<?php
namespace Workspace\UseCase;


/**
 * Basic input requirement handler used for service contracts.
 * @author andre.fourie
 */
class Requirement
{

	/**
	 * @var \Repo\Field\Collector
	 */
	protected $collector;
	/**
	 * @var array
	 */
	protected $requiredFields = array();
	/**
	 * @var array
	 */
	protected $inputFields = array();


	/**
	 * Initialize requirement.
	 * @return \Workspace\UseCase\Requirement
	 */
	public function __construct()
	{
		$this->collector = new \Repo\Field\Collector();
	}

	/**
	 * Add required input(s).
	 * @param string|array $input
	 * @return \Workspace\UseCase\Requirement
	 */
	public function addRequiredInput($input)
	{
		$newStack = $this->collector->collect($input);
		foreach ($newStack as $group => $fieldSet)
		{
			isset($this->requiredFields[$group])
				|| $this->requiredFields[$group] = array();
			isset($this->inputFields[$group])
				|| $this->inputFields[$group] = array();
			foreach ($fieldSet as $field => $validation)
			{
				$this->requiredFields[$group][$field] = $field;
			}
			$this->inputFields[$group] = array_merge($this->inputFields[$group], $fieldSet);
		}
		return $this;
	}

	/**
	 * Add optional input(s).
	 * @param string|array $input
	 * @return \Workspace\UseCase\Requirement
	 */
	public function addOptionalInput($input)
	{
		$newStack = $this->collector->collect($input);
		foreach ($newStack as $group => $fieldSet)
		{
			isset($this->inputFields[$group])
				|| $this->inputFields[$group] = array();
			$this->inputFields[$group] = array_merge($this->inputFields[$group], $fieldSet);
		}
		return $this;
	}

	/**
	 * Retrieve shortlist of required inputs.
	 * @return array
	 */
	public function getRequirements()
	{
		return $this->requiredFields;
	}

	/**
	 * Retrieve list of all inputs.
	 * @return array
	 */
	public function getInputs()
	{
		return $this->inputFields;
	}

}