class Paginator
{
	public $items_count = 0;
	public $page_size = 0;
	public $page_number = 0;

	public $pages_count = 0;

	public $sql_limit_from = 0;
	public $sql_limit_count = 0;

	public $array_start_index = 0;
	public $array_end_index = 0;

	public $page_numbers = array();
	public $active_page_number = 0;


	public function __construct($iItemsCount, $iPageSize, $iPageNumber)
	{
		$this->items_count = $iItemsCount;
		$this->page_size = $iPageSize;
		$this->page_number = $iPageNumber;

		$this->_compute_pages_count();

		$this->_compute_array_indices();
		$this->_compute_sql_limit();

		$this->_make_page_numbers();
		$this->active_page_number = $iPageNumber;

	}

	private function _compute_pages_count()
	{
		$this->pages_count = (int) ($this->items_count / $this->page_size);

		if ($this->items_count % $this->page_size > 0)
		{
			$this->pages_count += 1;
		}
	}

	private function _compute_array_indices()
	{
		$preliminary_array_start_index = $this->page_size * ($this->page_number - 1);

		if ($preliminary_array_start_index < $this->items_count)
		{
			$this->array_start_index = $preliminary_array_start_index;
		}
		else
		{
			$this->array_start_index = 0; //DO WELL . IMPLEMENT GOOD NUMBERS INDICATOR?
		}

		$preliminary_array_end_index = $this->page_size * ($this->page_number - 1) + $this->page_size - 1;

		if ($preliminary_array_end_index < $this->items_count)
		{
			$this->array_end_index = $preliminary_array_end_index;
		}
		else
		{
			$this->array_end_index = $this->items_count - 1;
		}

	}

	private function _compute_sql_limit()
	{
		$this->sql_limit_from = $this->page_size * ($this->page_number - 1);
		$this->sql_limit_count = $this->page_size;
	}

	private function _make_page_numbers()
	{
		$this->page_numbers = array();

		for ($number = 1; $number <= $this->pages_count; $number += 1)
		{
			$this->page_numbers[] = $number;
		}
	}
}