<?php
/**
 * Plugin Name: WordPress Activity Stats
 * Description: Wtyczka do śledzenia statystyk sportowych (Rower, Bieganie, itp.).
 * Version: 1.0
 * Author: Jacek Fefliński
 */

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

// --- 1. INSTALACJA BAZY DANYCH (AKTYWACJA) ---
register_activation_hook( __FILE__, 'mystat_activate' );

function mystat_activate() {
    global $wpdb;
    $charset_collate = $wpdb->get_charset_collate();

    $table_categories = $wpdb->prefix . 'mystat_categories';
    $table_activities = $wpdb->prefix . 'mystat_activities';
    $table_event_types = $wpdb->prefix . 'mystat_event_types';
    $table_equipment = $wpdb->prefix . 'mystat_equipment';

    // SQL dla Kategorii
    $sql_cat = "CREATE TABLE $table_categories (
        id mediumint(9) NOT NULL AUTO_INCREMENT,
        name varchar(50) NOT NULL,
        icon varchar(50) NOT NULL,
        color varchar(20) NOT NULL,
        PRIMARY KEY  (id)
    ) $charset_collate;";

    // SQL dla Typów Wydarzeń
    $sql_event_types = "CREATE TABLE $table_event_types (
        id mediumint(9) NOT NULL AUTO_INCREMENT,
        name varchar(100) NOT NULL,
        PRIMARY KEY  (id)
    ) $charset_collate;";

    // SQL dla Sprzętu
    $sql_equipment = "CREATE TABLE $table_equipment (
        id mediumint(9) NOT NULL AUTO_INCREMENT,
        name varchar(100) NOT NULL,
        PRIMARY KEY  (id)
    ) $charset_collate;";

    // SQL dla Aktywności
    $sql_act = "CREATE TABLE $table_activities (
        id bigint(20) NOT NULL AUTO_INCREMENT,
        category_id mediumint(9) NOT NULL,
        date date NOT NULL,
        title varchar(255) DEFAULT '' NOT NULL,
        distance decimal(10,2) DEFAULT 0.00,
        duration time DEFAULT '00:00:00',
        calories int(11) DEFAULT 0,
        comment text,
        strava_url varchar(255) DEFAULT NULL,
        avg_heart_rate smallint(5) UNSIGNED DEFAULT NULL,
        max_heart_rate smallint(5) UNSIGNED DEFAULT NULL,
        avg_speed decimal(5,2) DEFAULT NULL,
        max_speed decimal(5,2) DEFAULT NULL,
        avg_cadence smallint(5) UNSIGNED DEFAULT NULL,
        max_cadence smallint(5) UNSIGNED DEFAULT NULL,
        total_elevation_gain int(11) DEFAULT NULL,
        total_elevation_loss int(11) DEFAULT NULL,
        min_altitude int(11) DEFAULT NULL,
        max_altitude int(11) DEFAULT NULL,
        equipment_id mediumint(9) DEFAULT NULL,
        gpx_url varchar(255) DEFAULT NULL,
        event_type_id mediumint(9) DEFAULT NULL,
        PRIMARY KEY  (id)
    ) $charset_collate;";

    require_once( ABSPATH . 'wp-admin/includes/upgrade.php' );
    dbDelta( $sql_equipment );
    dbDelta( $sql_cat );
    dbDelta( $sql_event_types );
    dbDelta( $sql_act );

    // Dodanie domyślnych kategorii, jeśli tabela jest pusta
    if ( $wpdb->get_var( "SELECT COUNT(*) FROM $table_categories" ) == 0 ) {
        $wpdb->insert( $table_categories, array( 'name' => 'Rower', 'icon' => 'dashicons-buddicons-groups', 'color' => '#3498db' ) );
        $wpdb->insert( $table_categories, array( 'name' => 'Bieganie', 'icon' => 'dashicons-businessman', 'color' => '#e74c3c' ) );
    }

