<?php
/**
 * Accessibility Checker pluign file.
 *
 * @package Accessibility_Checker
 */

/**
 * Compare strings
 *
 * @param string $string1 String to compare.
 * @param string $string2 String to compare.
 * @return boolean
 */
function edac_compare_strings( $string1, $string2 ) {
	/**
	 * Prepare strings for our comparison.
	 *
	 * @param string $content String to prepare.
	 * @return string
	 */
	$prepare_strings = function ( $content ) {
		// Text to remove.
		$remove_text = [
			__( 'permalink of ', 'accessibility-checker' ),
			__( 'permalink to ', 'accessibility-checker' ),
			__( '&nbsp;', 'accessibility-checker' ),
		];

		$content = strtolower( $content );
		$content = str_ireplace( $remove_text, '', $content );
		$content = wp_strip_all_tags( $content );
		$content = trim( $content, " \t\n\r\0\x0B\xC2\xA0" );

		return html_entity_decode( $content );
	};

	return $prepare_strings( $string1 ) === $prepare_strings( $string2 );
}

/**
 * Check if plugin is installed by getting all plugins from the plugins dir
 *
 * @param string $plugin_slug Slug of the plugin.
 * @return bool
 */
function edac_check_plugin_installed( $plugin_slug ) {
	$installed_plugins = get_plugins();

	return array_key_exists( $plugin_slug, $installed_plugins ) || in_array( $plugin_slug, $installed_plugins, true );
}

/**
 * Convert cardinal number into ordinal number
 *
 * @param int|string $number Number to make ordinal.
 * @return string
 */
function edac_ordinal( $number ) {

	$number = (int) $number;

	if ( class_exists( 'NumberFormatter' ) ) {
		return (
			new NumberFormatter(
				get_locale(),
				NumberFormatter::ORDINAL
			)
		)->format( $number );

	} else {
		if ( $number % 100 >= 11 && $number % 100 <= 13 ) {
			$ordinal = $number . 'th';
		} else {
			switch ( $number % 10 ) {
				case 1:
					$ordinal = $number . 'st';
					break;
				case 2:
					$ordinal = $number . 'nd';
					break;
				case 3:
					$ordinal = $number . 'rd';
					break;
				default:
					$ordinal = $number . 'th';
					break;
			}
		}
		return $ordinal;

	}
}

/**
 * Remove element from multi-dimensional array
 *
 * @param array  $items The multi-dimensional array.
 * @param string $key The key of the element.
 * @param string $value The value of the element.
 * @return array
 */
function edac_remove_element_with_value( $items, $key, $value ) {
	foreach ( $items as $sub_key => $sub_array ) {
		if ( $sub_array[ $key ] === $value ) {
			unset( $items[ $sub_key ] );
		}
	}
	return $items;
}

/**
 * Filter a multi-dimensional array
 *
 * @param array  $items The multi-dimensional array.
 * @param string $index The index of the element.
 * @param string $value The element value to match.
 * @return array
 */
function edac_filter_by_value( $items, $index, $value ) {
	if ( is_array( $items ) && count( $items ) > 0 ) {
		foreach ( array_keys( $items ) as $key ) {
			$temp[ $key ] = $items[ $key ][ $index ];

			if ( $temp[ $key ] === $value ) {
				$newarray[ $key ] = $items[ $key ];
			}
		}
	}

	if ( isset( $newarray ) && is_array( $newarray ) && count( $newarray ) ) {
		return array_values( $newarray );
	}
	return [];
}

/**
 * Get days plugin has been active
 *
 * @return int
 */
function edac_days_active() {
	$activation_date = get_option( 'edac_activation_date' );
	if ( $activation_date ) {
		$diff = strtotime( $activation_date ) - strtotime( gmdate( 'Y-m-d H:i:s' ) );
		return abs( round( $diff / 86400 ) );
	}
	return 0;
}

