/* -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil; tab-width: 8 -*- */

/* 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 "mozilla/plugins/BrowserStreamChild.h"

#include "mozilla/Attributes.h"

#include "mozilla/plugins/PluginInstanceChild.h"

#include "mozilla/plugins/StreamNotifyChild.h"

namespace mozilla {

namespace plugins {

BrowserStreamChild::BrowserStreamChild(PluginInstanceChild* instance,

                                       const nsCString& url,

                                       const uint32_t& length,

                                       const uint32_t& lastmodified,

                                       StreamNotifyChild* notifyData,

                                       const nsCString& headers)

  : mInstance(instance)

  , mStreamStatus(kStreamOpen)

  , mDestroyPending(NOT_DESTROYED)

  , mNotifyPending(false)

  , mInstanceDying(false)

  , mState(CONSTRUCTING)

  , mURL(url)

  , mHeaders(headers)

  , mStreamNotify(notifyData)

  , mDeliveryTracker(this)

{

  PLUGIN_LOG_DEBUG(("%s (%s, %i, %i, %p, %s)", FULLFUNCTION,

                    url.get(), length, lastmodified, (void*) notifyData,

                    headers.get()));

  AssertPluginThread();

  memset(&mStream, 0, sizeof(mStream));

  mStream.ndata = static_cast<AStream*>(this);

  mStream.url = NullableStringGet(mURL);

  mStream.end = length;

  mStream.lastmodified = lastmodified;

  mStream.headers = NullableStringGet(mHeaders);

  if (notifyData) {

    mStream.notifyData = notifyData->mClosure;

    notifyData->SetAssociatedStream(this);

  }

}

NPError

BrowserStreamChild::StreamConstructed(

            const nsCString& mimeType,

            const bool& seekable,

            uint16_t* stype)

{

  NPError rv = NPERR_NO_ERROR;

  *stype = NP_NORMAL;

  rv = mInstance->mPluginIface->newstream(

    &mInstance->mData, const_cast<char*>(NullableStringGet(mimeType)),

    &mStream, seekable, stype);

  // NP_NORMAL is the only permissible stream type

  if (*stype != NP_NORMAL) {

    rv = NPERR_INVALID_PARAM;

    // The plugin thinks the stream is alive, so we kill it explicitly

    (void) mInstance->mPluginIface

      ->destroystream(&mInstance->mData, &mStream, NPRES_NETWORK_ERR);

  }

  if (rv != NPERR_NO_ERROR) {

    mState = DELETING;

    if (mStreamNotify) {

      mStreamNotify->SetAssociatedStream(nullptr);

      mStreamNotify = nullptr;

    }

  }

  else {

    mState = ALIVE;

  }

  return rv;

}

BrowserStreamChild::~BrowserStreamChild()

{

  NS_ASSERTION(!mStreamNotify, "Should have nulled it by now!");

}

mozilla::ipc::IPCResult

BrowserStreamChild::RecvWrite(const int32_t& offset,

                              const uint32_t& newlength,

                              const Buffer& data)

{

  PLUGIN_LOG_DEBUG_FUNCTION;

  AssertPluginThread();

  if (ALIVE != mState)

    MOZ_CRASH("Unexpected state: received data after NPP_DestroyStream?");

  if (kStreamOpen != mStreamStatus)

    return IPC_OK();

  mStream.end = newlength;

  NS_ASSERTION(data.Length() > 0, "Empty data");

  PendingData* newdata = mPendingData.AppendElement();

  newdata->offset = offset;

  newdata->data = data;

  newdata->curpos = 0;

  EnsureDeliveryPending();

  return IPC_OK();

}

mozilla::ipc::IPCResult

BrowserStreamChild::RecvNPP_DestroyStream(const NPReason& reason)

{

  PLUGIN_LOG_DEBUG_METHOD;

  if (ALIVE != mState)

    MOZ_CRASH("Unexpected state: recevied NPP_DestroyStream twice?");

  mState = DYING;

  mDestroyPending = DESTROY_PENDING;

  if (NPRES_DONE != reason)

    mStreamStatus = reason;

