// Copyright 2011 Mark Cavage, Inc.  All rights reserved.

var assert = require('assert-plus');
var util = require('util');

var ASN1 = require('asn1').Ber;
var parents = require('ldap-filter');

var Filter = require('./filter');



///--- API

function EqualityFilter(options) {
  parents.EqualityFilter.call(this, options);
}
util.inherits(EqualityFilter, parents.EqualityFilter);
Filter.mixin(EqualityFilter);
module.exports = EqualityFilter;


EqualityFilter.prototype.matches = function (target, strictAttrCase) {
  assert.object(target, 'target');

  var tv = parents.getAttrValue(target, this.attribute, strictAttrCase);
  var value = this.value;

  if (this.attribute.toLowerCase() === 'objectclass') {
    /*
     * Perform case-insensitive match for objectClass since nearly every LDAP
     * implementation behaves in this manner.
     */
    value = value.toLowerCase();
    return parents.testValues(function (v) {
      return value === v.toLowerCase();
    }, tv);
  } else {
    return parents.testValues(function (v) {
      return value === v;
    }, tv);
  }
};


EqualityFilter.prototype.parse = function (ber) {
  assert.ok(ber);

  this.attribute = ber.readString().toLowerCase();
  this.value = ber.readString(ASN1.OctetString, true);

  if (this.attribute === 'objectclass')
    this.value = this.value.toLowerCase();

  return true;
};


EqualityFilter.prototype._toBer = function (ber) {
  assert.ok(ber);

  ber.writeString(this.attribute);
  ber.writeBuffer(this.raw, ASN1.OctetString);

  return ber;
};