<?php
namespace MazlanHalim\IntelliLanz\Analysis;

use MazlanHalim\IntelliLanz\Graph\GraphBuilder;
use MazlanHalim\IntelliLanz\Graph\SemanticGrouper;

final class AnalysisService {
    private GraphBuilder $builder;
    private SemanticGrouper $grouper;
    private SiteHealthCollector $collector;
    private SiteHealthPresenter $presenter;
    private AnalysisStore $store;
    private AcknowledgementStore $acknowledgements;

    public function __construct( GraphBuilder $builder, SemanticGrouper $grouper, SiteHealthCollector $collector, SiteHealthPresenter $presenter, AnalysisStore $store, ?AcknowledgementStore $acknowledgements = null ) {
        $this->builder = $builder; $this->grouper = $grouper; $this->collector = $collector; $this->presenter = $presenter; $this->store = $store; $this->acknowledgements = $acknowledgements ?? new AcknowledgementStore();
    }

    public function latest(): ?array { return $this->store->get(); }
    public function history(): array { return $this->store->getHistory(); }

    public function run(): array {
        $limitations = array();
        $site = $this->collector->collect();
        $limitations = array_merge( $limitations, $site['limitations'] );
        $environment = function_exists( 'wp_get_environment_type' ) ? wp_get_environment_type() : 'production';
        $site_health = array();
        foreach ( $site['results'] as $result ) { $site_health[] = $this->presenter->present( $result, $environment ); }
        $graph = array( 'nodes' => array(), 'edges' => array() );
        try {
            $graph = $this->grouper->group( $this->builder->build( true ) )->jsonSerialize();
        } catch ( \Throwable $error ) {
            $limitations[] = array( 'source' => 'intellilanz', 'test' => 'component_graph', 'title' => 'Component analysis', 'message' => 'Component and relationship analysis could not complete.', 'affects_confidence' => true );
        }
        $this->applyAcknowledgements( $graph, $site_health );
        $summary = $this->summarize( $graph, $site_health, $limitations );
        $analysis = array(
            'schema' => 1,
            'analyzed_at' => time(),
            'environment' => $environment,
            'graph' => $graph,
            'site_health' => $site_health,
            'summary' => $summary,
            'limitations' => array_values( $limitations ),
            'completed_stages' => array_values( array_filter( array(
                count( $site_health ) ? 'WordPress Site Health checked' : null,
                count( $graph['nodes'] ) ? 'Components and environment checked' : null,
                count( $graph['edges'] ) ? 'Relationships mapped' : null,
                'Results prepared',
            ) ) ),
        );
        $this->store->set( $analysis );
        $this->store->pushHistory( $analysis );
        return $analysis;
    }

    private function applyAcknowledgements( array &$graph, array &$site_health ): void {
        $stored = $this->acknowledgements->all(); $now = time();
        $mark = function ( array &$finding, string $key, int $severity ) use ( &$stored, $now ): void {
            $finding['finding_key'] = $key; $finding['acknowledged'] = false; $finding['acknowledged_until'] = null;
            $item = $stored[ $key ] ?? null;
            if ( ! is_array( $item ) ) { return; }
            if ( ( is_int( $item['until'] ?? null ) && $item['until'] < $now ) || $severity > (int) ( $item['severity'] ?? $severity ) ) { $this->acknowledgements->clear( $key ); unset( $stored[ $key ] ); return; }
            $finding['acknowledged'] = true; $finding['acknowledged_until'] = $item['until'] ?? null;
        };
        foreach ( $site_health as &$result ) {
            $status = $result['effective_status'] ?? $result['native_status'] ?? '';
            $subject = (string) ( $result['subject'] ?? $result['test'] ?? 'general' );
            $mark( $result, (string) ( $result['test'] ?? 'site_health' ) . ':' . $subject, array( 'good' => 0, 'recommended' => 2, 'critical' => 3 )[ $status ] ?? 1 );
        }
        unset( $result );
        foreach ( $graph['nodes'] as &$node ) {
            $metadata = (array) ( $node['metadata'] ?? array() ); $health = (array) ( $metadata['health'] ?? array() ); $findings = is_array( $health['findings'] ?? null ) ? $health['findings'] : array();
            foreach ( $findings as &$finding ) {
                $subject = (string) ( $finding['subject'] ?? array( 'wordpress' => 'core', 'plugin' => 'plugins', 'theme' => 'themes', 'php' => 'php' )[ $node['type'] ?? '' ] ?? $node['type'] ?? 'component' );
                $component = (string) ( $metadata['stylesheet'] ?? $metadata['file'] ?? $node['id'] ?? 'component' );
                $component = trim( preg_replace( '/[^a-z0-9_-]+/i', ':', preg_replace( '/\.php$/i', '', $component ) ), ':' );
                $mark( $finding, (string) ( $finding['code'] ?? 'finding' ) . ':' . $subject . ':' . $component, (int) ( $finding['severity'] ?? $node['severity'] ?? 0 ) );
            }
            unset( $finding ); $health['findings'] = $findings; $metadata['health'] = $health; $node['metadata'] = $metadata;
        }
        unset( $node );
    }

