<?php

if ( ! defined( 'ABSPATH' ) ) {
    exit;
}

class RecomAI_WooCommerce {

    public function init() {
        add_action( 'woocommerce_new_product', array( $this, 'trigger_sync_after_update' ), 10, 2 );
        add_action( 'woocommerce_update_product', array( $this, 'trigger_sync_after_update' ), 10, 2 );
        
        // Register REST API endpoint for WooCommerce callback
        add_action( 'rest_api_init', array( $this, 'register_rest_routes' ) );
    }

    public function register_rest_routes() {
        register_rest_route( 'aimbrill-recomai/v1', '/wc-callback', array(
            'methods'             => 'POST',
            'callback'            => array( $this, 'handle_wc_callback' ),
            'permission_callback' => '__return_true',
        ) );
    }

    public function get_auth_url() {
        if ( ! class_exists( 'WooCommerce' ) ) {
            return new WP_Error( 'wc_missing', 'WooCommerce is not active.' );
        }

        $app_name    = 'RecomAI Chatbot';
        $user_id     = get_current_user_id();
        $return_url  = admin_url( 'admin.php?page=aimbrill-chatbot-for-recomai&wc-auth=success' );
        $callback_url = get_rest_url( null, 'aimbrill-recomai/v1/wc-callback' );
        $scope       = 'read_write';

        $store_url = untrailingslashit( site_url() );
        
        $state = wp_generate_password( 32, false );
        set_transient( 'recomai_wc_auth_state_' . $user_id, $state, HOUR_IN_SECONDS );

        $auth_url = sprintf(
            '%s/wc-auth/v1/authorize?app_name=%s&scope=%s&user_id=%d&return_url=%s&callback_url=%s',
            $store_url,
            rawurlencode( $app_name ),
            $scope,
            $user_id,
            rawurlencode( $return_url ),
            rawurlencode( add_query_arg( array( 'auth_state' => $state, 'user_id' => $user_id ), $callback_url ) )
        );

        return $auth_url;
    }

    public function handle_wc_callback( $request ) {
        $params = $request->get_params();
        $user_id = isset( $params['user_id'] ) ? absint( $params['user_id'] ) : 0;
        $auth_state = isset( $params['auth_state'] ) ? sanitize_text_field( $params['auth_state'] ) : '';
        $saved_state = get_transient( 'recomai_wc_auth_state_' . $user_id );

        if ( empty( $auth_state ) || $auth_state !== $saved_state ) {
            return new WP_REST_Response( array( 'status' => 'error', 'message' => 'Invalid auth state' ), 403 );
        }

        delete_transient( 'recomai_wc_auth_state_' . $user_id );

        if ( empty( $params['consumer_key'] ) || empty( $params['consumer_secret'] ) ) {
            return new WP_REST_Response( array( 'status' => 'error', 'message' => 'Missing keys' ), 400 );
        }

        $settings = get_option( 'recomai_settings' );
        $settings['wc_consumer_key']    = sanitize_text_field( $params['consumer_key'] );
        $settings['wc_consumer_secret'] = sanitize_text_field( $params['consumer_secret'] );
        $settings['wc_store_url']       = untrailingslashit( site_url() );
        
        update_option( 'recomai_settings', $settings );

        // Sync with RecomAI Backend
        $api = new RecomAI_API();
        $api->connect_woocommerce( 
            $settings['wc_consumer_key'], 
            $settings['wc_consumer_secret'], 
            $settings['wc_store_url'] 
        );

        return new WP_REST_Response( array( 'status' => 'success' ), 200 );
    }

    public function trigger_sync_after_update( $product_id, $product ) {
        $settings = get_option( 'recomai_settings' );
        if ( ! empty( $settings['api_token'] ) && ! empty( $settings['wc_consumer_key'] ) ) {
             // Future: Implement webhook or direct API call to RecomAI for single product sync
        }
    }
}