<?php

defined( 'ABSPATH' ) || exit;
/**
 * Intelligente Hinweise (0.40.0).
 *
 * Sectivio schaut auf die eigenen Daten und schlägt konkrete nächste Schritte vor,
 * damit Kunden schneller erste Erfolge sehen — z. B. die Startschwelle senken, wenn
 * die Website wenige Besuche hat. Wo möglich, übernimmt ein Klick die Änderung.
 * Jeder Hinweis lässt sich 30 Tage ausblenden. Erscheint im Dashboard, in den
 * Einstellungen (nur die dort lösbaren) und als Text im Monatsbericht.
 */
class ADSEC_Hints {
    const DISMISS_OPTION = 'adsec_hints_dismissed';

    const DISMISS_DAYS = 30;

    const MIN_THRESHOLD = 300;

    // 0.48.0: start at 300 visits, protected by ADSEC_Guard and the early phase
    public function __construct() {
        add_action( 'admin_post_adsec_hint', array($this, 'handle') );
    }

    /* ---------- Hinweise berechnen ---------- */
    /**
     * Alle zutreffenden Hinweise, wichtigste zuerst.
     * Felder: id, prio (1 = dringend), text, where (dashboard|settings|report),
     * action (Schlüssel für handle()) + label, ODER link + label.
     */
    public static function all() {
        $s = get_option( 'adsec_settings', array() );
        $hints = array();
        $secs = self::section_counts();
        $set_url = admin_url( 'admin.php?page=adsec-settings' );
        $inv_url = admin_url( 'admin.php?page=adsec-inventory' );
        // Sectivio ist ausgeschaltet, obwohl Inhalte erfasst sind.
        if ( empty( $s['enabled'] ) && $secs['total'] > 0 ) {
            $text = __( 'Sectivio is still turned off. Your content has been recorded; all that is missing is the start.', 'sectivio' );
            $hints[] = array(
                'id'     => 'enable',
                'prio'   => 1,
                'where'  => array('dashboard', 'settings', 'report'),
                'text'   => $text,
                'action' => 'enable',
                'label'  => __( 'Turn on Sectivio', 'sectivio' ),
            );
        }
        // Messung steht still, obwohl vorher Besuche kamen (meist Caching/JS-Verzögerung).
        $stall = self::stalled_days();
        if ( !empty( $s['enabled'] ) && $stall >= 3 ) {
            $text = sprintf( 
                /* translators: %d: Anzahl Tage */
                _n(
                    'Sectivio has not measured any visits for %d day, although visits used to come in regularly.',
                    'Sectivio has not measured any visits for %d days, although visits used to come in regularly.',
                    $stall,
                    'sectivio'
                ),
                $stall
             );
            $text .= ' ' . (( self::rocket_delays_js() ? __( 'WP Rocket delays JavaScript on your website. In WP Rocket, go to “File Optimization”, add the exclusion “sectivio” under “Delay JavaScript execution” and then clear the cache.', 'sectivio' ) : __( 'The most common cause is a caching or optimization plugin that delays or combines scripts. Exclude Sectivio from these features there and clear the cache.', 'sectivio' ) ));
            $hints[] = array(
                'id'    => 'stalled',
                'prio'  => 1,
                'where' => array('dashboard', 'report'),
                'text'  => $text,
            );
        }
        // Anrufe/E-Mails werden nicht gezählt, obwohl die Website solche Links hat.
        $types = (array) ($s['goal_types'] ?? array('form'));
        foreach ( array(
            'tel'    => 'tel:',
            'mailto' => 'mailto:',
        ) as $type => $scheme ) {
            if ( in_array( $type, $types, true ) || !self::site_has_link( $scheme ) ) {
                continue;
            }
            $hints[] = array(
                'id'     => 'goal_' . $type,
                'prio'   => 2,
                'where'  => array('dashboard', 'settings', 'report'),
                'text'   => ( 'tel' === $type ? __( 'Your website has clickable phone numbers, but Sectivio does not count phone calls as enquiries yet. People who call are often your most valuable contacts.', 'sectivio' ) : __( 'Your website has clickable email addresses, but Sectivio does not count emails as enquiries yet.', 'sectivio' ) ),
                'action' => 'goal_' . $type,
                'label'  => ( 'tel' === $type ? __( 'Count phone calls', 'sectivio' ) : __( 'Count emails', 'sectivio' ) ),
            );
        }
        // Viele Besuche, aber keine einzige Anfrage gezählt.
        $month = ADSEC_Daily::metrics( array(
            'since' => gmdate( 'Y-m-d', time() - 30 * DAY_IN_SECONDS ),
        ) );
        if ( $month['sessions'] >= 100 && 0 === (int) $month['goal_sessions'] ) {