    /** @param array<string, array> $graph @param array<int, array<string, mixed>> $site_health */
    private function summarize( array $graph, array $site_health, array $limitations ): array {
        $summary = array( 'counting' => 2, 'health_checks' => count( $site_health ), 'healthy' => 0, 'recommended' => 0, 'maintenance' => 0, 'critical' => 0, 'operational_problems' => 0, 'review' => 0, 'components' => 0, 'relationships' => count( $graph['edges'] ), 'evaluated' => 0, 'not_evaluated' => 0, 'inactive' => 0 );
        $site_subjects = array();
        foreach ( $site_health as $result ) {
            if ( ! empty( $result['acknowledged'] ) ) { continue; }
            $status = $result['effective_status'] ?? $result['native_status'];
            if ( isset( $result['subject'] ) && in_array( $status, array( 'recommended', 'critical' ), true ) ) { $site_subjects[ $result['subject'] ] = true; }
            if ( $status === 'good' ) { ++$summary['healthy']; }
            elseif ( $status === 'recommended' ) { ++$summary['recommended']; }
            elseif ( $status === 'critical' ) { ++$summary['critical']; }
        }
        foreach ( $graph['nodes'] as $node ) {
            if ( ( $node['type'] ?? null ) === 'group' ) { continue; }
            ++$summary['components'];
            if ( ( $node['status'] ?? null ) === 'unknown' ) { ++$summary['not_evaluated']; }
            else {
                ++$summary['evaluated'];
                if ( ( $node['status'] ?? null ) === 'inactive' ) { ++$summary['inactive']; ++$summary['review']; }
            }
            $node_metadata = (array) ( $node['metadata'] ?? array() );
            $health = (array) ( $node_metadata['health'] ?? array() );
            $findings = $health['findings'] ?? array();
            foreach ( is_array( $findings ) ? $findings : array() as $finding ) {
                if ( ! empty( $finding['acknowledged'] ) ) { continue; }
                $classification = $finding['classification'] ?? '';
                $subject = $finding['subject'] ?? array( 'wordpress' => 'core', 'plugin' => 'plugins', 'theme' => 'themes', 'php' => 'php' )[ $node['type'] ?? '' ] ?? null;
                if ( $subject !== null && isset( $site_subjects[ $subject ] ) && ( $classification === 'maintenance' || $classification === 'compatibility' || preg_match( '/update|version/', (string) ( $finding['code'] ?? '' ) ) ) ) { continue; }
                if ( $classification === 'maintenance' ) { ++$summary['maintenance']; }
                elseif ( $classification === 'configuration' || ( $classification === 'compatibility' && ( $node['status'] ?? null ) !== 'critical' ) ) { ++$summary['recommended']; }
                elseif ( ( $node['status'] ?? null ) === 'critical' ) { ++$summary['critical']; }
                elseif ( in_array( $classification, array( 'runtime', 'security', 'availability' ), true ) ) {
                    if ( (int) ( $finding['severity'] ?? 0 ) >= 2 ) { ++$summary['operational_problems']; }
                    else { ++$summary['review']; }
                }
            }
        }
        $summary['overall'] = $summary['critical'] ? 'Critical' : ( $summary['operational_problems'] ? 'At Risk' : ( $summary['recommended'] || $summary['maintenance'] || $summary['review'] || $limitations ? 'Needs Attention' : 'Healthy' ) );
        return $summary;
    }
}