
<?php
/*
 * conditional behavior, allow to turn on/off validations based on condition
*/

class ConditionalValidationBehavior extends ModelBehavior
{
    /* store the current validation, useful if case of multiple 'save' in same action
    *  see beforeValidate and 'restore' parameter (also afterSave)
    */

    var $savedValidation = array();

    /* initialize the settings */

	function setup(&$model, $params = array())
	{
        $this->settings[$model->name] = $params;
	}

	/* in case we need to restore the validation */

    function afterSave(&$model)
    {
        if($this->savedValidation && is_array($this->savedValidation) && in_array($model->name, $this->savedValidation))
        {
            $model->validate = $this->savedValidation[$model->name];
            unset($this->savedValidation[$model->name]);
        }
    }

    // set the model $validate array

    function beforeValidate(&$model)
    {
        if(empty($this->settings[$model->name]))
            return;

        if(isset($this->settings[$model->name]['restore']) && $this->settings[$model->name]['restore'])
            $this->savedValidation[$model->name] = $model->validate;

        /* the data in condition must be coded as $data['Model']['field'] (do not use $this->data) */

        foreach($this->settings[$model->name] as $condition)
        {
            /* avoid the "restore" parameter */
            
            if(!is_array($condition))
                continue;
                
            if(isset($condition['condition']) && !empty($condition['condition']))
            {
                if(method_exists($model, $condition['condition']))
                {
                    $rc = $model->{$condition['condition']}();
                }
                else
                {
                    $f  = create_function('&$data', $this->_formatCondition($condition['condition']));
                    $rc = $f($model->data);
                }
            }
            else
                $rc = true;

            /* reference to this->data passed to the function to evaluate the condition,
                if 'condition' is not present, the condition will be assumed as true
            */

            if($rc)
            {
                $option = array_merge(array('remove' => array(), 'validate' => array()), $condition);

                /* remove the fields in $validate */

                if(!empty($option['remove']))
                {
                    foreach($option['remove'] as $rmfield)
                        unset($model->validate[$rmfield]);
                }

                /* add some fields to validate */

                if(!empty($option['validate']))
                {
                    foreach($option['validate'] as $key => $addfield)
                        $model->validate[$key] = $addfield;
                }
            }
        }

        return;
    }

    // check the fields in conditions "Model.field" will be replace by $data['Model']['field'], sane with 'model.field'
    // They might be a better way (for more level), but I am not so confortable with regexp...
    // comments and suggestions are welcome

    function _formatCondition($condition)
    {
        $nb = preg_match_all('/(\'|"|\b)+\w+\.+\w+\1/', $condition, $match, PREG_OFFSET_CAPTURE);

        if($nb)
        {
            $search = array('\'', '"', '.');
            $rep    = array('', '', '\'][\'');

            foreach($match[0] as $repfield)
            {
                $condition = str_replace($repfield[0], '$data[\''.str_replace($search, $rep, $repfield[0]).'\']', $condition);
            }
        }
        return 'return '.$condition.' ? true : false;';
    }
}
?>