#include <Elementary.h>
#include "elm_priv.h"

/**
 * @defgroup Radio Radio
 *
 * The radio button allows for 1 or more selectors to be created to select 1
 * of a set of options.
 *
 * Signals that you can add callbacks for are:
 *
 * changed - This is called whenever the user changes the state of one of the
 * radio objects within the group of radio objects that work together.
 *
 * A radio object contains an indicator, an optional Label and an optional
 * icon object. They work normally in groups of 2 or more. When you create a
 * radio (if it is not the first member of the group), simply add it to the
 * group by adding it to any other member of the group that already exists
 * (or the first member) with elm_radio_group_add() with the second parameter
 * being the existing group member. The radio object(s) will select from one
 * of a set of integer values, so any value they are configuring needs to be
 * mapped to a set of integers. To configure what value that radio object
 * represents, use  elm_radio_state_value_set() to set the integer it
 * represents. To set the value the whole group is to indicate use
 * elm_radio_value_set() on any group member, and to get the groups value use
 * elm_radio_value_get(). For convenience the radio objects are also able to
 * directly set an integer (int) to the value that is selected. To specify
 * the pointer to this integer to modify, use elm_radio_value_pointer_set().
 * The radio objects will modify this directly. That implies the pointer must
 * point to valid memory for as long as the radio objects exist.
 */

typedef struct _Widget_Data Widget_Data;
typedef struct _Group Group;

struct _Group
{
   int value;
   int *valuep;
   Eina_List *radios;
};

struct _Widget_Data
{
   Evas_Object *radio;
   Evas_Object *icon;
   int value;
   const char *label;
   Eina_Bool state;
   Group *group;
};

static const char *widtype = NULL;
static void _state_set(Evas_Object *obj, Eina_Bool state);
static void _del_hook(Evas_Object *obj);
static void _theme_hook(Evas_Object *obj);
static void _disable_hook(Evas_Object *obj);
static void _sizing_eval(Evas_Object *obj);
static void _changed_size_hints(void *data, Evas *e, Evas_Object *obj, void *event_info);
static void _sub_del(void *data, Evas_Object *obj, void *event_info);
static void _signal_radio_on(void *data, Evas_Object *obj, const char *emission, const char *source);

static const char SIG_CHANGED[] = "changed";
static const Evas_Smart_Cb_Description _signals[] = {
  {SIG_CHANGED, ""},
  {NULL, NULL}
};

static void
_del_hook(Evas_Object *obj)
{
   Widget_Data *wd = elm_widget_data_get(obj);
   if (!wd) return;
   if (wd->label) eina_stringshare_del(wd->label);
   wd->group->radios = eina_list_remove(wd->group->radios, obj);
   if (!wd->group->radios) free(wd->group);
   wd->group = NULL;
   free(wd);
}

static void
_theme_hook(Evas_Object *obj)
{
   Widget_Data *wd = elm_widget_data_get(obj);
   if (!wd) return;
   _elm_theme_object_set(obj, wd->radio, "radio", "base", elm_widget_style_get(obj));
   if (wd->icon)
     edje_object_signal_emit(wd->radio, "elm,state,icon,visible", "elm");
   else
     edje_object_signal_emit(wd->radio, "elm,state,icon,hidden", "elm");
   if (wd->state)
     edje_object_signal_emit(wd->radio, "elm,state,radio,on", "elm");
   else
     edje_object_signal_emit(wd->radio, "elm,state,radio,off", "elm");
   if (wd->label)
     edje_object_signal_emit(wd->radio, "elm,state,text,visible", "elm");
   else
     edje_object_signal_emit(wd->radio, "elm,state,text,hidden", "elm");
   edje_object_part_text_set(wd->radio, "elm.text", wd->label);
   edje_object_message_signal_process(wd->radio);
   edje_object_scale_set(wd->radio, elm_widget_scale_get(obj) * _elm_config->scale);
   _sizing_eval(obj);
}

