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<?php
declare(strict_types=1);
// Like model: database operations for the likes table.
namespace App\Models;
use App\Database;
class Like
{
private \PDO $pdo;
public function __construct()
{
$this->pdo = Database::getInstance()->getPdo();
}
/**
* Toggle a like: insert if not yet liked, delete if already liked.
* Returns true if the post is now liked, false if unliked.
*/
public function toggle(int $userId, int $postId): bool
{
// INSERT IGNORE silently fails when the UNIQUE(user_id, post_id) constraint
// is violated, meaning the user already liked this post
$stmt = $this->pdo->prepare(
'INSERT IGNORE INTO likes (user_id, post_id) VALUES (:user_id, :post_id)'
);
$stmt->execute(['user_id' => $userId, 'post_id' => $postId]);
if ($stmt->rowCount() > 0) {
return true;
}
// Row wasn't inserted → already liked → remove the like
$stmt = $this->pdo->prepare(
'DELETE FROM likes WHERE user_id = :user_id AND post_id = :post_id'
);
$stmt->execute(['user_id' => $userId, 'post_id' => $postId]);
return false;
}
public function countByPost(int $postId): int
{
$stmt = $this->pdo->prepare('SELECT COUNT(*) FROM likes WHERE post_id = :post_id');
$stmt->execute(['post_id' => $postId]);
return (int) $stmt->fetchColumn();
}
public function hasUserLiked(int $userId, int $postId): bool
{
$stmt = $this->pdo->prepare(
'SELECT 1 FROM likes WHERE user_id = :user_id AND post_id = :post_id LIMIT 1'
);
$stmt->execute(['user_id' => $userId, 'post_id' => $postId]);
return $stmt->fetch() !== false;
}
}
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