<?php

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

	function api_request(){

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

		if( $url === false ){
			slog("Cannot find server's api url", 'api:update','update');
			return 127;
		}

		// remove unwanted spaces or linebreaks
		$url = preg_replace('/\s/', '', $url).'/update/';


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

		if( strlen($hash) != 128 ){
			slog("Wrong hash length (".strlen($hash).")", 'api:update','update');
			return 127;
		}

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

		if( $new_hash === false ){
			slog("cyclic-hash:new returned $new EXIT_STATUS", 'api:update','update');
			return 127;
		}

		/* (4) Fetch data */
		$data = json_decode(syscall(SOURCE_DIR.'/lib/api/fetch'), true);

		if( is_null($data) ){
			slog("api:fetch returned unreadable content", 'api:update','update');
			$data = [];
		}


		/* [2] Create httpRequest base
		=========================================================*/
		/* (1) Set URL */
		$curl = curl_init();
		curl_setopt($curl, CURLOPT_URL, $url);

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

		/* (3) Additional options */
		curl_setopt($curl, CURLOPT_FOLLOWLOCATION, true);
		curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false); // allow SSL


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

		/* (2) Set postdata raw to curl */
		curl_setopt($curl, CURLOPT_POSTFIELDS, $postarray);


		/* [4] Manage authentication
		=========================================================*/
		/* (1) Fetch warehouse token */
		$wh_tok = @file_get_contents(WAREHOUSE_TOK);

		if( $wh_tok === false ){
			slog("Cannot find warehouse token", 'api:update','update');
			return 127;
		}

		$wh_tok = preg_replace('/\s/', '', $wh_tok);

		/* (2) Calculate @new_hash (default value) */
		if( strlen($new_hash) != 128 )
			$new_hash = $hash;

		/* (3) Set Auth header digest */
		curl_setopt($curl, CURLOPT_HTTPHEADER, [
			"Authorization: Digest {$wh_tok}{$hash}{$new_hash}"
		]);


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

		/* (2) Save response to file */
		file_put_contents(TMP_DIR.'/api.response', $response);

		/* (3) Close request */
		curl_close($curl);

		/* (4) Return response as result */
		if( $response === false ){
			slog("Request error", 'api:update','update');
			return 127;
		}

		/* [6] Response management
		=========================================================*/
		/* (1) Try to json_decode response */
		$response_arr = json_decode($response, true);

		// if cannot, abort
		if( is_null($response_arr) ){
			slog('Cannot parse HTTP response', 'api:update', 'update');
			return 127;
		}

		/* (2) Check response error */
		if( !isset($response_arr['error']) || $response_arr['error'] != 0 ){
			slog('API error not on \'Success\'', 'api:update', 'update');
			return 127;
		}


		/* [7] Decrement cyclic-hash so request has ran successfully
		=========================================================*/
		/* (1) Decrement the hash */
		$decr = syscall(SOURCE_DIR.'/lib/cyclic-hash/decr');

		if( $decr === false ){
			slog("cyclic-hash:decr returned $decr EXIT_STATUS", 'api:update','update');
			return 127;
		}

		slog('HTTP Response succesfully received', 'api:update', 'update');

		/* [8] Deploy received data
		=========================================================*/
		/* (1) Manage response deployement */
		$deploy = syscall(SOURCE_DIR.'/lib/api/deploy');

		/* (2) Return state */
		return ($deploy === true) ? 0 : 127;


	}

	$exec = api_request();

	if( $exec == 0 ) slog('Success', 'api:update', 'update');
	else             slog('Failure', 'api:update', 'update');

	echo $exec;
	die($exec);


?>