<?php

function username_exists(string $username): bool
{
	$sql = "SELECT * FROM users WHERE user_name = ?;";
	$result = Database::get()->query($sql, "s", $username);

	return !empty($result);
}

function register_user(string $username, string $pass_hash)
{
	$sql = "INSERT INTO users(user_name, user_pass, user_date, user_level) VALUES(?, ?, NOW(), 0);";
	Database::get()->query($sql, "ss", $username, $pass_hash);
}

function change_password(User $user, string $pass_hash)
{
	if (!Session::get()->is_signed_in()) {
		trigger_error('You are not signed in.');
		return;
	}

	if (Session::get()->get_current_user()->id != $user->id) {
		trigger_error("You can't change another user's password.");
		return;
	}

	$sql = "UPDATE users SET user_pass = ? WHERE user_id = ?;";
	Database::get()->query($sql, "si", $pass_hash, $user->id);
}