#include "my_application.h"

#include <flutter_linux/flutter_linux.h>
#ifdef GDK_WINDOWING_X11
#include <gdk/gdkx.h>
#endif

#include "flutter/generated_plugin_registrant.h"

struct _MyApplication {
  GtkApplication parent_instance;
  char** dart_entrypoint_arguments;

  FlView *implicit_view;

  FlMethodChannel *view_channel;
};

G_DEFINE_TYPE(MyApplication, my_application, GTK_TYPE_APPLICATION)

static FlMethodResponse *add_view(MyApplication *self,
                                  FlMethodCall *method_call) {
  GtkWindow* window =
      GTK_WINDOW(gtk_application_window_new(GTK_APPLICATION(self)));
  gtk_window_set_default_size(window, 320, 240);
  gtk_widget_show(GTK_WIDGET(window));

  FlEngine *engine = fl_view_get_engine(self->implicit_view);
  FlView *view = fl_view_new_for_engine(engine);
  gtk_widget_show(GTK_WIDGET(view));
  gtk_container_add(GTK_CONTAINER(window), GTK_WIDGET(view));

  return FL_METHOD_RESPONSE(fl_method_success_response_new(nullptr));
}

// Sends the method call response to Flutter.
static void send_response(FlMethodCall *method_call,
                          FlMethodResponse *response) {
  g_autoptr(GError) error = nullptr;
  if (!fl_method_call_respond(method_call, response, &error)) {
    g_warning("Failed to send method call response: %s", error->message);
  }
}

static void view_method_call_cb(FlMethodChannel *channel,
                                FlMethodCall *method_call, gpointer user_data) {
  MyApplication *self = MY_APPLICATION(user_data);

  const gchar *method = fl_method_call_get_name(method_call);

  g_autoptr(FlMethodResponse) response = nullptr;
  if (strcmp(method, "Add") == 0) {
    response = add_view(self, method_call);
  } else {
    response = FL_METHOD_RESPONSE(fl_method_not_implemented_response_new());
  }

  if (response != nullptr) {
    send_response(method_call, response);
  }
}

// Implements GApplication::activate.
static void my_application_activate(GApplication* application) {
  MyApplication* self = MY_APPLICATION(application);
  GtkWindow* window =
      GTK_WINDOW(gtk_application_window_new(GTK_APPLICATION(application)));
  gtk_window_set_default_size(window, 640, 480);
  gtk_widget_show(GTK_WIDGET(window));

  g_autoptr(FlDartProject) project = fl_dart_project_new();
  fl_dart_project_set_dart_entrypoint_arguments(project, self->dart_entrypoint_arguments);

  self->implicit_view = fl_view_new(project);
  gtk_widget_show(GTK_WIDGET(self->implicit_view));
  gtk_container_add(GTK_CONTAINER(window), GTK_WIDGET(self->implicit_view));

  g_autoptr(FlStandardMethodCodec) codec = fl_standard_method_codec_new();
  FlEngine *engine = fl_view_get_engine(self->implicit_view);
  self->view_channel =
      fl_method_channel_new(fl_engine_get_binary_messenger(engine),
                            "flutter/view", FL_METHOD_CODEC(codec));
  fl_method_channel_set_method_call_handler(self->view_channel,
                                            view_method_call_cb, self, nullptr);

  fl_register_plugins(FL_PLUGIN_REGISTRY(self->implicit_view));

  gtk_widget_grab_focus(GTK_WIDGET(self->implicit_view));
}

// Implements GApplication::local_command_line.
static gboolean my_application_local_command_line(GApplication* application, gchar*** arguments, int* exit_status) {
  MyApplication* self = MY_APPLICATION(application);
  // Strip out the first argument as it is the binary name.
  self->dart_entrypoint_arguments = g_strdupv(*arguments + 1);

  g_autoptr(GError) error = nullptr;
  if (!g_application_register(application, nullptr, &error)) {
     g_warning("Failed to register: %s", error->message);
     *exit_status = 1;
     return TRUE;
  }

  g_application_activate(application);
  *exit_status = 0;

  return TRUE;
}

// Implements GApplication::startup.
static void my_application_startup(GApplication* application) {
  //MyApplication* self = MY_APPLICATION(object);

  // Perform any actions required at application startup.

  G_APPLICATION_CLASS(my_application_parent_class)->startup(application);
}

// Implements GApplication::shutdown.
static void my_application_shutdown(GApplication* application) {
  //MyApplication* self = MY_APPLICATION(object);

  // Perform any actions required at application shutdown.

  G_APPLICATION_CLASS(my_application_parent_class)->shutdown(application);
}

// Implements GObject::dispose.
static void my_application_dispose(GObject* object) {
  MyApplication* self = MY_APPLICATION(object);
  g_clear_pointer(&self->dart_entrypoint_arguments, g_strfreev);
  g_clear_object(&self->view_channel);
  G_OBJECT_CLASS(my_application_parent_class)->dispose(object);
}

static void my_application_class_init(MyApplicationClass* klass) {
  G_APPLICATION_CLASS(klass)->activate = my_application_activate;
  G_APPLICATION_CLASS(klass)->local_command_line = my_application_local_command_line;
  G_APPLICATION_CLASS(klass)->startup = my_application_startup;
  G_APPLICATION_CLASS(klass)->shutdown = my_application_shutdown;
  G_OBJECT_CLASS(klass)->dispose = my_application_dispose;
}

static void my_application_init(MyApplication* self) {}

MyApplication* my_application_new() {
  // Set the program name to the application ID, which helps various systems
  // like GTK and desktop environments map this running application to its
  // corresponding .desktop file. This ensures better integration by allowing
  // the application to be recognized beyond its binary name.
  g_set_prgname(APPLICATION_ID);

  return MY_APPLICATION(g_object_new(my_application_get_type(),
                                     "application-id", APPLICATION_ID,
                                     "flags", G_APPLICATION_NON_UNIQUE,
                                     nullptr));
}