<?php
/**
 * Form rules.
 *
 * @package A11yMate
 */

namespace A11yMate\Rules\Server;

use A11yMate\Rules\Registry;
use A11yMate\Support\Html;

defined( 'ABSPATH' ) || exit;

/**
 * Labels, autocomplete, groups, required.
 */
class Forms {

	/**
	 * Run the checks.
	 *
	 * @param Context $c Context.
	 * @return void
	 */
	public function run( Context $c ) {
		$phrases  = Registry::phrases();
		$controls = $c->q( "//input[not(translate(@type,'HIDENSUBMTRCLOKFY','hidensubmtrcloky')='hidden' or translate(@type,'SUBMIT','submit')='submit' or translate(@type,'BUTON','buton')='button' or translate(@type,'RESET','reset')='reset' or translate(@type,'IMAGE','image')='image')] | //select | //textarea" );
		$labels   = array();
		foreach ( $c->q( '//label[@for]' ) as $l ) {
			if ( '' !== Html::clean( Html::text_of( $l ) ) ) {
				$labels[ $l->getAttribute( 'for' ) ][] = $l;
			}
		}

		$radios = array();
		$checks = array();

		foreach ( $controls as $in ) {
			if ( Html::is_hidden( $in ) || 'true' === $in->getAttribute( 'aria-hidden' ) || $in->hasAttribute( 'disabled' ) ) {
				continue;
			}
			$tag  = strtolower( $in->tagName );
			$type = strtolower( $in->getAttribute( 'type' ) );
			$id   = $in->getAttribute( 'id' );

			$label_text = '';
			if ( '' !== $id && isset( $labels[ $id ] ) ) {
				$label_text = Html::clean( Html::text_of( $labels[ $id ][0] ) );
			}
			$wrap = $c->q( 'ancestor::label[1]', $in );
			if ( $wrap && '' === $label_text ) {
				$label_text = Html::clean( Html::text_of( $wrap[0] ) );
			}
			$aria = trim( $in->getAttribute( 'aria-label' ) ) . trim( $in->getAttribute( 'aria-labelledby' ) );
			$name = '' !== $label_text || '' !== $aria || '' !== trim( $in->getAttribute( 'title' ) );

			if ( ! $name ) {
				if ( '' !== trim( $in->getAttribute( 'placeholder' ) ) ) {
					$c->add( 'input-placeholder-only', $in );
				} else {
					$c->add( 'input-no-label', $in );
				}
			}

			if ( 'radio' === $type ) {
				$radios[ $in->getAttribute( 'name' ) ][] = $in;
			}
			if ( 'checkbox' === $type ) {
				$checks[ $in->getAttribute( 'name' ) ][] = $in;
			}

			// Autocomplete on personal data fields.
			if ( 'select' !== $tag && ! in_array( $type, array( 'radio', 'checkbox', 'file', 'search', 'range', 'color' ), true ) ) {
				$ac = strtolower( trim( $in->getAttribute( 'autocomplete' ) ) );
				if ( '' === $ac || 'off' === $ac ) {
					$key   = strtolower( preg_replace( '/[\[\]]/', '', $in->getAttribute( 'name' ) ) );
					$idkey = strtolower( $id );
					$map   = $phrases['personalAutocomplete'];
					$token = '';
					if ( 'email' === $type ) {
						$token = 'email';
					} elseif ( 'tel' === $type ) {
						$token = 'tel';
					} elseif ( isset( $map[ $key ] ) ) {
						$token = $map[ $key ];
					} elseif ( isset( $map[ $idkey ] ) ) {
						$token = $map[ $idkey ];
					}
					if ( '' !== $token && 'textarea' !== $tag ) {
						$c->add( 'input-autocomplete-missing', $in, array( 'suggested' => $token ) );
					}
				}
			}

			// Required only shown visually.
			if ( '' !== $label_text && ! $in->hasAttribute( 'required' ) && 'true' !== $in->getAttribute( 'aria-required' ) ) {
				if ( preg_match( '/\*|\(required\)|\brequired\b/i', $label_text ) ) {
					$c->add( 'required-not-programmatic', $in );
				}
			}
		}

		foreach ( array( $radios, $checks ) as $set ) {
			foreach ( $set as $name => $group ) {
				$multi = count( $group ) > 1 && '' !== $name;
				if ( ! $multi ) {
					continue;
				}
				$first = $group[0];
				if ( ! $c->q( "ancestor::fieldset | ancestor::*[@role='group' or @role='radiogroup']", $first ) ) {
					$c->add( 'group-no-fieldset', $first, array( 'count' => count( $group ) ) );
				}
			}
		}
	}
}