Add error count summary to plugin check UI

assets/js/plugin-check-admin.js

@@ -218,6 +218,46 @@
 		return false;
 	}
 
+	/**
+	 * Counts the total number of errors and warnings in the aggregated results.
+	 *
+	 * @since 1.9.0
+	 *
+	 * @return {Object} Object with errorCount and warningCount properties.
+	 */
+	function countResults() {
+		let errorCount = 0;
+		let warningCount = 0;
+
+		// Count errors.
+		for ( const file of Object.keys( aggregatedResults.errors ) ) {
+			const lines = aggregatedResults.errors[ file ] || {};
+
+			for ( const line of Object.keys( lines ) ) {
+				const columns = lines[ line ] || {};
+
+				for ( const column of Object.keys( columns ) ) {
+					errorCount += ( columns[ column ] || [] ).length;
+				}
+			}
+		}
+
+		// Count warnings.
+		for ( const file of Object.keys( aggregatedResults.warnings ) ) {
+			const lines = aggregatedResults.warnings[ file ] || {};
+
+			for ( const line of Object.keys( lines ) ) {
+				const columns = lines[ line ] || {};
+
+				for ( const column of Object.keys( columns ) ) {
+					warningCount += ( columns[ column ] || [] ).length;
+				}
+			}
+		}
+
+		return { errorCount, warningCount };
+	}
+
 	function defaultString( key ) {
 		if (
 			pluginCheck.strings &&
@@ -544,10 +584,91 @@
 	 * @param {boolean} isSuccessMessage Whether the message is a success message.
 	 */
 	function renderResultsMessage( isSuccessMessage ) {
-		const messageType = isSuccessMessage ? 'success' : 'error';
-		const messageText = isSuccessMessage
-			? pluginCheck.successMessage
-			: pluginCheck.errorMessage;
+		// Count errors and warnings to determine notice severity and compose the message.
+		const { errorCount, warningCount } = isSuccessMessage
+			? { errorCount: 0, warningCount: 0 }
+			: countResults();
+
+		// Derive notice type from actual counts: errors → error, warnings-only → warning, none → success.
+		let messageType;
+		if ( errorCount > 0 ) {
+			messageType = 'error';
+		} else if ( warningCount > 0 ) {
+			messageType = 'warning';
+		} else {
+			messageType = 'success';
+		}
+
+		let messageText;
+
+		if ( isSuccessMessage ) {
+			messageText = pluginCheck.successMessage;
+		} else {
+			/**
+			 * Substitutes printf-style placeholders in a translated string.
+			 * Handles both simple (%d, %s) and positional (%1$d, %2$s) placeholders.
+			 *
+			 * @param {string}    template The translated format string.
+			 * @param {...string} args     Replacement values.
+			 * @return {string} Formatted string with placeholders replaced.
+			 */
+			function sprintfReplace( template, ...args ) {
+				let i = 0;
+				return template.replace(
+					/%(\d+\$)?[ds]/g,
+					function ( _match, pos ) {
+						const index = pos ? parseInt( pos, 10 ) - 1 : i++;
+						return args[ index ] !== undefined
+							? args[ index ]
+							: _match;
+					}
+				);
+			}
+
+			// Build the individual count parts with proper plural/singular forms.
+			let errorPart = '';
+			if ( errorCount > 0 ) {
+				errorPart = sprintfReplace(
+					errorCount === 1
+						? pluginCheck.errorString
+						: pluginCheck.errorsString,
+					errorCount
+				);
+			}
+
+			let warningPart = '';
+			if ( warningCount > 0 ) {
+				warningPart = sprintfReplace(
+					warningCount === 1
+						? pluginCheck.warningString
+						: pluginCheck.warningsString,
+					warningCount
+				);
+			}
+
+			// Assemble the final sentence from fully translatable PHP-provided templates
+			// so that word order and connector phrases can be adapted for all languages.
+			if ( errorPart && warningPart ) {
+				messageText = sprintfReplace(
+					pluginCheck.summaryBothTemplate,
+					errorPart,
+					warningPart
+				);
+			} else if ( errorPart ) {
+				messageText = sprintfReplace(
+					pluginCheck.summarySingleTemplate,
+					errorPart
+				);
+			} else if ( warningPart ) {
+				messageText = sprintfReplace(
+					pluginCheck.summarySingleTemplate,
+					warningPart
+				);
+			} else {
+				// Fallback to default message if somehow no errors/warnings.
+				messageText = pluginCheck.errorMessage;
+			}
+		}
 
 		resultsContainer.innerHTML =
 			renderTemplate( 'plugin-check-results-complete', {

includes/Admin/Admin_Page.php

@@ -204,6 +204,18 @@ public function enqueue_scripts() {
 					'actionExportResults'             => Admin_AJAX::ACTION_EXPORT_RESULTS,
 					'successMessage'                  => __( 'No errors found.', 'plugin-check' ),
 					'errorMessage'                    => __( 'Errors were found.', 'plugin-check' ),
+					/* translators: %d: Number of errors found. */
+					'errorString'                     => __( '%d error', 'plugin-check' ),
+					/* translators: %d: Number of errors found. */
+					'errorsString'                    => __( '%d errors', 'plugin-check' ),
+					/* translators: %d: Number of warnings found. */
+					'warningString'                   => __( '%d warning', 'plugin-check' ),
+					/* translators: %d: Number of warnings found. */
+					'warningsString'                  => __( '%d warnings', 'plugin-check' ),
+					/* translators: 1: Formatted error count string (e.g. "3 errors"), 2: Formatted warning count string (e.g. "2 warnings"). */
+					'summaryBothTemplate'             => __( '%1$s and %2$s found.', 'plugin-check' ),
+					/* translators: %s: Formatted issue count string (e.g. "3 errors" or "2 warnings"). */
+					'summarySingleTemplate'           => __( '%s found.', 'plugin-check' ),
 					'strings'                         => array(
 						'exportCsv'      => __( 'Export CSV', 'plugin-check' ),
 						'exportJson'     => __( 'Export JSON', 'plugin-check' ),