<?php
/**
 * Transparent SiteAuditHub estimate scores.
 *
 * Score per module = 100 − Σ deductions, floored at 0.
 * Deduction per check = min( cap, weight × occurrences ), where weight and cap
 * depend on severity. Potential/suspicious findings count half. Manual review,
 * unavailable, failed and informational items do not reduce the score.
 *
 * @package SiteAuditHub
 */

namespace SiteAuditHub;

defined( 'ABSPATH' ) || exit;

/**
 * Scoring.
 */
class Scoring {

	const WEIGHTS = array(
		'critical' => array( 25, 50 ),
		'high'     => array( 8, 24 ),
		'medium'   => array( 3, 12 ),
		'low'      => array( 1, 5 ),
		'info'     => array( 0, 0 ),
	);

	const FULL = array( 'confirmed', 'integrity_mismatch', 'signature_match' );
	const HALF = array( 'potential', 'suspicious', 'unverified' );

	/**
	 * Per-module scores for one scan.
	 *
	 * @param int $scan_id Scan.
	 * @return array module => score
	 */
	public static function for_scan( $scan_id ) {
		$scan = Repository::get_scan( $scan_id );
		if ( ! $scan ) {
			return array();
		}
		$modules = 'integrity' === $scan->scan_type ? array( 'integrity' ) : array( 'seo', 'a11y', 'health', 'plugins' );
		$out     = array();
		foreach ( $modules as $module ) {
			$deduct = 0.0;
			foreach ( Repository::check_counts( $scan_id, $module ) as $row ) {
				$factor = in_array( $row->classification, self::FULL, true ) ? 1.0 : ( in_array( $row->classification, self::HALF, true ) ? 0.5 : 0.0 );
				if ( ! $factor || ! isset( self::WEIGHTS[ $row->severity ] ) ) {
					continue;
				}
				list( $weight, $cap ) = self::WEIGHTS[ $row->severity ];
				$deduct              += $factor * min( $cap, $weight * (int) $row->c );
			}
			$out[ $module ] = (int) max( 0, round( 100 - $deduct ) );
		}
		return $out;
	}

	/**
	 * Overall estimate from the latest completed site and integrity scans.
	 *
	 * @return array {overall:int|null, modules: array}
	 */
	public static function overall() {
		$site      = Repository::latest_completed( 'site' );
		$integrity = Repository::latest_completed( 'integrity' );
		$modules   = array();
		if ( $site ) {
			$modules = isset( $site->summary['scores'] ) ? (array) $site->summary['scores'] : self::for_scan( $site->id );
		}
		if ( $integrity ) {
			$scores               = isset( $integrity->summary['scores'] ) ? (array) $integrity->summary['scores'] : self::for_scan( $integrity->id );
			$modules['integrity'] = isset( $scores['integrity'] ) ? $scores['integrity'] : null;
		}
		$weights = array(
			'seo'       => 30,
			'a11y'      => 25,
			'health'    => 20,
			'plugins'   => 10,
			'integrity' => 15,
		);
		$sum     = 0;
		$total   = 0;
		foreach ( $modules as $module => $score ) {
			if ( null !== $score && isset( $weights[ $module ] ) ) {
				$sum   += $weights[ $module ] * $score;
				$total += $weights[ $module ];
			}
		}
		return array(
			'overall' => $total ? (int) round( $sum / $total ) : null,
			'modules' => $modules,
		);
	}
}