<?php
namespace MazlanHalim\IntelliLanz\Detection;

use MazlanHalim\IntelliLanz\Graph\Edge;
use MazlanHalim\IntelliLanz\Graph\Node;

/** Map exact, known plugin files to one operational integration node. */
final class PluginIntegrationDetector implements DetectorInterface {
    private string $id;
    private string $label;
    private string $category;
    private array $providers;

    public function __construct( string $id, string $label, string $category, array $providers ) {
        if ( ! preg_match( '/^[a-z0-9-]+$/D', $id ) || trim( $label ) === '' || ! preg_match( '/^[a-z0-9-]+$/D', $category ) ) {
            throw new \InvalidArgumentException( 'Integration identity is invalid.' );
        }
        foreach ( $providers as $file => $provider_label ) {
            if ( ! is_string( $file ) || ! preg_match( '#^[A-Za-z0-9][A-Za-z0-9._-]*(?:/[A-Za-z0-9][A-Za-z0-9._-]*)*\.php$#D', $file ) || ! is_string( $provider_label ) || trim( $provider_label ) === '' ) {
                throw new \InvalidArgumentException( 'Integration provider is invalid.' );
            }
        }
        $this->id = $id;
        $this->label = $label;
        $this->category = $category;
        $this->providers = $providers;
    }

    public function detect(): array {
        if ( ! function_exists( 'get_plugins' ) ) {
            require_once ABSPATH . 'wp-admin/includes/plugin.php';
        }
        $installed = get_plugins();
        $found = array();
        $edges = array();
        foreach ( $this->providers as $file => $label ) {
            if ( ! is_string( $file ) || ! isset( $installed[ $file ] ) ) { continue; }
            $active = is_plugin_active( $file );
            $found[] = array( 'file' => $file, 'label' => sanitize_text_field( $label ), 'active' => $active );
            $edges[] = new Edge( 'edge:integration:' . $this->id . ':' . hash( 'sha256', $file ), 'plugin:' . $file, 'integration:' . $this->id, 'provides', 'high', array( 'evidence' => 'integration_detector' ) );
        }
        if ( $found === array() ) { return array( 'nodes' => array(), 'edges' => array() ); }
        return array(
            'nodes' => array( new Node( 'integration:' . $this->id, 'integration', $this->category, sanitize_text_field( $this->label ), 'unknown', 0, array( 'providers' => $found, 'active' => count( array_filter( $found, static function ( array $provider ): bool { return $provider['active']; } ) ) > 0 ) ) ),
            'edges' => $edges,
        );
    }
}