/*

 * Copyright (c) 2016-2021  Moddable Tech, Inc.

 *

 *   This file is part of the Moddable SDK Runtime.

 * 

 *   The Moddable SDK Runtime is free software: you can redistribute it and/or modify

 *   it under the terms of the GNU Lesser General Public License as published by

 *   the Free Software Foundation, either version 3 of the License, or

 *   (at your option) any later version.

 * 

 *   The Moddable SDK Runtime is distributed in the hope that it will be useful,

 *   but WITHOUT ANY WARRANTY; without even the implied warranty of

 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 *   GNU Lesser General Public License for more details.

 * 

 *   You should have received a copy of the GNU Lesser General Public License

 *   along with the Moddable SDK Runtime.  If not, see <http://www.gnu.org/licenses/>.

 *

 * This file incorporates work covered by the following copyright and  

 * permission notice:  

 *

 *       Copyright (C) 2010-2016 Marvell International Ltd.

 *       Copyright (C) 2002-2010 Kinoma, Inc.

 *

 *       Licensed under the Apache License, Version 2.0 (the "License");

 *       you may not use this file except in compliance with the License.

 *       You may obtain a copy of the License at

 *

 *        http://www.apache.org/licenses/LICENSE-2.0

 *

 *       Unless required by applicable law or agreed to in writing, software

 *       distributed under the License is distributed on an "AS IS" BASIS,

 *       WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 *       See the License for the specific language governing permissions and

 *       limitations under the License.

 */

#include "xsAll.h"

#include <stdio.h>

#ifndef ICACHE_XS6STRING_ATTR

  #define ICACHE_XS6STRING_ATTR

#endif

#define fxPop() (*(the->stack++))

#define fxPush(_SLOT) (*(--the->stack) = (_SLOT))

void _xsNewArray(txMachine *the, txSlot *res, txInteger length)

{

  fxNewArray(the, length);

  *res = fxPop();

}

void _xsNewObject(txMachine *the, txSlot *res)

{

  fxNewObject(the);

  *res = fxPop();

}

void _xsNewHostInstance(txMachine *the, txSlot *res, txSlot *proto)

{

  mxOverflow(-1);

  fxPush(*proto);

  fxNewHostInstance(the);

  *res = fxPop();

}

txBoolean _xsIsInstanceOf(txMachine *the, txSlot *v, txSlot *proto)

{

  mxOverflow(-2);

  fxPush(*proto);

  fxPush(*v);

  return fxIsInstanceOf(the);

}

txBoolean _xsHas(txMachine *the, txSlot *self, txID id)

{

  mxOverflow(-1);

  fxPush(*self);

  return mxHasID(id);

}

txBoolean _xsHasIndex(txMachine *the, txSlot *self, txIndex index)

{

  mxOverflow(-1);

  fxPush(*self);

  return fxHasIndex(the, index);

}

void _xsGet(txMachine *the, txSlot *res, txSlot *self, txID id)

{

  mxOverflow(-1);

  fxPush(*self);

  mxGetID(id);

  *res = fxPop();

}

void _xsGetAt(txMachine *the, txSlot *res, txSlot *self, txSlot *at)

{

  mxOverflow(-2);

  fxPush(*self);

  fxPush(*at);

  fxGetAt(the);

  *res = fxPop();

}

void _xsGetIndex(txMachine *the, txSlot *res, txSlot *self, txIndex index)

{

  mxOverflow(-1);

  fxPush(*self);

  mxGetIndex(index);

  *res = fxPop();

}

void _xsSet(txMachine *the, txSlot *self, txID id, txSlot *v)

{

  mxOverflow(-2);

  fxPush(*v);

  fxPush(*self);

  mxSetID(id);

  mxPop();

}

void _xsSetAt(txMachine *the, txSlot *self, txSlot *at , txSlot *v)

{

  mxOverflow(-3);

  fxPush(*v);

  fxPush(*self);

  fxPush(*at);

  fxSetAt(the);

  mxPop();

}

void _xsSetIndex(txMachine *the, txSlot *self, txIndex index, txSlot *v)

{

  mxOverflow(-2);

  fxPush(*v);

  fxPush(*self);

  mxSetIndex(index);

  mxPop();

}

void _xsDefine(txMachine *the, txSlot *self, txID id, txSlot *v, txFlag attributes)

{

  mxOverflow(-2);

  fxPush(*v);

  fxPush(*self);

  fxDefineID(the, id, attributes, attributes | XS_DONT_DELETE_FLAG | XS_DONT_ENUM_FLAG | XS_DONT_SET_FLAG);

  mxPop();

}

void _xsDelete(txMachine *the, txSlot *self, txID id)

{

  mxOverflow(-1);

  fxPush(*self);

  mxDeleteID(id);

}

void _xsDeleteAt(txMachine *the, txSlot *self, txSlot *at)

{

  mxOverflow(-2);

  fxPush(*self);

  fxPush(*at);

  fxDeleteAt(the);

}

void _xsCall(txMachine *the, txSlot *res, txSlot *self, txUnsigned id, ...)

{

  va_list ap;

  int n;

  txSlot *v;

  va_start(ap, id);

  for (n = 0; va_arg(ap, txSlot *) != NULL; n++)

    ;

  va_end(ap);

  mxOverflow(-(n+6));

  fxPush(*self);

  fxCallID(the, (txID)id);

  va_start(ap, id);

  while ((v = va_arg(ap, txSlot *)) != NULL)

    fxPush(*v);

  va_end(ap);

  fxRunCount(the, n);

  if (res != NULL)

    *res = fxPop();

  else

    mxPop();

}

void _xsNew(txMachine *the, txSlot *res, txSlot *self, txUnsigned id, ...)

