/**
 * @author Pablo
 */
function validateFormOnSubmit(theForm){
    var reason = "";
    
    reason += validateUsername(theForm.username);
    reason += validatePassword(theForm.pwd);
    reason += validateEmail(theForm.email);
    reason += validatePhone(theForm.phone);
    reason += validateEmpty(theForm.from);
    
    if (reason != "") {
        alert("Some fields need correction:\n" + reason);
        return false;
    }
    
    alert("All fields are filled correctly");
    return false;
}

function validateContactForm(theForm){
    var reason = "";
    
    reason += validateEmpty(theForm.name);
    reason += validateEmail(theForm.email);
    reason += validateEmpty(theForm.message);
    
    if (reason != "") {
        alert("Some fields need correction:\n" + reason);
        return false;
    }
    
    /*alert("All fields are filled correctly");*/
    return true;
}

function validateOrderForm(theForm){
    var reason = "";
    
    reason += validateEmpty(theForm.customer_full_name);
    reason += validateEmail(theForm.customer_email);
    reason += validateEmpty(theForm.customer_country);
	
	reason += validateEmpty(theForm.payment_detail_card_number);
	reason += validateEmpty(theForm.payment_detail_expiration_date);
    
    if (reason != "") {
        alert("Some fields need correction:\n" + reason);
        return false;
    }
    
    /*alert("All fields are filled correctly");*/
    return true;
}

function validateEmpty(fld){
    var error = "";
    
    if (fld.value.length == 0) {
        fld.style.background = 'Yellow';
        error = "The required field has not been filled in.\n"
    }
    else {
        fld.style.background = 'White';
    }
    return error;
}

function validateUsername(fld){
    var error = "";
    var illegalChars = /\W/; // allow letters, numbers, and underscores
    if (fld.value == "") {
        fld.style.background = 'Yellow';
        error = "You didn't enter a username.\n";
    }
    else 
        if ((fld.value.length < 5) || (fld.value.length > 15)) {
            fld.style.background = 'Yellow';
            error = "The username is the wrong length.\n";
        }
        else 
            if (illegalChars.test(fld.value)) {
                fld.style.background = 'Yellow';
                error = "The username contains illegal characters.\n";
            }
            else {
                fld.style.background = 'White';
            }
    return error;
}

function validatePassword(fld){
    var error = "";
    var illegalChars = /[\W_]/; // allow only letters and numbers 
    if (fld.value == "") {
        fld.style.background = 'Yellow';
        error = "You didn't enter a password.\n";
    }
    else 
        if ((fld.value.length < 7) || (fld.value.length > 15)) {
            error = "The password is the wrong length. \n";
            fld.style.background = 'Yellow';
        }
        else 
            if (illegalChars.test(fld.value)) {
                error = "The password contains illegal characters.\n";
                fld.style.background = 'Yellow';
            }
            else 
                if (!((fld.value.search(/(a-z)+/)) && (fld.value.search(/(0-9)+/)))) {
                    error = "The password must contain at least one numeral.\n";
                    fld.style.background = 'Yellow';
                }
                else {
                    fld.style.background = 'White';
                }
    return error;
}

function trim(s){
    return s.replace(/^\s+|\s+$/, '');
}

function validateEmail(fld){
    var error = "";
    var tfld = trim(fld.value); // value of field with whitespace trimmed off
    var emailFilter = /^[^@]+@[^@.]+\.[^@]*\w\w$/;
    var illegalChars = /[\(\)\<\>\,\;\:\\\"\[\]]/;
    
    if (fld.value == "") {
        fld.style.background = 'Yellow';
        error = "You didn't enter an email address.\n";
    }
    else 
        if (!emailFilter.test(tfld)) { //test email for illegal characters
            fld.style.background = 'Yellow';
            error = "Please enter a valid email address.\n";
        }
        else 
            if (fld.value.match(illegalChars)) {
                fld.style.background = 'Yellow';
                error = "The email address contains illegal characters.\n";
            }
            else {
                fld.style.background = 'White';
            }
    return error;
}

function validatePhone(fld){
    var error = "";
    var stripped = fld.value.replace(/[\(\)\.\-\ ]/g, '');
    
    if (fld.value == "") {
        error = "You didn't enter a phone number.\n";
        fld.style.background = 'Yellow';
    }
    else 
        if (isNaN(parseInt(stripped))) {
            error = "The phone number contains illegal characters.\n";
            fld.style.background = 'Yellow';
        }
        else 
            if (!(stripped.length == 10)) {
                error = "The phone number is the wrong length. Make sure you included an area code.\n";
                fld.style.background = 'Yellow';
            }
    return error;
}