    // Dodanie domyślnych typów wydarzeń, jeśli tabela jest pusta
    if ( $wpdb->get_var( "SELECT COUNT(*) FROM $table_event_types" ) == 0 ) {
        $default_event_types = ['Bez kategorii', 'Fitness', 'Geocaching', 'Podróżowanie', 'Rekreacyjny', 'Specjalne zdarzenie', 'Transport', 'Trening', 'Wyścig'];
        foreach ($default_event_types as $type_name) {
            $wpdb->insert( $table_event_types, array( 'name' => $type_name ) );
        }
        // Ustawienie domyślnego typu "Trening" dla istniejących aktywności, które go nie mają
        $training_id = $wpdb->get_var( $wpdb->prepare( "SELECT id FROM $table_event_types WHERE name = %s", 'Trening' ) );
        if ($training_id) {
            $wpdb->query( $wpdb->prepare( "UPDATE $table_activities SET event_type_id = %d WHERE event_type_id IS NULL OR event_type_id = 0", $training_id ) );
        }
    }

    // Dodanie domyślnego sprzętu, jeśli tabela jest pusta
    if ( $wpdb->get_var( "SELECT COUNT(*) FROM $table_equipment" ) == 0 ) {
        $default_equipment = ['Giant Revolt', 'Cube LTD', 'Author Agang', 'Liv Tempt 4', 'Cube Acid 24', 'Mongoose BMX', 'Nextbike - Miejski'];
        foreach ($default_equipment as $eq_name) {
            $wpdb->insert( $table_equipment, array( 'name' => $eq_name ) );
        }
    }
}

// --- 2. MENU ADMINA I DASHBOARD ---
add_action( 'admin_menu', 'mystat_add_admin_menu' );

function mystat_add_admin_menu() {
    add_menu_page( 
        'Moje Statystyki',          // Tytuł strony
        'Statystyki',               // Tytuł w menu
        'manage_options',           // Wymagane uprawnienia
        'moje-statystyki',          // Slug menu
        'mystat_dashboard_page',    // Funkcja renderująca stronę główną (dashboard)
        'dashicons-chart-line',     // Ikona
        6                           // Pozycja
    );

    add_submenu_page(
        'moje-statystyki',          // Slug rodzica
        'Dodaj Nowy Trening',       // Tytuł strony
        'Nowy trening',             // Tytuł w podmenu
        'manage_options',           // Wymagane uprawnienia
        'mystat-nowy-trening',      // Slug podmenu
        'mystat_add_new_page'       // Funkcja renderująca stronę dodawania
    );

    add_submenu_page(
        'moje-statystyki',
        'Typy Wydarzeń',
        'Typy wydarzeń',
        'manage_options',
        'mystat-event-types',
        'mystat_event_types_page'
    );

    add_submenu_page(
        'moje-statystyki',
        'Sprzęt',
        'Sprzęt',
        'manage_options',
        'mystat-equipment',
        'mystat_equipment_page'
    );
}

function mystat_dashboard_page() {
    echo '<div class="wrap"><h1>Moje Statystyki Sportowe</h1>';
    mystat_render_history_table();
    echo '</div>';
}

function mystat_add_new_page() {
    echo '<div class="wrap"><h1>Dodaj Nowy Trening</h1>';
    // Obsługa zapisu formularza (musi być przed renderowaniem, aby wyświetlić komunikat)
    mystat_handle_new_entry();
    // Formularz dodawania
    mystat_render_add_form();
    echo '</div>';
}

function mystat_event_types_page() {
    global $wpdb;
    $table_event_types = $wpdb->prefix . 'mystat_event_types';
    $message = '';
    $notice_class = '';