/**
 * Documentation Link.
 *
 * @param array $rule to get link from.
 * @return string markup for link.
 */
function edac_documentation_link( $rule ) {
	global $wp_version;
	$days_active = edac_days_active();

	if ( ! $rule['info_url'] || ! isset( $rule['slug'] ) ) {
		return '';
	}

	return add_query_arg(
		[
			'utm_source'       => 'accessibility-checker',
			'utm_medium'       => 'software',
			'utm_term'         => esc_attr( $rule['slug'] ),
			'utm_content'      => 'content-analysis',
			'utm_campaign'     => 'wordpress-general',
			'php_version'      => PHP_VERSION,
			'platform'         => 'wordpress',
			'platform_version' => $wp_version,
			'software'         => 'free',
			'software_version' => EDAC_VERSION,
			'days_active'      => $days_active,
		],
		$rule['info_url']
	);
}

/**
 * Custom Post Types
 *
 * @return array
 */
function edac_custom_post_types() {
	$args = [
		'public'   => true,
		'_builtin' => false,
	];

	$output   = 'names'; // names or objects, note names is the default.
	$operator = 'and'; // Options 'and' or 'or'.

	return get_post_types( $args, $output, $operator );
}

/**
 * Available Post Types
 *
 * @return array
 */
function edac_post_types() {
	/**
	 * Filter the post types that the plugin will check.
	 *
	 * @since 1.4.0
	 *
	 * @param array $post_types post types.
	 */
	$post_types = apply_filters( 'edac_filter_post_types', [ 'post', 'page' ] );

	// remove duplicates.
	$post_types = array_unique( $post_types );

	// validate post types.
	foreach ( $post_types as $key => $post_type ) {
		if ( ! post_type_exists( $post_type ) ) {
			unset( $post_types[ $key ] );
		}
	}

	return $post_types;
}

/**
 * This function validates a table name against WordPress naming conventions and checks its existence in the database.
 *
 * The function first checks if the provided table name only contains alphanumeric characters, underscores, or hyphens.
 * If not, it returns null.
 *
 * After that, it checks if a table with that name actually exists in the database using the SHOW TABLES LIKE query.
 * If the table doesn't exist, it also returns null.
 *
 * If both checks are passed, it returns the valid table name.
 *
 * @param string $table_name The name of the table to be validated.
 *
 * @return string|null The validated table name, or null if the table name is invalid or the table does not exist.
 */
function edac_get_valid_table_name( $table_name ) {
	global $wpdb;

	// Check if table name only contains alphanumeric characters, underscores, or hyphens.
	if ( ! preg_match( '/^[a-zA-Z0-9_\-]+$/', $table_name ) ) {
		// Invalid table name.
		return null;
	}

	// Verify that the table actually exists in the database.
	// phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching
	if ( $wpdb->get_var( $wpdb->prepare( 'SHOW TABLES LIKE %s', $table_name ) ) !== $table_name ) {
		// Table does not exist.
		return null;
	}

	return $table_name;
}

/**
 * Upcoming meetups in json format
 *
 * @param string  $meetup meetup name.
 * @param integer $count number of meetups to return.
 * @return json
 */
function edac_get_upcoming_meetups_json( $meetup, $count = 5 ) {

	if ( empty( $meetup ) || ! is_string( $meetup ) ) {
		return;
	}

	// Min of 1 and max of 25.
	$count = absint( max( 1, min( 25, $count ) ) );

	$key    = '_upcoming_meetups__' . sanitize_title( $meetup ) . '__' . (int) $count;
	$output = get_transient( $key );

	if ( false === $output ) {
		$request_uri = 'https://api.meetup.com/gql-ext';
		$query       = '
		query Group {
			groupByUrlname(urlname: "' . (string) $meetup . '") {
				events(first: ' . (int) $count . ') {
					totalCount
					edges {
						node {
							dateTime
							eventUrl
							id
							title
						}
					}
				}
			}
		}';

		// Make POST request with the GraphQL query.
		$request = wp_remote_post(
			$request_uri,
			[
				'headers' => [
					'Content-Type' => 'application/json',
				],
				'body'    => wp_json_encode(
					[
						'query' => $query,
					]
				),
			]
		);

		if ( is_wp_error( $request ) || 200 !== (int) wp_remote_retrieve_response_code( $request ) ) {
			return;
		}

		$response_body = json_decode( wp_remote_retrieve_body( $request ) );

		// Return early if we don't have the expected data.
		if ( empty( $response_body ) || ! isset( $response_body->data->groupByUrlname->events->edges ) ) {
			return;
		}

