<?php
/**
 * Blog Configuration handler for AiBlogPress plugin.
 *
 * Handles loading and saving blog config via AJAX.
 *
 * @package AiBlogWriter
 */

defined( 'ABSPATH' ) || exit;

class ABPW_Config {

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

    /**
     * Allowed languages.
     *
     * @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',
    );

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

    /**
     * Handle loading config via AJAX.
     */
    public function handle_load_config() {
        check_ajax_referer( 'abpw_config_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_error( array(
                'message' => $response->get_error_message(),
            ) );
        }

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

    /**
     * Handle saving config via AJAX.
     */
    public function handle_save_config() {
        check_ajax_referer( 'abpw_config_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' ),
            ) );
        }

        // Sanitize inputs.
        $business_desc = isset( $_POST['business_desc'] )
            ? sanitize_textarea_field( wp_unslash( $_POST['business_desc'] ) )
            : '';
        $location      = isset( $_POST['location'] )
            ? sanitize_text_field( wp_unslash( $_POST['location'] ) )
            : '';
        $language      = isset( $_POST['language'] )
            ? sanitize_text_field( wp_unslash( $_POST['language'] ) )
            : '';
        $keywords_raw  = isset( $_POST['keywords'] )
            ? sanitize_textarea_field( wp_unslash( $_POST['keywords'] ) )
            : '';
        $comm_style    = isset( $_POST['comm_style'] )
            ? sanitize_text_field( wp_unslash( $_POST['comm_style'] ) )
            : '';

        // Validate business description.
        $desc_len = mb_strlen( $business_desc );
        if ( $desc_len < 50 || $desc_len > 1000 ) {
            wp_send_json_error( array(
                'field'   => 'business_desc',
                'message' => __( 'Business description must be between 50 and 1000 characters.', 'abp-writer-ai-blog-generator' ),
            ) );
        }

        // Validate 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' ),
            ) );
        }

        // Validate keywords.
        $keywords_array = array_values( array_filter( array_map( 'trim', explode( ',', $keywords_raw ) ) ) );
        $keyword_count  = count( $keywords_array );
        if ( $keyword_count < 5 || $keyword_count > 50 ) {
            wp_send_json_error( array(
                'field'   => 'keywords',
                'message' => __( 'Please enter between 5 and 50 keywords separated by commas.', 'abp-writer-ai-blog-generator' ),
            ) );
        }

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

        // Build API payload.
        $data = array(
            'business_desc' => $business_desc,
            'location'      => $location,
            'language'      => $language,
            'keywords'      => $keywords_array,
            'comm_style'    => $comm_style,
        );

        $response = ABPW_Api_Client::post( '/config', $data );

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

        wp_send_json_success( array(
            'config'  => isset( $response['config'] ) ? $response['config'] : $data,
            'message' => __( 'Configuration saved successfully.', 'abp-writer-ai-blog-generator' ),
        ) );
    }
}