    // Handle POST requests (add/update)
    if ( isset( $_POST['submit'] ) && check_admin_referer( 'mystat_manage_event_type' ) ) {
        $name = sanitize_text_field( $_POST['event_type_name'] );
        $type_id = isset( $_POST['event_type_id'] ) ? intval( $_POST['event_type_id'] ) : 0;

        if ( ! empty( $name ) ) {
            if ( $type_id > 0 ) { // Update
                $wpdb->update( $table_event_types, [ 'name' => $name ], [ 'id' => $type_id ] );
                $message = 'Typ wydarzenia zaktualizowany.';
                $notice_class = 'notice-success';
            } else { // Insert
                $wpdb->insert( $table_event_types, [ 'name' => $name ] );
                $message = 'Typ wydarzenia dodany.';
                $notice_class = 'notice-success';
            }
        } else {
            $message = 'Nazwa typu wydarzenia nie może być pusta.';
            $notice_class = 'notice-error';
        }
    }

    // Handle GET requests (delete)
    if ( isset( $_GET['action'], $_GET['id'], $_GET['_wpnonce'] ) && $_GET['action'] === 'delete' ) {
        if ( wp_verify_nonce( $_GET['_wpnonce'], 'mystat_delete_event_type_' . $_GET['id'] ) ) {
            $wpdb->delete( $table_event_types, [ 'id' => intval( $_GET['id'] ) ] );
            $message = 'Typ wydarzenia usunięty.';
            $notice_class = 'notice-success';
        }
    }

    // Prepare for form (for editing)
    $item_to_edit = null;
    if ( isset( $_GET['action'], $_GET['id'] ) && $_GET['action'] === 'edit' ) {
        $item_to_edit = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM $table_event_types WHERE id = %d", intval( $_GET['id'] ) ) );
    }

    $event_types = $wpdb->get_results( "SELECT * FROM $table_event_types ORDER BY name ASC" );
    ?>
    <div class="wrap">
        <h1>Typy Wydarzeń</h1>
        <?php if ( ! empty( $message ) ) : ?>
            <div class="notice <?php echo esc_attr( $notice_class ); ?> is-dismissible"><p><?php echo esc_html( $message ); ?></p></div>
        <?php endif; ?>

        <div id="col-container" class="wp-clearfix">
            <div id="col-left">
                <div class="col-wrap">
                    <div class="form-wrap">
                        <h2><?php echo $item_to_edit ? 'Edytuj typ wydarzenia' : 'Dodaj nowy typ wydarzenia'; ?></h2>
                        <form method="post">
                            <input type="hidden" name="event_type_id" value="<?php echo $item_to_edit ? esc_attr( $item_to_edit->id ) : '0'; ?>">
                            <?php wp_nonce_field( 'mystat_manage_event_type' ); ?>
                            <div class="form-field">
                                <label for="event_type_name">Nazwa</label>
                                <input type="text" name="event_type_name" id="event_type_name" value="<?php echo $item_to_edit ? esc_attr( $item_to_edit->name ) : ''; ?>" required>
                            </div>
                            <?php submit_button( $item_to_edit ? 'Zaktualizuj' : 'Dodaj' ); ?>
                        </form>
                    </div>
                </div>
            </div>
            <div id="col-right">
                <div class="col-wrap">
                    <table class="wp-list-table widefat fixed striped">
                        <thead><tr><th>Nazwa</th><th style="width: 100px;">Akcje</th></tr></thead>
                        <tbody>
                            <?php foreach ( $event_types as $type ) : ?>
                                <tr><td><?php echo esc_html( $type->name ); ?></td><td><a href="<?php echo esc_url( add_query_arg( [ 'action' => 'edit', 'id' => $type->id ] ) ); ?>">Edytuj</a> | <a href="<?php echo esc_url( wp_nonce_url( add_query_arg( [ 'action' => 'delete', 'id' => $type->id ] ), 'mystat_delete_event_type_' . $type->id ) ); ?>" onclick="return confirm('Czy na pewno chcesz usunąć ten typ?')" style="color: #a00;">Usuń</a></td></tr>
                            <?php endforeach; ?>
                        </tbody>
                    </table>
                </div>
            </div>
        </div>
    </div>
    <?php
}

function mystat_equipment_page() {
    global $wpdb;
    $table_equipment = $wpdb->prefix . 'mystat_equipment';
    $message = '';
    $notice_class = '';

