<?php
/* 
 *  $Id$
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * This software consists of voluntary contributions made by many individuals
 * and is licensed under the LGPL. For more information, see
 * <http://www.phpdoctrine.com>.
 */
/**
 * Doctrine_Validator
 * Doctrine_Validator performs validations in record properties
 *
 * @package     Doctrine
 * @license     http://www.opensource.org/licenses/lgpl-license.php LGPL
 * @category    Object Relational Mapping
 * @link        www.phpdoctrine.com
 * @since       1.0
 * @version     $Revision$
 * @author      Konsta Vesterinen <kvesteri@cc.hut.fi>
 */
class Doctrine_Validator {    
    /**
     * @var array $validators           an array of validator objects
     */
    private static $validators  = array();
    /**
     * @var Doctrine_Null $null         a Doctrine_Null object used for extremely fast
     *                                  null value testing
     */
    private static $null;
    /**
     * initNullObject
     *
     * @param Doctrine_Null $null
     * @return void
     */
    public static function initNullObject(Doctrine_Null $null) {
        self::$null = $null;
    }
    /**
     * returns a validator object
     *
     * @param string $name
     * @return Doctrine_Validator_Interface
     */
    public static function getValidator($name) {
        if( ! isset(self::$validators[$name])) {
            $class = "Doctrine_Validator_".ucwords(strtolower($name));
            if(class_exists($class)) {
                self::$validators[$name] = new $class;
            } else {
			    throw new Doctrine_Exception("Validator named '$name' not availible.");
			} 
            
        }
        return self::$validators[$name];
    }
    /**
     * validates a given record and saves possible errors
     * in Doctrine_Validator::$stack
     *
     * @param Doctrine_Record $record
     * @return void
     */
    public function validateRecord(Doctrine_Record $record) {
        $columns   = $record->getTable()->getColumns();
        $component = $record->getTable()->getComponentName();

        $errorStack = $record->getErrorStack();
        
        
        // if record is transient all fields will be validated
        // if record is persistent only the modified fields will be validated
        $data = ($record->exists()) ? $record->getModified() : $record->getData();   

        $err      = array();
        foreach($data as $key => $value) {
            if($value === self::$null)
                $value = null;
            elseif($value instanceof Doctrine_Record) 
                $value = $value->getIncremented();

            $column = $columns[$key];
            
            if($column[0] == "enum") {
                $value = $record->getTable()->enumIndex($key, $value);

                if($value === false) {
                    $errorStack->add($key, 'enum');
                    continue;
                }
            }
            
            if($record->getTable()->getAttribute(Doctrine::ATTR_AUTO_LENGTH_VLD)) {
                if(!$this->validateLength($column, $key, $value)) {
                    $errorStack->add($key, 'length');
                    continue;
                }
            }

            if( ! is_array($column[2]))
                $e = explode("|",$column[2]);
            else
                $e = $column[2];


            foreach($e as $k => $arg) {
                if(is_string($k)) {
                    $name = $k;
                    $args = $arg;
                } else {
                    $args = explode(":",$arg);
                    $name = array_shift($args);
                    if( ! isset($args[0]))
                        $args[0] = '';
                }

                if(empty($name) || $name == 'primary' ||
                                   $name == 'protected' ||
                                   $name == 'autoincrement' ||
                                   $name == 'default')
                    continue;
                
                if(strtolower($name) == 'length') {
                    if(!$record->getTable()->getAttribute(Doctrine::ATTR_AUTO_LENGTH_VLD)) {
                        if(!$this->validateLength($column, $key, $value)) {
                            $errorStack->add($key, 'length');
                        }
                    }
                    continue;
                }
                
                if(strtolower($name) == 'type') {
                    if(!$record->getTable()->getAttribute(Doctrine::ATTR_AUTO_TYPE_VLD)) {
                        if( ! self::isValidType($value, $column[0])) {
                            $errorStack->add($key, 'type');
                        }
                    }
                    continue;
                }
                    
                $validator = self::getValidator($name);
                if( ! $validator->validate($record, $key, $value, $args)) {


                    $errorStack->add($key, $name);
                        
                    //$err[$key] = 'not valid';

                    // errors found quit validation looping for this column
                    //break;
                }
            }
            
            if($record->getTable()->getAttribute(Doctrine::ATTR_AUTO_TYPE_VLD)) {
                if( ! self::isValidType($value, $column[0])) {
                    $errorStack->add($key, 'type');
                    continue;
                }
            }
        }
    }
    /**
     * Enter description here...
     *
     */
    private function validateLength($column, $key, $value) {
        if($column[0] == "array" || $column[0] == "object")
            $length = strlen(serialize($value));
        else
            $length = strlen($value);
    
        if($length > $column[1]) {
            return false;
        }
        return true;
    }    
    /**
     * whether or not this validator has errors
     *
     * @return boolean
     */
    public function hasErrors() {
        return (count($this->stack) > 0);
    }
    /**
     * converts a doctrine type to native php type
     *
     * @param $doctrineType
     * @return string
     */
    public static function phpType($doctrineType) {
        switch($doctrineType) {
            case 'enum':
                return 'integer';
            case 'blob':
            case 'clob':
            case 'mbstring':
            case 'timestamp':
            case 'date':
            case 'gzip':
                return 'string';
            break;
            default:
                return $doctrineType;
        }
    }
    /**
     * returns whether or not the given variable is
     * valid type
     *
     * @param mixed $var
     * @param string $type
     * @return boolean
     */
    public static function isValidType($var, $type) {
        if($type == 'boolean')
            return true;

        $looseType = self::gettype($var);
        $type      = self::phpType($type); 

        switch($looseType):
            case 'float':
            case 'double':
            case 'integer':
                if($type == 'string' || $type == 'float')
                    return true;
            case 'string':
            case 'array':
            case 'object':
                return ($type === $looseType);
            break;
            case 'NULL':
                return true;
            break;
        endswitch;
    }
    /**
     * returns the type of loosely typed variable
     *
     * @param mixed $var
     * @return string
     */
    public static function gettype($var) {
        $type = gettype($var);
        switch($type):
            case 'string':
                if(preg_match("/^[0-9]+$/",$var)) 
                    return 'integer';
                elseif(is_numeric($var)) 
                    return 'float';
                else 
                    return $type;
            break;
            default:
                return $type;
        endswitch;
    }
}