/
get_book_info.php
189 lines (175 loc) · 7.48 KB
/
get_book_info.php
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<?php
//kobler til database
require('../../koble_til_database.php');
session_start();
$error = array(
'nonexistant_book' => 'Boken er ikke registrert.',
'missing_variables' => 'Ingen rfid mottatt.',
'invalid_rfid' => 'Denne RFIDen hører ikke til en bok.'
);
if(!isset($_POST['rfid'])){
j_die($error['missing_variables']);
}
//Get the book ID
$book_rfid = $_POST['rfid'];
$get_bookid = "SELECT bookID FROM lib_RFID WHERE RFID = '" . $book_rfid . "' AND bookID != 0";
$get_bookid_qry = $conn->query($get_bookid);
if($get_bookid_qry->num_rows > 0){
if($bookid = $get_bookid_qry->fetch_assoc()){
$book_id = $bookid['bookID'];
}else{
j_die($error['invalid_rfid']);
}
}else{
j_die($error['invalid_rfid']);
}
$get_book = "SELECT * FROM lib_Book WHERE bookID = '" . $book_id . "'";
$get_book_qry = $conn->query($get_book);
$res = array('error' => "");
if ($get_book_qry->num_rows > 0) {
if($book = $get_book_qry->fetch_assoc()){
$total_lended_time = 0;
$borrowers = array();
$status = "Ikke lånt ut";
$get_lending_stats = "SELECT TIMESTAMPDIFF(SECOND,outDate,inDate) AS timediff, userID, inDate, outDate FROM lib_User_Book WHERE bookID = '".$book['bookID']."'";
$get_lending_stats_qry = $conn->query($get_lending_stats);
if($get_lending_stats_qry->num_rows > 0){
while($lending_stats = $get_lending_stats_qry->fetch_assoc()){
$total_lended_time = $total_lended_time + $lending_stats["timediff"];
if($lending_stats['inDate'] == null){
$status = "Lånt ut";
$current = true;
//Calculating live timediff
$currtime = time() - strtotime($lending_stats['outDate']);
}else{
$current = false;
$currtime = false;
}
$get_user = "SELECT * FROM lib_User WHERE userID = '".$lending_stats['userID']."'";
$get_user_qry = $conn->query($get_user);
if($get_user_qry->num_rows > 0){
if($user = $get_user_qry->fetch_assoc()){
//Get the RFID
$_rfid = "";
$get_rfid = "SELECT RFID FROM lib_RFID WHERE userID = '" . $user['userID'] . "'";
$get_rfid_qry = $conn->query($get_rfid);
if($get_rfid_qry->num_rows > 0){
if($rfid = $get_rfid_qry->fetch_assoc()){
$_rfid = $rfid['RFID'];
}
}
//Store the results
$borrowers[] = array(
'id' => $user['userID'],
'username' => $user['username'],
'RFID' => $_rfid,
'borrowed_time' => (int) $lending_stats["timediff"],
'current' => $current,
'current_time' => $currtime
);
}
}
}
if($borrowers == array()){
//Book never lended to anyone
}
}else{
//Query failed (SQL error or book never lended to no one)
}
$borrowers_v2 = array();
for($i = 0; $i < count($borrowers); $i++){
$x = registered_already($borrowers[$i], $borrowers_v2);
if($x != -1){
$borrowers_v2[$x]['borrowed_time'] += $borrowers[$i]['borrowed_time'];
$borrowers_v2[$x]['borrowed_times'] += 1;
if($borrowers[$i]['current'] == true){
$borrowers_v2[$x]['current'] = true;
$borrowers_v2[$x]['current_time'] = $borrowers[$i]['current_time'];
}
}else{
$borrowers_v2[] = array(
'id' => $borrowers[$i]['id'],
'username' => $borrowers[$i]['username'],
'RFID' => $borrowers[$i]['RFID'],
'borrowed_time' => $borrowers[$i]['borrowed_time'],
'borrowed_times' => 1,
'current' => $borrowers[$i]['current'],
'current_time' => $borrowers[$i]['current_time']
);
}
}
for($y = 0;$y < count($borrowers_v2); $y++){
if($borrowers_v2[$y]['current_time'] != false){
$borrowers_v2[$y]['borrowed_time'] = convertSecondsToReadable((int) $borrowers_v2[$y]['borrowed_time'] + (int) $borrowers_v2[$y]['current_time']);
$borrowers_v2[$y]['current_time'] = convertSecondsToReadable($borrowers_v2[$y]['current_time']);
$total_lended_time += (int) $borrowers_v2[$y]['current_time'];
}else{
$borrowers_v2[$y]['borrowed_time'] = convertSecondsToReadable($borrowers_v2[$y]['borrowed_time']);
}
}
//Find the feedback of the book
$feedback = array('comments' => array(), 'stars' => array());
$get_feedback = "SELECT * FROM lib_Feedback WHERE book_rfid = '". $book_rfid ."'";
$get_feedback_qry = $conn->query($get_feedback);
if ($get_feedback_qry->num_rows > 0) {
while($feedback_res = $get_feedback_qry->fetch_assoc()){
$type = $feedback_res['type']."s";
$feedback[$type][] = array(
'user_rfid' => $feedback_res['user_rfid'],
'value' => $feedback_res['value'],
'timestamp' => $feedback_res['timestamp']
);
}
}else{
//No feedback :O
}
//Calculate average amount of stars
$average_stars = 0;
if(count($feedback['stars']) > 0){
$total_stars = 0;
for($i = 0; $i < count($feedback['stars']); $i++){
$total_stars += intval($feedback['stars'][$i]['value']);
}
$average_stars = $total_stars / count($feedback['stars']);
}
$feedback['average_stars'] = $average_stars;
//Print book info
$res['book'] = array(
'ISBN10' => $book['ISBN10'],
'ISBN13' => $book['ISBN13'],
'total_lend_time' => convertSecondsToReadable($total_lended_time),
'total_lend_times' => count($borrowers),
'borrowers' => $borrowers_v2,
'feedback' => $feedback
);
echo json_encode($res);
}else{
//Query failed (nonexistant book or SQL error)
j_die($error['nonexistant_book']);
}
} else {
//Query failed (nonexistant book or SQL error)
j_die($error['nonexistant_book']);
}
function convertSecondsToReadable($seconds){
//Find difference in time in a readable format
$dtF = new DateTime("@0");
$dtT = new DateTime("@$seconds");
$readable["months"] = (int) $dtF->diff($dtT)->format('%m');
$readable["days"] = (int) $dtF->diff($dtT)->format('%a');
$readable["hours"] = (int) $dtF->diff($dtT)->format('%h');
$readable["minutes"] = (int) $dtF->diff($dtT)->format('%i');
$readable["seconds"] = (int) $dtF->diff($dtT)->format('%s');
$result = "";
$prev_value = false;
return $readable;
}
function registered_already($borrower, $borrowerarr){
for($i = 0; $i < count($borrowerarr); $i++){
if($borrowerarr[$i]['id'] == $borrower['id']){
return $i;
}
}
return -1;
}
?>