<?php



$client_ID='';
$client_secret='';

$token="";















$tokenfile=__FILE__.'.token.txt';
if(isset($argv)){
	$device_name=$argv[1];
}else if(isset($_SERVER['QUERY_STRING'])){
	$device_name=$_SERVER['QUERY_STRING'];
}else{
	echo 'specify device name via ARGV or QUERY_STRING';
	exit;
}


function post($url,$body,$headers){
	$curl=curl_init($url);
	curl_setopt_array($curl,array(
//CURLOPT_VERBOSE=>true,
		CURLOPT_RETURNTRANSFER=>true,
		CURLOPT_POST=>true,
		CURLOPT_POSTFIELDS =>$body,
		CURLOPT_HTTPHEADER=>$headers
	));
	$res=curl_exec($curl);
	curl_close($curl);
	return($res);
}


if(!file_exists($tokenfile)){
	$json=post('https://api.amazon.com/auth/o2/token',http_build_query(array(
		'grant_type'=>'refresh_token',
		'refresh_token'=>$token,
		'client_id'=>$client_ID,
		'client_secret'=>$client_secret,
	)),array('Content-Type: application/x-www-form-urlencoded;Accept-Charset=UTF-8'));
	file_put_contents($tokenfile,$json);
	$token=json_decode($json,true);


}else{
	$token=json_decode(file_get_contents($tokenfile),true);
	if(filemtime($tokenfile)+$token['expires_in']<time()){
		$json=post('https://api.amazon.com/auth/o2/token',http_build_query(array(
			'grant_type'=>'refresh_token',
			'refresh_token'=>$token['refresh_token'],
			'client_id'=>$client_ID,
			'client_secret'=>$client_secret,
		)),array('Content-Type: application/x-www-form-urlencoded;Accept-Charset=UTF-8'));
		file_put_contents($tokenfile,$json);
		$token=json_decode($json,true);
	}
}

$access_token=$token['access_token'];

$t=time()-5;
foreach(array('NOT_DETECTED','DETECTED') as $state){
	$messageId=$device_name.'-'.$t;
	$time=gmdate("Y-m-d\\TH:i:s",$t).'.00Z';
	post('https://api.fe.amazonalexa.com/v3/events',<<<EOJSON
{
  "context":{
    "properties": [
      {
        "namespace": "Alexa.EndpointHealth",
        "name": "connectivity",
        "value": {
          "value": "OK"
        },
        "timeOfSample": "$time",
        "uncertaintyInMilliseconds": 0
      }
    ]
  },
  "event":{
    "header":{
      "messageId":"$messageId",
      "namespace":"Alexa",
      "name":"ChangeReport",
      "payloadVersion":"3"
    },
    "endpoint":{
      "scope":{
        "type":"BearerToken",
        "token":"$access_token"
       },
       "endpointId":"$device_name"
    },
    "payload":{
      "change":{
        "cause":{
          "type":"PHYSICAL_INTERACTION"
        },
        "properties":[
          {
            "namespace":"Alexa.MotionSensor",
            "name":"detectionState",
            "value":"$state",
            "timeOfSample":"$time",
            "uncertaintyInMilliseconds":0
          }
        ]
      }
    }
  }
}
EOJSON
	,array(
		'Authorization: Bearer '.$token['access_token'],
		'Content-Type: application/json',
	));
	$t+=5;
}