/*
 * =====================================================================================
 *
 *       Filename:  msg.cpp
 *
 *    Description:  
 *
 *        Version:  1.0
 *        Created:  2021年03月24日 16时48分42秒
 *       Revision:  none
 *       Compiler:  gcc
 *
 *         Author:  Li Chao (), 
 *   Organization:  
 *
 * =====================================================================================
 */
#include "msg.h"
#include "bh_util.h"

namespace bhome_msg
{
/*TODO change msg format, header has proc info;
reply has errer msg
    center accept request and route.;
//*/
const uint32_t kMsgTag = 0xf1e2d3c4;

void *MsgI::Alloc(SharedMemory &shm, const size_t size)
{
	void *p = shm.Alloc(sizeof(Meta) + size);
	if (p) {
		auto pmeta = new (p) Meta;
		p = pmeta + 1;
	}
	return p;
}
void MsgI::Free(SharedMemory &shm)
{
	assert(valid());
	shm.Dealloc(meta());
	ptr_ = nullptr;
	assert(!valid());
}

void *MsgI::Pack(SharedMemory &shm,
                 const uint32_t head_len, const ToArray &headToArray,
                 const uint32_t body_len, const ToArray &bodyToArray)
{
	void *addr = Alloc(shm, sizeof(head_len) + head_len + sizeof(body_len) + body_len);
	if (addr) {
		auto p = static_cast<char *>(addr);
		auto Pack1 = [&p](auto len, auto &writer) {
			Put32(p, len);
			p += sizeof(len);
			writer(p, len);
			p += len;
		};
		Pack1(head_len, headToArray);
		Pack1(body_len, bodyToArray);
	}
	return addr;
}

bool MsgI::ParseHead(BHMsgHead &head) const
{
	auto p = get<char>();
	assert(p);
	uint32_t msg_size = Get32(p);
	p += 4;
	return head.ParseFromArray(p, msg_size);
}

bool MsgI::Make(SharedMemory &shm, void *p)
{
	if (!p) {
		return false;
	}
	MsgI(p).swap(*this);
	return true;
}

int MsgI::Release(SharedMemory &shm)
{
	if (!valid()) {
		return 0;
	}
	auto n = meta()->count_.Dec();
	if (n == 0) {
		Free(shm);
	}
	return n;
}

} // namespace bhome_msg