<?php

//https://www.googleapis.com/books/v1/volumes?q=isbn:9781556437307&key=AIzaSyCMu2zVxIRw_ZymRBzXgCNwKaDdon2odJs
$isbn = $_POST['searchcode'];
$page = file_get_contents("https://www.googleapis.com/books/v1/volumes?q=isbn:".$isbn."&key=AIzaSyBsLWA8E91VrYijoWqsbeBA6L3h16Ce_i8");
echo $page;
$data = json_decode($page, true);

if ((@implode(",", $data['items'][0]['volumeInfo']['authors']) == NULL) && ($data['items'][0]['volumeInfo']['title'] == NULL) && ($data['items'][0]['volumeInfo']['publisher']) == NULL){
	echo ";N/A;N/A;N/A";
}

else {
		if ($data['items'][0]['volumeInfo']['title'] == NULL){
			$title = 'N/A';
		} else {
			$title = $data['items'][0]['volumeInfo']['title'];
		}
		if (@implode(",", $data['items'][0]['volumeInfo']['authors']) == NULL){
			$author = $data['items'][0]['volumeInfo']['publisher'];
		} else {
			$author = @implode(",", $data['items'][0]['volumeInfo']['authors']);
		}
		if ($data['items'][0]['volumeInfo']['publisher'] == NULL){
			$publisher = 'N/A';
		} else {
		$publisher = $data['items'][0]['volumeInfo']['publisher'];
		}
		if ($data['items'][0]['volumeInfo']['categories'] == NULL){
			$category = 'N/A';
		} else {
			$category = $data['items'][0]['volumeInfo']['categories'][0];
		}

		echo ";".$title.";".$author.";".$publisher.";".$category;

		}

?>