<?php

namespace WMDE\HamcrestHtml;

use DOMAttr;
use DOMElement;
use Hamcrest\Description;
use Hamcrest\Matcher;
use Hamcrest\Util;

class AttributeMatcher extends TagMatcher {

	/**
	 * @var Matcher
	 */
	private $attributeNameMatcher;

	/**
	 * @var Matcher|null
	 */
	private $valueMatcher;

	/**
	 * @param Matcher|string $attributeName
	 *
	 * @return self
	 */
	public static function withAttribute( $attributeName ) {
		return new static( Util::wrapValueWithIsEqual( $attributeName ) );
	}

	/**
	 * @param Matcher $attributeNameMatcher
	 */
	public function __construct( Matcher $attributeNameMatcher ) {
		parent::__construct();

		$this->attributeNameMatcher = $attributeNameMatcher;
	}

	/**
	 * @param Matcher|string $value
	 *
	 * @return AttributeMatcher
	 */
	public function havingValue( $value ) {
		// TODO: Throw exception if value is set
		$result = clone $this;
		$result->valueMatcher = Util::wrapValueWithIsEqual( $value );

		return $result;
	}

	public function describeTo( Description $description ) {
		$description->appendText( 'with attribute ' )
			->appendDescriptionOf( $this->attributeNameMatcher );
		if ( $this->valueMatcher ) {
			$description->appendText( ' having value ' )
				->appendDescriptionOf( $this->valueMatcher );
		}
	}

	/**
	 * @param DOMElement $item
	 * @param Description $mismatchDescription
	 *
	 * @return bool
	 */
	protected function matchesSafelyWithDiagnosticDescription(
		$item, Description $mismatchDescription
	) {
		/** @var DOMAttr $attribute */
		foreach ( $item->attributes as $attribute ) {
			if ( $this->valueMatcher ) {
				if (
					$this->attributeNameMatcher->matches( $attribute->name )
					&& $this->valueMatcher->matches( $attribute->value )
				) {
					return true;
				}
			} elseif ( $this->attributeNameMatcher->matches( $attribute->name ) ) {
				return true;
			}
		}

		return false;
	}

}