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#include "unix/ibus/gtk_candidate_window_handler.h"

#include <unistd.h>

#include "base/logging.h"
#include "protocol/renderer_command.pb.h"
#include "renderer/renderer_interface.h"
#include "renderer/unix/const.h"

namespace mozc {
namespace ibus {

namespace {
const char kDefaultFont[] = "SansSerif 11";
}  // namespace

GtkCandidateWindowHandler::GtkCandidateWindowHandler(
    renderer::RendererInterface *renderer)
    : renderer_(renderer),
      last_update_output_(new commands::Output()),
      use_custom_font_description_(false) {
}

GtkCandidateWindowHandler::~GtkCandidateWindowHandler() {
}

bool GtkCandidateWindowHandler::SendUpdateCommand(
    IBusEngine *engine,
    const commands::Output &output,
    bool visibility) const {
  using commands::RendererCommand;
  RendererCommand command;

  *command.mutable_output() = output;
  command.set_type(RendererCommand::UPDATE);
  command.set_visible(visibility);
  RendererCommand::ApplicationInfo *appinfo
      = command.mutable_application_info();

  auto *preedit_rectangle = command.mutable_preedit_rectangle();
  const auto &cursor_area = engine->cursor_area;
  preedit_rectangle->set_left(cursor_area.x);
  preedit_rectangle->set_top(cursor_area.y);
  preedit_rectangle->set_right(cursor_area.x + cursor_area.width);
  preedit_rectangle->set_bottom(cursor_area.y + cursor_area.height);

  // Set pid
  static_assert(sizeof(::getpid()) <= sizeof(appinfo->process_id()),
                "|appinfo->process_id()| must have sufficient room.");
  appinfo->set_process_id(::getpid());

  // Do not set thread_id returned from ::pthread_self() because:
  // 1. the returned value is valid only in the caller process.
  // 2. the returned value may exceed uint32.
  // TODO(team): Consider to use ::gettid()

  // Set InputFramework type
  appinfo->set_input_framework(RendererCommand::ApplicationInfo::IBus);
  appinfo->set_pango_font_description(GetFontDescription());

  return renderer_->ExecCommand(command);
}

void GtkCandidateWindowHandler::Update(IBusEngine *engine,
                                       const commands::Output &output) {
  *last_update_output_ = output;

  UpdateCursorRect(engine);
}

void GtkCandidateWindowHandler::UpdateCursorRect(IBusEngine *engine) {
  const bool has_candidates =
      last_update_output_->has_candidates() &&
      last_update_output_->candidates().candidate_size() > 0;
  SendUpdateCommand(engine, *last_update_output_, has_candidates);
}

void GtkCandidateWindowHandler::Hide(IBusEngine *engine) {
  SendUpdateCommand(engine, *last_update_output_, false);
}

void GtkCandidateWindowHandler::Show(IBusEngine *engine) {
  SendUpdateCommand(engine, *last_update_output_, true);
}

void GtkCandidateWindowHandler::OnIBusCustomFontDescriptionChanged(
    const string &custom_font_description) {
  custom_font_description_.assign(custom_font_description);
}

void GtkCandidateWindowHandler::OnIBusUseCustomFontDescriptionChanged(
    bool use_custom_font_description) {
  use_custom_font_description_ = use_custom_font_description;
}

string GtkCandidateWindowHandler::GetFontDescription() const {
  if (!use_custom_font_description_) {
    // TODO(nona): Load application default font settings.
    return kDefaultFont;
  }
  DCHECK(!custom_font_description_.empty());
  return custom_font_description_;
}

}  // namespace ibus
}  // namespace mozc
