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#include "win32/tip/tip_composition_util.h"

#include "win32/base/tsf_profile.h"
#include "win32/tip/tip_edit_session_impl.h"
#include "win32/tip/tip_range_util.h"
#include "win32/tip/tip_text_service.h"

namespace mozc {
namespace win32 {
namespace tsf {

using ATL::CComPtr;

CComPtr<ITfCompositionView> TipCompositionUtil::GetComposition(
    CComPtr<ITfContext> context, TfEditCookie edit_cookie) {
  CComPtr<ITfContextComposition> context_composition;
  if (FAILED(context.QueryInterface(&context_composition))) {
    return nullptr;
  }

  CComPtr<IEnumITfCompositionView> enum_composition;
  if (FAILED(context_composition->FindComposition(edit_cookie, nullptr,
                                                  &enum_composition))) {
    return nullptr;
  }

  while (true) {
    CComPtr<ITfCompositionView> composition_view;
    ULONG num_fetched = 0;
    if (enum_composition->Next(1, &composition_view, &num_fetched) != S_OK) {
      return nullptr;
    }
    if (num_fetched != 1) {
      return nullptr;
    }
    GUID clsid = GUID_NULL;
    if (FAILED(composition_view->GetOwnerClsid(&clsid))) {
      continue;
    }
    if (!::IsEqualCLSID(TsfProfile::GetTextServiceGuid(), clsid)) {
      continue;
    }
    // Although TSF supports multiple composition, Mozc uses only one
    // composition at the same time. So the first one must be the only one.
    return composition_view;
  }
}

HRESULT TipCompositionUtil::ClearDisplayAttributes(ITfContext *context,
                                                   ITfComposition *composition,
                                                   TfEditCookie write_cookie) {
  HRESULT result = S_OK;

  // Retrieve the current composition range.
  CComPtr<ITfRange> composition_range;
  result = composition->GetRange(&composition_range);
  if (FAILED(result)) {
    return result;
  }

  // Get out the display attribute property
  CComPtr<ITfProperty> display_attribute;
  result = context->GetProperty(GUID_PROP_ATTRIBUTE, &display_attribute);
  if (FAILED(result)) {
    return result;
  }
  // Clear existing attributes.
  result = display_attribute->Clear(write_cookie, composition_range);
  if (FAILED(result)) {
    return result;
  }
  return S_OK;
}

}  // namespace tsf
}  // namespace win32
}  // namespace mozc