  EnsureDeliveryPending();

  return IPC_OK();

}

mozilla::ipc::IPCResult

BrowserStreamChild::Recv__delete__()

{

  AssertPluginThread();

  if (DELETING != mState)

    MOZ_CRASH("Bad state, not DELETING");

  return IPC_OK();

}

void

BrowserStreamChild::EnsureDeliveryPending()

{

  MessageLoop::current()->PostTask(

    mDeliveryTracker.NewRunnableMethod(&BrowserStreamChild::Deliver));

}

void

BrowserStreamChild::Deliver()

{

  while (kStreamOpen == mStreamStatus && mPendingData.Length()) {

    if (DeliverPendingData() && kStreamOpen == mStreamStatus) {

      SetSuspendedTimer();

      return;

    }

  }

  ClearSuspendedTimer();

  NS_ASSERTION(kStreamOpen != mStreamStatus || 0 == mPendingData.Length(),

               "Exit out of the data-delivery loop with pending data");

  mPendingData.Clear();

  if (DESTROY_PENDING == mDestroyPending) {

    mDestroyPending = DESTROYED;

    if (mState != DYING)

      MOZ_CRASH("mDestroyPending but state not DYING");

    NS_ASSERTION(NPRES_DONE != mStreamStatus, "Success status set too early!");

    if (kStreamOpen == mStreamStatus)

      mStreamStatus = NPRES_DONE;

    (void) mInstance->mPluginIface

      ->destroystream(&mInstance->mData, &mStream, mStreamStatus);

  }

  if (DESTROYED == mDestroyPending && mNotifyPending) {

    NS_ASSERTION(mStreamNotify, "mDestroyPending but no mStreamNotify?");

    mNotifyPending = false;

    mStreamNotify->NPP_URLNotify(mStreamStatus);

    delete mStreamNotify;

    mStreamNotify = nullptr;

  }

  if (DYING == mState && DESTROYED == mDestroyPending

      && !mStreamNotify && !mInstanceDying) {

    SendStreamDestroyed();

    mState = DELETING;

  }

}

bool

BrowserStreamChild::DeliverPendingData()

{

  if (mState != ALIVE && mState != DYING)

    MOZ_CRASH("Unexpected state");

  NS_ASSERTION(mPendingData.Length(), "Called from Deliver with empty pending");

  while (mPendingData[0].curpos < static_cast<int32_t>(mPendingData[0].data.Length())) {

    int32_t r = mInstance->mPluginIface->writeready(&mInstance->mData, &mStream);

    if (kStreamOpen != mStreamStatus)

      return false;

    if (0 == r) // plugin wants to suspend delivery

      return true;

    r = mInstance->mPluginIface->write(

      &mInstance->mData, &mStream,

      mPendingData[0].offset + mPendingData[0].curpos, // offset

      mPendingData[0].data.Length() - mPendingData[0].curpos, // length

      const_cast<char*>(mPendingData[0].data.BeginReading() + mPendingData[0].curpos));

    if (kStreamOpen != mStreamStatus)

      return false;

    if (0 == r)

      return true;

    if (r < 0) { // error condition

      mStreamStatus = NPRES_NETWORK_ERR;

      // Set up stream destruction

      EnsureDeliveryPending();

      return false;

    }

    mPendingData[0].curpos += r;

  }

  mPendingData.RemoveElementAt(0);

  return false;

}

void

BrowserStreamChild::SetSuspendedTimer()

{

  if (mSuspendedTimer.IsRunning())

    return;

  mSuspendedTimer.Start(

    base::TimeDelta::FromMilliseconds(100), // 100ms copied from Mozilla plugin host

    this, &BrowserStreamChild::Deliver);

}

void

BrowserStreamChild::ClearSuspendedTimer()

{

  mSuspendedTimer.Stop();

}

} /* namespace plugins */

} /* namespace mozilla */