/* see copyright notice in squirrel.h */
#include <new>
#include <squirrel.h>
#include <sqstdio.h>
#include <string.h>
#include <sqstdblob.h>
#include "sqstdstream.h"
#include "sqstdblobimpl.h"

#define SQSTD_BLOB_TYPE_TAG (SQSTD_STREAM_TYPE_TAG | 0x00000002)

//Blob


#define SETUP_BLOB(v) \
	SQBlob *self = NULL; \
	{ if(SQ_FAILED(sq_getinstanceup(v,1,(SQUserPointer*)&self,(SQUserPointer)SQSTD_BLOB_TYPE_TAG))) \
		return SQ_ERROR; }


static SQInteger _blob_resize(HSQUIRRELVM v)
{
	SETUP_BLOB(v);
	SQInteger size;
	sq_getinteger(v,2,&size);
	if(!self->Resize(size))
		return sq_throwerror(v,_SC("resize failed"));
	return 0;
}

static void __swap_dword(unsigned int *n)
{
	*n=(unsigned int)(((*n&0xFF000000)>>24)  |
			((*n&0x00FF0000)>>8)  |
			((*n&0x0000FF00)<<8)  |
			((*n&0x000000FF)<<24));
}

static void __swap_word(unsigned short *n)
{
	*n=(unsigned short)((*n>>8)&0x00FF)| ((*n<<8)&0xFF00);
}

static SQInteger _blob_swap4(HSQUIRRELVM v)
{
	SETUP_BLOB(v);
	SQInteger num=(self->Len()-(self->Len()%4))>>2;
	unsigned int *t=(unsigned int *)self->GetBuf();
	for(SQInteger i = 0; i < num; i++) {
		__swap_dword(&t[i]);
	}
	return 0;
}

static SQInteger _blob_swap2(HSQUIRRELVM v)
{
	SETUP_BLOB(v);
	SQInteger num=(self->Len()-(self->Len()%2))>>1;
	unsigned short *t = (unsigned short *)self->GetBuf();
	for(SQInteger i = 0; i < num; i++) {
		__swap_word(&t[i]);
	}
	return 0;
}

static SQInteger _blob__set(HSQUIRRELVM v)
{
	SETUP_BLOB(v);
	SQInteger idx,val;
	sq_getinteger(v,2,&idx);
	sq_getinteger(v,3,&val);
	if(idx < 0 || idx >= self->Len())
		return sq_throwerror(v,_SC("index out of range"));
	((unsigned char *)self->GetBuf())[idx] = (unsigned char) val;
	sq_push(v,3);
	return 1;
}

static SQInteger _blob__get(HSQUIRRELVM v)
{
	SETUP_BLOB(v);
	SQInteger idx;
	sq_getinteger(v,2,&idx);
	if(idx < 0 || idx >= self->Len())
		return sq_throwerror(v,_SC("index out of range"));
	sq_pushinteger(v,((unsigned char *)self->GetBuf())[idx]);
	return 1;
}

static SQInteger _blob__nexti(HSQUIRRELVM v)
{
	SETUP_BLOB(v);
	if(sq_gettype(v,2) == OT_NULL) {
		sq_pushinteger(v, 0);
		return 1;
	}
	SQInteger idx;
	if(SQ_SUCCEEDED(sq_getinteger(v, 2, &idx))) {
		if(idx+1 < self->Len()) {
			sq_pushinteger(v, idx+1);
			return 1;
		}
		sq_pushnull(v);
		return 1;
	}
	return sq_throwerror(v,_SC("internal error (_nexti) wrong argument type"));
}

static SQInteger _blob__typeof(HSQUIRRELVM v)
{
	sq_pushstring(v,_SC("blob"),-1);
	return 1;
}

static SQInteger _blob_releasehook(SQUserPointer p, SQInteger size)
{
	SQBlob *self = (SQBlob*)p;
	delete self;
	return 1;
}

static SQInteger _blob_constructor(HSQUIRRELVM v)
{
	SQInteger nparam = sq_gettop(v);
	SQInteger size = 0;
	if(nparam == 2) {
		sq_getinteger(v, 2, &size);
	}
	if(size < 0) return sq_throwerror(v, _SC("cannot create blob with negative size"));
	SQBlob *b = new SQBlob(size);
	if(SQ_FAILED(sq_setinstanceup(v,1,b))) {
		delete b;
		return sq_throwerror(v, _SC("cannot create blob with negative size"));
	}
	sq_setreleasehook(v,1,_blob_releasehook);
	return 0;
}