		// Transform the GraphQL response to match the format expected from old rest response.
		$output = [];
		foreach ( $response_body->data->groupByUrlname->events->edges as $edge ) {
			$event = $edge->node;

			// phpcs:disable WordPress.NamingConventions.ValidVariableName.UsedPropertyNotSnakeCase -- GraphQL response uses camelCase.
			$event_data       = new stdClass();
			$event_data->name = $event->title;
			$event_data->time = strtotime( $event->dateTime ) * 1000; // Convert to milliseconds to match old format.
			$event_data->link = $event->eventUrl;
			$event_data->id   = $event->id;
			// phpcs:enable WordPress.NamingConventions.ValidVariableName.UsedPropertyNotSnakeCase.

			$output[] = $event_data;
		}

		if ( empty( $output ) ) {
			return;
		}

		set_transient( $key, $output, DAY_IN_SECONDS );
	}

	return $output;
}

/**
 * Upcoming meetups in html
 *
 * @param  string  $meetup meetup name.
 * @param  integer $count number of meetups to return.
 * @param  string  $heading heading level.
 * @return json
 */
function edac_get_upcoming_meetups_html( $meetup, $count = 5, $heading = '3' ) {

	$json = edac_get_upcoming_meetups_json( $meetup, $count );

	if ( empty( $json ) ) {
		return;
	}

	$html = '<ul class="edac-upcoming-meetup-list">';

	foreach ( $json as $event ) {
		$link_text = esc_html__( 'Attend Free', 'accessibility-checker' );

		$html .= '
		<li class="edac-upcoming-meetup-item edac-mb-3">
			<h' . esc_html( $heading ) . ' class="edac-upcoming-meetup-item-name">' . esc_html( $event->name ) . '</h' . esc_html( $heading ) . '>
			<div class="edac-upcoming-meetup-item-time edac-timestamp-to-local">' . ( (int) $event->time / 1000 ) . '</div>
			<a aria-label="' . esc_attr( $link_text . ': ' . $event->name ) . '" class="edac-upcoming-meetup-item-link" href="' . esc_url( $event->link ) . '">' . $link_text . '</a>
		</li>';
	}

	$html .= '</ul>';

	return $html;
}

/**
 * Calculate the issue density
 *
 * @param  int $issue_count number of issues.
 * @param  int $element_count number of elements.
 * @param  int $content_length length of content.
 * @return int
 */
function edac_get_issue_density( $issue_count, $element_count, $content_length ) {

	if ( $element_count < 1 || $content_length < 1 ) {
		return 0;
	}

	$element_weight = .8;
	$content_weight = .2;

	$error_elements_percentage = $issue_count / $element_count;
	$error_content_percentage  = $issue_count / $content_length;

	$score = (
		( $error_elements_percentage * $element_weight ) +
		( $error_content_percentage * $content_weight )
	);

	return round( $score * 100, 2 );
}

/**
 * Get simplified summary
 *
 * @param integer $post Post ID.
 * @return void
 */
function edac_get_simplified_summary( $post = null ) {
	if ( null === $post ) {
		$post = get_the_ID();
	}

	if ( null === $post ) {
		return;
	}

	echo wp_kses_post(
		( new \EDAC\Inc\Simplified_Summary() )->simplified_summary_markup( $post )
	);
}

/**
 * Get Post Count by available custom post types
 *
 * @return mixed
 */
function edac_get_posts_count() {

	$output = [];

	$post_types = get_option( 'edac_post_types' );
	if ( $post_types ) {
		foreach ( $post_types as $post_type ) {

			$counts = wp_count_posts( $post_type );

			if ( $counts ) {
				foreach ( $counts as $key => $value ) {
					// phpcs:ignore Universal.Operators.StrictComparisons.LooseEqual
					if ( 0 == $value ) {
						unset( $counts->{$key} );
					}
				}
			}

			if ( $counts ) {
				$array = [];
				foreach ( $counts as $key => $value ) {
					$array[] = $key . ' = ' . $value;
				}
				if ( $array ) {
					$output[] = $post_type . ': ' . implode( ', ', $array );
				}
			}
		}
	}

	if ( $output ) {
		return implode( ', ', $output );
	}
	return false;
}

/**
 * Get Raw Global Error Count
 *
 * @return array
 */
function edac_get_error_count() {
	global $wpdb;