    // Handle POST requests (add/update)
    if ( isset( $_POST['submit'] ) && check_admin_referer( 'mystat_manage_equipment' ) ) {
        $name = sanitize_text_field( $_POST['equipment_name'] );
        $item_id = isset( $_POST['equipment_id'] ) ? intval( $_POST['equipment_id'] ) : 0;

        if ( ! empty( $name ) ) {
            if ( $item_id > 0 ) { // Update
                $wpdb->update( $table_equipment, [ 'name' => $name ], [ 'id' => $item_id ] );
                $message = 'Sprzęt zaktualizowany.';
                $notice_class = 'notice-success';
            } else { // Insert
                $wpdb->insert( $table_equipment, [ 'name' => $name ] );
                $message = 'Sprzęt dodany.';
                $notice_class = 'notice-success';
            }
        } else {
            $message = 'Nazwa sprzętu nie może być pusta.';
            $notice_class = 'notice-error';
        }
    }

    // Handle GET requests (delete)
    if ( isset( $_GET['action'], $_GET['id'], $_GET['_wpnonce'] ) && $_GET['action'] === 'delete' ) {
        if ( wp_verify_nonce( $_GET['_wpnonce'], 'mystat_delete_equipment_' . $_GET['id'] ) ) {
            $wpdb->delete( $table_equipment, [ 'id' => intval( $_GET['id'] ) ] );
            $message = 'Sprzęt usunięty.';
            $notice_class = 'notice-success';
        }
    }

    // Prepare for form (for editing)
    $item_to_edit = null;
    if ( isset( $_GET['action'], $_GET['id'] ) && $_GET['action'] === 'edit' ) {
        $item_to_edit = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM $table_equipment WHERE id = %d", intval( $_GET['id'] ) ) );
    }

    $equipment_list = $wpdb->get_results( "SELECT * FROM $table_equipment ORDER BY name ASC" );
    ?>
    <div class="wrap">
        <h1>Zarządzaj Sprzętem</h1>
        <?php if ( ! empty( $message ) ) : ?>
            <div class="notice <?php echo esc_attr( $notice_class ); ?> is-dismissible"><p><?php echo esc_html( $message ); ?></p></div>
        <?php endif; ?>

        <div id="col-container" class="wp-clearfix">
            <div id="col-left">
                <div class="col-wrap">
                    <div class="form-wrap">
                        <h2><?php echo $item_to_edit ? 'Edytuj sprzęt' : 'Dodaj nowy sprzęt'; ?></h2>
                        <form method="post">
                            <input type="hidden" name="equipment_id" value="<?php echo $item_to_edit ? esc_attr( $item_to_edit->id ) : '0'; ?>">
                            <?php wp_nonce_field( 'mystat_manage_equipment' ); ?>
                            <div class="form-field">
                                <label for="equipment_name">Nazwa</label>
                                <input type="text" name="equipment_name" id="equipment_name" value="<?php echo $item_to_edit ? esc_attr( $item_to_edit->name ) : ''; ?>" required>
                            </div>
                            <?php submit_button( $item_to_edit ? 'Zaktualizuj' : 'Dodaj' ); ?>
                        </form>
                    </div>
                </div>
            </div>
            <div id="col-right">
                <div class="col-wrap">
                    <table class="wp-list-table widefat fixed striped">
                        <thead><tr><th>Nazwa</th><th style="width: 100px;">Akcje</th></tr></thead>
                        <tbody>
                            <?php foreach ( $equipment_list as $item ) : ?>
                                <tr><td><?php echo esc_html( $item->name ); ?></td><td><a href="<?php echo esc_url( add_query_arg( [ 'action' => 'edit', 'id' => $item->id ] ) ); ?>">Edytuj</a> | <a href="<?php echo esc_url( wp_nonce_url( add_query_arg( [ 'action' => 'delete', 'id' => $item->id ] ), 'mystat_delete_equipment_' . $item->id ) ); ?>" onclick="return confirm('Czy na pewno chcesz usunąć ten sprzęt?')" style="color: #a00;">Usuń</a></td></tr>
                            <?php endforeach; ?>
                        </tbody>
                    </table>
                </div>
            </div>
        </div>
    </div>
    <?php
}

