<?php
namespace MazlanHalim\IntelliLanz\Graph;

/** Exact, reviewed plugin-file relationships only. No names, authors or prefix matching. */
final class KnownEcosystemRelationshipProvider {
    /** @return array<int, array{source:string,target:string,relationship:string,evidence:string}> */
    public function relationships( Graph $graph ): array {
        $nodes = array();
        foreach ( $graph->jsonSerialize()['nodes'] as $node ) { $nodes[ $node['id'] ] = true; }
        $rules = array();
        $hotel = $this->onePresent( $nodes, array(
            'plugin:motopress-hotel-booking/motopress-hotel-booking.php',
            'plugin:motopress-hotel-booking-lite/motopress-hotel-booking.php',
        ) );
        if ( $hotel !== null ) {
            foreach ( array(
                'plugin:mphb-mailchimp/mphb-mailchimp.php',
                'plugin:mphb-checkout-fields/mphb-checkout-fields.php',
                'plugin:mphb-multi-currency/mphb-multi-currency.php',
                'plugin:mphb-notifier/mphb-notifier.php',
                'plugin:mphb-payment-request/mphb-payment-request.php',
                'plugin:mphb-invoices/mphb-invoices.php',
                'plugin:mphb-reviews/mphb-reviews.php',
                'plugin:mphb-styles/mphb-styles.php',
                'plugin:mphb-elementor/mphb-elementor.php',
                'plugin:mphb-woocommerce/mphb-woocommerce.php',
                'plugin:mphb-woocommerce-payments/mphb-woocommerce-payments.php',
            ) as $extension ) {
                if ( isset( $nodes[ $extension ] ) ) { $rules[] = $this->rule( $extension, $hotel, 'extends' ); }
            }
            foreach ( array( 'plugin:mphb-woocommerce/mphb-woocommerce.php', 'plugin:mphb-woocommerce-payments/mphb-woocommerce-payments.php' ) as $bridge ) {
                if ( isset( $nodes[ $bridge ], $nodes['plugin:woocommerce/woocommerce.php'] ) ) {
                    $rules[] = $this->rule( $bridge, 'plugin:woocommerce/woocommerce.php', 'integrates_with' );
                }
            }
            if ( isset( $nodes['plugin:mphb-elementor/mphb-elementor.php'], $nodes['plugin:elementor/elementor.php'] ) ) {
                $rules[] = $this->rule( 'plugin:mphb-elementor/mphb-elementor.php', 'plugin:elementor/elementor.php', 'integrates_with' );
            }
        }
        $themeRules = array(
            'theme:salient' => array(
                'plugin:salient-core/salient-core.php', 'plugin:salient-portfolio/salient-portfolio.php',
                'plugin:salient-widgets/salient-widgets.php', 'plugin:salient-shortcodes/salient-shortcodes.php',
                'plugin:salient-home-slider/salient-home-slider.php', 'plugin:salient-wpbakery/salient-wpbakery.php',
            ),
            'theme:hoteller' => array(
                'plugin:hoteller-elementor/hoteller-elementor.php', 'plugin:hoteller-custom-post-type/hoteller-custom-post-type.php',
            ),
        );
        foreach ( $themeRules as $theme => $plugins ) {
            if ( ! isset( $nodes[ $theme ] ) ) { continue; }
            foreach ( $plugins as $plugin ) {
                if ( isset( $nodes[ $plugin ] ) ) { $rules[] = $this->rule( $plugin, $theme, 'extends' ); }
            }
        }
        return $rules;
    }

    private function onePresent( array $nodes, array $candidates ): ?string {
        $found = array_values( array_filter( $candidates, static function ( $id ) use ( $nodes ) { return isset( $nodes[ $id ] ); } ) );
        return count( $found ) === 1 ? $found[0] : null;
    }

    private function rule( string $source, string $target, string $relationship ): array {
        return compact( 'source', 'target', 'relationship' ) + array( 'evidence' => 'known_ecosystem_mapping' );
    }
}