<?php
/**
 * Accesswell_Settings
 *
 * Site options, and issues people have reviewed and chosen to ignore.
 *
 * @package Accesswell
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

class Accesswell_Settings {

	const OPTION        = 'accesswell_settings';
	const IGNORE_OPTION = 'accesswell_ignored';

	/**
	 * @return array {
	 *     post_types: array Types the site scan visits (empty = all public).
	 *     max_pages:  int   Pages per site scan.
	 *     skip_rules: array Rules that are turned off.
	 *     auto:       bool  Check pages automatically while editors browse the site.
	 * }
	 */
	public static function get() {
		$saved = get_option( self::OPTION, array() );
		$saved = is_array( $saved ) ? $saved : array();

		return array(
			'post_types' => isset( $saved['post_types'] ) && is_array( $saved['post_types'] ) ? array_values( array_map( 'sanitize_key', $saved['post_types'] ) ) : array(),
			'max_pages'  => isset( $saved['max_pages'] ) ? max( 1, min( 2000, (int) $saved['max_pages'] ) ) : 200,
			'skip_rules' => isset( $saved['skip_rules'] ) && is_array( $saved['skip_rules'] ) ? array_values( array_map( 'sanitize_key', $saved['skip_rules'] ) ) : array(),
			'auto'       => isset( $saved['auto'] ) ? (bool) $saved['auto'] : true,
		);
	}

	/**
	 * @param array $input Submitted values.
	 */
	public static function save( array $input ) {
		$public = get_post_types( array( 'public' => true ), 'names' );
		unset( $public['attachment'] );

		$types = isset( $input['post_types'] ) && is_array( $input['post_types'] ) ? array_values( array_intersect( array_map( 'sanitize_key', $input['post_types'] ), $public ) ) : array();
		$rules = isset( $input['skip_rules'] ) && is_array( $input['skip_rules'] ) ? array_values( array_intersect( array_map( 'sanitize_key', $input['skip_rules'] ), array_keys( Accesswell_Rules::all() ) ) ) : array();

		update_option(
			self::OPTION,
			array(
				'post_types' => count( $types ) === count( $public ) ? array() : $types,
				'max_pages'  => isset( $input['max_pages'] ) ? max( 1, min( 2000, (int) $input['max_pages'] ) ) : 200,
				'skip_rules' => $rules,
				'auto'       => ! empty( $input['auto'] ),
			),
			false
		);
	}

	/**
	 * Post types the site scan visits.
	 *
	 * @return array
	 */
	public static function post_types() {
		$public = get_post_types( array( 'public' => true ), 'names' );
		unset( $public['attachment'] );
		$chosen = self::get()['post_types'];
		return $chosen ? array_values( array_intersect( $chosen, $public ) ) : array_values( $public );
	}

	// ------------------------------------------------------------------
	// Ignored issues
	// ------------------------------------------------------------------

	/**
	 * Key of an ignored issue. With no path it applies to every page (for
	 * example a footer that appears everywhere).
	 *
	 * @param string $rule     Rule ID.
	 * @param string $selector CSS path of the element.
	 * @param string $path     Page path, or '' for every page.
	 * @return string
	 */
	public static function ignore_key( $rule, $selector, $path ) {
		return md5( $rule . '|' . $selector . '|' . $path );
	}

	/**
	 * @return array Key => { rule, selector, path, snippet, user, time }.
	 */
	public static function ignored() {
		$all = get_option( self::IGNORE_OPTION, array() );
		return is_array( $all ) ? $all : array();
	}

	/**
	 * @param array $issue { rule, selector, path, snippet }.
	 */
	public static function ignore( array $issue ) {
		$all = self::ignored();
		$key = self::ignore_key( $issue['rule'], $issue['selector'], $issue['path'] );

		$all[ $key ] = array(
			'rule'     => $issue['rule'],
			'selector' => $issue['selector'],
			'path'     => $issue['path'],
			'snippet'  => $issue['snippet'],
			'user'     => get_current_user_id(),
			'time'     => time(),
		);
		update_option( self::IGNORE_OPTION, $all, false );
		return $key;
	}

	/**
	 * @param string $key Ignore key.
	 */
	public static function unignore( $key ) {
		$all = self::ignored();
		unset( $all[ $key ] );
		update_option( self::IGNORE_OPTION, $all, false );
	}

	/**
	 * Whether an issue on a page is ignored.
	 *
	 * @param array  $issue Issue with rule and selector.
	 * @param string $path  Page path.
	 * @param array  $all   Ignored list.
	 * @return bool
	 */
	public static function is_ignored( $issue, $path, $all ) {
		return isset( $all[ self::ignore_key( $issue['rule'], $issue['selector'], $path ) ] ) || isset( $all[ self::ignore_key( $issue['rule'], $issue['selector'], '' ) ] );
	}
}