/**
 * Obsługa zapisu nowego wpisu do bazy danych
 */
function mystat_handle_new_entry() {
    global $wpdb;

    // Sprawdź czy formularz został wysłany
    if ( ! isset( $_POST['mystat_submit_activity'] ) ) {
        return;
    }

    // Weryfikacja bezpieczeństwa (Nonce)
    if ( ! isset( $_POST['_wpnonce'] ) || ! wp_verify_nonce( $_POST['_wpnonce'], 'mystat_add_entry' ) ) {
        echo '<div class="notice notice-error"><p>Błąd weryfikacji bezpieczeństwa formularza.</p></div>';
        return;
    }

    $table_activities = $wpdb->prefix . 'mystat_activities';

    // Przygotowanie danych (zamiana przecinka na kropkę w dystansie)
    $distance = isset($_POST['distance']) ? floatval( str_replace( ',', '.', $_POST['distance'] ) ) : 0;
    
    // Funkcja pomocnicza do zamiany pustych wartości na NULL, aby poprawnie zapisać je w bazie
    $null_if_empty = function($value) {
        return $value !== '' ? $value : null;
    };

    $data = array(
        'category_id' => intval( $_POST['category_id'] ),
        'date'        => sanitize_text_field( $_POST['date'] ),
        'title'       => sanitize_text_field( $_POST['title'] ),
        'distance'    => $distance,
        'duration'    => sanitize_text_field( $_POST['duration'] ),
        'calories'    => intval( $_POST['calories'] ),
        'comment'     => sanitize_textarea_field( $_POST['comment'] ),
        'strava_url'  => $null_if_empty( esc_url_raw( $_POST['strava_url'] ) ),
        'avg_heart_rate' => $null_if_empty( intval( $_POST['avg_heart_rate'] ) ),
        'max_heart_rate' => $null_if_empty( intval( $_POST['max_heart_rate'] ) ),
        'avg_speed'   => $null_if_empty( floatval( str_replace( ',', '.', $_POST['avg_speed'] ) ) ),
        'max_speed'   => $null_if_empty( floatval( str_replace( ',', '.', $_POST['max_speed'] ) ) ),
        'avg_cadence' => $null_if_empty( intval( $_POST['avg_cadence'] ) ),
        'max_cadence' => $null_if_empty( intval( $_POST['max_cadence'] ) ),
        'total_elevation_gain' => $null_if_empty( intval( $_POST['total_elevation_gain'] ) ),
        'total_elevation_loss' => $null_if_empty( intval( $_POST['total_elevation_loss'] ) ),
        'min_altitude' => $null_if_empty( intval( $_POST['min_altitude'] ) ),
        'max_altitude' => $null_if_empty( intval( $_POST['max_altitude'] ) ),
        'equipment_id'   => $null_if_empty( intval( $_POST['equipment_id'] ) ),
        'gpx_url'     => $null_if_empty( esc_url_raw( $_POST['gpx_url'] ) ),
        'event_type_id'  => $null_if_empty( intval( $_POST['event_type_id'] ) ),
    );

    // Format danych dla $wpdb->insert
    $format = array( 
        '%d', '%s', '%s', '%f', '%s', '%d', '%s', // Pola podstawowe
        '%s', '%d', '%d', '%f', '%f', '%d', '%d', // Tętno, prędkość, kadencja
        '%d', '%d', '%d', '%d', '%d', '%s', '%d'  // Wysokość, sprzęt, linki, typ wydarzenia
    );

