#define _CRT_SECURE_NO_WARNINGS
#define SIZE 50
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include<ctype.h>
#include <time.h>

void printAccounts(struct account* userAccounts, int amountOfAccounts);
int enterPassword(struct account* userAccounts, int i);
int isSafePassword(char password[]);
int passwordIsLongEnough(char password[]);
int passwordContainsDigit(char password[]);
int passwordHasMixedCase(char password[]);

struct account {
    char name[SIZE];
    char password[SIZE];
};


int main(void) {
    int amountOfAccounts;
    struct account* userAccounts;

    printf("How many accounts?: ");
    scanf("%d", &amountOfAccounts);

    userAccounts = (struct account*)malloc(sizeof(struct account)*amountOfAccounts);
    memset(userAccounts, 0, sizeof(struct account)* amountOfAccounts);

    int i = 0;
    while (i < amountOfAccounts) {
        if (strlen(userAccounts[i].name) == 0) {
            printf("Enter a username: ");
            scanf("%s", userAccounts[i].name);
        }
        if (enterPassword(userAccounts, i) == 1)
            i++;
    }

    printAccounts(userAccounts, amountOfAccounts);

    getchar();
    getchar();
    free(userAccounts);
    return 0;
}


void printAccounts(struct account* userAccounts, int amountOfAccounts) {
    printf("\nHere are all users and passwords:\n");
    for (int i = 0; i < amountOfAccounts; i++) {
        printf("%s\t\t", userAccounts[i].name);
        printf("%s\n", userAccounts[i].password);
    }
}


int enterPassword(struct account* userAccounts, int i) {
    char passwordconfirm[SIZE];
    printf("Enter a password: ");
    scanf("%s", userAccounts[i].password);
    if (isSafePassword(userAccounts[i].password) == 1) {
        scanf("%s", passwordconfirm);
        if (strcmp(userAccounts[i].password, passwordconfirm) == 0) {
            printf("Password %s is confirmed\n", userAccounts[i].password);
            return 1;
        }
        else
            printf("This password differs from the one you entered. Password not confirmed.\n");
    }
}


int isSafePassword(char password[]) {
    if (passwordIsLongEnough(password) == 1 && passwordContainsDigit(password) == 1 && passwordHasMixedCase(password) == 1) {
        printf("This is a valid password. Confirm by entering it again: ");
        return 1;
    }
    else {
        if (passwordIsLongEnough(password) != 1)
            printf("The password is too short. Please enter at least 8 characters\n");
        if (passwordContainsDigit(password) != 1)
            printf("The password contains no digits\n");
        if (passwordHasMixedCase(password) != 1)
            printf("The password does not contain mixed case\n");
        return 0;
    }
}


int passwordIsLongEnough(char password[]) {
    if (strlen(password) >= 8)
        return 1;
    else
        return 0;
}


int passwordContainsDigit(char password[]) {
    for (int i = 0; password[i] != '\0'; i++)
        if (isdigit(password[i]))
            return 1;
    return 0;
}


int passwordHasMixedCase(char password[]) {
    for (int i = 0; password[i] != '\0'; i++)
        if (isupper(password[i]))
            for (int i = 0; password[i] != '\0'; i++)
                if (islower(password[i]))
                    return 1;
    return 0;
}