<?php
/**
 * Onboarding AJAX handler for saving blog configuration.
 *
 * @package AiBlogWriter
 */

defined( 'ABSPATH' ) || exit;

class ABPW_Onboarding {

    /**
     * Allowed language codes.
     *
     * @var array
     */
    private static $allowed_languages = array(
        'en', 'es', 'fr', 'de', 'pt', 'it', 'nl', 'pl',
        'sv', 'no', 'da', 'fi', 'cs', 'ro', 'hu', 'tr',
        'ja', 'ko', 'zh', 'ar',
    );

    /**
     * Allowed communication styles.
     *
     * @var array
     */
    private static $allowed_styles = array(
        'expert', 'simple', 'premium', 'sales', 'neutral',
    );

    /**
     * Constructor: register AJAX hooks.
     */
    public function __construct() {
        add_action( 'wp_ajax_abpw_save_config', array( $this, 'handle_save_config' ) );
        add_action( 'wp_ajax_abpw_load_onboarding_config', array( $this, 'handle_load_config' ) );
    }

    /**
     * Load existing config from server to pre-fill onboarding fields (reconnect scenario).
     */
    public function handle_load_config() {
        check_ajax_referer( 'abpw_onboarding_nonce', 'abpw_nonce' );

        if ( ! current_user_can( 'manage_options' ) ) {
            wp_send_json_error( array(
                'message' => __( 'You do not have permission to perform this action.', 'abp-writer-ai-blog-generator' ),
            ) );
        }

        $response = ABPW_Api_Client::get( '/config' );

        if ( is_wp_error( $response ) ) {
            wp_send_json_success( array( 'config' => null ) );
        }

        wp_send_json_success( array(
            'config' => isset( $response['config'] ) ? $response['config'] : null,
        ) );
    }

    /**
     * Handle the abpw_save_config AJAX action.
     */
    public function handle_save_config() {
        // Verify nonce.
        check_ajax_referer( 'abpw_onboarding_nonce', 'abpw_nonce' );

        // Capability check.
        if ( ! current_user_can( 'manage_options' ) ) {
            wp_send_json_error( array(
                'message' => __( 'You do not have permission to perform this action.', 'abp-writer-ai-blog-generator' ),
            ) );
        }

        // Sanitize and validate business description.
        $business_desc = isset( $_POST['business_desc'] )
            ? sanitize_textarea_field( wp_unslash( $_POST['business_desc'] ) )
            : '';

        if ( mb_strlen( $business_desc ) < 50 ) {
            wp_send_json_error( array(
                'field'   => 'business',
                'message' => __( 'Business description must be at least 50 characters.', 'abp-writer-ai-blog-generator' ),
            ) );
        }

        if ( mb_strlen( $business_desc ) > 1000 ) {
            wp_send_json_error( array(
                'field'   => 'business',
                'message' => __( 'Business description cannot exceed 1000 characters.', 'abp-writer-ai-blog-generator' ),
            ) );
        }

        // Sanitize location (optional).
        $location = isset( $_POST['location'] )
            ? sanitize_text_field( wp_unslash( $_POST['location'] ) )
            : '';

        // Validate language.
        $language = isset( $_POST['language'] )
            ? sanitize_text_field( wp_unslash( $_POST['language'] ) )
            : '';

        if ( ! in_array( $language, self::$allowed_languages, true ) ) {
            wp_send_json_error( array(
                'field'   => 'language',
                'message' => __( 'Please select a valid language.', 'abp-writer-ai-blog-generator' ),
            ) );
        }

        // Sanitize and validate keywords.
        $keywords_raw = isset( $_POST['keywords'] )
            ? sanitize_textarea_field( wp_unslash( $_POST['keywords'] ) )
            : '';

        $keywords = array_values( array_filter( array_map( 'trim', explode( ',', $keywords_raw ) ) ) );
        $keyword_count = count( $keywords );

        if ( $keyword_count < 5 ) {
            wp_send_json_error( array(
                'field'   => 'keywords',
                'message' => __( 'Please enter at least 5 keywords.', 'abp-writer-ai-blog-generator' ),
            ) );
        }

        if ( $keyword_count > 50 ) {
            wp_send_json_error( array(
                'field'   => 'keywords',
                'message' => __( 'Please enter no more than 50 keywords.', 'abp-writer-ai-blog-generator' ),
            ) );
        }

        // Validate communication style.
        $comm_style = isset( $_POST['comm_style'] )
            ? sanitize_text_field( wp_unslash( $_POST['comm_style'] ) )
            : '';

        if ( ! in_array( $comm_style, self::$allowed_styles, true ) ) {
            wp_send_json_error( array(
                'field'   => 'style',
                'message' => __( 'Please select a valid communication style.', 'abp-writer-ai-blog-generator' ),
            ) );
        }

        // Send config to AiBlogPress API.
        $result = ABPW_Api_Client::post( '/config', array(
            'business_desc' => $business_desc,
            'location'      => $location,
            'language'       => $language,
            'keywords'       => $keywords,
            'comm_style'     => $comm_style,
        ) );

        if ( is_wp_error( $result ) ) {
            wp_send_json_error( array(
                'message' => $result->get_error_message(),
            ) );
        }

        // Mark onboarding as complete.
        update_option( 'aiblogpress_onboarding_complete', true );

        wp_send_json_success( array(
            'message'  => __( 'Configuration saved successfully.', 'abp-writer-ai-blog-generator' ),
            'redirect' => admin_url( 'admin.php?page=abp-writer-topics' ),
        ) );
    }
}