/****************************************************************************\
     Creation date :-> 27-06-2006 [dd-mm-yyyy]
     Last update   :-> 27-03-2011 [dd-mm-yyyy]
 \****************************************************************************/

var my_form       = "";
var submitted     = false;
var error         = false;
var error_message = "";

function check_input(field_name, field_size, message) {
    if(my_form.elements[field_name] && (my_form.elements[field_name].type != "hidden")) {
        var field_value = my_form.elements[field_name].value;
        if(field_value == '' || field_value.length < field_size) {
            error_message = error_message + "* " + message + "\n";
            error = true;
        }
    }
}

function check_radio(field_name, message) {
    var isChecked = false;
    if(my_form.elements[field_name] && (my_form.elements[field_name].type != "hidden")) {
        var radio = my_form.elements[field_name];

        for (var i=0; i<radio.length; i++) {
            if (radio[i].checked == true) {
                isChecked = true;
                break;
            }
        }

        if(isChecked == false) {
            error_message = error_message + "* " + message + "\n";
            error = true;
        }
    }
}

function check_checkbox(field_name, message) {
    if(my_form.elements[field_name] && (my_form.elements[field_name].type != "hidden")) {
        var radio = my_form.elements[field_name];

        if(radio.checked == false) {
            error_message = error_message + "* " + message + "\n";
            error = true;
        }
    }
}

function check_select(field_name, field_default, message) {
    if(my_form.elements[field_name] && (my_form.elements[field_name].type != "hidden")) {
        var field_value = my_form.elements[field_name].value;

        if(field_value == field_default) {
            error_message = error_message + "* " + message + "\n";
            error = true;
        }
    }
}

function check_password(field_name_1, field_name_2, field_size, message_1, message_2) {
    if(my_form.elements[field_name_1] && (my_form.elements[field_name_1].type != "hidden")) {
        var password = my_form.elements[field_name_1].value;
        var confirmation = my_form.elements[field_name_2].value;

        if(password == '' || password.length < field_size) {
            error_message = error_message + "* " + message_1 + "\n";
            error = true;
        } else if(password != confirmation) {
            error_message = error_message + "* " + message_2 + "\n";
            error = true;
        }
    }
}

function check_password_new(field_name_1, field_name_2, field_name_3, field_size, message_1, message_2, message_3) {
    if(my_form.elements[field_name_1] && (my_form.elements[field_name_1].type != "hidden")) {
        var password_current = my_form.elements[field_name_1].value;
        var password_new = my_form.elements[field_name_2].value;
        var password_confirmation = my_form.elements[field_name_3].value;

        if(password_current == '' || password_current.length < field_size) {
            error_message = error_message + "* " + message_1 + "\n";
            error = true;
        } else if(password_new == '' || password_new.length < field_size) {
            error_message = error_message + "* " + message_2 + "\n";
            error = true;
        } else if(password_new != password_confirmation) {
            error_message = error_message + "* " + message_3 + "\n";
            error = true;
        }
    }
}

function check_form(form_name) {
    if(submitted == true) {
        alert("This form has already been submitted. Please press Ok and wait for this process to be completed.");
        return false;
    }

    error = false;
    my_form = form_name;
    var my_action = my_form.elements['_action_'].value;
    error_message = "Errors have occured during the process of your form.\n\nPlease make the following corrections:\n\n";

    // Sign Up Form OR Update Personal Data Form OR Members Admin -> Edit
    if(my_action == 'sign_up' || my_action == 'update_personal_data' || my_action == 'user_edit' || my_action == 'user_activate') {
        if(my_action == 'user_activate') {
            check_input("password", 5, "Password must contain a minimum of 5 characters.");
        }
        
        if(my_action == 'update_personal_data') {
            check_input("username", 4, "Username must contain a minimum of 4 characters.");
        }
        
        check_input("lastname", 2, "Your Last Name must contain a minimum of 2 characters.");
        check_input("firstname", 2, "Your First Name must contain a minimum of 2 characters.");
        check_input("title", 2, "Your Title must contain a minimum of 2 characters.");
        check_radio("gender", "Please select your Gender.");

        check_input("email", 6, "Your E-Mail Address must contain a minimum of 6 characters.");
        check_input("address", 5, "Your Street Address must contain a minimum of 5 characters.");
        check_input("town", 3, "Your Town must contain a minimum of 3 characters.");
        check_input("postcode", 4, "Your Post Code must contain a minimum of 4 characters.");
        check_select("country", "", "Please select a country from the Countries pull down menu.");
        
        if(my_action == 'sign_up') {
            check_checkbox("user_terms", "Please read and accept our Terms and Conditions.");
        }
    }