    $result = $wpdb->insert( $table_activities, $data, $format );

    if ( $result ) {
        echo '<div class="notice notice-success is-dismissible"><p>Trening dodany pomyślnie!</p></div>';
    } else {
        echo '<div class="notice notice-error is-dismissible"><p>Wystąpił błąd podczas zapisu do bazy.</p></div>';
    }
}

/**
 * Renderowanie formularza HTML
 */
function mystat_render_add_form() {
    global $wpdb;
    $table_categories = $wpdb->prefix . 'mystat_categories';
    $table_event_types = $wpdb->prefix . 'mystat_event_types';
    $table_equipment = $wpdb->prefix . 'mystat_equipment';
    $categories = $wpdb->get_results( "SELECT * FROM $table_categories ORDER BY name ASC" );
    $event_types = $wpdb->get_results( "SELECT * FROM $table_event_types ORDER BY name ASC" );
    $equipment_list = $wpdb->get_results( "SELECT * FROM $table_equipment ORDER BY name ASC" );
    $today = current_time( 'Y-m-d' );
    ?>
    <div class="postbox">
        <div class="postbox-header"><h2 class="hndle">Dodaj Nową Aktywność</h2></div>
        <div class="inside">
            <form method="post" action="">
                <?php wp_nonce_field( 'mystat_add_entry', '_wpnonce' ); ?>
                <table class="form-table">
                    <tr>
                        <th scope="row"><label for="title">Tytuł</label></th>
                        <td><input type="text" name="title" id="title" class="large-text" placeholder="np. Poranny trening w lesie" required></td>
                    </tr>
                    <tr>
                        <th scope="row"><label for="category_id">Kategoria</label></th>
                        <td>
                            <select name="category_id" id="category_id" required>
                                <?php foreach ( $categories as $cat ) : ?>
                                    <option value="<?php echo esc_attr( $cat->id ); ?>" <?php selected( $cat->name, 'Rower' ); ?>><?php echo esc_html( $cat->name ); ?></option>
                                <?php endforeach; ?>
                            </select>
                        </td>
                    </tr>
                    <tr>
                        <th scope="row"><label for="date">Data</label></th>
                        <td><input type="date" name="date" id="date" value="<?php echo esc_attr( $today ); ?>" class="regular-text" required></td>
                    </tr>
                    <tr>
                        <th scope="row"><label for="distance">Dystans (km)</label></th>
                        <td><input type="text" name="distance" id="distance" class="regular-text" placeholder="0,00"></td>
                    </tr>
                    <tr>
                        <th scope="row"><label for="duration">Czas (HH:MM:SS)</label></th>
                        <td><input type="time" name="duration" id="duration" step="1" value="00:00:00" class="regular-text"></td>
                    </tr>
                    <tr>
                        <th scope="row"><label for="calories">Kalorie (kcal)</label></th>
                        <td><input type="number" name="calories" id="calories" class="regular-text" placeholder="0"></td>
                    </tr>
                    <tr>
                        <th scope="row"><label for="event_type">Typ wydarzenia</label></th>
                        <td>
                            <select name="event_type_id" id="event_type_id">
                                <option value="">-- Wybierz --</option>
                                <?php foreach ( $event_types as $type ) : ?>
                                    <option value="<?php echo esc_attr( $type->id ); ?>" <?php selected( $type->name, 'Trening' ); ?>><?php echo esc_html( $type->name ); ?></option>
                                <?php endforeach; ?>
                            </select>
                        </td>
                    </tr>
                    <tr>
                        <th scope="row"><label for="equipment">Sprzęt</label></th>
                        <td>
                            <select name="equipment_id" id="equipment_id">
                                <option value="">-- Wybierz --</option>
                                <?php foreach ( $equipment_list as $item ) : ?>
                                    <option value="<?php echo esc_attr( $item->id ); ?>"><?php echo esc_html( $item->name ); ?></option>
                                <?php endforeach; ?>
                            </select>
                        </td>
                    </tr>
                    <tr class="form-field">
                        <td colspan="2"><hr><h4>Dane szczegółowe (opcjonalne)</h4></td>
                    </tr>
                    <tr>
                        <th scope="row"><label for="avg_speed">Śr. prędkość (km/h)</label></th>
                        <td><input type="text" name="avg_speed" id="avg_speed" class="small-text" placeholder="0,0"></td>
                    </tr>
                    <tr>
                        <th scope="row"><label for="max_speed">Maks. prędkość (km/h)</label></th>
                        <td><input type="text" name="max_speed" id="max_speed" class="small-text" placeholder="0,0"></td>
                    </tr>
                    <tr>
                        <th scope="row"><label for="avg_heart_rate">Śr. tętno</label></th>
                        <td><input type="number" name="avg_heart_rate" id="avg_heart_rate" class="small-text" placeholder="0"></td>
                    </tr>
                     <tr>
                        <th scope="row"><label for="max_heart_rate">Maks. tętno</label></th>
                        <td><input type="number" name="max_heart_rate" id="max_heart_rate" class="small-text" placeholder="0"></td>
                    </tr>
                    <tr>
                        <th scope="row"><label for="avg_cadence">Śr. rytm pedałowania</label></th>
                        <td><input type="number" name="avg_cadence" id="avg_cadence" class="small-text" placeholder="0"></td>
                    </tr>
                    <tr>
                        <th scope="row"><label for="total_elevation_gain">Całkowity wznios (m)</label></th>
                        <td><input type="number" name="total_elevation_gain" id="total_elevation_gain" class="small-text" placeholder="0"></td>
                    </tr>
                    <tr>
                        <th scope="row"><label for="comment">Komentarz</label></th>
                        <td><textarea name="comment" id="comment" rows="3" class="large-text"></textarea></td>
                    </tr>
                    <tr class="form-field">
                        <td colspan="2"><hr><h4>Linki zewnętrzne (opcjonalne)</h4></td>
                    </tr>
                    <tr>
                        <th scope="row"><label for="strava_url">Link do Strava</label></th>
                        <td><input type="url" name="strava_url" id="strava_url" class="large-text" placeholder="https://www.strava.com/activities/..."></td>
                    </tr>
                </table>
                <p class="submit">
                    <input type="submit" name="mystat_submit_activity" id="submit" class="button button-primary" value="Zapisz Trening">
                </p>
            </form>
        </div>
    </div>
    <?php
}