static void
_disable_hook(Evas_Object *obj)
{
   Widget_Data *wd = elm_widget_data_get(obj);
   if (!wd) return;
   if (elm_widget_disabled_get(obj))
     {
        edje_object_signal_emit(wd->radio, "elm,state,disabled", "elm");
        if (wd->state) _state_set(obj, 0);
     }
   else
     edje_object_signal_emit(wd->radio, "elm,state,enabled", "elm");
}

static void
_sizing_eval(Evas_Object *obj)
{
   Widget_Data *wd = elm_widget_data_get(obj);
   Evas_Coord minw = -1, minh = -1;
   if (!wd) return;
   elm_coords_finger_size_adjust(1, &minw, 1, &minh);
   edje_object_size_min_restricted_calc(wd->radio, &minw, &minh, minw, minh);
   elm_coords_finger_size_adjust(1, &minw, 1, &minh);
   evas_object_size_hint_min_set(obj, minw, minh);
   evas_object_size_hint_max_set(obj, -1, -1);
}

static void
_changed_size_hints(void *data, Evas *e __UNUSED__, Evas_Object *obj, void *event_info __UNUSED__)
{
   Widget_Data *wd = elm_widget_data_get(data);
   if (!wd) return;
   if (obj != wd->icon) return;
   _sizing_eval(data);
}

static void
_sub_del(void *data __UNUSED__, Evas_Object *obj, void *event_info)
{
   Widget_Data *wd = elm_widget_data_get(obj);
   Evas_Object *sub = event_info;
   if (!wd) return;
   if (sub == wd->icon)
     {
	edje_object_signal_emit(wd->radio, "elm,state,icon,hidden", "elm");
	evas_object_event_callback_del_full
	  (sub, EVAS_CALLBACK_CHANGED_SIZE_HINTS, _changed_size_hints, obj);
	wd->icon = NULL;
	_sizing_eval(obj);
     }
}

static void
_state_set(Evas_Object *obj, Eina_Bool state)
{
   Widget_Data *wd = elm_widget_data_get(obj);
   if (!wd) return;
   if ((state != wd->state) && (!elm_widget_disabled_get(obj)))
     {
	wd->state = state;
	if (wd->state)
	  edje_object_signal_emit(wd->radio, "elm,state,radio,on", "elm");
	else
	  edje_object_signal_emit(wd->radio, "elm,state,radio,off", "elm");
     }
}

static void
_state_set_all(Widget_Data *wd)
{
   const Eina_List *l;
   Evas_Object *child, *selected = NULL;
   Eina_Bool disabled = EINA_FALSE;
   EINA_LIST_FOREACH(wd->group->radios, l, child)
     {
	Widget_Data *wd2 = elm_widget_data_get(child);
        if (wd2->state) selected = child;
	if (wd2->value == wd->group->value)
          {
             _state_set(child, 1);
             if (!wd2->state) disabled = EINA_TRUE;
          }
	else _state_set(child, 0);
     }
   if (disabled && selected) _state_set(selected, 1);
}

static void
_signal_radio_on(void *data, Evas_Object *obj __UNUSED__, const char *emission __UNUSED__, const char *source __UNUSED__)
{
   Widget_Data *wd = elm_widget_data_get(data);
   if (!wd) return;
   if (wd->group->value == wd->value) return;
   wd->group->value = wd->value;
   if (wd->group->valuep) *(wd->group->valuep) = wd->group->value;
   _state_set_all(wd);
   evas_object_smart_callback_call(data, SIG_CHANGED, NULL);
}

/**
  * Add a new radio to the parent
  *
  * @param parent The parent object
  * @return The new object or NULL if it cannot be created
  *
  * @ingroup Radio
  */
EAPI Evas_Object *
elm_radio_add(Evas_Object *parent)
{
   Evas_Object *obj;
   Evas *e;
   Widget_Data *wd;

   wd = ELM_NEW(Widget_Data);
   e = evas_object_evas_get(parent);
   obj = elm_widget_add(e);
   ELM_SET_WIDTYPE(widtype, "radio");
   elm_widget_type_set(obj, "radio");
   elm_widget_sub_object_add(parent, obj);
   elm_widget_data_set(obj, wd);
   elm_widget_del_hook_set(obj, _del_hook);
   elm_widget_theme_hook_set(obj, _theme_hook);
   elm_widget_disable_hook_set(obj, _disable_hook);

