<?php

namespace AlexLcDee\RegistryContainer;


class ItemsContainer
{
    /**
     * @var RegistrableItem[]
     */
    private $data = [];

    private $attributesMap = [];

    private $type;

    private $current = 0;

    /**
     * ItemsContainer constructor.
     * @param string $type type name of items inside container
     */
    public function __construct($type)
    {
        $this->type = $type;
    }

    /**
     * @param RegistrableItem $item
     * @throws RegistryException
     */
    public function add(RegistrableItem $item)
    {
        if (!($item instanceof $this->type)) {
            throw new RegistryException(strtr('Item must be an instance of {class}', [
                '{class}' => $this->type
            ]));
        }

        $this->data[] = $item;

        $this->mapAttributes($item, $this->current);

        $this->current++;
    }

    /**
     * @param RegistrableItem $item
     * @param int $itemPosition
     */
    private function mapAttributes(RegistrableItem $item, int $itemPosition)
    {
        if (!count($this->attributesMap)) {
            foreach ($item->getAttributes() as $attributeName => $attribute) {
                if (is_scalar($attribute)) {
                    $this->attributesMap[$attributeName] = [
                        $attribute => $itemPosition
                    ];
                }
            }
        } else {
            foreach ($item->getAttributes() as $attributeName => $attribute) {
                if (is_scalar($attribute)) {
                    $this->attributesMap[$attributeName][$attribute] = $itemPosition;
                }
            }
        }
    }

    /**
     * @param string $attributeName
     * @return array
     */
    public function getListOf(string $attributeName)
    {
        if (isset($this->attributesMap[$attributeName])) {
            return array_keys($this->attributesMap[$attributeName]);
        }
        return [];
    }

    /**
     * @param string $attributeName
     * @param mixed $value
     * @return null|RegistrableItem
     */
    public function getItemBy(string $attributeName, $value)
    {
        if (isset($this->attributesMap[$attributeName]) && isset($this->attributesMap[$attributeName][$value])) {
            $item = clone $this->data[$this->attributesMap[$attributeName][$value]];
            return $item;
        }
        return null;
    }
}