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

#define MIN 8

struct ACCOUNTS {
    char Username[100];
    char Password[100];
    float Balance;
} a[10] = {0};

void logMenu();
void accCreate();
int logIn();

int logIn(){

    char uName[100], uPass[100];
    int i, j;
    bool exists = false;

    while(true) {
        printf("Username: ");
        scanf("%s", uName);

        for (i = 0; i < 10; i++) {
            exists = false;
            if(strcmp(a[i].Username,uName) == 0){
                exists = true;
                j = i;
                break;
            }
        }

        if(exists = true){
            printf("Password: ");
            scanf("%s",uPass);

            if(strcmp(a[i].Password,uPass) == 0){
                printf("Success!");
                return j;
            }

            else{
                printf("Account doesn't exist or the password is wrong! Try again.");
                continue;
            }
        }
    }
}

void accCreate(){
    char username[100], password[100];
    int i;
    bool taken;

    int cCount,sCount,nCount = 0;

    //Username Creation
    while(true){
        printf("Enter a username: ");
        scanf("%s",username);

        for(i = 0;i < 10; i++) {
            taken = false;
            if (strcmp(a[i].Username,username) == 0) {
                taken = true;
                break;
            }
        }

        if(taken == true){
            printf("Username already taken! Please try a different one!\n");
            continue;
        }

        for(i = 0;i < 10; i++) {
            if (a[i].Username != 0){
                continue;
            }

            else{
                strcpy(a[i].Username,username);
                break;
            }
        }
        break;
    }

    //Password creation
    while(true) {

        int j;
        char tempPass[100];

        printf("Enter a password (Must contain at least one uppercase, number, and symbol): ");
        scanf("%s", password);
        printf("Confirm your password: ");
        scanf("%s", tempPass);
        //Pass check
        if (strcmp(password,tempPass) != 0) {
            printf("Passwords do not match!\n");
            continue;
        }

        if (strlen(password) < MIN) {
            printf("Password is too short! Must be at least 8 characters.\n");
            continue;
        }

        for (j = 0; password[j] != '\0'; j++) {
            if (password[j] >= 'a' && password[j] <= 'z')
                continue;

            else if (password[j] >= 'A' && password[j] <= 'Z') {
                cCount++;
                continue;
            } else if (password[j] >= '0' && password[j] <= '9') {
                nCount++;
                continue;
            } else {
                sCount++;
                continue;
            }
        }
        if (cCount >= 1 && nCount >= 1 && sCount >= 1) {
            break;
        } else {
            printf("Password does not meet the specified criteria.\n");
            continue;
        }
    }
    strcpy(a[i].Password,password);
}

void logMenu(){
    while(true) {

        int choice;
        int mCont;

        system("cls");
        printf("1. Log In\n");
        printf("2. Create Account\n");
        printf("3. Exit\n");

        scanf("%d",&choice);

        if(choice == 1){
            logIn();
        }

        else if(choice == 2){
            accCreate();
        }

        else if(choice == 3){
            printf("Under construction.");
        }

        else{
            printf("Invalid option. Please try again.");
        }
    }
}

void main(){

    logMenu();
}