<?php
if ( ! defined( 'ABSPATH' ) ) exit;

class WC_AddressZen_Blocks {

    /**
     * Initialize blocks integration.
     */
    public static function init() {
        add_action(
            'woocommerce_blocks_checkout_block_registration',
            array( __CLASS__, 'register_checkout_block_integration' )
        );

        add_action(
            'wp_enqueue_scripts',
            array( __CLASS__, 'maybe_enqueue_block_assets' ),
            20
        );
    }

    /**
     * Register the IntegrationInterface with WooCommerce Blocks.
     *
     * @param \Automattic\WooCommerce\Blocks\Integrations\IntegrationRegistry $integration_registry
     */
    public static function register_checkout_block_integration( $integration_registry ) {
        require_once ADDRESSZEN_DIR . 'classes' . DIRECTORY_SEPARATOR . 'class-addresszen-blocks-integration.php';
        $integration_registry->register( new WC_AddressZen_Blocks_Integration() );
    }

    /**
     * Enqueue block assets on checkout pages as a fallback.
     * Only enqueues if the IntegrationInterface didn't already register scripts.
     */
    public static function maybe_enqueue_block_assets() {
        if ( ! self::is_block_checkout() ) {
            return;
        }

        // Skip if the integration already enqueued the script
        if ( wp_script_is( 'addresszen-blocks-frontend', 'enqueued' ) ) {
            return;
        }

        require_once ADDRESSZEN_DIR . 'classes' . DIRECTORY_SEPARATOR . 'class-addresszen-blocks-integration.php';

        $settings = WC_AddressZen_Blocks_Integration::build_settings();

        if ( empty( $settings['enabled'] ) || empty( $settings['apiKey'] ) ) {
            return;
        }

        // Register and enqueue script
        $script_path = ADDRESSZEN_DIR . 'js/blocks/checkout-blocks-frontend.asset.php';
        $script_asset = file_exists( $script_path )
            ? require $script_path
            : array( 'dependencies' => array(), 'version' => ADDRESSZEN_VERSION );

        wp_enqueue_script(
            'addresszen-blocks-frontend',
            ADDRESSZEN_URL . 'js/blocks/checkout-blocks-frontend.js',
            $script_asset['dependencies'],
            $script_asset['version'],
            true
        );

        // Pass settings via inline script (dual approach)
        wp_add_inline_script(
            'addresszen-blocks-frontend',
            'window.wcSettings = window.wcSettings || {};' .
            'window.wcSettings["addresszen_data"] = ' . wp_json_encode( $settings ) . ';',
            'before'
        );

        // Enqueue styles
        wp_enqueue_style(
            'addresszen-blocks-style',
            ADDRESSZEN_URL . 'css/addresszen.css',
            array(),
            ADDRESSZEN_VERSION
        );
    }

    /**
     * Check if the current page uses WooCommerce block checkout.
     *
     * @return bool
     */
    private static function is_block_checkout() {
        global $post;

        if ( ! $post ) {
            return false;
        }

        return has_block( 'woocommerce/checkout', $post );
    }
}