<?php

require_once "globals.php";
require_once "common_func.php";

require_once "controller.php";

$userdb = new \SleekDB\Store(USERDB, DATADIR, ["timeout" => false]);

const PRIVILEGE_PLAYER = "player";
const PRIVILEGE_CREATOR = "creator";
const PRIVILEGE_QUIZMASTER = "admin"; // TODO: refactor!

function add_user(string $nickname, string $password, string $realname, array $groupids = [], string $privilege = PRIVILEGE_PLAYER): bool
{
    global $userdb;
    if (count(get_user($nickname)) != 0) { // user exists
        return false;
    }

    $user_data = [
        "nickname" => $nickname,
        "password" => password_hash($password, PASSWORD_DEFAULT),
        "realname" => $realname,
        "groups" => $groupids,
        "privilege" => $privilege
    ];
    foreach ($groupids as $groupid) {
        change_group_user_assignments($groupid, $nickname, null);
    }
    $userdb->insert($user_data);
    return true; // user registration successful
}

function delete_user(string $nickname)
{
    global $userdb;
    if ($nickname == QUIZMASTER_NICKNAME) {
        return;
    }

    $user_data = get_user($nickname);
    if (count($user_data) !== 0) {
        foreach ($user_data["groups"] as $groupid) {
            change_group_user_assignments($groupid, null, $nickname);
        }
        $userdb->deleteBy(["nickname", "=", $nickname]);
    }
}

function get_user(string $nickname): array
{
    global $userdb;
    $user_data_array = $userdb->findBy(["nickname", "=", $nickname]);
    return count($user_data_array) != 0 ? $user_data_array[0] : [];
}

function update_user(array $user_data)
{
    global $userdb;
    return $userdb->update($user_data);
}

function change_password(string $nickname, string $old, string $new): bool
{
    $user_data = get_user($nickname);
    if (count($user_data) != 0) {
        if (password_verify($old, $user_data["password"])) {
            $user_data["password"] = password_hash($new, PASSWORD_DEFAULT);
            update_user($user_data);
            return true;
        }
    }
    return false;
}

function change_user_group_assignments(string $nickname, $groupname_add, $groupname_remove)
{
    $user_data = get_user($nickname);
    if (count($user_data) != 0) {
        alter_array_contents($user_data["groups"], $groupname_add, $groupname_remove);
        update_user($user_data); // update user
    }
}

function change_privilege_level(string $nickname, string $privilege)
{
    $user_data = get_user($nickname);
    if (count($user_data) != 0) {
        $user_data["privilege"] = $privilege;
        update_user($user_data);
    }
}

function check_user_credentials(string $nickname, string $password): bool
{
    $user_data = get_user($nickname);
    if (count($user_data) != 0) {
        return password_verify($password, $user_data["password"]);
    } else {
        return false;
    }
}

function get_all_users(): array
{
    global $userdb;
    return $userdb->findAll();
}

function get_all_nicknames() : array {
    $nicknames = [];
    $user_data_array = get_all_users();
    foreach ($user_data_array as $user_data) {
        $nicknames[] = $user_data["nickname"];
    }
    return $nicknames;
}