pin_user();
    printf("\a");
    printf("\nYour pin number is %04d",pin);
    printf("\nPlease keep your pin secure, and do not tell it to anyone.");
    g_info.pin=pin;
    fflush(stdin);
    printf("\nPlease create a secure password:");
    gets(g_info.password);
    RETRYING:g_info.pin=pin;
    //creating pin for authentication, with a GOTO marker for retrying.

    //now we create a suffix to generate a username
    suffix_int=pin_user();
    sprintf(username,"%s%04d",g_info.f_name,suffix_int);
    //sprintf combines integer and the string to create a username.

    i=unique_user(username);
    if(i==0)
    {
        printf("\nYour username is:%s",username);
        USR_CONFIRM:printf("\nPlease re-type your username for confirmation:");
        //puts(g_info.username);
    }

    else goto RETRYING;
    fflush(stdin);
    //re-confirmation stores the username in the struct's "username" now
    gets(g_info.username);
    fwrite(&g_info,sizeof(g_info),1,fp);
    //Date of Birth input
        printf("\nEnter date of birth");
        //The format is yy/mm/dd.
        //The output format would be the same.

    fp1=fopen("User_DOB.dat","a");
    //opening file for DOB storage
    printf("\n\tYear:");
    scanf("%d",&dob.yy);
    printf("\n\tMonth:");
    scanf("%d",&dob.mm);
    printf("\n\tDay:");
    scanf("%d",&dob.dd);

    //opening file for User Addresses
    fp3=fopen("User_addresses.dat","a");

    //Input for both temp and permanent address of user
    printf("\nEnter Address");
    fflush(stdin);
    printf("\n\tCountry:");
    gets(a.nation);  //"a" is the structure for address. Define inside g_info (general info)
    fflush(stdin);
    printf("\n\tCity:");
    gets(a.city);
    fflush(stdin);
    printf("\n\tEnter temporary address:");
    gets(a.tem_add);
    fflush(stdin);
    printf("\n\tEnter permanent address:");
    gets(a.perm_add);
    fflush(stdin);
    printf("\n\tEnter Ward/Zip code:");
    gets(a.ward_zip);
    printf("\a");


    printf("\a");
    //opening file for Confidential info
    fp2=fopen("Confidental.dat","a");
    //copying password and username to a seperate file for quick access.

//    This string will be used to confirm and display information for all the files.
//   For this purpose, we are now copying it throughout all the three files.


    strcpy(usr_pswd.username,g_info.username);
    strcpy(usr_pswd.password,g_info.password);
    fwrite(&usr_pswd,sizeof(usr_pswd),1,fp2);
    //copying usernames to other files for verification

    strcpy(dob.usr_id,g_info.username);
    strcpy(a.usr_id,g_info.username);
    fwrite(&a,sizeof(a),1,fp3);
    fwrite(&dob,sizeof(dob),1,fp1);

    fclose(fp);
    fclose(fp2);
    fclose(fp1);
    fclose(fp3);
}

//The login screen function
int loginscreen()
{
    FILE *fp;
    int confirm;
    char user[40],password[40];
    int compare;
    fp=fopen("User_Database_01.dat","r");
    ATTEMPT:printf("\nEnter username:");
    scanf("%s",user);
    printf("\nEnter password:");
    scanf("%s",password);

    confirm=login(user,password);

    if(confirm==1)
        {

            user_menu(user); //calling the menu from login-scree, with username in it.
        }
    else
        printf("\nPlease try again, the credentials are incorrect.");
        goto ATTEMPT;
}

//Reading or printing account info
void read_account_info(char user[])
{
    printf("\n\n");
    int compare;
    starline();
    printf("\nShowing user info for:");
    puts(user);
    FILE *fp1;
    fp1=fopen("User_Database_01.dat","r");
    while(!feof(fp1))
    {
        fread(&g_info,sizeof(g_info),1,fp1);
        if(strcmp(g_info.username,user))
        {
            printf("\nFirst Name:%s",g_info.f_name);
            printf("\nLast Name:%s",g_info.l_name);
            printf("\nContact Number:%s",g_info.ph_no);
            printf("\nAge:%d",g_info.age);
            printf("\nPIN number:%d",g_info.pin);
            printf("\nUsername:%s",g_info.username);
            printf("\nPassword:%s",g_info.password);
            printf("\nEmail:%s",g_info.email);

        }

    }
}



//Login user and password check
int login(char u[],char p[])
{
    FILE *fp;
    fp=fopen("Confidental.dat","r");

    while(!feof(fp))
    {
        fread(&usr_pswd,sizeof(usr_pswd),1,fp);
        if(!strcmp(u,usr_pswd.username) && !strcmp(p,usr_pswd.password))
        {
            fclose(fp);
            return 1;
        }

    }
    return 0;
}

//main function
int main()
{




    loginscreen();
    /* if(confirm==0)
    {
        printf("\a\n\tAccess Approved.");
        //switch case for menu:
        printf("\n\n");
    }
    else
    {
        //Acces denied
        printf("\a\n\tAccess Denied.");
    }
    */
    printf("\n\n");
    starline();
    return 0;
}