	// Define a unique cache key for our data.
	$cache_key     = 'edac_errors_' . get_current_blog_id();
	$stored_errors = wp_cache_get( $cache_key );

	// Check if the result exists in the cache.
	if ( false === $stored_errors ) {
		// If not, perform the database query.
		$table_name = $wpdb->prefix . 'accessibility_checker';

		// phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery
		$stored_errors = (int) $wpdb->get_var( $wpdb->prepare( 'SELECT count(*) FROM %i WHERE siteid = %d AND ruletype = %s', $table_name, get_current_blog_id(), 'error' ) );

		// Save the result in the cache for future use.
		wp_cache_set( $cache_key, $stored_errors );
	}

	return $stored_errors;
}

/**
 * Get Raw Global Warning Count
 *
 * @return array Array of.
 */
function edac_get_warning_count() {
	global $wpdb;

	// Define a unique cache key for our data.
	$cache_key       = 'edac_warnings_' . get_current_blog_id();
	$stored_warnings = wp_cache_get( $cache_key );

	// Check if the result exists in the cache.
	if ( false === $stored_warnings ) {
		// If not, perform the database query.
		$table_name = $wpdb->prefix . 'accessibility_checker';

		// phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery
		$stored_warnings = (int) $wpdb->get_var( $wpdb->prepare( 'SELECT count(*) FROM %i WHERE siteid = %d AND ruletype = %s', $table_name, get_current_blog_id(), 'warning' ) );

		// Save the result in the cache for future use.
		wp_cache_set( $cache_key, $stored_warnings );
	}

	return $stored_warnings;
}

/**
 * Get Database Table Count
 *
 * @param string $table Database table.
 * @return int
 */
function edac_database_table_count( $table ) {
	global $wpdb;

	// Create a unique cache key based on the table's name.
	$cache_key = 'edac_table_count_' . $table;

	// Try to get the count from the cache first.
	$count = wp_cache_get( $cache_key );

	if ( false === $count ) {
		// If the count is not in the cache, perform the database query.
		// phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery
		$count = $wpdb->get_var( $wpdb->prepare( 'SELECT count(*) FROM %i', $wpdb->prefix . $table ) );

		// Save the count to the cache for future use.
		wp_cache_set( $cache_key, $count );
	}

	return $count;
}

/**
 * Generate a summary statistic list item.
 *
 * @since 1.14.0
 *
 * @param string $item_class     The base CSS class for the list item.
 * @param int    $count     The count of items to display.
 * @param string $label      The translated label with count included.
 *
 * @return string The generated HTML list item.
 */
function edac_generate_summary_stat( string $item_class, int $count, string $label ): string {
	$has_error_class = ( $count > 0 ) ? ' has-errors' : '';

	return '
		<li class="edac-summary-stat ' . $item_class . $has_error_class . '" aria-label="' . $label . '">
			<div class="edac-panel-number">
				' . $count . '
			</div>
			<div class="edac-panel-number-label">' . $label . '</div>
		</li>';
}

/**
 * Generate links to pro page with some params.
 *
 * @param array  $query_args A list of key value pairs to add as query vars to the link.
 * @param string $type The type of link to generate. Default is 'pro'.
 * @param array  $args Additional arguments to pass on the link.
 * @return string
 */
function edac_generate_link_type( $query_args = [], $type = 'pro', $args = [] ): string {

	$date_now        = new DateTime( gmdate( 'Y-m-d H:i:s' ) );
	$activation_date = new DateTime( get_option( 'edac_activation_date', gmdate( 'Y-m-d H:i:s' ) ) );
	$interval        = $date_now->diff( $activation_date );
	$days_active     = $interval->days;
	$query_defaults  = [
		'utm_source'       => 'accessibility-checker',
		'utm_medium'       => 'software',
		'utm_campaign'     => 'wordpress-general',
		'php_version'      => PHP_VERSION,
		'platform'         => 'wordpress',
		'platform_version' => $GLOBALS['wp_version'],
		'software'         => defined( 'EDACP_KEY_VALID' ) && EDACP_KEY_VALID ? 'pro' : 'free',
		'software_version' => defined( 'EDACP_VERSION' ) ? EDACP_VERSION : EDAC_VERSION,
		'days_active'      => $days_active,
	];

