class.forms.php

                Form::emitMedia($url, $type);
        }
    }

    function getAttachments($config=false) {
        if (!$config)
            $config = $this->field->getConfiguration();

        $field = new FileUploadField(array(
            'id'=>'attach',
            'name'=>'attach:' . $this->field->get('id'),
            'configuration'=>$config)
        );
        $field->setForm($this->field->getForm());
        return $field;
    }
}

class FileUploadWidget extends Widget {
    static $media = array(
        'css' => array(
            '/css/filedrop.css',
        ),
    );

    function render($options) {
        $config = $this->field->getConfiguration();
        $name = $this->field->getFormName();
        $id = substr(md5(spl_object_hash($this)), 10);
        $attachments = $this->field->getFiles();
        $mimetypes = array_filter($config['__mimetypes'],
            function($t) { return strpos($t, '/') !== false; }
        );
        $files = array();
        foreach ($this->value ?: array() as $fid) {
            $found = false;
            foreach ($attachments as $f) {
                $file = $f->file;
                $files[] = array(
                    'id' => $file->getId(),
                    'name' => $file->getName(),
                    'type' => $file->getType(),
                    'size' => $file->getSize(),
                    'download_url' => $file->getDownloadUrl(),
                );
            }
        }
        ?><div id="<?php echo $id;
            ?>" class="filedrop"><div class="files"></div>
            <div class="dropzone"><i class="icon-upload"></i>
            <?php echo sprintf(
                __('Drop files here or %s choose them %s'),
                '<a href="#" class="manual">', '</a>'); ?>
        <input type="file" multiple="multiple"
            id="file-<?php echo $id; ?>" style="display:none;"
            accept="<?php echo implode(',', $config['__mimetypes']); ?>"/>
        </div></div>
        <script type="text/javascript">
        $(function(){$('#<?php echo $id; ?> .dropzone').filedropbox({
          url: 'ajax.php/form/upload/<?php echo $this->field->get('id') ?>',
          link: $('#<?php echo $id; ?>').find('a.manual'),
          paramname: 'upload[]',
          fallback_id: 'file-<?php echo $id; ?>',
          allowedfileextensions: <?php echo JsonDataEncoder::encode(
            $config['__extensions'] ?: array()); ?>,
          allowedfiletypes: <?php echo JsonDataEncoder::encode(
            $mimetypes); ?>,
          maxfiles: <?php echo $config['max'] ?: 20; ?>,
          maxfilesize: <?php echo ($config['size'] ?: 1048576) / 1048576; ?>,
          name: '<?php echo $name; ?>[]',
          files: <?php echo JsonDataEncoder::encode($files); ?>
        });});
        </script>
<?php
    }

    function getValue() {
        $data = $this->field->getSource();
        $ids = array();
        // Handle manual uploads (IE<10)
        if ($_SERVER['REQUEST_METHOD'] == 'POST' && isset($_FILES[$this->name])) {
            foreach (AttachmentFile::format($_FILES[$this->name]) as $file) {
                try {
                    $F = $this->field->uploadFile($file);
                    $ids[] = $F->getId();
                }
                catch (FileUploadError $ex) {}
            }
            return array_merge($ids, parent::getValue() ?: array());
        }
        // If no value was sent, assume an empty list
        elseif ($data && is_array($data) && !isset($data[$this->name]))
            return array();

        return parent::getValue();
    }
}

class FileUploadError extends Exception {}

class FreeTextField extends FormField {
    static $widget = 'FreeTextWidget';

    function getConfigurationOptions() {
        return array(
            'content' => new TextareaField(array(
                'configuration' => array('html' => true, 'size'=>'large'),
                'label'=>__('Content'), 'required'=>true, 'default'=>'',
                'hint'=>__('Free text shown in the form, such as a disclaimer'),
            )),
        );
    }

    function hasData() {
        return false;
    }

    function isBlockLevel() {
        return true;
    }
}

class FreeTextWidget extends Widget {
    function render($options=array()) {
        $config = $this->field->getConfiguration();
        ?><div class=""><?php
        if ($label = $this->field->getLocal('label')) { ?>
            <h3><?php
            echo Format::htmlchars($label);
        ?></h3><?php
        }
        if ($hint = $this->field->getLocal('hint')) { ?>
        <em><?php
            echo Format::htmlchars($hint);
        ?></em><?php
        } ?>
        <div><?php
            echo Format::viewableImages($config['content']); ?></div>
        </div>
        <?php
    }
}

