#pragma once
#include <cstdint>
#include <functional>
#include <mutex>
#include <string>
#include <unordered_map>
namespace svapi {
class RateLimiter {
public:
    RateLimiter();
    bool allow(const std::string& keyId, uint32_t limitPerMin); // true if under limit; 0 = unlimited
    void setClockForTesting(std::function<int64_t()> fn);
private:
    struct Window { int64_t minute = -1; uint32_t count = 0; };
    std::unordered_map<std::string, Window> windows_;
    std::function<int64_t()> now_;   // epoch seconds
    std::mutex mu_;
};
RateLimiter& rateLimiter();  // process singleton
}