<?php

    class ZExt_Auth_Adapter implements Zend_Auth_Adapter_Interface
    {
        const NOT_FOUND_MSG = "Account not found";
        const CREDENTIAL_INVALID_MSG = "Password is invalid";

        /**
         *
         * @var Model\User
         */
        protected $user;

        /**
         *
         * @var string
         */
        protected $username = "";

        /**
         *
         * @var string
         */
        protected $password = "";

        public function __construct($username, $password)
        {
            $this->username = $username;
            $this->password = $password;
        }

        /**
         * Performs an authentication attempt
         *
         * @throws Zend_Auth_Adapter_Exception If authentication cannot be performed
         * @return Zend_Auth_Result
         */
        public function authenticate()
        {
            try
            {
                $this->user = Models\User::authenticate($this->username, $this->password);
                return $this->createResult(Zend_Auth_Result::SUCCESS);
            }
            catch (Exception $e)
            {
                if ($e->getMessage() == Models\User::CREDENTIAL_INVALID)
                    return $this->createResult(Zend_Auth_Result::FAILURE_CREDENTIAL_INVALID, array(self::CREDENTIAL_INVALID_MSG));
                elseif ($e->getMessage() == Models\User::NOT_FOUND)
                    return $this->createResult(Zend_Auth_Result::FAILURE_IDENTITY_NOT_FOUND, array(self::NOT_FOUND_MSG));
            }

        }

        private function createResult($code, $messages = array())
        {
            return new Zend_Auth_Result($code, $this->user, $messages);
        }


    }