<?php

require_once "AutoStoring.php";

class User extends AutoStoring
{
    private int $id; // User's ID
    private string $nickname; // User's nickname
    private string $password; // User's password in it's encoded form or left empty
    private string $realname; // User's real name displayed in their profile
//    private array $groups; // User's assigned groups
    private string $privilege; // User's privilege
    private UserMgr $userMgr; // UserManager object governing this object.

    // -------------------------------------------

    // Store modifications to the database.
    public function storeMods(): void
    {
        $this->userMgr->updateUser($this);
    }

    // -------------------------------------------

    function __construct(UserMgr &$usrmgr, int $id, string $nickname = null, string $password = null, string $realname = null, string $privilege = null)
    {
        parent::__construct();

        $this->id = $id;
        $this->nickname = $nickname;
        $this->password = $password;
        $this->realname = $realname;
//        $this->groups = $groups;
        $this->privilege = $privilege;

        // save reference to user manager
        $this->userMgr = &$usrmgr;
    }

    // Create user from an array
    static function fromArray(UserMgr &$usrmgr, array $a): User
    {
        $id = $a["_id"] ?? -1;
        return new User($usrmgr, $id, $a["nickname"], $a["password"], $a["realname"], $a["privilege"]);
    }

    // Convert user to array
    function toArray(array $omit = []): array
    {
        $a = [
            "_id" => $this->id,
            "nickname" => $this->nickname,
            "password" => $this->password,
            "realname" => $this->realname,
//            "groups" => $this->groups,
            "privilege" => $this->privilege
        ];

        // omit specific fields
        foreach ($omit as $field) {
            unset($a[$field]);
        }

        return $a;
    }

    // Change user password. If $safe, then $old is checked.
    function changePassword(string $new, string $old, bool $safe = true): bool
    {
        if (!$safe || password_verify($old, $this->password)) {
            $this->password = password_hash($new, PASSWORD_DEFAULT);
            $this->storeMods(); // store modifications
            return true;
        } else {
            return false;
        }
    }

//    // Change user groups
//    function changeGroups(array $add, array $remove): void
//    {
//        alter_array_contents($this->groups, $add, $remove);
//        $this->storeMods(); // store modifications
//    }

//    // Get user's groups
//    function getGroups(): array
//    {
//        return $this->groups;
//    }

    // Set user privilege level
    function setPrivilege(string $privilege): void
    {
        $this->privilege = ($this->nickname === QUIZMASTER_NICKNAME) ? PRIVILEGE_QUIZMASTER : $privilege; // quizmaster's privilege mustn't be tampered with
        $this->storeMods(); // store modifications
    }

    // Get user privilege level
    function getPrivilege(): string
    {
        return $this->privilege;
    }

    // Get user's nickname.
    function getNickname(): string
    {
        return $this->nickname;
    }

    // Set user's real name.
    function setRealname(string $realname): void
    {
        $this->realname = $realname;
    }

    // Get user's real name.
    function getRealname(): string
    {
        return $this->realname;
    }

    // Check against user credentials.
    function checkPassword(string $password): bool
    {
        return password_verify($password, $this->password);
    }

    // Has the user quizmaster privileges?
    function hasQuizmasterPrivilege(): bool
    {
        return $this->privilege == PRIVILEGE_QUIZMASTER;
    }
}