class VisibilityConstraint {

    const HIDDEN =      0x0001;
    const VISIBLE =     0x0002;

    var $initial;
    var $constraint;

    function __construct($constraint, $initial=self::VISIBLE) {
        $this->constraint = $constraint;
        $this->initial = $initial;
    }

    function emitJavascript($field) {
        $func = 'recheck';
        $form = $field->getForm();
?>
    <script type="text/javascript">
      !(function() {
        var <?php echo $func; ?> = function() {
          var target = $('#field<?php echo $field->getWidget()->id; ?>');

<?php   $fields = $this->getAllFields($this->constraint);
        foreach ($fields as $f) {
            $field = $form->getField($f);
            echo sprintf('var %1$s = $("#%1$s");',
                $field->getWidget()->id);
        }
        $expression = $this->compileQ($this->constraint, $form);
?>
          if (<?php echo $expression; ?>)
            target.slideDown('fast', function (){
                $(this).trigger('show');
                });
          else
            target.slideUp('fast', function (){
                $(this).trigger('hide');
                });
        };

<?php   foreach ($fields as $f) {
            $w = $form->getField($f)->getWidget();
?>
        $('#<?php echo $w->id; ?>').on('change', <?php echo $func; ?>);
        $('#field<?php echo $w->id; ?>').on('show hide', <?php
                echo $func; ?>);
<?php   } ?>
      })();
    </script><?php
    }

    /**
     * Determines if the field was visible when the form was submitted
     */
    function isVisible($field) {
        return $this->compileQPhp($this->constraint, $field);
    }

    function compileQPhp(Q $Q, $field) {
        if (!($form = $field->getForm())) {
            return $this->initial == self::VISIBLE;
        }
        $expr = array();
        foreach ($Q->constraints as $c=>$value) {
            if ($value instanceof Q) {
                $expr[] = $this->compileQPhp($value, $field);
            }
            else {
                @list($f, $op) = explode('__', $c, 2);
                $field = $form->getField($f);
                $wval = $field->getClean();
                switch ($op) {
                case 'eq':
                case null:
                    $expr[] = ($wval == $value && $field->isVisible());
                }
            }
        }
        $glue = $Q->isOred()
            ? function($a, $b) { return $a || $b; }
            : function($a, $b) { return $a && $b; };
        $initial = !$Q->isOred();
        $expression = array_reduce($expr, $glue, $initial);
        if ($Q->isNegated)
            $expression = !$expression;
        return $expression;
    }

    function getAllFields(Q $Q, &$fields=array()) {
        foreach ($Q->constraints as $c=>$value) {
            if ($c instanceof Q) {
                $this->getAllFields($c, $fields);
            }
            else {
                list($f, $op) = explode('__', $c, 2);
                $fields[$f] = true;
            }
        }
        return array_keys($fields);
    }

    function compileQ($Q, $form) {
        $expr = array();
        foreach ($Q->constraints as $c=>$value) {
            if ($value instanceof Q) {
                $expr[] = $this->compileQ($value, $form);
            }
            else {
                list($f, $op) = explode('__', $c, 2);
                $widget = $form->getField($f)->getWidget();
                $id = $widget->id;
                switch ($op) {
                case 'eq':
                case null:
                    $expr[] = sprintf('(%s.is(":visible") && %s)',
                            $id,
                            sprintf('%s == %s',
                                sprintf($widget->getJsValueGetter(), $id),
                                JsonDataEncoder::encode($value))
                            );
                }
            }
        }
        $glue = $Q->isOred() ? ' || ' : ' && ';
        $expression = implode($glue, $expr);
        if (count($expr) > 1)
            $expression = '('.$expression.')';
        if ($Q->isNegated)
            $expression = '!'.$expression;
        return $expression;
    }
}

class AssignmentForm extends Form {

    static $id = 'assign';
    var $_assignee = null;
    var $_dept = null;

    function __construct($source=null, $options=array()) {
        parent::__construct($source, $options);
        // Department of the object -- if necessary to limit assinees
        if (isset($options['dept']))
            $this->_dept = $options['dept'];
    }

    function getFields() {

        if ($this->fields)
            return $this->fields;

