<?php

declare(strict_types=1);

namespace Agent001\Frontend;

\defined( 'ABSPATH' ) || exit;

use Agent001\Config\Settings;
use Agent001\Admin\Onboarding;

final class WidgetInjector
{
    private const HANDLE = 'agent001-widget-loader';

    private Settings $settings;

    public function __construct( Settings $settings )
    {
        $this->settings = $settings;
    }

    public function register(): void
    {
        \add_action( 'wp_enqueue_scripts', [ $this, 'enqueue' ], 100 );
        \add_filter( 'script_loader_tag', [ $this, 'addDataAttributes' ], 10, 2 );
    }

    public function enqueue(): void
    {
        if ( \is_admin() || \get_option( Onboarding::OPTION, '' ) !== 'complete' ) {
            return;
        }

        $token = $this->settings->selectedAgentEmbedToken();
        if ( $token === '' || ! $this->settings->selectedAgentIsActive() ) {
            return;
        }

        if ( ! \apply_filters( 'agent001_render_widget', true ) ) {
            return;
        }

        $loaderUrl = $this->settings->widgetLoaderUrl();
        if ( ! $this->isLoaderUrlAllowed( $loaderUrl ) ) {
            return;
        }

        $version = \defined( 'AGENT001_VERSION' ) ? \AGENT001_VERSION : '1.0.0';

        \wp_enqueue_script(
            self::HANDLE,
            $loaderUrl,
            [],
            $version,
            true
        );
    }

    private function isLoaderUrlAllowed( string $loaderUrl ): bool
    {
        if ( $loaderUrl === '' ) {
            return false;
        }

        $loaderHost = \wp_parse_url( $loaderUrl, PHP_URL_HOST );
        if ( ! is_string( $loaderHost ) || $loaderHost === '' ) {
            return false;
        }

        $loaderScheme = \wp_parse_url( $loaderUrl, PHP_URL_SCHEME );
        if ( $loaderScheme !== 'https' ) {
            return false;
        }

        $backendHost = \wp_parse_url( $this->settings->backendBaseUrl(), PHP_URL_HOST );
        if ( ! is_string( $backendHost ) || $backendHost === '' ) {
            return false;
        }

        if ( strcasecmp( $loaderHost, $backendHost ) === 0 ) {
            return true;
        }

        $allowed = \apply_filters( 'agent001_allowed_widget_hosts', [], $loaderUrl );
        if ( is_array( $allowed ) ) {
            foreach ( $allowed as $candidate ) {
                if ( is_string( $candidate ) && strcasecmp( $candidate, $loaderHost ) === 0 ) {
                    return true;
                }
            }
        }

        return false;
    }

    public function addDataAttributes( string $tag, string $handle ): string
    {
        if ( $handle !== self::HANDLE ) {
            return $tag;
        }

        $token     = $this->settings->selectedAgentEmbedToken();
        $widgetKey = $this->settings->widgetKey();
        $pluginUrl = \rest_url( 'agent001/v1' );

        $attrs = sprintf(
            ' data-token="%s" data-plugin-key="%s" data-plugin-rest="%s"',
            \esc_attr( $token ),
            \esc_attr( $widgetKey ),
            \esc_url( $pluginUrl )
        );

        return preg_replace( '/(<script\b)/', '$1' . $attrs, $tag, 1 ) ?? $tag;
    }
}