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<?php
include_once 'Thread.php';
class Category
{
public $id;
public $name;
public $description;
public $thread_count = 0;
public $post_count = 0;
// If an invalid id was passed into the constructor, the database will not have
// returned a result, but the object will not be null.
// We need to keep track of whether or not this object has a value.
private $has_value = false;
public function __construct($id)
{
$sql = "SELECT category_name, category_description, category_thread_count, category_post_count FROM categories WHERE category_id = ?;";
$result = Database::get()->query($sql, "i", $id);
if (empty($result)) {
return;
}
$this->id = $id;
$this->name = $result[0]['category_name'];
$this->description = $result[0]['category_description'];
$this->thread_count = $result[0]['category_thread_count'];
$this->post_count = $result[0]['category_post_count'];
$this->has_value = true;
}
// Returns true if this object was successfully fetched from the database
public function has_value(): bool
{
return $this->has_value;
}
public static function get_all_categories(): array
{
$sql = "SELECT category_id FROM categories ORDER BY category_id;";
$result = Database::get()->query($sql);
$categories = array();
foreach ($result as $row) {
$category = new Category($row['category_id']);
array_push($categories, $category);
}
return $categories;
}
public function get_threads(): array
{
$sql = "SELECT thread_id FROM threads WHERE thread_category = ? ORDER BY thread_last_post_date DESC";
$result = Database::get()->query($sql, "i", $this->id);
$threads = array();
foreach ($result as $row) {
$thread = new Thread($row['thread_id']);
if ($thread->has_value())
array_push($threads, $thread);
}
return $threads;
}
public function get_latest_thread(): Thread
{
$sql = "SELECT thread_id FROM threads WHERE thread_category = ? ORDER BY thread_last_post_date DESC LIMIT 1";
$result = Database::get()->query($sql, "i", $this->id);
return new Thread($result[0]['thread_id']);
}
}
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