#pragma once
#include "tlibc/errors.h"
#include "tlibc/magic.h"
#include "tcp-chat/common_constants.h"

#define AES_SESSION_KEY_SIZE 32

extern const Magic64 PacketHeader_MAGIC;

// sizeof(PacketHeader) must be 64 
typedef struct PacketHeader {
    Magic64 magic;
    u8 protocol_version;
    u8 _reserved1;
    u16 type;
    u32 _reserved4;
    /* size of request/response struct */
    u64 content_size;
} ATTRIBUTE_ALIGNED(64) PacketHeader;

void PacketHeader_construct(PacketHeader* ptr, u8 protocol_version, u16 type, u64 content_size);
Result(void) PacketHeader_validateMagic(PacketHeader* ptr);
Result(void) PacketHeader_validateType(PacketHeader* ptr, u16 expected_type);
Result(void) PacketHeader_validateContentSize(PacketHeader* ptr, u64 expected_size);