<?php
/*
* Form class by Jonas Delfs
*
* Feel free to use and be inspired, but do not
* redistribute under another name than mine
*
* @version 0.9.1
*/

class Form {
    
    var $formAttr = array();
    var $tabOffset = 0;
    var $tableAttr = array();
    var $elements = array();
    var $values = array();
    var $submitVars = array();
    var $errors = array();
    var $reservedKeys = array('label', 'element', 'validate', 'errmsg', 'elements');
    var $stdErrMsg = "Field is required.";
    var $stdErrMsgUnequal = "Field must be equal to the other.";
    var $showRequired = true;
    var $matches = array('number' => array('regex' => '/^\d+$/', 'errmsg' => 'Field must be a number.'),
                         'float' => array('regex' => '/^[0-9]+\.[0-9]+$/', 'errmsg' => 'Field must be a float.'),
                         'letters' => array('regex' => '/^[a-zæøå]+$/i', 'errmsg' => 'Field must be letters'),
                         'word' => array('regex' => '/^\w+$/i', 'errmsg' => 'Field must be word characters.'),
                         'words' => array('regex' => '/^[\w\s]+$/i', 'errmsg' => 'Field must be word characters and space.'),
                         'email' => array('regex' => '/^([\w|\.|\-|_]+)@([\w||\-|_]+)\.([\w|\.|\-|_]+)$/i', 'errmsg' => 'Field must be a valid email-adress'));
    
    function Form($formAttr=NULL, $tabOffset=0, $tableAttr=NULL, $elements=NULL)
    {
        $this->formAttr = (array)$formAttr;
        $this->tabOffset = (int)$tabOffset;
        $this->tableAttr = (array)$tableAttr;
        $this->submitVars = (array)array_merge($_GET, $_POST);
        $this->elements = (array)$elements;
        
        if (!isset($this->formAttr['name'])) {
            if ($this->submitVars['__FORMID__']) {
                $this->formAttr['name'] = $this->submitVars['__FORMID__'];
            } else {
                mt_srand ((double)microtime() * 1000000);
                $this->formAttr['name'] = md5(crypt(mt_rand(1, mt_getrandmax())));
            }
        }
    }
    
    function reset() {
        $this->submitVars = array();
    }
    
    function _getAttrString($attributes)
    {
        $strAttr = '';
        if (is_array($attributes)) {
            foreach($attributes AS $key => $value) {
                if (is_int($key)) {
                    $strAttr .= ' '.strtolower($value).'="'.$value.'"';
                } else {
                    $strAttr .= ' '.strtolower($key).'="'.$value.'"';
                }
            }
        }
        return $strAttr;
    }
    
    function _getIndent()
    {
        return $this->tabOffset > 0 ? str_repeat("\t", $this->tabOffset) : '';
    }
    
    function _insertVars(&$vars)
    {
        $checked = array();
        for($i=0; $i < count($this->elements); $i++) {
            if (is_array($this->elements[$i]['elements'])) {
                for($index=0; $index < count($this->elements[$i]['elements']); $index++) {
                    $this->_insertVar($vars, $this->elements[$i]['elements'][$index], $checked);
                }
            } else {
                $this->_insertVar($vars, $this->elements[$i], $checked);
            }
        }
    }
    
    function _insertVar(&$vars, &$element, &$checked)
    {
        if ($element['type'] == 'radio') {
            if ($vars[$element['name']] == $element['value']) {
                $element['checked'] = 'checked';
                $checked[$element['name']] = true;
            } else {
                for($index=0; $index < count($element); $index++) {
                    if ($element[$index] == 'checked') {
                        unset($element[$index]);
                    }
                }
            }
        } elseif ($element['type'] == 'select') {
            foreach($element['value'] AS $key => $val) {
                //echo "'".$val."': '".$vars[$element['name']]."'<br/>\n";
                //echo "'".$val['value']."': '".$vars[$element['name']]."'<br/>\n";
                if (($val == $vars[$element['name']]
                        || (is_array($val) && $val['value'] == $vars[$element['name']])
                        || (is_string($val)
                            && is_array($vars[$element['name']])
                            && in_array($val, $vars[$element['name']]))
                        || (is_string($val['value'])
                            && is_array($vars[$element['name']])
                            && in_array($val['value'], $vars[$element['name']])))
                    && ((is_array($element['value'][$key])
                        && !in_array('selected', $element['value'][$key]))
                        || (is_string($element['value'][$key])
                        && $element['value'][$key] != 'selected'))) {
                    
