/*
 * lwftpc.h
 *
 *  Created on: Feb 20, 2024
 *      Author: "SeungJu Lim"
 */

#include <string.h>
#include "lwip/api.h"

#ifdef __cplusplus
#include <cstdio>
#include <cstring>
#include <cstdarg>
#include <cstdlib>
#else
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#endif


#ifdef __cplusplus
extern "C" {
#endif

#ifndef LWFTPC_H_
#define LWFTPC_H_

typedef struct lwftp_session lwftp_session_t;

/** Timeout */
#define FTP_TIMEOUT 10000

/** Setting for LwFTP debug print */
#define LWFTP_DEBUG 1

/** Callback functions */
typedef void (*lwftp_data_callback_t)(lwftp_session_t *s, char *filename,
		char *data);
void lwftp_store_callback(lwftp_session_t *s, char *filename, char *data);
void lwftp_retrieve_callback(lwftp_session_t *s, char *filename, char *data);
void lwftp_list_callback(lwftp_session_t *s, char *filename, char *outStr);




/** Connection state enums */
typedef enum {
	LWFTP_CLOSED = 0,
	LWFTP_CONNECTED,
	LWFTP_USER_SENT,
	LWFTP_PASS_SENT,
	LWFTP_LOGGED,
	LWFTP_PASV_SENT,
	LWFTP_PASV_MODE,
	LWFTP_LIST_SENT,
	LWFTP_RETR_SENT,
	LWFTP_STOR_SENT,
} control_state_t;

typedef enum {
	LWFTP_DATA_CLOSED = 0,
	LWFTP_DATA_XFER_READY,
	LWFTP_DATA_XFERING,
	LWFTP_DATA_XFER_COMPLETE,
} data_state_t;

/** Session structure */
typedef struct lwftp_session {
  // user data
  char    							*user;
  char    							*pass;
  ip_addr_t     				cli_ip;
  ip_addr_t     				svr_ip;
  u16_t         				svr_port;
  u16_t         				data_port;
  // connection data
  struct netconn    		*conn;
  struct netconn    		*data_conn;
  control_state_t				ctrl_state;
  data_state_t					data_state;
  // callback things
  lwftp_data_callback_t data_callback;
  char 									*filename;
  char 									*data;
  char									**outStr;
  // semaphore things
  SemaphoreHandle_t			xfer_semaphore;
  err_t									result;
} lwftp_session_t;




/** Control & Data threads */
void lwftp_ctrl_thread(void *arg);
void lwftp_data_thread(void *arg);

/** FTP Commands */
err_t lwftp_store(lwftp_session_t *s, char *filename, char *data);
err_t lwftp_retrieve(lwftp_session_t *s, char *filename);
err_t lwftp_list(lwftp_session_t *s, char **outStr);
err_t lwftp_close(lwftp_session_t *s);

/** Transfer cmd & Open data port */
err_t lwftp_send(struct netconn *conn, char *data);
err_t lwftp_send_pasv(lwftp_session_t *s);
err_t lwftp_login(lwftp_session_t *s);
err_t lwftp_data_open(lwftp_session_t *s, char *response);

/** Data reception */
void onDataReceived(lwftp_session_t *s, void *data, size_t size);

/** Utilities */
void resetSession(lwftp_session_t *s);
char** extractFileNames(const char *input, int *fileCount);
char* genUniqFilName(char **fileNames, int fileCount,
		const char *targetFileName);

/** Debugging print */
void debugPrint(const char *format, ...);




#ifdef __cplusplus
}
#endif

#endif /* LWFTPC_H_ */