function mystat_render_history_table() {
    global $wpdb;
    
    // Definicje nazw tabel (z uwzględnieniem prefixu WP, jeśli był użyty przy tworzeniu)
    // Zakładam, że tabele nazywają się dokładnie tak jak w dokumentacji, ale dobrą praktyką jest $wpdb->prefix
    // Jeśli tabele są "sztywne" (bez prefixu wp_), usuń $wpdb->prefix.
    $table_activities = $wpdb->prefix . 'mystat_activities'; 
    $table_categories = $wpdb->prefix . 'mystat_categories';

    // --- 1. OBSŁUGA USUWANIA (DELETE) ---
    if ( isset( $_GET['action'], $_GET['id'], $_GET['_wpnonce'] ) && $_GET['action'] === 'mystat_delete' ) {
        $activity_id = intval( $_GET['id'] );
        
        // Weryfikacja bezpieczeństwa (Nonce)
        if ( wp_verify_nonce( $_GET['_wpnonce'], 'mystat_delete_' . $activity_id ) ) {
            $result = $wpdb->delete( 
                $table_activities, 
                array( 'id' => $activity_id ), 
                array( '%d' ) 
            );

            if ( $result ) {
                echo '<div class="notice notice-success is-dismissible"><p>Aktywność została usunięta.</p></div>';
            } else {
                echo '<div class="notice notice-error is-dismissible"><p>Wystąpił błąd podczas usuwania.</p></div>';
            }
        } else {
            echo '<div class="notice notice-error is-dismissible"><p>Błąd weryfikacji bezpieczeństwa (Nonce).</p></div>';
        }
    }

