#include "desktop/gui.h"
#include "desktop/gui_factory.h"

struct gui_table *guit = NULL;


static void gui_default_quit(void)
{
}

static void gui_default_set_search_ico(hlcache_handle *ico)
{
}


static void gui_default_window_set_title(struct gui_window *g, const char *title)
{
}

static void gui_default_window_set_url(struct gui_window *g, const char *url)
{
}

static void gui_default_window_start_throbber(struct gui_window *g)
{
}

static void gui_default_window_stop_throbber(struct gui_window *g)
{
}

static bool gui_default_window_drag_start(struct gui_window *g,
					  gui_drag_type type,
					  const struct rect *rect)
{
	return true;
}

static void gui_default_window_save_link(struct gui_window *g,
					 const char *url,
					 const char *title)
{
}

static void gui_default_window_set_icon(struct gui_window *g,
					hlcache_handle *icon)
{
}

static void gui_default_window_scroll_visible(struct gui_window *g,
				       int x0, int y0,
				       int x1, int y1)
{
	guit->window->set_scroll(g, x0, y0);
}

static void gui_default_window_new_content(struct gui_window *g)
{
}

static bool gui_default_window_scroll_start(struct gui_window *g)
{
	return true;
}


/** verify window table is valid */
static nserror verify_window_register(struct gui_window_table *gwt)
{
	/* check table is present */
	if (gwt == NULL) {
		return NSERROR_BAD_PARAMETER;
	}

	/* check the mandantory fields are set */
	if (gwt->create == NULL) {
		return NSERROR_BAD_PARAMETER;
	}
	if (gwt->destroy == NULL) {
		return NSERROR_BAD_PARAMETER;
	}
	if (gwt->redraw == NULL) {
		return NSERROR_BAD_PARAMETER;
	}
	if (gwt->update == NULL) {
		return NSERROR_BAD_PARAMETER;
	}
	if (gwt->get_scroll == NULL) {
		return NSERROR_BAD_PARAMETER;
	}
	if (gwt->set_scroll == NULL) {
		return NSERROR_BAD_PARAMETER;
	}
	if (gwt->get_dimensions == NULL) {
		return NSERROR_BAD_PARAMETER;
	}
	if (gwt->update_extent == NULL) {
		return NSERROR_BAD_PARAMETER;
	}


	/* fill in the optional entries with defaults */
	if (gwt->set_title == NULL) {
		gwt->set_title = gui_default_window_set_title;
	}
	if (gwt->set_url == NULL) {
		gwt->set_url = gui_default_window_set_url;
	}
	if (gwt->start_throbber == NULL) {
		gwt->start_throbber = gui_default_window_start_throbber;
	}
	if (gwt->stop_throbber == NULL) {
		gwt->stop_throbber = gui_default_window_stop_throbber;
	}
	if (gwt->drag_start == NULL) {
		gwt->drag_start = gui_default_window_drag_start;
	}
	if (gwt->save_link == NULL) {
		gwt->save_link = gui_default_window_save_link;
	}
	if (gwt->set_icon == NULL) {
		gwt->set_icon = gui_default_window_set_icon;
	}
	if (gwt->scroll_visible == NULL) {
		gwt->scroll_visible = gui_default_window_scroll_visible;
	}
	if (gwt->new_content == NULL) {
		gwt->new_content = gui_default_window_new_content;
	}
	if (gwt->scroll_start == NULL) {
		gwt->scroll_start = gui_default_window_scroll_start;
	}

	return NSERROR_OK;
}

nserror gui_factory_register(struct gui_table *gt)
{
	nserror err;

	/* ensure not already initialised */
	if (guit != NULL) {
		return NSERROR_INIT_FAILED;
	}

	/* check table is present */
	if (gt == NULL) {
		return NSERROR_BAD_PARAMETER;
	}

	/* check subtables */
	err = verify_window_register(gt->window);
	if (err != NSERROR_OK) {
		return err;
	}

	/* check the mandantory fields are set */
	if (gt->poll == NULL) {
		return NSERROR_BAD_PARAMETER;
	}

	/* fill in the optional entries with defaults */
	if (gt->quit == NULL) {
		gt->quit = gui_default_quit;
	}
	if (gt->set_search_ico == NULL) {
		gt->set_search_ico = gui_default_set_search_ico;
	}

	guit = gt;

	return NSERROR_OK;
}