<?php
/**
 * Trait AIJE_Stats
 * Heartbeat, Score-Reporting, Telemetrie-Einwilligung, Pro-Status-Check
 */

if ( ! defined( 'ABSPATH' ) ) { exit; }

trait AIJE_Stats {

    public static function stats_secret() {
        return hash( 'sha256', home_url() . self::STATS_SALT );
    }

    private function ensure_heartbeat_cron() {
        $scheduled = wp_next_scheduled( self::CRON_HEARTBEAT );
        if ( $scheduled ) {
            $schedule = wp_get_schedule( self::CRON_HEARTBEAT );
            if ( $schedule === 'aije_weekly' ) {
                wp_unschedule_event( $scheduled, self::CRON_HEARTBEAT );
                $scheduled = false;
            }
        }
        if ( ! $scheduled ) {
            wp_schedule_event( time() + 300, 'aije_daily', self::CRON_HEARTBEAT );
        }
    }

    public function on_admin_login( $user_login, $user ) {
        if ( ! user_can( $user, 'manage_options' ) ) { return; }
        $last = (int) get_option( 'aije_last_heartbeat', 0 );
        if ( time() - $last < DAY_IN_SECONDS ) { return; }
        $this->cron_heartbeat_runner();
    }

    public function on_admin_activity() {
        if ( ! current_user_can( 'manage_options' ) ) { return; }
        $last            = (int) get_option( 'aije_last_heartbeat', 0 );
        $last_version    = get_option( 'aije_last_heartbeat_version', '' );
        $current_version = AIJE_PLUGIN_VERSION;
        if ( $last_version !== $current_version ) {
            update_option( 'aije_last_heartbeat_version', $current_version );
            delete_option( 'aije_last_heartbeat' );
            delete_transient( 'aije_pro_status_' . md5( home_url() ) );
            $this->cron_heartbeat_runner();
            $this->get_pro_status();
            return;
        }
        if ( time() - $last < DAY_IN_SECONDS ) { return; }
        $this->cron_heartbeat_runner();
    }

    public function send_first_ping() {
        global $wp_version;
        $o          = $this->get_opts();
        $post_count = 0;
        foreach ( $o['enabled_post_types'] as $pt ) {
            $cnt = wp_count_posts( $pt );
            $post_count += (int) ( $cnt->publish ?? 0 );
        }
        wp_remote_post( self::STATS_ENDPOINT . 'heartbeat', array(
            'timeout'   => 8,
            'headers'   => array( 'Content-Type' => 'application/json' ),
            'body'      => wp_json_encode( array( 'secret' => self::stats_secret(), 'site_url' => home_url(), 'site_name' => get_bloginfo( 'name' ), 'wp_version' => $wp_version ?? '', 'php_version' => PHP_VERSION, 'plugin_version' => AIJE_PLUGIN_VERSION, 'post_count' => $post_count, 'first_ping' => true, 'features' => $this->get_feature_usage_snapshot() ) ),
            'blocking'  => false,
            'sslverify' => true,
        ) );
    }

    public function cron_heartbeat_runner() {
        if ( get_option( self::OPT_STATS_OPTOUT ) ) { return; }
        global $wp_version;
        $o          = $this->get_opts();
        $post_count = 0;
        foreach ( $o['enabled_post_types'] as $pt ) {
            $count = wp_count_posts( $pt );
            $post_count += (int) ( $count->publish ?? 0 );
        }
        wp_remote_post( self::STATS_ENDPOINT . 'heartbeat', array(
            'timeout'   => 8,
            'headers'   => array( 'Content-Type' => 'application/json' ),
            'body'      => wp_json_encode( array( 'secret' => self::stats_secret(), 'site_url' => home_url(), 'site_name' => get_bloginfo( 'name' ), 'wp_version' => $wp_version ?? '', 'php_version' => PHP_VERSION, 'plugin_version' => AIJE_PLUGIN_VERSION, 'post_count' => $post_count, 'features' => $this->get_feature_usage_snapshot() ) ),
            'blocking'  => false,
            'sslverify' => true,
        ) );
        update_option( 'aije_last_heartbeat', time(), false );
        $this->send_score_stats();
    }

