#pragma once
#include "freertos/FreeRTOS.h"
#include "freertos/event_groups.h"
#include <memory>

typedef bool(*FilterFunc)(const char* const& key);
typedef void (*KeyValueProcessor)(void* arg, const char* const& key, const char* const& value);

class KVStorageHandler {
public:
  virtual ~KVStorageHandler() = default;

  virtual void init(const EventGroupHandle_t& system_event_group) = 0;

  // Store a key-value pair
  virtual void put(const char* const& key, const char* const& value) = 0;

  // Retrieve a value by key, returns nullptr if key not found
  // The caller is responsible for freeing the returned memory
  virtual std::unique_ptr<char[]> get(const char* const& key) const = 0;
  virtual esp_err_t process_all(KeyValueProcessor processor, void* arg) const = 0;
  virtual esp_err_t process_filtered(const char* const& key_prefix, KeyValueProcessor processor, void* arg) const = 0;
  virtual esp_err_t process_filtered(FilterFunc filter_func, KeyValueProcessor processor, void* arg) const = 0;

  // Delete a key-value pair
  virtual void remove(const char* const& key) = 0;
};