            $hints[] = array(
                'id'    => 'no_goals',
                'prio'  => 2,
                'where' => array('dashboard', 'settings', 'report'),
                'text'  => sprintf( 
                    /* translators: %s: Anzahl Besuche */
                    __( 'In the last 30 days, your website had %s visits, but Sectivio did not count a single enquiry. Without enquiries, Sectivio can only evaluate reading time. Please check whether your goal is set up correctly.', 'sectivio' ),
                    number_format_i18n( $month['sessions'] )
                 ),
                'link'  => $set_url . '#adsec-erfolg',
                'label' => __( 'Check goal', 'sectivio' ),
            );
        }
        // Viele Abschnitte ohne erkanntes Thema.
        if ( $secs['total'] >= 10 && $secs['unknown'] / $secs['total'] >= 0.3 ) {
            $configured = ADSEC_AI::is_configured();
            $hints[] = array(
                'id'    => 'topics',
                'prio'  => 3,
                'where' => array('dashboard', 'settings', 'report'),
                'text'  => sprintf( 
                    /* translators: %s: Anzahl Abschnitte */
                    __( 'For %s sections, Sectivio does not yet know what they are about. With detected content, Sectivio learns faster, because similar sections benefit from each other.', 'sectivio' ),
                    number_format_i18n( $secs['unknown'] )
                 ),
                'link'  => ( $configured ? $inv_url : $set_url . '#adsec-ki' ),
                'label' => ( $configured ? __( 'Have content detected', 'sectivio' ) : __( 'Set up detection', 'sectivio' ) ),
            );
        }
        // 0.52.0: remind the owner to mention Sectivio in the privacy policy.
        if ( !ADSEC_Privacy::is_done() ) {
            $hints[] = array(
                'id'    => 'privacy',
                'prio'  => 2,
                'where' => array('dashboard', 'settings'),
                'text'  => __( 'Please mention Sectivio in your privacy policy. Sectivio provides the text, adapted to your settings – a shortcode is all it takes.', 'sectivio' ),
                'link'  => $set_url . '#adsec-datenschutz',
                'label' => __( 'Show text', 'sectivio' ),
            );
        }
        // Monatsbericht aus — erst nach zwei Wochen vorschlagen.
        $first = ADSEC_Daily::first_day();
        if ( empty( $s['report_enabled'] ) && $first && strtotime( $first . ' UTC' ) < time() - 14 * DAY_IN_SECONDS ) {
            $hints[] = array(
                'id'     => 'report',
                'prio'   => 4,
                'where'  => array('dashboard', 'report'),
                'text'   => sprintf( 
                    /* translators: %s: E-Mail-Adresse */
                    __( 'Would you like to see how your website is doing by email once a month? The report will be sent to %s.', 'sectivio' ),
                    ( (string) ($s['report_email'] ?? '') ?: get_option( 'admin_email' ) )
                 ),
                'action' => 'report',
                'label'  => __( 'Turn on monthly report', 'sectivio' ),
            );
        }
        $dismissed = (array) get_option( self::DISMISS_OPTION, array() );
        $hints = array_values( array_filter( $hints, function ( $h ) use($dismissed) {
            return empty( $dismissed[$h['id']] ) || $dismissed[$h['id']] < time() - self::DISMISS_DAYS * DAY_IN_SECONDS;
        } ) );
        usort( $hints, function ( $a, $b ) {
            return $a['prio'] <=> $b['prio'];
        } );
        return $hints;
    }

    /** Hinweise für einen Ort (dashboard|settings|report). */
    public static function for_context( $where, $limit = 3 ) {
        $out = array();
        foreach ( self::all() as $h ) {
            if ( in_array( $where, $h['where'], true ) ) {
                $out[] = $h;
            }
        }
        return array_slice( $out, 0, $limit );
    }

    /** Abschnittszahlen: gesamt und ohne Thema. */
    private static function section_counts() {
        global $wpdb;
        $t = ADSEC_Database::sections_table();
        // phpcs:disable WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching -- custom plugin table.
        $out = array(
            'total'   => (int) $wpdb->get_var( $wpdb->prepare( 'SELECT COUNT(*) FROM %i WHERE excluded = 0', $t ) ),
            'unknown' => (int) $wpdb->get_var( $wpdb->prepare( "SELECT COUNT(*) FROM %i WHERE excluded = 0 AND topic = 'unbekannt'", $t ) ),
        );
        // phpcs:enable WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching
        return $out;
    }

