/*
creg - Code compoment registration system
Copyright 2005 Jelmer Cnossen 
*/
#include "StdAfx.h"
#include "creg.h"
#include <map>
#include <string.h>

using namespace creg;
using namespace std;

static map<string, Class*> mapNameToClass;
static int currentMemberFlags = 0; // used when registering class members

// -------------------------------------------------------------------
// Class Binder
// -------------------------------------------------------------------

ClassBinder* System::binderList = 0;
vector<Class*> System::classes;

ClassBinder::ClassBinder (const char *className, unsigned int cf, ClassBinder* baseClsBinder, IMemberRegistrator** mreg, int instanceSize, void (*constructorProc)(void *Inst), void (*destructorProc)(void *Inst))
{
	class_ = 0;
	name = className;
	memberRegistrator = mreg;
	constructor = constructorProc;
	destructor = destructorProc;
	base = baseClsBinder;
	size = instanceSize;
	flags = (ClassFlags)cf;

	// link to the list of class binders
	System::AddClassBinder(this);
}

void System::InitializeClasses ()
{
	// Create Class instances
	for (ClassBinder *c = binderList; c; c = c->nextBinder)
		c->class_ = SAFE_NEW Class;

	// Initialize class instances
	for (ClassBinder *c = binderList; c; c = c->nextBinder) {
		Class *cls = c->class_;

		cls->binder = c;
		cls->name = c->name;
		cls->base = c->base ? c->base->class_ : 0;
		mapNameToClass [cls->name] = cls;

		if (cls->base)
			cls->base->derivedClasses.push_back(cls);

		currentMemberFlags = 0;
		// Register members
		if (*c->memberRegistrator)
			(*c->memberRegistrator)->RegisterMembers (cls);

		classes.push_back (cls);
	}
}

void System::FreeClasses ()
{
	for (uint a=0;a<classes.size();a++)
		delete classes[a];
	classes.clear();
}

Class* System::GetClass (const string& name)
{
	map<string, Class*>::iterator c = mapNameToClass.find (name);
	if (c == mapNameToClass.end()) 
		return 0;
	return c->second;
}

void System::AddClassBinder(ClassBinder *cb)
{
	cb->nextBinder = binderList;
	binderList = cb;
}

// ------------------------------------------------------------------
// creg::Class: Class description
// ------------------------------------------------------------------

Class::Class () : 
	binder (0),
	base (0),
	serializeProc(0),
	postLoadProc(0)
{}

Class::~Class ()
{
	for (unsigned int a=0;a<members.size();a++)
		delete members[a];
	members.clear();
}

bool Class::IsSubclassOf (Class *other)
{
	for (Class *c = this; c; c = c->base)
		if (c == other) return true;

	return false;
}

std::vector<Class*> Class::GetImplementations()
{
	std::vector<Class*> classes;

	for (unsigned int a=0;a<derivedClasses.size();a++)
	{
		Class* dc = derivedClasses[a];
		if (!dc->IsAbstract())
			classes.push_back(dc);

		std::vector<Class*> impl = dc->GetImplementations();
		classes.insert(classes.end(), impl.begin(), impl.end());
	}

	return classes;
}

void Class::BeginFlag (ClassMemberFlag flag)
{
	currentMemberFlags |= (int)flag;
}

void Class::EndFlag (ClassMemberFlag flag)
{
	currentMemberFlags &= ~(int)flag;
}

void Class::AddMember (const char *name, IType* type, unsigned int offset)
{
	Member *member = new Member;

	member->name = name;
	member->offset = offset;
	member->type = type;
	member->flags = currentMemberFlags;

	members.push_back (member);
}

Class::Member* Class::FindMember (const char *name)
{
	for (Class *c = this; c; c=c->base) 
		for (uint a=0;a<c->members.size();a++) {
			Member *member = c->members[a];
			if (!STRCASECMP(member->name, name))
				return member;
		}
	return 0;
}

void Class::SetMemberFlag (const char *name, ClassMemberFlag f)
{
	for (uint a=0;a<members.size();a++)
		if (!strcmp (members[a]->name, name)) {
			members[a]->flags |= (int)f;
			break;
		}
}

void Class::SerializeInstance (ISerializer *s, void *ptr)
{
	if (base)
		base->SerializeInstance (s, ptr);

	for (uint a=0;a<members.size();a++)
	{
		creg::Class::Member* m = members [a];
		if (m->flags & CM_NoSerialize)
			continue;

		void *memberAddr = ((char*)ptr) + m->offset;
/*		if (s->IsWriting ())
			printf ("writing %s at %d\n", m->name,  (int)((COutputStreamSerializer *)s)->stream->tellp ());
		else
			printf ("reading %s at %d\n", m->name,  (int)((CInputStreamSerializer *)s)->stream->tellg ());*/
		m->type->Serialize (s, memberAddr);
	}

	if (serializeProc) {
		_DummyStruct *obj = (_DummyStruct*)ptr;
		(obj->*serializeProc)(*s);
	}
}

void* Class::CreateInstance()
{
	void *inst = ::operator new(binder->size);
	if (binder->constructor) binder->constructor (inst);
	return inst;
}

void Class::DeleteInstance (void *inst)
{
	if (binder->destructor) binder->destructor(inst);
	::operator delete(inst);
}

static void StringHash(const std::string &str, unsigned int hash)
{
	unsigned int a = 63689;
	for(std::string::const_iterator si = str.begin(); si != str.end(); ++si)
	{
		hash = hash * a + (*si);
		a *= 378551;
	}
}

void Class::CalculateChecksum (unsigned int& checksum)
{
	for (int a=0;a<members.size();a++)
	{
		Member *m = members[a];
		checksum += m->flags;
		StringHash(m->name, checksum);
	}
	if (base)
		base->CalculateChecksum(checksum);
}


IType::~IType() {
}

IMemberRegistrator::~IMemberRegistrator() {
}