#pragma once
#include <string>
#include <functional>
#include <vector>

namespace MockDDS {

// Richer mock for migration smoke-tests:
// - publish(topic, payload)
// - subscribe(topic, callback) -> subscription id
// - unsubscribe(topic, subscription id)
// - take_last(topic), get_queue(topic)
// - clear_all()
// - sequence numbers per topic (as simple integer appended to payload meta)

using Subscriber = std::function<void(const std::string &payload)>;
using SubscriptionId = unsigned long;

void publish(const std::string &topic, const std::string &msg);
SubscriptionId subscribe(const std::string &topic, Subscriber cb);
void unsubscribe(const std::string &topic, SubscriptionId id);
std::string take_last(const std::string &topic);
std::vector<std::string> get_queue(const std::string &topic);
void clear_all();

}