#define _DECL_BLOB_FUNC(name,nparams,typecheck) {_SC(#name),_blob_##name,nparams,typecheck}
static SQRegFunction _blob_methods[] = {
	_DECL_BLOB_FUNC(constructor,-1,_SC("xn")),
	_DECL_BLOB_FUNC(resize,2,_SC("xn")),
	_DECL_BLOB_FUNC(swap2,1,_SC("x")),
	_DECL_BLOB_FUNC(swap4,1,_SC("x")),
	_DECL_BLOB_FUNC(_set,3,_SC("xnn")),
	_DECL_BLOB_FUNC(_get,2,_SC("xn")),
	_DECL_BLOB_FUNC(_typeof,1,_SC("x")),
	_DECL_BLOB_FUNC(_nexti,2,_SC("x")),
	{0,0,0,0}
};



//GLOBAL FUNCTIONS

static SQInteger _g_blob_casti2f(HSQUIRRELVM v)
{
	SQInteger i;
	sq_getinteger(v,2,&i);
	sq_pushfloat(v,*((SQFloat *)&i));
	return 1;
}

static SQInteger _g_blob_castf2i(HSQUIRRELVM v)
{
	SQFloat f;
	sq_getfloat(v,2,&f);
	sq_pushinteger(v,*((SQInteger *)&f));
	return 1;
}

static SQInteger _g_blob_swap2(HSQUIRRELVM v)
{
	SQInteger i;
	sq_getinteger(v,2,&i);
	short s=(short)i;
	sq_pushinteger(v,(s<<8)|((s>>8)&0x00FF));
	return 1;
}

static SQInteger _g_blob_swap4(HSQUIRRELVM v)
{
	SQInteger i;
	sq_getinteger(v,2,&i);
	unsigned int t4 = (unsigned int)i;
	__swap_dword(&t4);
	sq_pushinteger(v,(SQInteger)t4);
	return 1;
}

static SQInteger _g_blob_swapfloat(HSQUIRRELVM v)
{
	SQFloat f;
	sq_getfloat(v,2,&f);
	__swap_dword((unsigned int *)&f);
	sq_pushfloat(v,f);
	return 1;
}

#define _DECL_GLOBALBLOB_FUNC(name,nparams,typecheck) {_SC(#name),_g_blob_##name,nparams,typecheck}
static SQRegFunction bloblib_funcs[]={
	_DECL_GLOBALBLOB_FUNC(casti2f,2,_SC(".n")),
	_DECL_GLOBALBLOB_FUNC(castf2i,2,_SC(".n")),
	_DECL_GLOBALBLOB_FUNC(swap2,2,_SC(".n")),
	_DECL_GLOBALBLOB_FUNC(swap4,2,_SC(".n")),
	_DECL_GLOBALBLOB_FUNC(swapfloat,2,_SC(".n")),
	{0,0}
};

SQRESULT sqstd_getblob(HSQUIRRELVM v,SQInteger idx,SQUserPointer *ptr)
{
	SQBlob *blob;
	if(SQ_FAILED(sq_getinstanceup(v,idx,(SQUserPointer *)&blob,(SQUserPointer)SQSTD_BLOB_TYPE_TAG)))
		return -1;
	*ptr = blob->GetBuf();
	return SQ_OK;
}

SQInteger sqstd_getblobsize(HSQUIRRELVM v,SQInteger idx)
{
	SQBlob *blob;
	if(SQ_FAILED(sq_getinstanceup(v,idx,(SQUserPointer *)&blob,(SQUserPointer)SQSTD_BLOB_TYPE_TAG)))
		return -1;
	return blob->Len();
}

SQUserPointer sqstd_createblob(HSQUIRRELVM v, SQInteger size)
{
	SQInteger top = sq_gettop(v);
	sq_pushregistrytable(v);
	sq_pushstring(v,_SC("std_blob"),-1);
	if(SQ_SUCCEEDED(sq_get(v,-2))) {
		sq_remove(v,-2); //removes the registry
		sq_push(v,1); // push the this
		sq_pushinteger(v,size); //size
		SQBlob *blob = NULL;
		if(SQ_SUCCEEDED(sq_call(v,2,SQTrue,SQFalse))
			&& SQ_SUCCEEDED(sq_getinstanceup(v,-1,(SQUserPointer *)&blob,(SQUserPointer)SQSTD_BLOB_TYPE_TAG))) {
			sq_remove(v,-2);
			sq_remove(v,-2);
			return blob->GetBuf();
		}
	}
	sq_settop(v,top);
	return NULL;
}

SQRESULT sqstd_register_bloblib(HSQUIRRELVM v)
{
	return declare_stream(v,_SC("blob"),(SQUserPointer)SQSTD_BLOB_TYPE_TAG,_SC("std_blob"),_blob_methods,bloblib_funcs);
}