   wd->radio = edje_object_add(e);
   _elm_theme_object_set(obj, wd->radio, "radio", "base", "default");
   edje_object_signal_callback_add(wd->radio, "elm,action,radio,on", "", _signal_radio_on, obj);
   edje_object_signal_callback_add(wd->radio, "elm,action,radio,toggle", "", _signal_radio_on, obj);
   elm_widget_resize_object_set(obj, wd->radio);

   evas_object_smart_callback_add(obj, "sub-object-del", _sub_del, obj);

   wd->group = calloc(1, sizeof(Group));
   wd->group->radios = eina_list_append(wd->group->radios, obj);
   wd->state = 0;

   _sizing_eval(obj);

   // TODO: convert Elementary to subclassing of Evas_Smart_Class
   // TODO: and save some bytes, making descriptions per-class and not instance!
   evas_object_smart_callbacks_descriptions_set(obj, _signals);
   return obj;
}

/**
 * Set the text label of the radio object
 *
 * @param obj The radio object
 * @param label The text label string in UTF-8
 *
 * @ingroup Radio
 */
EAPI void
elm_radio_label_set(Evas_Object *obj, const char *label)
{
   ELM_CHECK_WIDTYPE(obj, widtype);
   Widget_Data *wd = elm_widget_data_get(obj);
   if (!wd) return;
   eina_stringshare_replace(&wd->label, label);
   if (label)
     {
	edje_object_signal_emit(wd->radio, "elm,state,text,visible", "elm");
	edje_object_message_signal_process(wd->radio);
     }
   else
     {
	edje_object_signal_emit(wd->radio, "elm,state,text,hidden", "elm");
	edje_object_message_signal_process(wd->radio);
     }
   edje_object_part_text_set(wd->radio, "elm.text", label);
   _sizing_eval(obj);
}

/**
 * Get the text label of the radio object
 *
 * @param obj The radio object
 * @return The text label string in UTF-8
 *
 * @ingroup Radio
 */
EAPI const char *
elm_radio_label_get(const Evas_Object *obj)
{
   ELM_CHECK_WIDTYPE(obj, widtype) NULL;
   Widget_Data *wd = elm_widget_data_get(obj);
   if (!wd) return NULL;
   return wd->label;
}

/**
 * Set the icon object of the radio object
 *
 * Once the icon object is set, a previously set one will be deleted.
 *
 * @param obj The radio object
 * @param icon The icon object
 *
 * @ingroup Radio
 */
EAPI void
elm_radio_icon_set(Evas_Object *obj, Evas_Object *icon)
{
   ELM_CHECK_WIDTYPE(obj, widtype);
   Widget_Data *wd = elm_widget_data_get(obj);
   if (!wd) return;
   if (wd->icon == icon) return;
   if (wd->icon) evas_object_del(wd->icon);
   wd->icon = icon;
   if (icon)
     {
	elm_widget_sub_object_add(obj, icon);
	evas_object_event_callback_add(icon, EVAS_CALLBACK_CHANGED_SIZE_HINTS,
				       _changed_size_hints, obj);
	edje_object_part_swallow(wd->radio, "elm.swallow.content", icon);
	edje_object_signal_emit(wd->radio, "elm,state,icon,visible", "elm");
	edje_object_message_signal_process(wd->radio);
     }
   _sizing_eval(obj);
}

/**
 * Get the icon object of the radio object
 *
 * @param obj The radio object
 * @return The icon object
 *
 * @ingroup Radio
 */
EAPI Evas_Object *
elm_radio_icon_get(const Evas_Object *obj)
{
   ELM_CHECK_WIDTYPE(obj, widtype) NULL;
   Widget_Data *wd = elm_widget_data_get(obj);
   if (!wd) return NULL;
   return wd->icon;
}

