<?php
session_start();
require_once 'WorkflowEngine.php';

if (!isset($_SESSION['user_id'])) {
    $_SESSION['error_message'] = "Authentication required.";
    header('Location: login.php');
    exit();
}
$userId = $_SESSION['user_id']; 

$personId = $_GET['personId'] ?? null;
$processDefinitionId = $_GET['processId'] ?? null;

if (!$personId || !$processDefinitionId) {
    $_SESSION['error_message'] = "Missing parameters for process initialization.";
    header('Location: index.php');
    exit();
}

$engine = new WorkflowEngine();
$instance = $engine->getOrCreateInstanceByDefId($personId, $processDefinitionId, $userId);

if ($instance) {
    $_SESSION['success_message'] = "Process initialized successfully.";
} else {
    $_SESSION['error_message'] = "Failed to initialize process.";
}

header('Location: index.php');
exit();