// Copyright 2010-2014, Google Inc.
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//
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//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
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// in the documentation and/or other materials provided with the
// distribution.
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#include <cstdio>

#include "base/flags.h"
#include "base/logging.h"
#include "base/version.h"
#include "unix/ibus/main.h"
#include "unix/ibus/mozc_engine.h"
#include "unix/ibus/path_util.h"

DEFINE_bool(ibus, false, "The engine is started by ibus-daemon");

namespace {

IBusBus *g_bus = NULL;
IBusConfig *g_config = NULL;

#ifndef NO_LOGGING
void EnableVerboseLog() {
  const int kDefaultVerboseLevel = 1;
  if (mozc::Logging::GetVerboseLevel() < kDefaultVerboseLevel) {
    mozc::Logging::SetVerboseLevel(kDefaultVerboseLevel);
  }
}
#endif  // NO_LOGGING

void IgnoreSigChild() {
  // Don't wait() child process termination.
  struct sigaction sa;
  sa.sa_handler = SIG_IGN;
  ::sigemptyset(&sa.sa_mask);
  sa.sa_flags = 0;
  CHECK_EQ(0, ::sigaction(SIGCHLD, &sa, NULL));
  // TODO(taku): move this function inside client::Session::LaunchTool
}

// Creates a IBusComponent object and add engine(s) to the object.
IBusComponent *GetIBusComponent() {
  IBusComponent *component = ibus_component_new(
      kComponentName,
      kComponentDescription,
      mozc::Version::GetMozcVersion().c_str(),
      kComponentLicense,
      kComponentAuthor,
      kComponentHomepage,
      "",
      kComponentTextdomain);
  const string icon_path = mozc::ibus::GetIconPath(kEngineIcon);
  for (size_t i = 0; i < kEngineArrayLen; ++i) {
    ibus_component_add_engine(component,
                              ibus_engine_desc_new(kEngineNameArray[i],
                                                   kEngineLongnameArray[i],
                                                   kEngineDescription,
                                                   kEngineLanguage,
                                                   kComponentLicense,
                                                   kComponentAuthor,
                                                   icon_path.c_str(),
                                                   kEngineLayoutArray[i]));
  }
  return component;
}

// Initializes ibus components and adds Mozc engine.
void InitIBusComponent(bool executed_by_ibus_daemon) {
  g_bus = ibus_bus_new();
  g_signal_connect(g_bus,
                   "disconnected",
                   G_CALLBACK(mozc::ibus::MozcEngine::Disconnected),
                   NULL);
  g_config = ibus_bus_get_config(g_bus);
  g_object_ref_sink(g_config);
  g_signal_connect(g_config,
                   "value-changed",
                   G_CALLBACK(mozc::ibus::MozcEngine::ConfigValueChanged),
                   NULL);

  IBusComponent *component = GetIBusComponent();
  IBusFactory *factory = ibus_factory_new(ibus_bus_get_connection(g_bus));
  GList *engines = ibus_component_get_engines(component);
  for (GList *p = engines; p; p = p->next) {
    IBusEngineDesc *engine = reinterpret_cast<IBusEngineDesc*>(p->data);
    const gchar * const engine_name = ibus_engine_desc_get_name(engine);
    ibus_factory_add_engine(
        factory, engine_name, mozc::ibus::MozcEngine::GetType());
  }

  if (executed_by_ibus_daemon) {
    ibus_bus_request_name(g_bus, kComponentName, 0);
  } else {
    ibus_bus_register_component(g_bus, component);
  }
  g_object_unref(component);
}

}  // namespace

int main(gint argc, gchar **argv) {
  InitGoogle(argv[0], &argc, &argv, true);
  ibus_init();
  InitIBusComponent(FLAGS_ibus);
  mozc::ibus::MozcEngine::InitConfig(g_config);
#ifndef NO_LOGGING
  EnableVerboseLog();
#endif  // NO_LOGGING
  IgnoreSigChild();
  ibus_main();

  if (g_config) {
    g_object_unref(g_config);
  }

  return 0;
}