/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this file,
 * You can obtain one at http://mozilla.org/MPL/2.0/. */

#include <algorithm>
#include "TCPSocketChild.h"
#include "mozilla/Unused.h"
#include "mozilla/UniquePtr.h"
#include "mozilla/net/NeckoChild.h"
#include "mozilla/dom/PBrowserChild.h"
#include "mozilla/dom/TabChild.h"
#include "nsITCPSocketCallback.h"
#include "TCPSocket.h"
#include "nsContentUtils.h"
#include "jsapi.h"
#include "jsfriendapi.h"

using mozilla::net::gNeckoChild;

namespace IPC {

bool
DeserializeArrayBuffer(JSContext* cx,
                       const InfallibleTArray<uint8_t>& aBuffer,
                       JS::MutableHandle<JS::Value> aVal)
{
  mozilla::UniquePtr<uint8_t[], JS::FreePolicy> data(js_pod_malloc<uint8_t>(aBuffer.Length()));
  if (!data)
      return false;
  memcpy(data.get(), aBuffer.Elements(), aBuffer.Length());

  JSObject* obj = JS_NewArrayBufferWithContents(cx, aBuffer.Length(), data.get());
  if (!obj)
      return false;
  // If JS_NewArrayBufferWithContents returns non-null, the ownership of
  // the data is transfered to obj, so we release the ownership here.
  mozilla::Unused << data.release();

  aVal.setObject(*obj);
  return true;
}

} // namespace IPC

namespace mozilla {
namespace dom {

NS_IMPL_CYCLE_COLLECTION_CLASS(TCPSocketChildBase)

NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(TCPSocketChildBase)
  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mSocket)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END

NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(TCPSocketChildBase)
  NS_IMPL_CYCLE_COLLECTION_UNLINK(mSocket)
NS_IMPL_CYCLE_COLLECTION_UNLINK_END

NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(TCPSocketChildBase)
NS_IMPL_CYCLE_COLLECTION_TRACE_END

NS_IMPL_CYCLE_COLLECTING_ADDREF(TCPSocketChildBase)
NS_IMPL_CYCLE_COLLECTING_RELEASE(TCPSocketChildBase)

NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(TCPSocketChildBase)
  NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END

TCPSocketChildBase::TCPSocketChildBase()
: mIPCOpen(false)
{
  mozilla::HoldJSObjects(this);
}

TCPSocketChildBase::~TCPSocketChildBase()
{
  mozilla::DropJSObjects(this);
}

NS_IMETHODIMP_(MozExternalRefCountType) TCPSocketChild::Release(void)
{
  nsrefcnt refcnt = TCPSocketChildBase::Release();
  if (refcnt == 1 && mIPCOpen) {
    PTCPSocketChild::SendRequestDelete();
    return 1;
  }
  return refcnt;
}

TCPSocketChild::TCPSocketChild(const nsAString& aHost,
                               const uint16_t& aPort,
                               nsIEventTarget* aTarget)
: mHost(aHost)
, mPort(aPort)
, mIPCEventTarget(aTarget)
{
}

void
TCPSocketChild::SendOpen(nsITCPSocketCallback* aSocket, bool aUseSSL, bool aUseArrayBuffers)
{
  mSocket = aSocket;

  if (mIPCEventTarget) {
    gNeckoChild->SetEventTargetForActor(this, mIPCEventTarget);
  }

  AddIPDLReference();
  gNeckoChild->SendPTCPSocketConstructor(this, mHost, mPort);
  MOZ_ASSERT(mFilterName.IsEmpty()); // Currently nobody should use this
  PTCPSocketChild::SendOpen(mHost, mPort, aUseSSL, aUseArrayBuffers);
}

void
TCPSocketChild::SendWindowlessOpenBind(nsITCPSocketCallback* aSocket,
                                       const nsACString& aRemoteHost, uint16_t aRemotePort,
                                       const nsACString& aLocalHost, uint16_t aLocalPort,
                                       bool aUseSSL, bool aReuseAddrPort)
{
  mSocket = aSocket;

  if (mIPCEventTarget) {
    gNeckoChild->SetEventTargetForActor(this, mIPCEventTarget);
  }