    // --- 2. POBIERANIE DANYCH (SELECT) ---
    // Pobieramy ostatnie 10 wpisów, łącząc z tabelą kategorii, aby mieć nazwę i ikonę
    $sql = $wpdb->prepare("
        SELECT a.*, c.name as category_name, c.icon, c.color, et.name as event_type_name, eq.name as equipment_name
        FROM $table_activities a
        LEFT JOIN $table_categories c ON a.category_id = c.id
        LEFT JOIN {$wpdb->prefix}mystat_event_types et ON a.event_type_id = et.id
        LEFT JOIN {$wpdb->prefix}mystat_equipment eq ON a.equipment_id = eq.id
        ORDER BY a.date DESC, a.id DESC
        LIMIT %d
    ", 10);
    
    $activities = $wpdb->get_results( $sql );

    // --- 3. WIDOK TABELI (HTML) ---
    ?>
    <div class="wrap">
        <h2>Ostatnie Aktywności</h2>
        
        <table class="wp-list-table widefat fixed striped table-view-list">
            <thead>
                <tr>
                    <th scope="col" style="width: 50px;">Ikona</th>
                    <th scope="col">Data</th>
                    <th scope="col">Tytuł</th>
                    <th scope="col" style="width: 120px;">Kategoria</th>
                    <th scope="col">Typ</th>
                    <th scope="col">Sprzęt</th>
                    <th scope="col">Dystans (km)</th>
                    <th scope="col">Czas</th>
                    <th scope="col">Śr. prędkość</th>
                    <th scope="col" style="width: 80px;">Akcja</th>
                </tr>
            </thead>
            <tbody>
                <?php if ( ! empty( $activities ) ) : ?>
                    <?php foreach ( $activities as $row ) : ?>
                        <?php 
                            // Generowanie URL do usuwania z Nonce
                            $delete_url = add_query_arg( array(
                                'page'      => $_REQUEST['page'], // Zachowaj obecną stronę admina
                                'action'    => 'mystat_delete',
                                'id'        => $row->id,
                                '_wpnonce'  => wp_create_nonce( 'mystat_delete_' . $row->id )
                            ), admin_url( 'admin.php' ) );
                        ?>
                        <tr>
                            <td>
                                <?php if ( ! empty( $row->icon ) ) : ?>
                                    <span class="dashicons <?php echo esc_attr( $row->icon ); ?>" style="color: <?php echo esc_attr( $row->color ); ?>;"></span>
                                <?php endif; ?>
                            </td>
                            <td><?php echo esc_html( $row->date ); ?></td>
                            <td><strong><?php echo esc_html( wp_trim_words( $row->title, 6 ) ); ?></strong></td>
                            <td><?php echo esc_html( $row->category_name ); ?></td>
                            <td><?php echo esc_html( $row->event_type_name ); ?></td>
                            <td><?php echo esc_html( $row->equipment_name ); ?></td>
                            <td><?php echo number_format( $row->distance, 2, ',', ' ' ); ?></td>
                            <td><?php echo esc_html( $row->duration ); ?></td>
                            <td><?php echo $row->avg_speed ? number_format( $row->avg_speed, 1, ',', ' ' ) . ' km/h' : '-'; ?></td>
                            <td>
                                <a href="<?php echo esc_url( $delete_url ); ?>" 
                                   class="button button-small button-link-delete"
                                   onclick="return confirm('Czy na pewno chcesz usunąć ten wpis?');">
                                   Usuń
                                </a>
                            </td>
                        </tr>
                    <?php endforeach; ?>
                <?php else : ?>
                    <tr>
                        <td colspan="10">Brak zarejestrowanych aktywności. Dodaj pierwszy trening powyżej!</td>
                    </tr>
                <?php endif; ?>
            </tbody>
        </table>
    </div>
    <?php
}
?>