#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>
#include <math.h>
#include <string.h>


int main()
{
    FILE * user;
    char choice;
    char * username;
    char * password1;
    char * password2;
    int i;
    int j;
    bool digit, upper, lower;

    username = (char *) malloc( 25 * sizeof(int) );
    password1 = (char *) malloc( 25 * sizeof(int) );
    password2 = (char *) malloc( 25 * sizeof(int) );

    printf("Do you have an account? <y/n>\n");
    scanf(" %c", &choice);

    if(choice == 'n'){

        puts("\nWell its time to make one ...\n");
        puts("Enter your username dude :");
        scanf(" %s",username);
        strcat(username, ".txt");
        while(1){
            while(1){
                puts("Enter your password and try to make it strong (use upper case and lower case letters and numbers) ");
                scanf(" %s",password1);
                for(i = 0; i < strlen(password1); i++){
                    if( isdigit(password1[i]) ){
                            digit = true;
                    }else if( isalpha(password1[i]) ){

                        if( isupper(password1[i]) ){
                            upper = true;
                        }else{
                            lower = true;
                        }

                    }
                }

                if(digit==true && upper==true && lower==true){
                    break;
                }
                printf("Are you deaf? I said a strong password!!!\n");
            }
            puts("Reenter the pasword :");
            scanf(" %s", password2);

            j=0;
            for(i=0; i<strlen(password1); i++){
                if(password1[i] == password2[i]){
                    j++;
                }
            }
            if(strlen(password1) == strlen(password2) && i == j){
                    break;
                    }
            puts("That isn't your password...");
        }
        user = fopen(username, "w");;
        fprintf(user, "%s", password1);
    }else{
        while(1){
            puts("Then enter your username : ");
            scanf(" %s", username);
            strcat(username, ".txt");
            user = fopen(username, "r");

            while(!feof(user)){
                fgets(password2, 25, user);
            }

            puts("Enter your password : ");
            scanf(" %s", password1);

            j=0;
            for(i=0; i<strlen(password1); i++){
                if(password1[i] == password2[i]){
                    j++;
                }
            }
            if(strlen(password1) == strlen(password2) && i == j){
                    puts("Well your in ... What do you want to do, because there is nothing to do... :(");
                    }else{
                        puts("It seems that you don't have an account, or maybe you entered your username/password incorrectly.");
                        puts("Please try again.");
                    }
            }
    }

    fclose(user);
    free(username);
    free(password1);
    free(password2);

    return 0;
}