// QUIZ

// INSTRUCTIONS
// ensure you have two hidden fields labeled 'quiz' and 'correct', they can be placed anywhere in the form
// in each quiz question check 'enable values' and set the value of the correct answer to 1, others set to 0. don't use other point systems

// processes a quiz and total up the correct answers
function sb_quiz_process($form){
    if ( ! sb_is_quiz( $form ) ) return;

    $total_value = 0; $questions_num = 0;
    foreach($form['fields'] as $field){
        //if ( strtolower($field['label']) == 'quiz') $is_quiz = true;
        if ( strtolower($field['label']) == 'correct') $total_field_id = $field['id'];
        $value = $_POST['input_' . $field['id']];
        if ( $value === '1' || $value === '0' ) {
            $total_value = $total_value + $value;
            $questions_num++;
        }
    }
    if ( $total_field_id && $questions_num ) {
        $percent_correct = $total_value / $questions_num; // assuming each correct value is 1 and not more!
        $_POST['input_' . $total_field_id] = sprintf("%.2f", $percent_correct );
    }
}
add_action("gform_pre_submission", "sb_quiz_process");


//create our own confirmation
function sb_quiz_submission( $lead, $form ) {

    if ( ! sb_is_quiz( $form ) ) return;

    //echo GFCommon::get_submitted_fields($form, $lead, false, true);
    echo '<div id="gforms_confirmation_message">';
    echo '<p>Thanks for taking the quiz! Your results are stored and you can always check your status to see what quizzes you have finished and which still need to be done.</p>';

    foreach($form["fields"] as $field){
        $field_label = esc_html(GFCommon::get_label($field));
        if ( strtolower($field['label']) == 'quiz') continue;
        $field_value = RGFormsModel::get_lead_field_value($lead, $field);
        $field_value_display = GFCommon::get_lead_field_display($field, $field_value, false, true);

        if ( strtolower($field['label']) == 'correct' )  {
             echo "<p class='sb_quiz_total'><strong>Your Score: ". $field_value * 100 ."%</strong>";
             unset($_POST['input_'.$field['id']]);
        } elseif ( is_numeric($field_value) ) {
            echo "<p class='sb_quiz_result' style='text-align:left;margin-left: 20px; '><strong>$field_label</strong><br>";
            if ( $field_value === '1' ){
                echo "<span style='color:green'>CORRECT - $field_value_display</span>";
            } else {
                echo "<span style='color:red'>INCORRECT - try again</span>";
                unset($_POST['input_'.$field['id']]);
            }
            echo "</p>";
        }
    }

    echo '</div>';
}
add_action( 'gform_post_submission', 'sb_quiz_submission', 10, 2 );



//disable default confirmation
function sb_quiz_confirmation( $confirmation, $form, $lead, $ajax ) {
    if ( sb_is_quiz( $form ) )
        return '';
    else
        return $confirmation;
}
add_filter( 'gform_confirmation', 'sb_quiz_confirmation', 10, 4 );


// is this form a quiz?
function sb_is_quiz( $form ) {
    foreach($form['fields'] as $field){
        if ( strtolower($field['label'] ) == 'quiz' )
            $is_quiz = true;
    }
    return $is_quiz;
}