<?php
/**
 * Plugin Name: Statinform: Cookieless Analytics (No Consent Banner)
 * Description: Lightweight, privacy-friendly analytics for WordPress. No cookies, no external services, minimal server load.
 * Version:     1.0.0
 * Author:      einform
 * Author URI:  https://e-inform.by
 * License:     GPLv2 or later
 * License URI: https://www.gnu.org/licenses/gpl-2.0.html
 * Text Domain: statinform
 * Requires at least: 6.0
 * Requires PHP: 7.4
 *
 * @package Statinform
 */

if (!defined('ABSPATH')) exit;

define('EISTAT_VERSION', '1.0.0');
define('EISTAT_DIR', plugin_dir_path(__FILE__));
define('EISTAT_URL', plugin_dir_url(__FILE__));

/**
 * Absolute path to the plugin's data folder inside uploads/.
 *
 * @return string Path with a trailing slash.
 */
function eistat_get_data_dir() {
    $upload = wp_upload_dir();
    return rtrim($upload['basedir'], '/') . '/eistat/';
}

/**
 * Public URL of the plugin's data folder inside uploads/.
 *
 * @return string URL with a trailing slash.
 */
function eistat_get_data_url() {
    $upload = wp_upload_dir();
    return rtrim($upload['baseurl'], '/') . '/eistat/';
}

/**
 * Absolute path to the buffer directory.
 *
 * The path is cached in buffer-path.json next to the buffer itself.
 * The file contains a plain JSON string with the absolute path; it is
 * not PHP code and can be read with file_get_contents().
 *
 * @return string Path with a trailing slash.
 */
function eistat_get_buffer_dir() {
    static $cached = null;
    if ($cached !== null) return $cached;

    $data_dir    = eistat_get_data_dir();
    $buffer_dir  = $data_dir . 'buffer/';
    $config_file = $data_dir . 'buffer-path.json';

    if (file_exists($config_file)) {
        $raw = @file_get_contents($config_file);
        if (is_string($raw) && $raw !== '') {
            $path = json_decode(trim($raw), true);
            if (is_string($path) && $path !== '' && is_dir($path)) {
                $cached = rtrim($path, '/') . '/';
                return $cached;
            }
        }
    }

    if (!is_dir($buffer_dir)) {
        wp_mkdir_p($buffer_dir);
    }

    @file_put_contents($config_file, wp_json_encode($buffer_dir));

    $cached = $buffer_dir;
    return $cached;
}

/**
 * Absolute path to the archive directory.
 *
 * @return string Path with a trailing slash.
 */
function eistat_get_archive_dir() {
    return eistat_get_data_dir() . 'archives/';
}

require_once EISTAT_DIR . 'includes/class-eistat-installer.php';
require_once EISTAT_DIR . 'includes/class-eistat-aggregator.php';
require_once EISTAT_DIR . 'includes/class-eistat-exporter.php';

register_activation_hook(__FILE__,   ['EISTAT_Installer', 'activate']);
register_deactivation_hook(__FILE__, ['EISTAT_Installer', 'deactivate']);

// --- Cron: 10-minute interval ---
add_filter('cron_schedules', function ($s) {
    $s['eistat_ten_minutes'] = [
        'interval' => 600,
        'display'  => __('Every 10 minutes', 'statinform'),
    ];
    return $s;
});

add_action('init', function () {
    if (!wp_next_scheduled('eistat_aggregate_event')) {
        wp_schedule_event(time() + 60, 'eistat_ten_minutes', 'eistat_aggregate_event');
    }
});

add_action('eistat_aggregate_event', function () {
    $result = EISTAT_Aggregator::run();
    if ($result !== false) {
        update_option('eistat_last_aggregation_ts', time());
    }
});

/**
 * Detect the current page type for analytics.
 *
 * @return string
 */
function eistat_detect_page_type() {
    if (is_singular('post')) return 'post';
    if (is_page())           return 'page';
    if (is_category())       return 'category';
    if (is_tag())            return 'tag';
    if (is_tax())            return 'tax';
    if (is_archive())        return 'archive';
    if (is_home())           return 'home';
    if (is_search())         return 'search';
    if (is_404())            return '404';
    return 'other';
}

