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

class AGENLI_LLMS {

    public static function init() {
        add_action( 'parse_request', array( __CLASS__, 'intercept_request' ), 1 );
        add_action( 'save_post',     array( __CLASS__, 'clear_cache' ) );
        add_action( 'delete_post',   array( __CLASS__, 'clear_cache' ) );
    }

    public static function on_activate() {
        flush_rewrite_rules( false );
    }

    /**
     * Intercept /llms.txt and /llms-full.txt directly from REQUEST_URI.
     * Bypasses rewrite rules entirely - works on all WordPress setups.
     */
    public static function intercept_request() {
        $agenli_raw = isset( $_SERVER['REQUEST_URI'] )
            ? strtok( wp_unslash( $_SERVER['REQUEST_URI'] ), '?' ) // phpcs:ignore
            : '';

        $agenli_home_path = rtrim( (string) wp_parse_url( home_url(), PHP_URL_PATH ), '/' );

        if ( $agenli_home_path && 0 === strpos( $agenli_raw, $agenli_home_path ) ) {
            $agenli_path = substr( $agenli_raw, strlen( $agenli_home_path ) );
        } else {
            $agenli_path = $agenli_raw;
        }
        $agenli_path = '/' . ltrim( $agenli_path, '/' );

        if ( '/llms.txt' !== $agenli_path && '/llms-full.txt' !== $agenli_path ) return;

        if ( ! agenli_is_pro() ) {
            header( 'Content-Type: text/plain; charset=utf-8' );
            status_header( 200 );
            echo '# LLMs.txt - AgencyBoost Pro Feature' . "
"; // phpcs:ignore
            echo '# Upgrade at https://d3experts.in/agencyboost' . "
"; // phpcs:ignore
            exit;
        }

        if ( '/llms-full.txt' === $agenli_path ) {
            self::output_full();
        } else {
            self::output_lite();
        }
        exit;
    }

    private static function output_lite() {
        $agenli_cached = get_transient( 'agenli_llms_lite' );
        if ( false !== $agenli_cached ) {
            header( 'Content-Type: text/plain; charset=utf-8' );
            echo $agenli_cached; // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
            return;
        }

        $agenli_out  = '# ' . get_bloginfo( 'name' ) . "\n";
        $agenli_out .= '> ' . get_bloginfo( 'description' ) . "\n\n";
        $agenli_out .= '## Pages' . "\n\n";

        $agenli_pages = get_posts( array(
            'post_type'      => 'page',
            'post_status'    => 'publish',
            'posts_per_page' => 200,
            'orderby'        => 'menu_order',
            'order'          => 'ASC',
        ));
        foreach ( $agenli_pages as $agenli_p ) {
            $agenli_robots = agenli_get_post_meta( $agenli_p->ID, 'seo_robots', 'index,follow' );
            if ( false !== strpos( $agenli_robots, 'noindex' ) ) continue;
            if ( '1' === agenli_get_post_meta( $agenli_p->ID, 'exclude_llms', '0' ) ) continue;
            $agenli_desc = agenli_get_post_meta( $agenli_p->ID, 'seo_desc' );
            if ( ! $agenli_desc ) {
                $agenli_desc = wp_trim_words( wp_strip_all_tags( $agenli_p->post_content ), 20, '...' );
            }
            $agenli_out .= '- [' . get_the_title( $agenli_p->ID ) . '](' . get_permalink( $agenli_p->ID ) . ')';
            if ( $agenli_desc ) $agenli_out .= ': ' . $agenli_desc;
            $agenli_out .= "\n";
        }

        $agenli_out .= "\n## Posts\n\n";

        $agenli_posts = get_posts( array(
            'post_type'      => 'post',
            'post_status'    => 'publish',
            'posts_per_page' => 100,
            'orderby'        => 'date',
            'order'          => 'DESC',
        ));
        foreach ( $agenli_posts as $agenli_p ) {
            $agenli_robots = agenli_get_post_meta( $agenli_p->ID, 'seo_robots', 'index,follow' );
            if ( false !== strpos( $agenli_robots, 'noindex' ) ) continue;
            if ( '1' === agenli_get_post_meta( $agenli_p->ID, 'exclude_llms', '0' ) ) continue;
            $agenli_desc = agenli_get_post_meta( $agenli_p->ID, 'seo_desc' );
            if ( ! $agenli_desc ) {
                $agenli_desc = wp_trim_words( wp_strip_all_tags( $agenli_p->post_content ), 20, '...' );
            }
            $agenli_out .= '- [' . get_the_title( $agenli_p->ID ) . '](' . get_permalink( $agenli_p->ID ) . ')';
            if ( $agenli_desc ) $agenli_out .= ': ' . $agenli_desc;
            $agenli_out .= "\n";
        }

        set_transient( 'agenli_llms_lite', $agenli_out, 6 * HOUR_IN_SECONDS );
        header( 'Content-Type: text/plain; charset=utf-8' );
        echo $agenli_out; // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
    }

    private static function output_full() {
        header( 'Content-Type: text/plain; charset=utf-8' );
        $agenli_items = get_posts( array(
            'post_type'      => array( 'post', 'page' ),
            'post_status'    => 'publish',
            'posts_per_page' => 500,
        ));
        echo '# ' . esc_html( get_bloginfo( 'name' ) ) . ' - Full Content Index' . "\n\n";
        foreach ( $agenli_items as $agenli_p ) {
            $agenli_robots = agenli_get_post_meta( $agenli_p->ID, 'seo_robots', 'index,follow' );
            if ( false !== strpos( $agenli_robots, 'noindex' ) ) continue;
            if ( '1' === agenli_get_post_meta( $agenli_p->ID, 'exclude_llms', '0' ) ) continue;
            echo '# ' . esc_html( get_the_title( $agenli_p->ID ) ) . "\n";
            echo 'URL: ' . esc_url( get_permalink( $agenli_p->ID ) ) . "\n";
            echo 'Date: ' . esc_html( gmdate( 'Y-m-d', strtotime( $agenli_p->post_date_gmt ) ) ) . "\n\n";
            echo esc_html( wp_strip_all_tags( $agenli_p->post_content ) ) . "\n\n---\n\n";
        }
    }

    public static function clear_cache() {
        delete_transient( 'agenli_llms_lite' );
    }

    public static function ajax_generate() {
        check_ajax_referer( 'agenli_nonce', 'nonce' );
        if ( ! current_user_can( 'manage_options' ) ) {
            wp_send_json_error( array( 'message' => 'Unauthorised.' ) );
        }
        if ( ! agenli_is_pro() ) {
            wp_send_json_error( array( 'message' => 'LLMs.txt requires AgencyBoost Pro.' ) );
        }
        self::clear_cache();
        wp_send_json_success( array(
            'lite_url' => home_url( '/llms.txt' ),
            'full_url' => home_url( '/llms-full.txt' ),
            'message'  => 'LLMs.txt regenerated successfully.',
        ));
    }
}