                    if (is_array($element['value'][$key])) {
                        $element['value'][$key]['selected'] = 'selected';
                    } else {
                        //echo "'".$element['value'][$key]."'";
                        $element['value'][$key] = array('value' => $element['value'][$key], 'selected' => 'selected');
                    }
                } else {
                    if (is_array($element['value'][$key])) {
                        foreach($element['value'][$key] AS $index => $_) {
                            if ($element['value'][$key][$index] == 'selected') {
                                unset($element['value'][$key][$index]);
                            }
                        }
                    }
                }
            }
        } elseif (substr($element['name'], -2) == '[]') {
            if (!$arrayFields[$element['name']]) {
                $arrayFields[$element['name']] = 0;
            }
            if (is_array($vars[substr($element['name'], 0, -2)])) {
                $element['value'] = $vars[substr($element['name'], 0, -2)][$arrayFields[$element['name']]];
            }
            $arrayFields[$element['name']]++;
        } else {
            if ($vars[$element['name']]) {
                $element['value'] = $vars[$element['name']];
            }
        }
    }
    
    function insertValue($mixed, $value=NULL)
    {
        if (!is_array($mixed)) {
            $mixed = array($mixed => $value);
        }
        //$this->values = array_merge($this->values, $mixed);
        $this->_insertVars($mixed);
    }
    
    function getSubmitted($name=NULL)
    {
        if ($name) {
            return $this->submitVars[$name];
        } elseif (gettype($name) != NULL) {
            return false;
        }
        return $this->submitVars;
    }
    
    function isSubmitted()
    {
        if ($this->submitVars['__FORMID__'] == $this->formAttr['name']) {
            return true;
        }
        return false;
    }
    
    function addElement($mixed, $type=NULL, $name=NULL, $value=NULL, $attr=NULL, $validate=NULL, $errmsg=NULL)
    {
        $this->elements[] = $this->getElement($mixed, $type, $name, $value, $attr, $validate, $errmsg);
    }
    
    function addElementGroup($mixed, $elements)
    {
        $this->elements[] = $this->getElementGroup($mixed, $elements);
    }
    
    function getElement($mixed, $type=NULL, $name=NULL, $value=NULL, $attr=NULL, $validate=NULL, $errmsg=NULL)
    {
        if (!is_array($mixed)) {
            $mixed = array('label' => $mixed, 'type' => $type, 'name' => $name, 'value' => $value, 'validate' => $validate, 'errmsg' => $errmsg);
            $mixed = array_merge($attr, $mixed);
            if ($mixed['validate'] && !$mixed['errmsg']) {
                for($i=0; $i < count($this->matches); $i++) {
                    if ($mixed['validate'] == $this->matches[$i]['regex']) {
                        $mixed['errmsg'] = $this->matches[$i]['errmsg'];
                    }
                }
            }
            if ($mixed['validate'] && !$mixed['errmsg']) {
                $mixed['errmsg'] = $this->stdErrMsg;
            }
        }
        return $mixed;
    }
    
    function getElementGroup($mixed, $elements)
    {
        if (!is_array($mixed)) {
            $mixed = array('label' => $mixed, 'elements' => $elements);
        }
        $mixed['type'] = 'group';
        return $mixed;
    }
    
    function buildElement($mixed, $name=NULL, $value=NULL, $attr=NULL)
    {
        if (!is_array($mixed)) {
            $attributes = array('type' => $mixed, 'name' => $name, 'value' => $value);
            $mixed = array_merge($attr, $attributes);
        }
        if (isset($mixed['element'])) {
            return $mixed['element'];
        }
        foreach($mixed AS $key => $val) {
            if (in_array((string)$key, $this->reservedKeys)) {
                unset($mixed[$key]);
            }
        }
        $indent = $this->_getIndent();
        switch($mixed['type']) {
            