        $fields = array(
            'assignee' => new AssigneeField(array(
                    'id'=>1,
                    'label' => __('Assignee'),
                    'flags' => hexdec(0X450F3),
                    'required' => true,
                    'validator-error' => __('Assignee selection required'),
                    'configuration' => array(
                        'criteria' => array(
                            'available' => true,
                            ),
                        'dept' => $this->_dept ?: null,
                       ),
                    )
                ),
            'comments' => new TextareaField(array(
                    'id' => 2,
                    'label'=> '',
                    'required'=>false,
                    'default'=>'',
                    'configuration' => array(
                        'html' => true,
                        'size' => 'small',
                        'placeholder' => __('Optional reason for the assignment'),
                        ),
                    )
                ),
            );

        $this->setFields($fields);

        return $this->fields;
    }

    function isValid() {

        if (!parent::isValid())
            return false;

        // Do additional assignment validation
        if (!($assignee = $this->getAssignee())) {
            $this->getField('assignee')->addError(
                    __('Unknown assignee'));
        } elseif ($assignee instanceof Staff) {
            // Make sure the agent is available
            if (!$assignee->isAvailable())
                $this->getField('assignee')->addError(
                        __('Agent is unavailable for assignment')
                        );
        }

        return !$this->errors();
    }

    function getClean() {
        return parent::getClean();
    }

    function render($options) {

        switch(strtolower($options['template'])) {
        case 'simple':
            $inc = STAFFINC_DIR . 'templates/dynamic-form-simple.tmpl.php';
            break;
        default:
            throw new Exception(sprintf(__('%s: Unknown template style %s'),
                        'FormUtils', $options['template']));
        }

        $form = $this;
        include $inc;
    }

    function getAssignee() {

        if (!isset($this->_assignee)) {
            $value = $this->getField('assignee')->getClean();
            if ($value[0] == 's')
                $this->_assignee = Staff::lookup(substr($value, 1));
            elseif ($value[0] == 't')
                $this->_assignee = Team::lookup(substr($value, 1));
        }

        return $this->_assignee;
    }

    function assigneeCriteria() {
        $dept = $this->id;
        return function () use($dept) {
            return array('dept_id' =>$dept);
        };
    }
}

class TransferForm extends Form {

    static $id = 'transfer';
    var $_dept = null;

    function __construct($source=null, $options=array()) {
        parent::__construct($source, $options);
    }

    function getFields() {

        if ($this->fields)
            return $this->fields;

        $fields = array(
            'dept' => new DepartmentField(array(
                    'id'=>1,
                    'label' => __('Department'),
                    'flags' => hexdec(0X450F3),
                    'required' => true,
                    'validator-error' => __('Department selection required'),
                    )
                ),
            'comments' => new TextareaField(array(
                    'id' => 2,
                    'label'=> '',
                    'required'=>false,
                    'default'=>'',
                    'configuration' => array(
                        'html' => true,
                        'size' => 'small',
                        'placeholder' => __('Optional reason for the transfer'),
                        ),
                    )
                ),
            );

        $this->setFields($fields);

        return $this->fields;
    }

    function isValid() {

        if (!parent::isValid())
            return false;

        // Do additional validations
        if (!($dept = $this->getDept()))
            $this->getField('dept')->addError(
                    __('Unknown department'));

        return !$this->errors();
    }

    function getClean() {
        return parent::getClean();
    }

    function render($options) {

        switch(strtolower($options['template'])) {
        case 'simple':
            $inc = STAFFINC_DIR . 'templates/dynamic-form-simple.tmpl.php';
            break;
        default:
            throw new Exception(sprintf(__('%s: Unknown template style %s'),
                        get_class(), $options['template']));
        }

        $form = $this;
        include $inc;

    }

    function getDept() {

        if (!isset($this->_dept)) {
            if (($id = $this->getField('dept')->getClean()))
                $this->_dept = Dept::lookup($id);
        }

        return $this->_dept;
    }
}

/**
 * FieldUnchanged
 *
 * Thrown in the to_database() method to indicate the value should not be
 * saved in the database (it wasn't changed in the request)
 */
class FieldUnchanged extends Exception {}
?>