    /**
     * Aggregierte, anonyme Nutzungssignale für konkrete Features — bewusst nur
     * Zähler/Booleans, keine Inhalte (Job-Titel, Bio-Texte etc. werden NICHT
     * mitgesendet), damit die Zusage in der readme.txt-FAQ ("keine Inhalte")
     * weiterhin stimmt. Fließt ins bestehende Heartbeat-Payload mit ein statt
     * einen eigenen Request zu erzeugen.
     */
    private function get_feature_usage_snapshot() {
        return array(
            'gsc_connected'        => (bool) get_option( 'aije_gsc_refresh_token' ),
            'eeat_profiles_filled' => $this->count_eeat_profiles_filled(),
            'internal_link_uses'   => (int) get_option( 'aije_internal_link_uses', 0 ),
        );
    }

    /**
     * Zählt Nutzer mit Schreibrechten, die mindestens eines der Experten-Profil-
     * Felder (Berufsbezeichnung, Fachbiografie, Website, SameAs-Links) ausgefüllt
     * haben. Nur die Anzahl wird übertragen, nie die Feldinhalte selbst.
     */
    private function count_eeat_profiles_filled() {
        $users = get_users( array( 'capability' => 'edit_posts', 'fields' => array( 'ID' ) ) );
        $count = 0;
        foreach ( $users as $u ) {
            $job    = get_user_meta( $u->ID, self::USER_META_JOB_TITLE, true );
            $bio    = get_user_meta( $u->ID, self::USER_META_EXPERTISE, true );
            $site   = get_user_meta( $u->ID, self::USER_META_WEBSITE, true );
            $sameas = get_user_meta( $u->ID, self::USER_META_SAME_AS, true );
            if ( ! empty( $job ) || ! empty( $bio ) || ! empty( $site ) || ! empty( $sameas ) ) { $count++; }
        }
        return $count;
    }

    private function send_score_stats() {
        $o     = $this->get_opts();
        $query = new WP_Query( array( 'post_type' => $o['enabled_post_types'], 'posts_per_page' => -1, 'post_status' => 'publish', 'no_found_rows' => true ) );
        if ( ! $query->have_posts() ) { return; }
        $scores     = array();
        $cat_totals = array( 'content' => 0, 'eeat' => 0, 'technical' => 0, 'linking' => 0 );
        $issue_freq = array();
        $count      = 0;
        while ( $query->have_posts() ) {
            $query->the_post();
            $analysis = $this->calculate_ai_analysis( get_post() );
            $scores[] = $analysis['score'];
            foreach ( $cat_totals as $k => $_ ) { $cat_totals[ $k ] += $analysis['categories'][ $k ]['score'] ?? 0; }
            foreach ( array_slice( $analysis['issues'], 0, 3 ) as $issue ) {
                $key = $issue['msg'] ?? '';
                $issue_freq[ $key ] = ( $issue_freq[ $key ] ?? 0 ) + 1;
            }
            $count++;
        }
        wp_reset_postdata();
        if ( $count === 0 ) { return; }
        arsort( $issue_freq );
        $avg_score = round( array_sum( $scores ) / $count );
        $cat_avgs  = array();
        foreach ( $cat_totals as $k => $total ) { $cat_avgs[ $k ] = round( $total / $count ); }
        wp_remote_post( self::STATS_ENDPOINT . 'score', array(
            'timeout'   => 8,
            'headers'   => array( 'Content-Type' => 'application/json' ),
            'body'      => wp_json_encode( array( 'secret' => self::stats_secret(), 'site_url' => home_url(), 'plugin_version' => AIJE_PLUGIN_VERSION, 'preset' => $o['score_preset'] ?? 'standard', 'avg_score' => $avg_score, 'scores' => $cat_avgs, 'top_issues' => array_keys( array_slice( $issue_freq, 0, 5, true ) ), 'post_count' => $count ) ),
            'blocking'  => false,
            'sslverify' => true,
        ) );
    }

