<?php
/*
 * Copyright 2016, Google Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * 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
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 */

namespace Google\GAX\UnitTests\Mocks;

use Google\Auth\FetchAuthTokenInterface;

class MockCredentialsLoader implements FetchAuthTokenInterface
{
    private $tokens;
    private $index = -1;

    public function __construct($scopes, $tokens)
    {
        $this->scopes = $scopes;
        $this->tokens = $tokens;
    }

    public function fetchAuthToken(callable $httpHandler = null)
    {
        $this->index = ($this->index + 1) % count($this->tokens);
        return $this->tokens[$this->index];
    }

    public function getCacheKey()
    {
        return 'accessTokenCacheKey';
    }

    public function getLastReceivedToken()
    {
        if ($this->index == -1) {
            return null;
        } else {
            return $this->tokens[$this->index];
        }
    }
}