{

  va_list ap;

  int n;

  txSlot *v;

  va_start(ap, id);

  for (n = 0; va_arg(ap, txSlot *) != NULL; n++)

    ;

  va_end(ap);

  mxOverflow(-(n+6));

  fxPush(*self);

  fxNewID(the, (txID)id);

  va_start(ap, id);

  while ((v = va_arg(ap, txSlot *)) != NULL)

    fxPush(*v);

  va_end(ap);

  fxRunCount(the, n);

  *res = fxPop();

}

txBoolean _xsTest(txMachine *the, txSlot *v)

{

  mxOverflow(-1);

  fxPush(*v);

  return fxRunTest(the);

}

txInteger fxIncrementalVars(txMachine* the, txInteger theCount)

{

  txSlot* aStack = the->scope;

  txInteger aVar;

  if (aStack - aStack->value.integer != the->stack) {

    static const char msg[] ICACHE_XS6STRING_ATTR = "C: xsVars: too late";

    mxSyntaxError((char *)msg);

  }

  mxOverflow(theCount);

  aVar = aStack->value.integer;

  aStack->value.integer += theCount;

  if (theCount > 0) {

    while (theCount) {

      mxPushUndefined();

      theCount--;

    }

  }

  else

    the->stack -= theCount;

  return aVar;

}

txInteger _xsArgc(txMachine *the)

{

  return mxArgc;

}

#ifndef __XSMC_H__

enum {

  xsBufferNonrelocatable,

  xsBufferRelocatable

};

#endif

static txInteger _xsmcGetViewBuffer(txMachine *the, txSlot* view, txSlot* buffer, void **data, txUnsigned *count, txBoolean writable)

{

  txInteger offset = view->value.dataView.offset;

  txInteger size = view->value.dataView.size;

  txSlot* arrayBuffer = buffer->value.reference->next;

  txSlot* bufferInfo = arrayBuffer->next;

  if (arrayBuffer->value.arrayBuffer.address == C_NULL)

    mxTypeError("detached buffer");

  if (writable && (arrayBuffer->flag & XS_DONT_SET_FLAG))

    mxTypeError("read-only buffer");

  if (bufferInfo->value.bufferInfo.maxLength >= 0) {

    txInteger byteLength = bufferInfo->value.bufferInfo.length;

    if (offset > byteLength)

      mxTypeError("out of bounds view");

    if (size < 0)

      size = byteLength - offset;

    else if (offset + size > byteLength)

      mxTypeError("out of bounds view");

  }

  *data = arrayBuffer->value.arrayBuffer.address + offset;

  *count = size;

  return (XS_ARRAY_BUFFER_KIND == arrayBuffer->kind) ? xsBufferRelocatable : xsBufferNonrelocatable;

}

txInteger _xsmcGetBuffer(txMachine *the, txSlot *slot, void **data, txUnsigned *count, txBoolean writable)

{

  txSlot* instance;

  if (slot->kind != XS_REFERENCE_KIND)

    goto bail;

  instance = slot->value.reference;

  if (!(((slot = instance->next)) && (slot->flag & XS_INTERNAL_FLAG)))

    goto bail;

  if (slot->kind == XS_ARRAY_BUFFER_KIND) {

    txSlot* bufferInfo = slot->next;

    if (slot->value.arrayBuffer.address == C_NULL)

      mxTypeError("detached buffer");

    if (writable && (slot->flag & XS_DONT_SET_FLAG))

      mxTypeError("read-only buffer");

    *data = slot->value.arrayBuffer.address;

    *count = bufferInfo->value.bufferInfo.length;

    return xsBufferRelocatable;

  }

  if (slot->kind == XS_TYPED_ARRAY_KIND) {

    txSlot* view = slot->next;

    txSlot* buffer = view->next;

    if (1 != slot->value.typedArray.dispatch->size)

      goto bail;

    return _xsmcGetViewBuffer(the, view, buffer, data, count, writable);

  }

  if (slot->kind == XS_HOST_KIND) {

    txSlot* bufferInfo = slot->next;

    if (slot->flag & XS_HOST_CHUNK_FLAG)

      goto bail;

    if (writable && (slot->flag & XS_DONT_SET_FLAG))

      mxTypeError("read-only buffer");

    if (bufferInfo && (bufferInfo->kind == XS_BUFFER_INFO_KIND)) {

      *data = (uint8_t *)slot->value.host.data;

      *count = bufferInfo->value.bufferInfo.length;

    }

    else {

      // for compatibility. should throw eventually.

      txSlot tmp, ref;

      fxReport(the, "# Use xsmcSetHostBuffer instead of xsmcSetHostData\n");

      fxReference(the, &ref, instance);

      _xsGet(the, &tmp, &ref, _byteLength);

      *data = (uint8_t *)slot->value.host.data;

      *count = (txUnsigned)fxToInteger(the, &tmp);

    }

    return xsBufferNonrelocatable;

  }

  if (slot->kind == XS_DATA_VIEW_KIND) {

    txSlot* view = slot;

    txSlot* buffer = view->next;

    return _xsmcGetViewBuffer(the, view, buffer, data, count, writable);

  }

bail:

  mxTypeError("invalid buffer");

  return xsBufferNonrelocatable;

}