chatserver.h

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#ifndef CHATSERVER_H
#define CHATSERVER_H

#include <stddef.h>
typedef char boolean;

#define TRUE 1
#define FALSE 0


#define BACKLOG_SIZE 1000

typedef enum {
  LOGIN_MSG = 0x1,
  LOGOUT_MSG = 0x2,
  TEXT_MSG = 0x3,
  USERNAME_NOT_EXIST = 0x4,
  USER_ALREADY_LOGGED = 0x5,
  USERS_LOGGED_REQUEST = 0x6,
  USERS_LOGGED_RESPONSE = 0x7,
  BROADCAST_MSG = 0x8,
  UKNOWN_MSG_TYPE = 0xFE,
  GENERAL_ERROR = 0xFF
} msg_type_t;


typedef struct connection{
  int socket_discriptor; 
  char *username;        
  char *ip;              
  boolean is_logged_in;  
  struct connection *previous;
  struct connection *next;
} connection_t;

typedef struct client_thread_params {
  connection_t *active_connections_list; 
  connection_t *client_connection;       
} client_thread_params_t;

typedef struct broadcast_invitation_tread_params {
  int port;                             
  char *server_ip;                      
  int refresh_rate;                     
} broadcast_invitation_tread_params_t;
  

int create_tcp_server_socket(int port);

void *print_stats_counters_thread(void *refresh_rate);


void handle_incoming_connections(int server_socket, connection_t *connections_list);


void *handle_client_connection_thread(void *thread_parameter);

msg_type_t get_message_type(char *buffer, size_t buf_len);

int send_to_client_online_users(connection_t *connections_list,
                                connection_t *client_connection);

boolean handle_login_message(connection_t *connections_list,
                             connection_t *client_connection,
                             char *buffer,
                             size_t buf_len);

boolean handle_logout_message(connection_t *connections_list, connection_t *client_connection);


int handle_text_message(connection_t *connections_list,
                        connection_t *client_connection,
                        char *buffer,
                        size_t buf_len);

int send_back_error_message(connection_t *client_connection,
                            msg_type_t error_type,
                            char *msg_content,
                            size_t msg_content_len);

void *broadcast_invitation_tread(void *broadcast_params);

#endif