<?php
require_once 'db/config.php';

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $processId = $_POST['process_id'] ?? null;
    $name = $_POST['name'];
    $definition_json = $_POST['definition_json'];

    if (empty($name)) {
        die('Process name is required.');
    }

    // Validate JSON
    if (!empty($definition_json)) {
        json_decode($definition_json);
        if (json_last_error() !== JSON_ERROR_NONE) {
            die('Invalid JSON format in definition.');
        }
    }

    try {
        $pdo = db();

        if (empty($processId)) {
            // Create new process
            $sql = 'INSERT INTO process_definitions (name, definition_json) VALUES (?, ?)';
            $params = [$name, $definition_json];
            $message = 'Process created successfully.';
        } else {
            // Update existing process
            $sql = 'UPDATE process_definitions SET name = ?, definition_json = ? WHERE id = ?';
            $params = [$name, $definition_json, $processId];
            $message = 'Process updated successfully.';
        }

        $stmt = $pdo->prepare($sql);
        $stmt->execute($params);

        session_start();
        $_SESSION['success_message'] = $message;

    } catch (PDOException $e) {
        error_log('Save process definition failed: ' . $e->getMessage());
        die('Save process definition failed. Please check the logs.');
    }

    header('Location: process_definitions.php');
    exit();
}