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ladder_join.php

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<?php
require "auth.php";
require "database.php";
requireLogin();

$error = "";

if ($_SERVER["REQUEST_METHOD"] === "POST") {
    $inviteCode = $_POST["invite_code"];

    $stmt = $conn->prepare(
        "SELECT LadderID FROM Ladder WHERE InviteCode = ?"
    );
    $stmt->execute([$inviteCode]);
    $ladder = $stmt->fetch();

    if (!$ladder) {
        $error = "Ladder not found";
    } else {

        $ladderID = $ladder["LadderID"];

        // check to see if player is already in the ladder
        $stmt = $conn->prepare(
            "SELECT * FROM LadderPlayers WHERE PlayerID = ? AND LadderID = ?"
        );
        $stmt->execute([$_SESSION["player_id"], $ladderID]);

        if ($stmt->fetch()) {
            $error = "You are already in this ladder";
        } else {
            $stmt = $conn->prepare(
                "INSERT INTO LadderPlayers (PlayerID, LadderID)
                 VALUES (?, ?)"
            );
            $stmt->execute([
                $_SESSION["player_id"],
                $ladderID
            ]);

            header("Location: ladder.php?id=" . $ladderID);
            exit;
        }
    }
}
?>

<!DOCTYPE html>
<html>
<head>
    <title>Join Ladder</title>
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/css/bootstrap.min.css" rel="stylesheet">
</head>
<body>
<div class="container mt-5">
    <h2>Join Ladder</h2>

    <?php if ($error): ?>
        <div class="alert alert-danger"><?= $error ?></div>
    <?php endif; ?>

    <form method="POST">
        <input class="form-control mb-2" name="invite_code" placeholder="Invite Code">
        <button class="btn btn-primary">Join</button>
        <a href="dashboard.php" class="btn btn-secondary">Back</a>
    </form>
</div>
</body>
</html>