<?php
namespace EEPROM;

use Exception;
use JsonSerializable;

class UserNotFoundException extends Exception {}

class User implements JsonSerializable {
    private static $active;

    public static function hasActive(): bool {
        return !empty(self::$active);
    }
    public static function active(): self {
        return self::$active;
    }

    public function __construct() {
    }

    public function __destruct() {
        if($this === self::$active)
            self::$active = null;
    }
    public function setActive(): self {
        self::$active = $this;
        return $this;
    }

    public function getId(): int {
        return $this->user_id ?? 0;
    }

    public function getSizeMultiplier(): int {
        return $this->user_size_multiplier ?? 0;
    }

    public function getCreated(): int {
        return $this->user_created ?? 0;
    }

    public function getRestricted(): int {
        return $this->user_restricted ?? 0;
    }
    public function isRestricted(): bool {
        return $this->getRestricted() > 0;
    }

    public function jsonSerialize() {
        return [
            'id' => $this->getId(),
            'size_multi' => $this->getSizeMultiplier(),
            'created' => date('c', $this->getCreated()),
            'restricted' => $this->getRestricted() < 1 ? null : date('c', $this->getRestricted()),
        ];
    }

    public static function byId(int $userId): self {
        if($userId < 1)
            throw new UserNotFoundException;

        $createUser = DB::prepare('INSERT IGNORE INTO `prm_users` (`user_id`) VALUES (:id)');
        $createUser->bindValue('id', $userId);
        $createUser->execute();

        $getUser = DB::prepare('
            SELECT `user_id`, `user_size_multiplier`,
                UNIX_TIMESTAMP(`user_created`) AS `user_created`,
                UNIX_TIMESTAMP(`user_restricted`) AS `user_restricted`
            FROM `prm_users`
            WHERE `user_id` = :user
        ');
        $getUser->bindValue('user', $userId);
        $getUser->execute();
        $user = $getUser->fetchObject(self::class);

        if($user === false)
            throw new UserNotFoundException;

        return $user;
    }

    public static function all(int $limit = 0, int $after = 0): array {
        $query = '
            SELECT `user_id`, `user_size_multiplier`,
                UNIX_TIMESTAMP(`user_created`) AS `user_created`,
                UNIX_TIMESTAMP(`user_restricted`) AS `user_restricted`
            FROM `prm_users`
        ';

        if($after > 0)
            $query .= sprintf(' WHERE `user_id` > %d', $after);

        $query .= ' ORDER BY `user_id`';

        if($limit > 0)
            $query .= sprintf(' LIMIT %d', $limit);

        $getUsers = DB::prepare($query);
        $getUsers->execute();
        $out = [];

        while($user = $getUsers->fetchObject(self::class))
            $out[] = $user;

        return $out;
    }
}