<?php

	require_once __DIR__.'/../../include/const';

	function api_sync(){

		/* [1] Fetch & generate useful data
		=========================================================*/
		/* (1) Fetch target url */
		$url = @file_get_contents(URL_CONF);

		if( $url === false )
			return 127;

		/* (2) Fetch cyclic hash */
		$hash = syscall(SOURCE_DIR.'/lib/cyclic-hash/hash');

		if( strlen($hash) != 128 )
			return 127;

		/* (3) Try new hash if available */
		$new = syscall(SOURCE_DIR.'/lib/cyclic-hash/new');
		
		if( $new === false )
			return 127;

		/* (4) Decrement the hash */
		$decr = syscall(SOURCE_DIR.'/lib/cyclic-hash/decr');

		if( $decr === false )
			return 127;

		/* (5) Generate the multipart boundary */
		$boundary = 'boundary--'.hash('sha512', uniqid()).'--boundary';

		/* (6) Fetch data */
		$data = json_decode(syscall(SOURCE_DIR.'/lib/api/fetchdata'));

		if( is_null($data) )
			$data = "{}";
		

		/* [2] Create httpRequest basis
		=========================================================*/
		/* (1) Set URL */
		$curl = curl_init($url);

		/* (2) Set HTTP method -> POST */
		curl_setopt($curl, CURLOPT_POST, true);


		/* [3] Manage post data
		=========================================================*/
		/* (1) Set post data */
		$postarray = [
			'token' => $hash,
			'data'  => $data
		];

		/* (2) Add renew if renew */
		if( strlen($new) == 128 )
			$postarray['renew'] = $new;

		/* (3) Parse postfiels to multipart format */
		$postraw = "--$boundary";

		foreach($postarray as $postkey=>$postvalue)
			$postraw .= "\r\ncontent-disposition: form-data; name=\"$postkey\"\r\n\r\n$postvalue\r\n--$boundary";

		$postraw .= "--";
		

		/* (4) Set postdata raw to curl */
		curl_setopt($curl, CURLOPT_POSTFIELDS, $postraw);


		/* [4] Manage headers
		=========================================================*/
		curl_setopt($curl, CURLOPT_HTTPHEADER, [
			"Content-Type: multipart/form-data; boundary=$boundary",
			"Content-Length: ".strlen($postraw)
		]);


		/* [5] Send and catch request response
		=========================================================*/
		/* (1) Send and catch response */
		$response = curl_exec($curl);

		/* (2) Close request */
		curl_close($curl);
		
		/* (3) Return response as result */
		return $response;
		
	}

	echo api_sync();
	
	
?>