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#pragma once
#include <cstring>
#include <fcntl.h>
#include <iostream>
#include <optional>
#include <pthread.h>
#include <string>
#include <sys/mman.h>
#include <unistd.h>
#include "shared_memory.h"
/**
* @class Client
* @brief Represents the client, which performs actions on the hashtable of the server.
*/
class Client {
public:
/**
* @brief Constructs a new client and opens the shared memory.
*/
Client();
/**
* @brief Unmaps the shared memory.
*/
~Client();
/**
* @brief Main client program.
*
* @details The user can choose the operation and the arguments, which will be sent to the
* server.
*/
void start_client();
private:
/**
* @brief Memory which is shared with the server.
*/
SharedMemory* shared_memory;
/**
* @brief File descriptor for the shared memory, used to unmap and close the memory at the end.
*/
int shm_fd;
/**
* @brief Sends a request to the server.
*
* @param shared_memory The memory to use.
* @param type The type of the operation the server has to process.
* @param k First potential argument of the request, represents the key.
* @param v Second potential argument of the request, represent the value.
* @return int The index of the request in the circular-buffer, so we can access it again for
* processing the respond.
*/
int send_request(
SharedMemory* shared_memory,
Operations type,
std::optional<const std::string> k,
std::optional<const std::string> v);
/**
* @brief Determines if the request was processed by the server.
*
* @param shared_memory The memory to use.
* @param index The index of the request in the circular-buffer.
* @return bool The request was processed by the server.
*/
bool request_processed(SharedMemory* shared_memory, int index);
/**
* @brief Processes the respond of the server.
*
* @param shared_memory The memory to use.
* @param index The index of the request in the circular-buffer.
* @return std::string The response of the server as a string.
*/
std::string process_respond(SharedMemory* shared_memory, int index);
};
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