<?php
namespace Szurubooru\Entities;

abstract class Entity
{
    protected $id = null;
    private $lazyLoaders = [];
    private $lazyContainers = [];
    private $meta;

    public function __construct($id = null)
    {
        $this->id = $id === null ? null : intval($id);
    }

    public function getId()
    {
        return $this->id;
    }

    public function setId($id)
    {
        $this->id = $id;
    }

    public function getMeta($metaName, $default = null)
    {
        if (!isset($this->meta[$metaName]))
            return $default;
        return $this->meta[$metaName];
    }

    public function setMeta($metaName, $value)
    {
        $this->meta[$metaName] = $value;
    }

    public function resetMeta()
    {
        $this->meta = [];
    }

    public function resetLazyLoaders()
    {
        $this->lazyLoaders = [];
        $this->lazyContainers = [];
    }

    public function setLazyLoader($lazyContainerName, $getter)
    {
        $this->lazyLoaders[$lazyContainerName] = $getter;
    }

    protected function lazyLoad($lazyContainerName, $defaultValue)
    {
        if (!isset($this->lazyContainers[$lazyContainerName]))
        {
            if (!isset($this->lazyLoaders[$lazyContainerName]))
            {
                return $defaultValue;
            }
            $result = $this->lazyLoaders[$lazyContainerName]($this);
            $this->lazySave($lazyContainerName, $result);
        }
        else
        {
            $result = $this->lazyContainers[$lazyContainerName];
        }
        return $result;
    }

    protected function lazySave($lazyContainerName, $value)
    {
        $this->lazyContainers[$lazyContainerName] = $value;
    }
}