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#include "win32/tip/tip_ui_handler.h"

#include <msctf.h>
#include <wil/com.h>

#include <cstdint>

#include "protocol/commands.pb.h"
#include "win32/tip/tip_input_mode_manager.h"
#include "win32/tip/tip_status.h"
#include "win32/tip/tip_text_service.h"
#include "win32/tip/tip_thread_context.h"
#include "win32/tip/tip_ui_handler_conventional.h"

namespace mozc {
namespace win32 {
namespace tsf {
namespace {

using ::mozc::commands::CompositionMode;

void UpdateLanguageBarOnFocusChange(TipTextService *text_service,
                                    ITfDocumentMgr *document_manager) {
  if (!text_service) {
    return;
  }

  if (!text_service->IsLangbarInitialized()) {
    // If language bar is not initialized, there is nothing to do here.
    return;
  }

  HRESULT result = S_OK;
  ITfThreadMgr *thread_manager = text_service->GetThreadManager();

  if (thread_manager == nullptr) {
    return;
  }

  bool disabled = false;
  {
    if (document_manager == nullptr) {
      // When |document_manager| is null, we should show "disabled" icon
      // as if |ImmAssociateContext(window_handle, nullptr)| was called.
      disabled = true;
    } else {
      wil::com_ptr_nothrow<ITfContext> context;
      result = document_manager->GetTop(&context);
      if (SUCCEEDED(result)) {
        disabled = TipStatus::IsDisabledContext(context.get());
      }
    }
  }

  const TipInputModeManager *input_mode_manager =
      text_service->GetThreadContext()->GetInputModeManager();
  const bool open = input_mode_manager->GetEffectiveOpenClose();
  const CompositionMode mozc_mode =
      open ? static_cast<CompositionMode>(
                 input_mode_manager->GetEffectiveConversionMode())
           : commands::DIRECT;
  text_service->UpdateLangbar(!disabled, static_cast<uint32_t>(mozc_mode));
}

bool UpdateInternal(TipTextService *text_service, ITfContext *context,
                    TfEditCookie read_cookie) {
  return TipUiHandlerConventional::Update(text_service, context, read_cookie);
}

}  // namespace

void TipUiHandler::OnActivate(TipTextService *text_service) {
  TipUiHandlerConventional::OnActivate(text_service);
}

void TipUiHandler::OnDeactivate(TipTextService *text_service) {
  TipUiHandlerConventional::OnDeactivate();
}

void TipUiHandler::OnDocumentMgrChanged(TipTextService *text_service,
                                        ITfDocumentMgr *document_manager) {
  UpdateLanguageBarOnFocusChange(text_service, document_manager);
}

void TipUiHandler::OnFocusChange(TipTextService *text_service,
                                 ITfDocumentMgr *focused_document_manager) {
  TipUiHandlerConventional::OnFocusChange(text_service,
                                          focused_document_manager);
  UpdateLanguageBarOnFocusChange(text_service, focused_document_manager);
}

bool TipUiHandler::Update(TipTextService *text_service, ITfContext *context,
                          TfEditCookie read_cookie) {
  const TipInputModeManager *input_mode_manager =
      text_service->GetThreadContext()->GetInputModeManager();
  const bool open = input_mode_manager->GetEffectiveOpenClose();
  const CompositionMode mozc_mode = static_cast<CompositionMode>(
      input_mode_manager->GetEffectiveConversionMode());
  const bool result = UpdateInternal(text_service, context, read_cookie);
  if (open) {
    text_service->UpdateLangbar(true, mozc_mode);
  } else {
    text_service->UpdateLangbar(true, commands::DIRECT);
  }
  return result;
}

bool TipUiHandler::OnDllProcessAttach(HINSTANCE module_handle,
                                      bool static_loading) {
  TipUiHandlerConventional::OnDllProcessAttach(module_handle, static_loading);
  return true;
}

void TipUiHandler::OnDllProcessDetach(HINSTANCE module_handle,
                                      bool process_shutdown) {
  TipUiHandlerConventional::OnDllProcessDetach(module_handle, process_shutdown);
}

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