#include <iostream>
#include <unistd.h>
#include <string.h>
using namespace std;

bool checkChars(char arg[])
{
    for(unsigned int i = 0; i < strlen(arg); i++)
        if(!strchr("1234567890qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM", arg[i]))
            return false;
    return true;
}

bool isOkUser(char arg[])
{
    if(checkChars(arg) == false)
        return false;
    return true;
}

bool isOkPass(char arg[])
{
    if(strlen(arg) < 3)
    {
        cout<<"Password is to short!";
        return false;
    }
    else
    {
        char aux[250];
        strcpy(aux, arg);
        for(int unsigned i = 0; i < strlen(aux); i++)
            aux[i] = tolower(aux[i]);
        if(strcmp(aux, arg) == 0)
        {
            cout<<"Password is insecure!";
            return false;
        }
    }
    return true;
}

bool isOkEmail(char arg[])
{
    bool isAt = false, isDot = false;
    char leftAux[250], rightAux[250], aux[250];

    for (int unsigned i = 0; i < strlen(arg); i++)
        if(arg[i] == '@')
            isAt = true;
        else
        {
            leftAux[i] = arg[i];
            leftAux[i+1] = '\0';
        }
    if(isAt == false || strlen(leftAux) < 1 || checkChars(leftAux) == false)
        return false;

    strcpy(rightAux, strstr(arg, "@"));
    strcpy(rightAux, rightAux + 1);

    strcpy(aux, rightAux);
    leftAux[0] = rightAux[0] = '\0';
    for(int unsigned i = 0; i < strlen(aux); i++)
        if(aux[i] == '.')
            isDot = true ;
        else
        {
            leftAux[i] = aux[i];
            leftAux[i+1] = '\0';
        }
    if(isDot == false || strlen(leftAux) < 1 || checkChars(leftAux) == false)
        return false;

    strcpy(rightAux, strstr(aux, "."));
    strcpy(rightAux, rightAux + 1);
    if(strlen(rightAux) < 2 || checkChars(rightAux) == false)
        return false;
    return true;
}

int main(int argc, char *argv[])
{
    int option;
    string user, password, email;
    bool u = false, p = false, e = false;

    while ((option = getopt (argc, argv, "u:p:e:")) != -1)
        switch (option)
        {
        case 'u':
            if(isOkUser(optarg) == false)
            {
                cout<<"Username is not valid!";
                return 1;
            }
            user = optarg;
            u = true;
            break;
        case 'p':
            if(isOkPass(optarg) == false)
                return 1;
            password = optarg;
            p = true;
            break;
        case 'e':
            if(isOkEmail(optarg) == false)
            {
                cout<<"E-mail is not valid!";
                return 1;
            }
            email = optarg;
            e = true;
            break;
        }
    if(u == false)
    {
        cout<<"Argument -u is mandatory";
        return 1;
    }
    if(e == true && p == true)
        cout<<"User "<<user<<" has the email "<<email<<" and the password "<<password;
    else if(p == false)
        cout<<"User "<<user<<" has email "<<email;
    return 0;
}