<?php

namespace Slack\Blockkit\Blocks\Elements;

use \Exception;

use Slack\Blockkit\Element;

final class ExternalSelect extends Element
{
	protected const LIMITS = [
		'action_id' => 255,
		'placeholder' => 150,
	];

	/**
	 * @param Text $placeholder
	 * @param string $action_id
	 * @throws Exception
	 */
	public function __construct(Text $placeholder,string $action_id)
	{
		parent::__construct();

		// Defaults
		$this->type = 'external_select';

		if ($placeholder->type != 'plain_text')
			throw new Exception(sprintf('Text must be plain_text not %s',$placeholder->type));

		if (strlen($placeholder->text) > self::LIMITS['placeholder'])
			throw new Exception(sprintf('Text must be %d chars or less',self::LIMITS['placeholder']));

		$this->placeholder = $placeholder;

		$this->action_id = $this->validate('action_id',$action_id);
	}

	public static function item(Text $placeholder,string $action_id): self
	{
		return new self($placeholder,$action_id);
	}

	/* OPTIONAL ITEMS */

	public function confirm(Confirm $confirm): self
	{
		$this->confirm = $confirm;

		return $this;
	}

	// @note only 1 element in a view can have this set to true
	public function focus_on_load(bool $bool): self
	{
		$this->focus_on_load = $bool;

		return $this;
	}

	public function initial_option(string $option): self
	{
		$this->initial_option = $option;

		return $this;
	}

	public function min_query_length(int $int): self
	{
		if ($int < 1)
			throw new Exception('Minimum 1 options must be configured');

		$this->min_query_length = $int;

		return $this;
	}
}