    /* ===== Pro-Status ===== */

    public function get_pro_status() {
        $cache_key = 'aije_pro_status_' . md5( home_url() );
        delete_transient( $cache_key );
        $payload  = array( 'secret' => self::stats_secret(), 'site_url' => home_url(), 'action' => 'status', 'plugin_version' => AIJE_PLUGIN_VERSION );
        $response = wp_remote_post( self::AI_PROXY_URL, array( 'timeout' => 8, 'headers' => array( 'Content-Type' => 'application/json' ), 'body' => wp_json_encode( $payload ), 'sslverify' => false ) );
        if ( ! is_wp_error( $response ) ) {
            $body = json_decode( wp_remote_retrieve_body( $response ), true );
            if ( ! empty( $body['success'] ) ) {
                set_transient( $cache_key, $body, 5 * MINUTE_IN_SECONDS );
                return $body;
            }
        }
        return array( 'tier' => 'free', 'is_pro' => false, 'remaining' => 3 );
    }

    public function aije_check_status_handler() {
        check_ajax_referer( 'aije_topic_nonce', 'nonce' );
        if ( ! current_user_can( 'edit_posts' ) ) { wp_send_json_error(); }
        $payload  = array( 'secret' => self::stats_secret(), 'site_url' => home_url(), 'action' => 'status', 'plugin_version' => AIJE_PLUGIN_VERSION );
        $response = wp_remote_post( self::AI_PROXY_URL, array( 'timeout' => 10, 'headers' => array( 'Content-Type' => 'application/json' ), 'body' => wp_json_encode( $payload ), 'sslverify' => false ) );
        if ( is_wp_error( $response ) ) { wp_send_json_error(); }
        $body = json_decode( wp_remote_retrieve_body( $response ), true );
        if ( ! empty( $body['success'] ) ) {
            delete_transient( 'aije_pro_status_' . md5( home_url() ) );
            set_transient( 'aije_pro_status_' . md5( home_url() ), $body, 5 * MINUTE_IN_SECONDS );
            wp_send_json_success( $body );
        }
        wp_send_json_error();
    }

    /* ===== Telemetrie-Einwilligung ===== */

    public function stats_consent_notice() {
        if ( get_option( 'aije_stats_notice_dismissed' ) ) { return; }
        if ( ! current_user_can( 'manage_options' ) ) { return; }
        $is_optout  = (bool) get_option( self::OPT_STATS_OPTOUT );
        $optout_url = wp_nonce_url( admin_url( 'admin-post.php?action=aije_stats_optout' ), 'aije_stats_optout' );
        $optin_url  = wp_nonce_url( admin_url( 'admin-post.php?action=aije_stats_optin' ),  'aije_stats_optin' );
        echo '<div class="notice notice-info" style="padding:14px 16px;display:flex;align-items:flex-start;gap:16px;flex-wrap:wrap;">';
        echo '<div style="flex:1;min-width:280px;"><strong>AI Auto Embed – Anonyme Nutzungsstatistiken</strong><br>';
        echo '<span style="font-size:13px;color:#555;line-height:1.6;">Das Plugin sendet anonyme Daten (Site-URL, PHP-Version, aggregierte Score-Durchschnitte – keine Inhalte, keine E-Mails). Das hilft dabei, das Plugin zu verbessern.</span></div>';
        echo '<div style="display:flex;gap:8px;align-items:center;flex-shrink:0;padding-top:2px;">';
        if ( $is_optout ) {
            echo '<span style="color:#888;font-size:12px;">Statistiken deaktiviert.</span> ';
            echo '<a href="' . esc_url( $optin_url ) . '" class="button button-small">Wieder aktivieren</a>';
        } else {
            echo '<a href="' . esc_url( $optout_url ) . '" class="button button-small">Deaktivieren</a>';
            echo '<a href="' . esc_url( $optin_url ) . '" class="button button-primary button-small">OK, verstanden</a>';
        }
        echo '</div></div>';
    }

    public function handle_stats_optout() {
        check_admin_referer( 'aije_stats_optout' );
        if ( ! current_user_can( 'manage_options' ) ) { wp_die(); }
        update_option( self::OPT_STATS_OPTOUT, 1, false );
        update_option( 'aije_stats_notice_dismissed', 1, false );
        wp_safe_redirect( add_query_arg( 'aije_stats', 'optout', wp_get_referer() ?: admin_url() ) );
        exit;
    }

    public function handle_stats_optin() {
        check_admin_referer( 'aije_stats_optin' );
        if ( ! current_user_can( 'manage_options' ) ) { wp_die(); }
        delete_option( self::OPT_STATS_OPTOUT );
        update_option( 'aije_stats_notice_dismissed', 1, false );
        wp_safe_redirect( add_query_arg( 'aije_stats', 'optin', wp_get_referer() ?: admin_url() ) );
        exit;
    }
}