#ifndef ETHERLIB_TCP_WINDOW_H
#define ETHERLIB_TCP_WINDOW_H

#include <stdint.h>
#include "../../../memory_pool.h"

/**
 * TCP segment descriptor
 */
typedef struct TcpWindowSegment_ {
    uint32_t seqNum; ///< sequence number (sequence number of the first octet)
    uint32_t size; ///< segment size
    struct TcpWindowSegment_ * next; ///< pointer to next window segment
    uint8_t data[]; ///< Segment data
} TcpWindowSegment;

// TODO TODO TODO...

/**
 * TCP Window
 */
typedef struct {
    TcpWindowSegment * firstSeg, *lastSeg; ///< Linked list ends of sequential segments
    MP *mp; ///< Memory Pool for segment management
    uint8_t data[]; ///< Window data storage
} TcpWindow;

/**
 * Create new TCP Window object.
 * @param size
 * @return pointer to newly created TCP Window OR NULL on failure
 */
TcpWindow * tcpw_create(uint32_t size);

/**
 * Get maximum allocable TCP window size. (Cannot store bigger incoming contiguous data blocks.)
 * @param tcpw pointer to TCP Window object
 * @return maximum size of TCP segment window
 */
uint32_t tcpw_get_max_window_size(TcpWindow * tcpw);

/**
 * Store TCP segment
 * @param tcpw pointer to TCP Window object
 * @param data data to store
 * @param size data size in bytes
 * @param seqNum sequence number of first octet of the block
 * @return pointer to TcpWindowSegment allocated in the window OR NULL on failure
 */
TcpWindowSegment * tcpw_store_segment(TcpWindow * tcpw, const uint8_t * data, uint32_t size, uint32_t seqNum);

/**
 * Acknowledge segment.
 * @param tcpw pointer to TCP Window structure
 * @param ackNum acknowledgement number
 * @return acknowledge success
 */
bool tcpw_acknowledge(TcpWindow * tcpw, uint32_t ackNum);

#endif //ETHERLIB_TCP_WINDOW_H