<?php
/*
Plugin Name: Simple Otel
Description: Integrate OpenTelemetry with WordPress.
Version: 1.0
Author: Colin
*/

// Ensure the autoload file is included
require_once __DIR__ . '/vendor/autoload.php';

use OpenTelemetry\SDK\Trace\TracerProviderFactory;
use OpenTelemetry\SDK\Common\Util\ShutdownHandler;

// Include configuration file
if (file_exists(__DIR__ . '/config.php')) {
    include __DIR__ . '/config.php';
}

function otel_init() {
    $tracerProvider = (new TracerProviderFactory())->create();
    $GLOBALS['tracer'] = $tracerProvider->getTracer('wordpress');

    $shutdownHandler = new ShutdownHandler($tracerProvider);
    register_shutdown_function([$shutdownHandler, 'shutdown']);
}
add_action('init', 'otel_init');

function otel_trace_example() {
    $tracer = $GLOBALS['tracer'];
    $span = $tracer->startAndActivateSpan('example-span');

    // Your custom code

    $tracer->endActiveSpan();
}
add_action('wp_head', 'otel_trace_example');
?>