/**
 * @file tcp_client.h
 * @brief TCP Client module for transparent transmission with UART3
 */

#ifndef __TCP_CLIENT_H__
#define __TCP_CLIENT_H__

#include <stdint.h>
#include <stdbool.h>

#ifdef __cplusplus
extern "C" {
#endif

/* Default TCP Client settings */
#define TCP_CLIENT_DEFAULT_PORT     8081
#define TCP_CLIENT_DEFAULT_SERVER   "192.168.1.100"

/* Reconnect settings */
#define TCP_CLIENT_RECONNECT_DELAY_MS   3000
#define TCP_CLIENT_MAX_RECONNECT_TRIES  0   /* 0 = infinite */

/* Buffer sizes */
#define TCP_CLIENT_RX_BUFFER_SIZE   512
#define TCP_CLIENT_TX_BUFFER_SIZE   512

/* TCP Client state */
typedef enum {
    TCP_CLIENT_STATE_IDLE,
    TCP_CLIENT_STATE_CONNECTING,
    TCP_CLIENT_STATE_CONNECTED,
    TCP_CLIENT_STATE_DISCONNECTED,
    TCP_CLIENT_STATE_ERROR
} tcp_client_state_t;

/* TCP Client configuration */
typedef struct {
    uint8_t server_ip[4];       /* Server IP address */
    uint16_t server_port;       /* Server port */
    bool auto_reconnect;        /* Auto reconnect on disconnect */
    uint16_t reconnect_interval_ms; /* Reconnect interval */
} tcp_client_config_t;

/* TCP Client status */
typedef struct {
    tcp_client_state_t state;
    uint32_t rx_bytes;
    uint32_t tx_bytes;
    uint32_t reconnect_count;
    uint32_t errors;
} tcp_client_status_t;

/**
 * @brief Initialize TCP Client module
 * @param config Client configuration
 * @return 0 on success, negative on error
 */
int tcp_client_init(const tcp_client_config_t *config);

/**
 * @brief Connect to remote server
 * @return 0 on success, negative on error
 */
int tcp_client_connect(void);

/**
 * @brief Disconnect from server
 * @return 0 on success, negative on error
 */
int tcp_client_disconnect(void);

/**
 * @brief Send data to server
 * @param data Data buffer
 * @param len Data length
 * @return Number of bytes sent, negative on error
 */
int tcp_client_send(const uint8_t *data, uint16_t len);

/**
 * @brief Receive data from server
 * @param data Data buffer
 * @param max_len Maximum length to receive
 * @param timeout_ms Timeout in milliseconds (0 = non-blocking)
 * @return Number of bytes received, 0 if no data, negative on error
 */
int tcp_client_recv(uint8_t *data, uint16_t max_len, uint32_t timeout_ms);

/**
 * @brief Check if connected to server
 * @return true if connected
 */
bool tcp_client_is_connected(void);

/**
 * @brief Update server configuration (for AT command)
 * @param ip Server IP address (4 bytes)
 * @param port Server port
 * @return 0 on success, negative on error
 */
int tcp_client_set_server(const uint8_t *ip, uint16_t port);

/**
 * @brief Get TCP Client status
 * @param status Pointer to status structure
 */
void tcp_client_get_status(tcp_client_status_t *status);

/**
 * @brief Get TCP Client RX StreamBuffer handle for UART integration
 * @return StreamBuffer handle for receiving data from TCP
 */
void *tcp_client_get_rx_stream(void);

/**
 * @brief Get TCP Client TX StreamBuffer handle for UART integration
 * @return StreamBuffer handle for sending data to TCP
 */
void *tcp_client_get_tx_stream(void);

/**
 * @brief TCP Client task function (for FreeRTOS)
 * @param argument Task argument (unused)
 */
void tcp_client_task(void *argument);

#ifdef __cplusplus
}
#endif

#endif /* __TCP_CLIENT_H__ */