<?php
// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0


// snippet-start:[cloudwatch.php.set_alarm.complete]
// snippet-start:[cloudwatch.php.set_alarm.import]
require 'vendor/autoload.php';

use Aws\CloudWatch\CloudWatchClient;
use Aws\Exception\AwsException;

// snippet-end:[cloudwatch.php.set_alarm.import]

/* ////////////////////////////////////////////////////////////////////////////
 * Purpose: Sets the state of the specified alarm in Amazon CloudWatch.
 *
 * Prerequisites: At least one CloudWatch alarm.
 *
 * Inputs:
 * - $cloudWatchClient: An initialized CloudWatch client.
 * - $cloudWatchRegion: The alarm's AWS Region.
 * - $alarmName: The alarm's name.
 * - $stateValue: The alarm's new state.
 * - $stateReason: The reason for the alarm.
 *
 * Returns: Information about the alarm's state change request;
 * otherwise, the error message.
 * ///////////////////////////////////////////////////////////////////////// */

// snippet-start:[cloudwatch.php.set_alarm.main]
function setAlarmState(
    $cloudWatchClient,
    $cloudWatchRegion,
    $alarmName,
    $stateValue,
    $stateReason
) {
    try {
        $result = $cloudWatchClient->setAlarmState([
            'AlarmName' => $alarmName,
            'StateValue' => $stateValue,
            'StateReason' => $stateReason
        ]);

        if (isset($result['@metadata']['effectiveUri'])) {
            if (
                $result['@metadata']['effectiveUri'] ==
                'https://monitoring.' . $cloudWatchRegion . '.amazonaws.com'
            ) {
                return 'Successfully changed state of specified alarm.';
            } else {
                return 'Could not change state of specified alarm.';
            }
        } else {
            return 'Could not change state of specified alarm.';
        }
    } catch (AwsException $e) {
        return 'Error: ' . $e->getAwsErrorMessage();
    }
}

function setTheAlarmState()
{
    $alarmName = 'my-ec2-resources';
    $stateValue = 'OK';
    $stateReason = 'AWS SDK for PHP example code set the state of the alarm ' .
        $alarmName . ' to ' . $stateValue;

    $cloudWatchRegion = 'us-east-1';
    $cloudWatchClient = new CloudWatchClient([
        'profile' => 'default',
        'region' => $cloudWatchRegion,
        'version' => '2010-08-01'
    ]);

    echo setAlarmState(
        $cloudWatchClient,
        $cloudWatchRegion,
        $alarmName,
        $stateValue,
        $stateReason
    );
}

// Uncomment the following line to run this code in an AWS account.
// setTheAlarmState();
// snippet-end:[cloudwatch.php.set_alarm.main]
// snippet-end:[cloudwatch.php.set_alarm.complete]