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upVote.php
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<?php
include_once 'server.php';
session_start();
$errors = array();
$response = [];
$response['status'] = "";
//needs question ID or answerID
$vote = $_POST['vote'];
$item = $_POST['item']; //item can be question or answer
$userID = $_SESSION['userID'];
// vote can be "up" or "down"
//updates the old voteCount stored in database with voteCount +/- 1 depending on vote
//user must be signed in to vote
//user can only vote a maximum of +1 or -1 for each question or answer
if ($item == "question"){
$questionID = $_POST['questionID'];
$fetchVoteQuery = "SELECT * FROM votes WHERE votes.voterID = '$userID' AND votes.questionID = '$questionID'";
$voteRes = mysqli_query($db, $fetchVoteQuery);
$previousVote = mysqli_fetch_assoc($voteRes);
if (($voteRes->num_rows) == 0){
if ($vote=="up"){
$voteQuery = "INSERT INTO votes (voterID, questionID, upVote) VALUES ($userID, $questionID, '1')";
mysqli_query($db, $voteQuery);
$updateQuery = "UPDATE questions SET voteCount = (voteCount + 1) WHERE questionID = $questionID";
mysqli_query($db, $updateQuery);
}
else if ($vote=="down"){
$voteQuery = "INSERT INTO votes (voterID, questionID, upVote) VALUES ('$userID' , '$questionID', '0')";
mysqli_query($db, $voteQuery);
$updateQuery = "UPDATE questions SET voteCount = (voteCount - 1) WHERE questionID = $questionID";
mysqli_query($db, $updateQuery);
}
$response['status'] = "success";
}
else{
$hasVoted=$previousVote['hasVoted'];
$upVote=$previousVote['upVote'];
if ($vote=="up"){
if(($hasVoted == 1 && $upVote == 0) || $hasVoted==0 ){
$updateQuery = "UPDATE questions SET voteCount = (voteCount + 1) WHERE questionID = $questionID";
mysqli_query($db, $updateQuery);
if ($hasVoted == 1){
$voteQuery = "UPDATE votes SET hasVoted = 0 WHERE voterID = '$userID' AND votes.questionID = $questionID";
mysqli_query($db, $voteQuery);
}
else{
$voteQuery = "UPDATE votes SET upVote = 1, hasVoted = 1 WHERE voterID = '$userID' AND votes.questionID = $questionID";
mysqli_query($db, $voteQuery);
}
$response['status'] = "success";
}
}
else if ($vote=="down"){
if(($hasVoted == 1 && $upVote == 1) || $hasVoted==0 ){
$updateQuery = "UPDATE questions SET voteCount = (voteCount - 1) WHERE questionID = $questionID";
mysqli_query($db, $updateQuery);
if ($hasVoted == 1){
$voteQuery = "UPDATE votes SET upVote = 0, hasVoted = 0 WHERE voterID = '$userID' AND votes.questionID = $questionID";
mysqli_query($db, $voteQuery);
}
else{
$voteQuery = "UPDATE votes SET upVote = 0, hasVoted = 1 WHERE voterID = '$userID' AND votes.questionID = $questionID";
mysqli_query($db, $voteQuery);
}
$response['status'] = "success";
}
}
}
}
else{
$answerID = $_POST['answerID'];
$fetchVoteQuery = "SELECT * FROM `votes` WHERE votes.voterID = '$userID' AND votes.answerID = '$answerID'";
$voteRes = mysqli_query($db, $fetchVoteQuery);
$previousVote = mysqli_fetch_assoc($voteRes);
if (($voteRes->num_rows) == 0){
if ($vote=="up"){
$voteQuery = "INSERT INTO votes (voterID, answerID, upVote) VALUES ('$userID' ,' $answerID','1');";
mysqli_query($db, $voteQuery);
$updateQuery = "UPDATE answers SET voteCount = (voteCount + 1) WHERE answerID = $answerID";
mysqli_query($db, $updateQuery);
}
else if ($vote=="down"){
$voteQuery = "INSERT INTO votes (voterID, answerID, upVote) VALUES ('$userID' , '$answerID', '0');";
mysqli_query($db, $voteQuery);
$updateQuery = "UPDATE answers SET voteCount = (voteCount - 1) WHERE answerID = '$answerID'";
mysqli_query($db, $updateQuery);
}
$response['status'] = "success";
}
else{
$hasVoted=$previousVote['hasVoted'];
$upVote=$previousVote['upVote'];
if ($vote=="up"){
if(($hasVoted == 1 && $upVote == 0) || $hasVoted==0 ){
$updateQuery = "UPDATE answers SET voteCount = (voteCount + 1) WHERE answerID = $answerID";
mysqli_query($db, $updateQuery);
if ($hasVoted == 1){
$voteQuery = "UPDATE votes SET hasVoted = 0 WHERE voterID = '$userID' AND votes.answerID = $answerID";
mysqli_query($db, $voteQuery);
}
else{
$voteQuery = "UPDATE votes SET upVote = 1, hasVoted = 1 WHERE voterID = '$userID' AND votes.answerID = $answerID";
mysqli_query($db, $voteQuery);
}
$response['status'] = "success";
}
}
else if ($vote=="down"){
if(($hasVoted == 1 && $upVote == 1) || $hasVoted==0 ){
$updateQuery = "UPDATE answers SET voteCount = (voteCount - 1) WHERE answerID = $answerID";
mysqli_query($db, $updateQuery);
if ($hasVoted == 1){
$voteQuery = "UPDATE votes SET upVote = 0, hasVoted = 0 WHERE voterID = '$userID' AND votes.answerID = $answerID";
mysqli_query($db, $voteQuery);
}
else{
$voteQuery = "UPDATE votes SET upVote = 0, hasVoted = 1 WHERE voterID = '$userID' AND votes.answerID = $answerID";
mysqli_query($db, $voteQuery);
}
$response['status'] = "success";
}
}
}
}
mysqli_free_result($voteRes);
header('Content-type: application/json');
echo (json_encode($response));
// if(isset($_SESSION['userID'])){
// $userID = $_SESSION['userID'];
//
// if ($vote === "up"){
// $voteQuery = "UPDATE questions SET voteCount = (voteCount + 1) WHERE questionID = $questionID";
// }
// else{
// $voteQuery = "UPDATE questions SET voteCount = (voteCount - 1) WHERE questionID = $questionID";
// }
// mysqli_query($db,$voteQuery);
// }
?>