	$query_args = array_merge( $query_defaults, $query_args );

	switch ( $type ) {
		case 'help':
			$base_link = trailingslashit( 'https://a11ychecker.com/help' . $args['help_id'] ?? '' );
			break;
		case 'custom': // phpcs:ignore -- intentially only breaking inside the condition because if it's not set we want to hit default.
			if ( $args['base_link'] ) {
				$base_link = $args['base_link'];
				break;
			}
		case 'pro':
		default:
			$base_link = 'https://equalizedigital.com/accessibility-checker/pricing/';
			break;
	}
	return add_query_arg( $query_args, $base_link );
}

/**
 * Check if WooCommerce is enabled.
 *
 * This just checks for existence of the main WooCommerce function and class.
 *
 * @return bool
 */
function edac_is_woocommerce_enabled() {
	return function_exists( 'WC' ) && class_exists( 'WooCommerce' );
}

/**
 * Check if a given post id is the WooCommerce checkout page.
 *
 * @param int $post_id The post ID to check.
 * @return bool
 */
function edac_check_if_post_id_is_woocommerce_checkout_page( $post_id ) {
	if ( ! edac_is_woocommerce_enabled() ) {
		return false;
	}

	return wc_get_page_id( 'checkout' ) === $post_id;
}

/**
 * Parse HTML content to extract image or SVG elements
 * 
 * @param string $html The HTML content to parse.
 * @return array Array containing 'img' (string) and 'svg' (string) keys.
 */
function edac_parse_html_for_media( $html ) {
	if ( empty( $html ) ) {
		return [
			'img' => null,
			'svg' => null,
		];
	}

	// Decode HTML entities before processing.
	$decoded_html = html_entity_decode( $html, ENT_QUOTES | ENT_HTML5 );

	// Early return if no media tags found.
	if ( stripos( $decoded_html, '<img' ) === false && stripos( $decoded_html, '<svg' ) === false ) {
		return [
			'img' => null,
			'svg' => null,
		];
	}

	// More specific img tag regex pattern.
	if ( preg_match( '/<img[^>]+src=([\'"])(.*?)\1[^>]*>/i', $decoded_html, $matches ) ) {
		return [
			'img' => $matches[2] ?? null,
			'svg' => null,
		];
	}

	// SVG pattern remains the same.
	if ( preg_match( '/<svg[^>]*>.*?<\/svg>/is', $decoded_html, $matches ) ) {
		return [
			'img' => null,
			'svg' => $matches[0],
		];
	}

	return [
		'img' => null,
		'svg' => null,
	];
}

/**
 * Remove corrected posts
 *
 * @param int    $post_ID The ID of the post.
 * @param string $type    The type of the post.
 * @param int    $pre     The flag indicating the removal stage (1 for before validation php based rules, 2 for after validation).
 * @param string $ruleset    The type of the ruleset to correct (php or js). For backwards compatibility, defaults to 'php'.
 *
 * @return void
 */
function edac_remove_corrected_posts( $post_ID, $type, $pre = 1, $ruleset = 'php' ) {  // phpcs:ignore Generic.CodeAnalysis.UnusedFunctionParameter.FoundAfterLastUsed, VariableAnalysis.CodeAnalysis.VariableAnalysis.UnusedVariable -- $ruleset is for backwards compatibility.
	global $wpdb;

	$rules = edac_register_rules();

	if ( 0 === count( $rules ) ) {
		return;
	}

	$sql = 1 === $pre
		? "UPDATE {$wpdb->prefix}accessibility_checker SET recordcheck = %d WHERE siteid = %d AND postid = %d AND type = %s"
		: "DELETE FROM {$wpdb->prefix}accessibility_checker WHERE recordcheck = %d AND siteid = %d AND postid = %d AND type = %s";

	// phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching -- Using direct query for adding data to database, caching not required for one time operation.
	$wpdb->query(
		$wpdb->prepare(
			$sql, // phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared, WordPress.DB.PreparedSQL.NotPrepared
			0,
			get_current_blog_id(),
			$post_ID,
			$type
		)
	);
}