            case 'select':
                $options = $mixed['value'];
                unset($mixed['value']);
                $strHtml  = "<select".$this->_getAttrString($mixed).">\n";
                foreach($options AS $k => $v) {
                    $strHtml .= $indent."            <option";
                    if (is_array($v)) {
                        $strHtml .= $this->_getAttrString($v);
                    } else {
                        $strHtml .= " value=\"".$v."\"";
                    }
                    $strHtml .= ">";
                    $strHtml .= is_string($k) ? $k : (is_string($v) ? $v : $v['value']);
                    $strHtml .= "</option>\n";
                }
                $strHtml .= $indent."        </select>";
                break;
                
            case 'textarea':
                $value = $mixed['value'];
                unset($mixed['value']);
                $strHtml = "<textarea".$this->_getAttrString($mixed).">".$value."</textarea>";
                break;
                
            default:
                if (!isset($mixed['value'])) {
                    unset($mixed['value']);
                }
                $strHtml = "<input".$this->_getAttrString($mixed).">";
                break;        
        }
        
        return $strHtml;
    }
    
    function buildElementGroup($element)
    {
        $indent = $this->_getIndent();
        $strHtml = '';
        for($i=0; $i < count($element); $i++) {
            if ($placeBefore) {
                $strHtml .= ' '.$element[$i]['label'].' ';
            }
            /*if ($element[$i]['type'] == 'radio'
                && $element[$i]['value'] == $this->values[$element[$i]['name']]) {
                $element[$i]['checked'] = 'checked';
            }*/
            $strHtml .= $this->buildElement($element[$i])."\n";
            if (!$placeBefore) {
                $strHtml .= ' '.$element[$i]['label'].' ';
            }
            $strHtml .= $indent."\t\t";
        }
        return $strHtml;
    }
    
    function _getErrmsg($element)
    {
        if ($element['errmsg']) {
            $errmsg = $element['errmsg'];
        } elseif ($this->matches[$element['validate']]['errmsg']) {
            $errmsg = $this->matches[$element['validate']]['errmsg'];
        } elseif ($this->getSubmitted($element['validate'])) {
            $errmsg = $this->stdErrMsgUnequal;
        } else {
            $errmsg = $this->stdErrMsg;
        }
        return $errmsg;
    }
    
    function _setInsertedValue(&$element)
    {
        if (isset($this->values[$element['name']])
            && $element['type'] != 'radio'
            && $element['type'] != 'select') {
            
            $element['value'] = $this->values[$element['name']];
        }
    }
    
    function toHtml()
    {
        /*for($i=0; $i < count($this->elements); $i++) {
            if (is_array($this->elements[$i]['elements'])) {
                for($index=0; $index < count($this->elements[$i]['elements']); $index++) {
                    $this->_setInsertedValue($this->elements[$i][$index]);
                }
            } else {
                $this->_setInsertedValue($this->elements[$i]);
            }
        }*/
        if ($this->isSubmitted()) {
            $this->_insertVars($this->submitVars);
        }
        $indent = $this->_getIndent();
        $strHtml  = $indent."<form".$this->_getAttrString($this->formAttr).">\n";
        $strHtml .= $indent.$this->buildElement('hidden', '__FORMID__', $this->formAttr['name'])."\n";
        $strHtml .= $indent."<table".$this->_getAttrString($this->tableAttr).">\n";
        foreach($this->elements AS $element) {
            if ($element['type'] == 'hidden') {
                $strHtml .= $indent.$this->buildElement($element);
            } else {
                $strHtml .= $indent."    <tr>\n";
                if ($this->showRequired) {
                    $strHtml .= $indent."        <td valign=\"top\">";
                    if (isset($element['validate'])) {
                        $strHtml .= "*";
                    }
                    $strHtml .= "</td>\n";
                }
                $strHtml .= $indent."        <td";
                if ($element['type'] == 'textarea'
                    || ($element['type'] == 'select' && ($element['size'] > 1 || in_array('multiple', $element)))
                    || $this->errors[$element['name']]) {
                    
