<?php

namespace Slack;

use Illuminate\Support\Collection;

/**
 * Class BlockKit - Slack Blockit Objects
 *
 * @package Slack
 */
class BlockKit implements \JsonSerializable
{
	protected Collection $_data;

	public function __construct()
	{
		$this->_data = collect();
	}

	public function jsonSerialize()
	{
		return $this->_data;
	}

	/**
	 * Render a BlockKit Button
	 *
	 * @param string      $label
	 * @param string      $value
	 * @param string|null $action_id
	 * @return \Illuminate\Support\Collection
	 * @throws \Exception
	 */
	public function button(string $label,string $value,string $action_id=NULL): Collection
	{
		$x = collect();
		$x->put('type','button');
		$x->put('text',$this->text($label,'plain_text'));
		$x->put('value',$value);

		if ($action_id)
			$x->put('action_id',$action_id);

		return $x;
	}

	/**
	 * Render the input dialog
	 *
	 * @param string $label
	 * @param string $action
	 * @param int    $minlength
	 * @param string $placeholder
	 * @param bool   $multiline
	 * @param string $hint
	 * @param string $initial
	 * @return $this
	 * @throws \Exception
	 */
	protected function input(string $label,string $action,int $minlength,string $placeholder='',bool $multiline=FALSE,string $hint='',string $initial='')
	{
		$this->_data->put('type','input');
		$this->_data->put('element',[
			'type'=>'plain_text_input',
			'action_id'=>$action,
			'placeholder'=>$this->text($placeholder ?: ' ','plain_text'),
			'multiline'=>$multiline,
			'min_length'=>$minlength,
			'initial_value'=>$initial,
		]);
		$this->_data->put('label',[
			'type'=>'plain_text',
			'text'=>$label,
			'emoji'=>true,
		]);
		$this->_data->put('optional',$minlength ? FALSE : TRUE);

		if ($hint)
			$this->_data->put('hint',$this->text($hint,'plain_text'));

		return $this;
	}

	/**
	 * Returns a BlockKit Text item
	 *
	 * @param string $text
	 * @param string $type
	 * @return array
	 * @throws \Exception
	 */
	public function text(string $text,string $type='mrkdwn'): array
	{
		// Quick Validation
		if (! in_array($type,['mrkdwn','plain_text']))
			throw new \Exception('Invalid text type: '.$type);

		return [
			'type'=>$type,
			'text'=>$text,
		];
	}
}