/**

 * Format text message for output

 *

 * @param string sKey - key of message

 * @param string sField - Human readable name of field

 *

 * @returns  string formatted message.

 **/

function validator_formatMes(sKey, sField, $sDef)

{

	var aMes = new Array();

		aMes['minlen']  = 'field value is too short.';

		aMes['maxlen']  = 'field value is too long.';

		aMes['max']     = 'field value is more than allowed.';

		aMes['min']     = 'field value is less then allowed.';

		aMes['pattern'] = 'field value has inadmissible format.';



	return ('"'+sField + '" : ' + ($sDef ? $sDef: aMes[sKey]));

}



/**

 * Get field value depending on field type

 * @param object oField field

 *

 * @returns string value of field

 * @todo add support for dates

 */

function validator_getValue(oField){

	var sVal = oField.value;

	if(oField.type.toLowerCase() == 'checkbox' && !oField.checked )

		sVal = '';

	return sVal;

}

/**

 * Check is form valid

 *

 * @param object oForm  - form to validate

 * @param array aShema  - array of validation shemas (hash) related to certan field

 * @param array aRules  - array of validation rules bentween 2 fields

 *

 * @returns  boolean  true if all is ok or false + alert wiht error messages if form contains errors.

 **/

function validator_isValid(oForm, aShema, aRules) {

	// errors

	var aErr  = new Array();



	// for each fields

	for( i=0; i< aShema.length; ++i )

	{

		var oShema = aShema[i];

		var sVal = validator_getValue(oForm.elements[aShema[i].field]);



		//optional param

		if( typeof(oShema.optional) != 'undefined' && !sVal.length)

			continue;

		$sMes = ( typeof(oShema.message) != 'undefined' ? oShema.message : '');



		// validation

		if ( typeof(oShema.minlen) != 'undefined' &&  oShema.minlen > sVal.length)

			aErr[aErr.length] = validator_formatMes('minlen', oShema.title, $sMes);



		if ( typeof(oShema.maxlen) != 'undefined' &&  oShema.maxlen < sVal.length)

			aErr[aErr.length] = validator_formatMes('maxlen', oShema.title, $sMes);



		if ( typeof(oShema.pattern) != 'undefined' && sVal.search(oShema.pattern) == -1 )

			aErr[aErr.length] = validator_formatMes('pattern', oShema.title, $sMes);



		if ( typeof(oShema.min) != 'undefined' &&  oShema.min > sVal)

			aErr[aErr.length] = validator_formatMes('min', oShema.title, $sMes);



		if ( typeof(oShema.max) != 'undefined' &&  oShema.max < sVal)

			aErr[aErr.length] = validator_formatMes('max', oShema.title, $sMes);

	}



	// for each rules

	if ( 'undefined' != typeof(aRules) ){

		for( i=0; i < aRules.length; ++i ) { // for each rules  0 - first op, 1 - second op, 2 - operation, 3 - Error message text

			var v1 = oForm.elements[aRules[i][0]].value;

			var v2 = oForm.elements[aRules[i][1]].value;

			switch( aRules[i][2] ){

				case '==' :

					if ( v1 != v2 )

						aErr[aErr.length] = aRules[i][3];

				break;

				

				case '<=' :

					if ( v1 > v2 )

						aErr[aErr.length] = aRules[i][3];

				break;

				

				case '!=' :

					if ( v1 == v2 )

						aErr[aErr.length] = aRules[i][3];

				case 'req' :

					if ( v1 && !v2 )

						aErr[aErr.length] = aRules[i][3];

				break;

			}

		}

	}

	//end rules



	if ( aErr.length ) {

		alert(aErr.join("\n\n"));

		return false;

	}

	return true;

}