<?php
/**
 * Created by PhpStorm.
 * User: whwyy
 * Date: 2018/4/9 0009
 * Time: 9:44
 */
declare(strict_types=1);

namespace Database\Base;


use ArrayIterator;
use Database\ActiveQuery;

use Exception;
use JetBrains\PhpStorm\Pure;
use ReflectionException;
use Snowflake\Abstracts\Component;
use Database\ActiveRecord;
use Snowflake\Channel;
use Snowflake\Exception\ComponentException;
use Snowflake\Exception\NotFindClassException;
use Snowflake\Snowflake;
use Traversable;

/**
 * Class AbstractCollection
 * @package Database\Base
 */
abstract class AbstractCollection extends Component implements \IteratorAggregate, \ArrayAccess
{

	/**
	 * @var ActiveRecord[]
	 */
	protected array $_item = [];

	protected ActiveRecord|string|null $model;

	protected ActiveQuery $query;


	public function clean()
	{
		unset($this->query, $this->model, $this->_item);
	}


	/**
	 * Collection constructor.
	 *
	 * @param $query
	 * @param array $array
	 * @param null $model
	 * @throws Exception
	 */
	public function __construct($query, array $array = [], $model = null)
	{
		$this->_item = $array;
		$this->query = $query;
		$this->model = $model;

		parent::__construct([]);
	}


	/**
	 * @return int
	 */
	#[Pure] public function getLength(): int
	{
		return count($this->_item);
	}


	/**
	 * @param $item
	 */
	public function setItems($item)
	{
		$this->_item = $item;
	}


	/**
	 * @param $model
	 */
	public function setModel($model)
	{
		$this->model = $model;
	}

	/**
	 * @param $item
	 */
	public function addItem($item)
	{
		array_push($this->_item, $item);
	}

	/**
	 * @return Traversable|CollectionIterator|ArrayIterator
	 * @throws Exception
	 */
	public function getIterator(): Traversable|CollectionIterator|ArrayIterator
	{
		return new CollectionIterator($this->model, $this->query, $this->_item);
	}


	/**
	 * @return mixed
	 * @throws ComponentException
	 * @throws Exception
	 */
	public function getModel(): ActiveRecord
	{
		$model = $this->model;;
		if (is_object($model)) {
			return $model;
		}
        return new $model();
	}


	/**
	 * @param mixed $offset
	 * @return bool
	 */
	public function offsetExists(mixed $offset): bool
	{
		return !empty($this->_item) && isset($this->_item[$offset]);
	}

	/**
	 * @param mixed $offset
	 * @return ActiveRecord|null
	 */
	public function offsetGet(mixed $offset): ?ActiveRecord
	{
		if (!$this->offsetExists($offset)) {
			return NULL;
		}

		if ($this->_item[$offset] instanceof ActiveRecord) {
			return $this->_item[$offset];
		}

		/** @var ActiveRecord $model */
		return $this->model::populate($this->_item[$offset]);
	}

	/**
	 * @param mixed $offset
	 * @param mixed $value
	 */
	public function offsetSet(mixed $offset, mixed $value)
	{
		$this->_item[$offset] = $value;
	}


	/**
	 * @param mixed $offset
	 */
	public function offsetUnset(mixed $offset)
	{
		if ($this->offsetExists($offset)) {
			unset($this->_item[$offset]);
		}
	}
}