/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-

 *

 * 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 "nsDragServiceProxy.h"

#include "nsIDocument.h"

#include "nsISupportsPrimitives.h"

#include "mozilla/dom/TabChild.h"

#include "mozilla/gfx/2D.h"

#include "mozilla/UniquePtr.h"

#include "mozilla/Unused.h"

#include "nsContentUtils.h"

using mozilla::LayoutDeviceIntRect;

using mozilla::Maybe;

using mozilla::dom::OptionalShmem;

using mozilla::dom::TabChild;

using mozilla::ipc::Shmem;

nsDragServiceProxy::nsDragServiceProxy() {}

nsDragServiceProxy::~nsDragServiceProxy() {}

static void GetPrincipalURIFromNode(nsCOMPtr<nsIDOMNode>& sourceNode,

                                    nsCString& aPrincipalURISpec) {

  nsCOMPtr<nsINode> node = do_QueryInterface(sourceNode);

  if (!node) {

    return;

  }

  nsCOMPtr<nsIPrincipal> principal = node->NodePrincipal();

  nsCOMPtr<nsIURI> principalURI;

  nsresult rv = principal->GetURI(getter_AddRefs(principalURI));

  if (NS_FAILED(rv) || !principalURI) {

    return;

  }

  principalURI->GetSpec(aPrincipalURISpec);

}

nsresult nsDragServiceProxy::InvokeDragSessionImpl(

    nsIArray* aArrayTransferables, nsIScriptableRegion* aRegion,

    uint32_t aActionType) {

  nsCOMPtr<nsIDocument> doc = do_QueryInterface(mSourceDocument);

  NS_ENSURE_STATE(doc->GetDocShell());

  TabChild* child = TabChild::GetFrom(doc->GetDocShell());

  NS_ENSURE_STATE(child);

  nsTArray<mozilla::dom::IPCDataTransfer> dataTransfers;

  nsContentUtils::TransferablesToIPCTransferables(

      aArrayTransferables, dataTransfers, false, child->Manager(), nullptr);

  nsCString principalURISpec;

  GetPrincipalURIFromNode(mSourceNode, principalURISpec);

  LayoutDeviceIntRect dragRect;

  if (mHasImage || mSelection) {

    nsPresContext* pc;

    RefPtr<mozilla::gfx::SourceSurface> surface;

    DrawDrag(mSourceNode, aRegion, mScreenPosition, &dragRect, &surface, &pc);

    if (surface) {

      RefPtr<mozilla::gfx::DataSourceSurface> dataSurface =

          surface->GetDataSurface();

      if (dataSurface) {

        size_t length;

        int32_t stride;

        Maybe<Shmem> maybeShm = nsContentUtils::GetSurfaceData(

            dataSurface, &length, &stride, child);

        if (maybeShm.isNothing()) {

          return NS_ERROR_FAILURE;

        }

        auto surfaceData = maybeShm.value();

        // Save the surface data to shared memory.

        if (!surfaceData.IsReadable() || !surfaceData.get<char>()) {

          NS_WARNING("Failed to create shared memory for drag session.");

          return NS_ERROR_FAILURE;

        }

        mozilla::Unused << child->SendInvokeDragSession(

            dataTransfers, aActionType, surfaceData, stride,

            static_cast<uint8_t>(dataSurface->GetFormat()), dragRect,

            principalURISpec);

        StartDragSession();

        return NS_OK;

      }

    }

  }

  mozilla::Unused << child->SendInvokeDragSession(dataTransfers, aActionType,

                                                  mozilla::void_t(), 0, 0,

                                                  dragRect, principalURISpec);

  StartDragSession();

  return NS_OK;

}