                    $strHtml .= " valign=\"top\"";
                }
                $strHtml .= ">".$element['label']."</td>\n";
                $strHtml .= $indent."        <td>";
                if ($element['type'] == 'group') {
                    $strHtml .= $this->buildElementGroup($element['elements']);
                } else {
                    $strHtml .= $this->buildElement($element);
                }
                if ($this->errors[$element['name']]) {
                    $strHtml .= "<br/>\n";
                    $strHtml .= $indent."\t\t\t<span style='color:#FF0000;'>".$this->errors[$element['name']]."</span>";
                }
                $strHtml .= "</td>\n";
                $strHtml .= $indent."    </tr>\n";
            }
        }
        $strHtml .= $indent."</table>\n";
        $strHtml .= $indent."</form>";
        
        return $strHtml;
    }
    
    function display()
    {
        echo $this->toHtml();
    }
    
    function validate()
    {
        if (!$this->isSubmitted()) {
            return false;
        }
        $return = 1;
        foreach($this->elements AS $element) {
            if (is_array($element['elements'])) {
                foreach($element['elements'] AS $element) {
                    $this->_validateElement($element, $return);
                }
            } else {
                $this->_validateElement($element, $return);
            }
        }
        return ($return < 1 ? false : true);
    }
    
    function _validateElement($element, &$return)
    {
        if ((substr($element['validate'], 0, 1) == '/'
                && !preg_match($element['validate'], $this->getSubmitted($element['name'])))
            || ($element['validate'] == 'required'
                && !$this->getSubmitted($element['name']))
            || ($this->matches[$element['validate']]
                && !preg_match($this->matches[$element['validate']]['regex'], $this->getSubmitted($element['name'])))
            || ($this->getSubmitted($element['name'])
                && $this->getSubmitted($element['validate'])
                && $this->getSubmitted($element['name']) != $this->getSubmitted($element['validate']))) {
            $return--;
            $this->errors[$element['name']] = $this->_getErrmsg($element);
        }
    }
    
    function getJs() {
        $name = $this->formAttr['name'];
        
        $this->formAttr['onsubmit'] = "return eval".$name."();";
        
        $indent = $this->_getIndent();
        
        $js  = $indent."<SCRIPT LANGUAGE='JavaScript' TYPE='text/javascript'>\n";
        $js .= $indent."<!--\n";
        
        $js .= $indent."function eval".$name."() {\n";
        $js .= $indent."    \n";
        $js .= $indent."    var thisForm = document.forms['".$name."'];\n";
        
        $js .= $indent."    var requiredFields = new Array(";
        for($i=0; $i < count($this->elements); $i++) {
            if (isset($this->elements[$i]['validate'])) {
                if ($count) {
                    $js .= ", ";
                }
                $js .= "\n".$indent."        new Array(\"".$this->elements[$i]['name']."\", \"".$this->elements[$i]['label']."\", \"".$this->_getErrmsg($this->elements[$i])."\")";
                $count++;
            }
        }
        $js .= $indent."        );\n";
        $js .= $indent."    for (var i = 0; i < requiredFields.length; i++) {\n";
        $js .= $indent."        if (thisForm.elements[requiredFields[i][0]].value == \"\") {\n";
        $js .= $indent."            alert(requiredFields[i][1] + \": \" + requiredFields[i][2])\n";
        $js .= $indent."            thisForm.elements[requiredFields[i][0]].focus();\n";
        $js .= $indent."            return false;\n";
        $js .= $indent."        }\n";
        $js .= $indent."    }\n";
        $js .= $indent."}\n";
        $js .= $indent."//-->\n";
        $js .= $indent."</SCRIPT>\n";
    
        return $js;
    }
    
    function isValid($mixed, $required)
    {
        if (is_string($mixed)) {
            $mixed = $GLOBALS['HTTP_'.strtoupper($mixed).'_VARS'];
        }
        foreach($required AS $field) {
            if (!isset($mixed[$field])) {
                return false;
            }
        }
        return true;
    }
}
?>