<?php
/**
 * Local-only Smart Optimize report without visitor tracking or remote tests.
 *
 * @package NBHPerformance
 */

namespace NBH\Performance\Modules\Intelligence;

use NBH\Performance\Modules\PerformanceIntelligence\UnifiedMetricsService;

/**
 * Build a report from configuration and local cache evidence.
 */
final class PerformanceReportService {
	/** @var UnifiedMetricsService */
	private $metrics;

	/**
	 * @param UnifiedMetricsService $metrics Local metrics service.
	 */
	public function __construct( UnifiedMetricsService $metrics ) {
		$this->metrics = $metrics;
	}

	/**
	 * @param array<string,mixed> $run Smart Optimize run data.
	 * @return array<string,mixed>
	 */
	public function report( array $run = array() ) {
		$before   = isset( $run['before'] ) && is_array( $run['before'] ) ? $run['before'] : array();
		$after    = isset( $run['after'] ) && is_array( $run['after'] ) ? $run['after'] : $this->metrics->snapshot();
		$features = isset( $run['updated_features'] ) ? count( (array) $run['updated_features'] ) : 0;

		return array(
			'generated_at' => time(),
			'run_id'       => isset( $run['id'] ) ? sanitize_text_field( $run['id'] ) : '',
			'mode'         => isset( $run['mode'] ) ? sanitize_key( $run['mode'] ) : '',
			'status'       => isset( $run['status'] ) ? sanitize_key( $run['status'] ) : 'not_started',
			'before'       => $before,
			'after'        => $after,
			'delta'        => array( 'health' => null ),
			'summary'      => array(
				'headline'         => sprintf(
					/* translators: %d: number of features configured. */
					_n( '%d feature configured', '%d features configured', $features, 'nbh-performance' ),
					$features
				),
				'measurement_note' => __( 'This is local configuration and cache evidence, not a Lighthouse or real-user speed measurement.', 'nbh-performance' ),
			),
			'cache'        => (array) get_option( 'nbh_performance_cache_stats', array() ),
			// The original JPEG/PNG files are preserved; source-byte savings are zero.
			'image_savings' => 0,
			'validation'   => isset( $run['validation'] ) && is_array( $run['validation'] ) ? $run['validation'] : (array) get_option( 'nbh_performance_last_staging_validation', array() ),
			'rollbacks'    => array_slice( (array) get_option( 'nbh_performance_automatic_rollback_history', array() ), 0, 10 ),
			'evidence'     => array(
				'baseline_available' => ! empty( $before ),
				'source'             => 'local_configuration',
			),
		);
	}
}