    /** Tage ohne Messung, wenn die Website davor im Schnitt mind. 2 Besuche/Tag hatte. */
    private static function stalled_days() {
        global $wpdb;
        // phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching -- custom plugin table.
        $last = $wpdb->get_var( $wpdb->prepare( 'SELECT MAX(created_at) FROM %i', ADSEC_Database::events_table() ) );
        if ( !$last ) {
            return 0;
        }
        $days = (int) floor( (time() - strtotime( $last . ' UTC' )) / DAY_IN_SECONDS );
        if ( $days < 3 ) {
            return 0;
        }
        // phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching -- custom plugin table.
        $before = (int) $wpdb->get_var( $wpdb->prepare( 'SELECT COUNT(DISTINCT session_key) FROM %i WHERE created_at >= %s', ADSEC_Database::events_table(), gmdate( 'Y-m-d H:i:s', strtotime( $last . ' UTC' ) - 14 * DAY_IN_SECONDS ) ) );
        return ( $before >= 28 ? $days : 0 );
    }

    /** Hat irgendein erfasster Abschnitt einen Link mit diesem Schema (tel:/mailto:)? */
    private static function site_has_link( $scheme ) {
        global $wpdb;
        $like = '%' . $wpdb->esc_like( 'href="' . $scheme ) . '%';
        // phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching -- custom plugin table.
        return (bool) $wpdb->get_var( $wpdb->prepare( 'SELECT 1 FROM %i WHERE html LIKE %s LIMIT 1', ADSEC_Database::sections_table(), $like ) );
    }

    /** WP Rocket mit „JavaScript-Ausführung verzögern" aktiv? */
    private static function rocket_delays_js() {
        return function_exists( 'get_rocket_option' ) && get_rocket_option( 'delay_js' );
    }

    /**
     * Wartezeit lesbar. $in = true für „in 3 Tagen / in etwa 4 Monaten",
     * sonst „noch 3 Tage / noch etwa 4 Monate".
     */
    private static function wait( $days, $in = false ) {
        $days = (int) $days;
        if ( $days < 14 ) {
            // Kontext „after in“: im Deutschen „in 3 Tagen“ statt „3 Tage“.
            // Translator comments sit on their own statements: Freemius' code formatter drops comments inside expressions.
            if ( $in ) {
                /* translators: %d: number of days. */
                return sprintf( _nx(
                    '%d day',
                    '%d days',
                    $days,
                    'after in',
                    'sectivio'
                ), $days );
            }
            /* translators: %d: number of days. */
            return sprintf( _n(
                '%d day',
                '%d days',
                $days,
                'sectivio'
            ), $days );
        }
        if ( $days < 60 ) {
            /* translators: %d: number of weeks. */
            return sprintf( __( 'about %d weeks', 'sectivio' ), (int) round( $days / 7 ) );
        }
        if ( $days < 730 ) {
            $m = (int) round( $days / 30 );
            /* translators: %d: number of months. */
            return ( $in ? sprintf( _x( 'about %d months', 'after in', 'sectivio' ), $m ) : sprintf( __( 'about %d months', 'sectivio' ), $m ) );
        }
        return ( $in ? _x( 'more than two years', 'after in', 'sectivio' ) : __( 'more than two years', 'sectivio' ) );
    }