// --- Front-end tracker ---
add_action('wp_enqueue_scripts', function () {
    if (is_admin()) return;

    wp_enqueue_script(
        'eistat-tracker',
        EISTAT_URL . 'public/tracker.js',
        [],
        EISTAT_VERSION,
        true
    );

    $request_uri = isset($_SERVER['REQUEST_URI'])
        ? sanitize_text_field(wp_unslash($_SERVER['REQUEST_URI']))
        : '/';

    wp_localize_script('eistat-tracker', 'EISTAT_CONFIG', [
        'endpoint'  => eistat_get_data_url() . 'collect.php',
        'page_id'   => (int) get_queried_object_id(),
        'page_type' => eistat_detect_page_type(),
        'page_url'  => substr($request_uri, 0, 255),
    ]);
});

// --- Admin menu ---
add_action('admin_menu', function () {
    add_menu_page(
        __('Analytics', 'statinform'),
        __('Analytics', 'statinform'),
        'manage_options',
        'eistat-dashboard',
        function () { require EISTAT_DIR . 'admin/dashboard.php'; },
        'dashicons-chart-bar',
        30
    );
});

// --- "Update now" button handler ---
add_action('admin_post_eistat_run_aggregator', function () {
    if (!current_user_can('manage_options')) {
        wp_die(esc_html__('Access denied.', 'statinform'));
    }
    check_admin_referer('eistat_run_aggregator');

    $start  = microtime(true);
    $result = EISTAT_Aggregator::run(true);
    $elapsed = round((microtime(true) - $start) * 1000);

    $result_int = ($result === false) ? -1 : (int)$result;

    update_option('eistat_last_manual_run',        current_time('mysql'));
    update_option('eistat_last_manual_run_ms',     $elapsed);
    update_option('eistat_last_manual_run_result', $result_int);

    if ($result !== false) {
        update_option('eistat_last_aggregation_ts', time());
    }

    wp_safe_redirect(add_query_arg([
        'page'           => 'eistat-dashboard',
        'eistat_updated' => '1',
    ], admin_url('admin.php')));
    exit;
});

// --- Archive download ---
add_action('admin_post_eistat_download_archive', function () {
    if (!current_user_can('manage_options')) {
        wp_die(esc_html__('Access denied.', 'statinform'));
    }
    check_admin_referer('eistat_download_archive');

    $name = isset($_GET['name'])
        ? sanitize_file_name(wp_unslash($_GET['name']))
        : '';

    EISTAT_Exporter::download_archive($name);
});

// --- CSV export ---
add_action('admin_post_eistat_export_csv', function () {
    if (!current_user_can('manage_options')) {
        wp_die(esc_html__('Access denied.', 'statinform'));
    }
    check_admin_referer('eistat_export_csv');

    $table = isset($_POST['table'])
        ? sanitize_key(wp_unslash($_POST['table']))
        : '';
    $from  = isset($_POST['from'])
        ? sanitize_text_field(wp_unslash($_POST['from']))
        : '';
    $to    = isset($_POST['to'])
        ? sanitize_text_field(wp_unslash($_POST['to']))
        : '';

    if (!preg_match('/^\d{4}-\d{2}-\d{2}$/', $from) || !preg_match('/^\d{4}-\d{2}-\d{2}$/', $to)) {
        wp_die(esc_html__('Invalid period.', 'statinform'));
    }

    EISTAT_Exporter::download_csv($table, $from, $to);
});



// --- Admin assets ---
add_action('admin_enqueue_scripts', function ($hook) {
    if ($hook !== 'toplevel_page_eistat-dashboard') {
        return;
    }

    wp_enqueue_style(
        'eistat-admin',
        EISTAT_URL . 'assets/admin.css',
        [],
        EISTAT_VERSION
    );
});