/**
 * Add this radio to a group of other radio objects
 *
 * Radio objects work in groups. Each member should have a different integer
 * value assigned. In order ro have them work as a group, they need to know
 * about eacthother. This adds the given radio object to the group of which
 * the group object indicated is a member.
 *
 * @param obj The radio object
 * @param group The object whose group the object is to join
 *
 * @ingroup Radio
 */
EAPI void
elm_radio_group_add(Evas_Object *obj, Evas_Object *group)
{
   ELM_CHECK_WIDTYPE(obj, widtype);
   Widget_Data *wd = elm_widget_data_get(obj);
   Widget_Data *wd2 = elm_widget_data_get(group);
   if (!wd) return;
   if (!wd2)
     {
	if (eina_list_count(wd->group->radios) == 1)
	  return;
	wd->group->radios = eina_list_remove(wd->group->radios, obj);
	wd->group = calloc(1, sizeof(Group));
	wd->group->radios = eina_list_append(wd->group->radios, obj);
     }
   else if (wd->group == wd2->group) return;
   else
     {
	wd->group->radios = eina_list_remove(wd->group->radios, obj);
	if (!wd->group->radios) free(wd->group);
	wd->group = wd2->group;
	wd->group->radios = eina_list_append(wd->group->radios, obj);
     }
   if (wd->value == wd->group->value) _state_set(obj, 1);
   else _state_set(obj, 0);
}

/**
 * Set the integer value that this radio object represents
 *
 * This sets the value of the radio.
 *
 * @param obj The radio object
 * @param value The value to use if this radio object is selected
 *
 * @ingroup Radio
 */
EAPI void
elm_radio_state_value_set(Evas_Object *obj, int value)
{
   ELM_CHECK_WIDTYPE(obj, widtype);
   Widget_Data *wd = elm_widget_data_get(obj);
   if (!wd) return;
   wd->value = value;
   if (wd->value == wd->group->value) _state_set(obj, 1);
   else _state_set(obj, 0);
}

/**
 * Set the value of the radio.
 *
 * This sets the value of the radio group and will also set the value if
 * pointed to, to the value supplied, but will not call any callbacks.
 *
 * @param obj The radio object
 * @param value The value to use for the group
 *
 * @ingroup Radio
 */
EAPI void
elm_radio_value_set(Evas_Object *obj, int value)
{
   ELM_CHECK_WIDTYPE(obj, widtype);
   Widget_Data *wd = elm_widget_data_get(obj);
   if (!wd) return;
   if (value == wd->group->value) return;
   wd->group->value = value;
   if (wd->group->valuep) *(wd->group->valuep) = wd->group->value;
   _state_set_all(wd);
}

/**
 * Get the state of the radio object
 *
 * @param obj The radio object
 * @return The integer state
 *
 * @ingroup Radio
 */
EAPI int
elm_radio_value_get(const Evas_Object *obj)
{
   ELM_CHECK_WIDTYPE(obj, widtype) 0;
   Widget_Data *wd = elm_widget_data_get(obj);
   if (!wd) return 0;
   return wd->group->value;
}

/**
 * Set a convenience pointer to a integer to change
 *
 * This sets a pointer to a integer, that, in addition to the radio objects
 * state will also be modified directly. To stop setting the object pointed
 * to simply use NULL as the valuep parameter. If valuep is not NULL, then
 * when this is called, the radio objects state will also be modified to
 * reflect the value of the integer valuep points to, just like calling
 * elm_radio_value_set().
 *
 * @param obj The radio object
 * @param valuep Pointer to the integer to modify
 *
 * @ingroup Radio
 */
EAPI void
elm_radio_value_pointer_set(Evas_Object *obj, int *valuep)
{
   ELM_CHECK_WIDTYPE(obj, widtype);
   Widget_Data *wd = elm_widget_data_get(obj);
   if (!wd) return;
   if (valuep)
     {
	wd->group->valuep = valuep;
	if (*(wd->group->valuep) != wd->group->value)
	  {
	     wd->group->value = *(wd->group->valuep);
	     _state_set_all(wd);
	  }
     }
   else
     {
	wd->group->valuep = NULL;
     }
}