    /* ---------- Anzeige ---------- */
    public static function render( $where ) {
        self::done_notice();
        $hints = self::for_context( $where, ( 'settings' === $where ? 2 : 3 ) );
        if ( !$hints ) {
            return;
        }
        $back = ( isset( $_SERVER['REQUEST_URI'] ) ? esc_url_raw( wp_unslash( $_SERVER['REQUEST_URI'] ) ) : admin_url( 'admin.php?page=adaptive-sections' ) );
        ?>
		<div class="adsec-hints">
			<h2><?php 
        esc_html_e( 'Recommendations for your website', 'sectivio' );
        ?></h2>
			<?php 
        foreach ( $hints as $h ) {
            ?>
				<div class="adsec-hint<?php 
            echo ( 1 === $h['prio'] ? ' is-urgent' : '' );
            ?>">
					<p><?php 
            echo esc_html( $h['text'] );
            ?></p>
					<div class="adsec-hint-actions">
						<?php 
            if ( !empty( $h['action'] ) ) {
                ?>
							<form method="post" action="<?php 
                echo esc_url( admin_url( 'admin-post.php' ) );
                ?>">
								<?php 
                wp_nonce_field( 'adsec_hint' );
                ?>
								<input type="hidden" name="action" value="adsec_hint">
								<input type="hidden" name="do" value="<?php 
                echo esc_attr( $h['action'] );
                ?>">
								<input type="hidden" name="arg" value="<?php 
                echo esc_attr( (string) ($h['arg'] ?? '') );
                ?>">
								<input type="hidden" name="back" value="<?php 
                echo esc_attr( $back );
                ?>">
								<button type="submit" class="button button-primary"><?php 
                echo esc_html( $h['label'] );
                ?></button>
							</form>
						<?php 
            } elseif ( !empty( $h['link'] ) ) {
                ?>
							<a class="button button-primary" href="<?php 
                echo esc_url( $h['link'] );
                ?>"><?php 
                echo esc_html( $h['label'] );
                ?></a>
						<?php 
            }
            ?>
						<form method="post" action="<?php 
            echo esc_url( admin_url( 'admin-post.php' ) );
            ?>">
							<?php 
            wp_nonce_field( 'adsec_hint' );
            ?>
							<input type="hidden" name="action" value="adsec_hint">
							<input type="hidden" name="do" value="dismiss">
							<input type="hidden" name="arg" value="<?php 
            echo esc_attr( $h['id'] );
            ?>">
							<input type="hidden" name="back" value="<?php 
            echo esc_attr( $back );
            ?>">
							<button type="submit" class="button-link adsec-hint-dismiss"><?php 
            esc_html_e( 'Hide', 'sectivio' );
            ?></button>
						</form>
					</div>
				</div>
			<?php 
        }
        ?>
		</div>
		<?php 
    }

    public function handle() {
        if ( !current_user_can( 'manage_options' ) ) {
            wp_die( esc_html__( 'You do not have permission to do this.', 'sectivio' ) );
        }
        check_admin_referer( 'adsec_hint' );
        $do = sanitize_key( wp_unslash( $_POST['do'] ?? '' ) );
        $arg = sanitize_key( wp_unslash( $_POST['arg'] ?? '' ) );
        $back = wp_validate_redirect( esc_url_raw( wp_unslash( $_POST['back'] ?? '' ) ), admin_url( 'admin.php?page=adaptive-sections' ) );
        $s = get_option( 'adsec_settings', array() );
        $done = '';
        switch ( $do ) {
            case 'dismiss':
                $d = (array) get_option( self::DISMISS_OPTION, array() );
                $d[$arg] = time();
                update_option( self::DISMISS_OPTION, $d, false );
                break;
            case 'enable':
                $s['enabled'] = true;
                $done = __( 'Sectivio is turned on.', 'sectivio' );
                break;
            case 'goal_tel':
            case 'goal_mailto':
                $type = substr( $do, 5 );
                $s['goal_types'] = array_values( array_unique( array_merge( (array) ($s['goal_types'] ?? array('form')), array($type) ) ) );
                $done = ( 'tel' === $type ? __( 'Phone calls now count as enquiries.', 'sectivio' ) : __( 'Emails now count as enquiries.', 'sectivio' ) );
                break;
            case 'report':
                $s['report_enabled'] = true;
                if ( empty( $s['report_email'] ) ) {
                    $s['report_email'] = get_option( 'admin_email' );
                }
                $done = __( 'The monthly report is turned on.', 'sectivio' );
                break;
        }
        if ( 'dismiss' !== $do ) {
            // Direkt schreiben: der Formular-Sanitizer würde fehlende Felder als „aus" werten.
            remove_all_filters( 'sanitize_option_adsec_settings' );
            update_option( 'adsec_settings', $s );
        }
        if ( $done ) {
            set_transient( 'adsec_hint_done_' . get_current_user_id(), $done, 60 );
        }
        wp_safe_redirect( $back );
        exit;
    }

    /** Bestätigung nach einer Ein-Klick-Aktion (einmalig). */
    public static function done_notice() {
        $key = 'adsec_hint_done_' . get_current_user_id();
        $done = get_transient( $key );
        if ( $done ) {
            delete_transient( $key );
            echo '<div class="notice notice-success is-dismissible"><p>' . esc_html( $done ) . '</p></div>';
        }
    }

}