  AddIPDLReference();
  gNeckoChild->SendPTCPSocketConstructor(this,
                                         NS_ConvertUTF8toUTF16(aRemoteHost),
                                         aRemotePort);
  PTCPSocketChild::SendOpenBind(nsCString(aRemoteHost), aRemotePort,
                                nsCString(aLocalHost), aLocalPort,
                                aUseSSL, aReuseAddrPort,
                                true, mFilterName);
}

void
TCPSocketChildBase::ReleaseIPDLReference()
{
  MOZ_ASSERT(mIPCOpen);
  mIPCOpen = false;
  mSocket = nullptr;
  this->Release();
}

void
TCPSocketChildBase::AddIPDLReference()
{
  MOZ_ASSERT(!mIPCOpen);
  mIPCOpen = true;
  this->AddRef();
}

TCPSocketChild::~TCPSocketChild()
{
}

mozilla::ipc::IPCResult
TCPSocketChild::RecvUpdateBufferedAmount(const uint32_t& aBuffered,
                                         const uint32_t& aTrackingNumber)
{
  mSocket->UpdateBufferedAmount(aBuffered, aTrackingNumber);
  return IPC_OK();
}

mozilla::ipc::IPCResult
TCPSocketChild::RecvCallback(const nsString& aType,
                             const CallbackData& aData,
                             const uint32_t& aReadyState)
{
  mSocket->UpdateReadyState(aReadyState);

  if (aData.type() == CallbackData::Tvoid_t) {
    mSocket->FireEvent(aType);

  } else if (aData.type() == CallbackData::TTCPError) {
    const TCPError& err(aData.get_TCPError());
    mSocket->FireErrorEvent(err.name(), err.message());

  } else if (aData.type() == CallbackData::TSendableData) {
    const SendableData& data = aData.get_SendableData();

    if (data.type() == SendableData::TArrayOfuint8_t) {
      mSocket->FireDataArrayEvent(aType, data.get_ArrayOfuint8_t());
    } else if (data.type() == SendableData::TnsCString) {
      mSocket->FireDataStringEvent(aType, data.get_nsCString());
    } else {
      MOZ_CRASH("Invalid callback data type!");
    }
  } else {
    MOZ_CRASH("Invalid callback type!");
  }
  return IPC_OK();
}

void
TCPSocketChild::SendSend(const nsACString& aData, uint32_t aTrackingNumber)
{
  SendData(nsCString(aData), aTrackingNumber);
}

nsresult
TCPSocketChild::SendSend(const ArrayBuffer& aData,
                         uint32_t aByteOffset,
                         uint32_t aByteLength,
                         uint32_t aTrackingNumber)
{
  uint32_t buflen = aData.Length();
  uint32_t offset = std::min(buflen, aByteOffset);
  uint32_t nbytes = std::min(buflen - aByteOffset, aByteLength);
  FallibleTArray<uint8_t> fallibleArr;
  if (!fallibleArr.InsertElementsAt(0, aData.Data() + offset, nbytes, fallible)) {
    return NS_ERROR_OUT_OF_MEMORY;
  }

  InfallibleTArray<uint8_t> arr;
  arr.SwapElements(fallibleArr);
  SendData(arr, aTrackingNumber);
  return NS_OK;
}

NS_IMETHODIMP
TCPSocketChild::SendSendArray(nsTArray<uint8_t>& aArray, uint32_t aTrackingNumber)
{
  SendData(aArray, aTrackingNumber);
  return NS_OK;
}

void
TCPSocketChild::SetSocket(TCPSocket* aSocket)
{
  mSocket = aSocket;
}

void
TCPSocketChild::GetHost(nsAString& aHost)
{
  aHost = mHost;
}

void
TCPSocketChild::GetPort(uint16_t* aPort)
{
  *aPort = mPort;
}

nsresult
TCPSocketChild::SetFilterName(const nsACString& aFilterName)
{
  if (!mFilterName.IsEmpty()) {
    // filter name can only be set once.
    return NS_ERROR_FAILURE;
  }
  mFilterName = aFilterName;
  return NS_OK;
}

mozilla::ipc::IPCResult
TCPSocketChild::RecvRequestDelete()
{
  mozilla::Unused << Send__delete__(this);
  return IPC_OK();
}

} // namespace dom
} // namespace mozilla
