<?php

namespace WooOrderCart\Front\Checkout;

use WooOrderCart\Front\Checkout\Payments\CheckoutPaymentMethodContextResolver;
use WooOrderCart\Front\Checkout\Portal\Compatibility\CheckoutPortalCompatibilityGate;

class CheckoutBlocksCompatibility {
    /**
     * @return array<string,mixed>
     */
    public static function build(): array {
        $available_gateways = self::available_gateways();
        $block_methods = self::active_block_payment_methods();
        $checkout_page = CheckoutPageInspector::inspect();
        $portal_compatibility = CheckoutPortalCompatibilityGate::build();
        $unsupported = [];

        foreach ( $available_gateways as $gateway ) {
            $id = (string) ( $gateway['id'] ?? '' );

            if ( '' !== $id && ! in_array( $id, $block_methods, true ) ) {
                $unsupported[] = $gateway;
            }
        }

        return [
            'storeApiAvailable' => CheckoutStoreApiClient::is_available(),
            'blocksPaymentRegistryAvailable' => class_exists( '\Automattic\WooCommerce\Blocks\Payments\PaymentMethodRegistry' ),
            'checkoutPage' => $checkout_page,
            'checkoutPageStatus' => $checkout_page['status'] ?? CheckoutPageInspector::STATUS_UNKNOWN,
            'canUseReactPortal' => CheckoutPageInspector::STATUS_BLOCK_CHECKOUT === ( $checkout_page['status'] ?? '' )
                && ! empty( $portal_compatibility['canUsePortal'] ),
            'portalCapability' => (string) ( $portal_compatibility['capability'] ?? 'native_woo_fallback' ),
            'portalFallbackReason' => (string) ( $portal_compatibility['reason'] ?? '' ),
            'portalCompatibility' => $portal_compatibility,
            'availableGateways' => $available_gateways,
            'activeBlockPaymentMethods' => $block_methods,
            'possiblyUnsupportedGateways' => $unsupported,
        ];
    }

    /**
     * @return array<int,array{id:string,title:string}>
     */
    private static function available_gateways(): array {
        if ( ! function_exists( 'WC' ) || ! WC()->payment_gateways() ) {
            return [];
        }

        $gateways = [];

        foreach ( WC()->payment_gateways()->get_available_payment_gateways() as $gateway ) {
            if ( ! is_object( $gateway ) || empty( $gateway->id ) ) {
                continue;
            }

            $title = (string) ( $gateway->title ?? '' );
            if ( '' === $title && isset( $gateway->method_title ) ) {
                $title = (string) $gateway->method_title;
            }

            $gateways[] = [
                'id' => (string) $gateway->id,
                'title' => wp_strip_all_tags( '' !== $title ? $title : (string) $gateway->id ),
            ];
        }

        return $gateways;
    }

    /**
     * @return array<int,string>
     */
    private static function active_block_payment_methods(): array {
        return CheckoutPaymentMethodContextResolver::active_block_payment_method_ids();
    }
}