    // Change Password Form
    else if(my_action == 'change_password') {
        check_password_new("old_password", "new_password", "new_password_verify", 5, "Your Password must contain a minimum of 5 characters.", "Your new Password must contain a minimum of 5 characters.", "The Password Confirmation must match your new Password.");
    }

    // Admin: Link
    else if(my_action == 'link_add' || my_action == 'link_edit') {
        check_select("link_topic", "", "Please select a topic from the Topic pull down menu.");
        check_input("link_title", 2, "Link title must contain a minimum of 2 characters.");
        check_input("link_url", 10, "Link url must contain a minimum of 10 characters.");
    }
    
    // Admin: News
    else if(my_action == 'news_edit' || my_action == 'news_add') {
        check_input("news_title", 2, "News title must contain a minimum of 2 characters.");
        //check_input("news_url", 10, "News url must contain a minimum of 10 characters.");
        check_input("news_text", 5, "News text must contain a minimum of 5 characters.");
    }
    
    // My Documents: Add
    else if(my_action == 'my_document_add') {
        check_input("document_title", 2, "Document title must contain a minimum of 2 characters.");
        check_input("document_file", 2, "Please select a document.");
    }
    
    // Admin: Edit Document; My Documents
    else if(my_action == 'document_edit' || my_action == 'my_document_edit') {
        check_input("document_title", 2, "Document title must contain a minimum of 2 characters.");
    }
    
    // Admin: Publication
    else if(my_action == 'publication_add' || my_action == 'publication_edit') {
        check_select("publication_type", "", "Please select a type from the Type pull down menu.");
        check_input("publication_title", 2, "Publication title must contain a minimum of 2 characters.");
        check_input("publication_authors", 2, "Publication authors must contain a minimum of 2 characters.");
        //check_input("publication_description", 5, "Publication description must contain a minimum of 5 characters.");
    }
    
    // SIGs Administration: Add Member
    else if(my_action == 'sig_member_add') {
        check_input("member", "", "Please select a new SIG member from the Member pull down menu.");
    }
    
    // Events
    else if(my_action == 'event_add' || my_action == 'event_edit') {
        check_select("event_type", "", "Please select a type from the Type pull down menu.");
        check_input("event_title", 2, "Event title must contain a minimum of 2 characters.");
        check_select("event_country", "", "Please select a country from the Countries pull down menu.");
    }

    // Private Messages
    else if(my_action == 'send_message') {
        if(getCheckedValue(document.Messages.elements['to']) == '4') {
            check_select("member", "", "Please select a recipient.");
        }
        if(getCheckedValue(document.Messages.elements['to']) == '6') {
            check_select("SIG", "", "Please select a SIG.");
        }
        check_input("subject", 2, "Message subject must contain a minimum of 2 characters.");
        check_input("message_body", 5, "Message body must contain a minimum of 5 characters.");
    }
    
    // Newsletter
    else if(my_action == 'newsletter') {
        if(getCheckedValue(document.Messages.elements['to']) == '4') {
            check_select("member", "", "Please select a recipient.");
        }
        if(getCheckedValue(document.Messages.elements['to']) == '6') {
            check_select("SIG", "", "Please select a SIG.");
        }
        check_input("subject", 2, "Message subject must contain a minimum of 2 characters.");
        check_input("message_body", 5, "Message body must contain a minimum of 5 characters.");
    }
    
    // renewal
    else if(my_action == 'user_renewal') {
        $('fee').value = parseInt($('membership_fee').innerHTML);
    }
    
    if(error == true) {
        alert(error_message);
        return false;
    } else {
        submitted = true;
        return true;
    }
}

function getCheckedValue(radioObj) {
    if(!radioObj)
        return "0";
    var radioLength = radioObj.length;
    if(radioLength == undefined)
        if(radioObj.checked)
            return radioObj.value;
        else
            return "0";
    for(var i = 0; i < radioLength; i++) {
        if(radioObj[i].checked) {
            return radioObj[i].value;
        }
    }
    return "0";
}