/*************************************************************************/
/*  control.h                                                            */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                    http://www.godotengine.org                         */
/*************************************************************************/
/* Copyright (c) 2007-2016 Juan Linietsky, Ariel Manzur.                 */
/*                                                                       */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the       */
/* "Software"), to deal in the Software without restriction, including   */
/* without limitation the rights to use, copy, modify, merge, publish,   */
/* distribute, sublicense, and/or sell copies of the Software, and to    */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions:                                             */
/*                                                                       */
/* The above copyright notice and this permission notice shall be        */
/* included in all copies or substantial portions of the Software.       */
/*                                                                       */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
/*************************************************************************/
#ifndef CONTROL_H
#define CONTROL_H

#include "scene/main/node.h"
#include "scene/resources/theme.h"
#include "scene/main/timer.h"
#include "scene/2d/canvas_item.h"
#include "math_2d.h"
#include "rid.h"

/**
	@author Juan Linietsky <reduzio@gmail.com>
*/

class Viewport;
class Label;
class Panel;

class Control : public CanvasItem {
	
	OBJ_TYPE( Control, CanvasItem );
	OBJ_CATEGORY("GUI Nodes");

public:
	
	enum AnchorType {		
		ANCHOR_BEGIN,
		ANCHOR_END,
		ANCHOR_RATIO,
		ANCHOR_CENTER,
	};
	
	enum FocusMode {
		FOCUS_NONE,
		FOCUS_CLICK,
		FOCUS_ALL
	};

	enum SizeFlags {

		SIZE_EXPAND=1,
		SIZE_FILL=2,
		SIZE_EXPAND_FILL=SIZE_EXPAND|SIZE_FILL

	};

	enum CursorShape {
		CURSOR_ARROW,
		CURSOR_IBEAM,
		CURSOR_POINTING_HAND,
		CURSOR_CROSS,
		CURSOR_WAIT,
		CURSOR_BUSY,
		CURSOR_DRAG,
		CURSOR_CAN_DROP,
		CURSOR_FORBIDDEN,
		CURSOR_VSIZE,
		CURSOR_HSIZE,
		CURSOR_BDIAGSIZE,
		CURSOR_FDIAGSIZE,
		CURSOR_MOVE,
		CURSOR_VSPLIT,
		CURSOR_HSPLIT,
		CURSOR_HELP,
		CURSOR_MAX
	};

private:

	struct CComparator {

		bool operator()(const Control* p_a, const Control* p_b) const { return p_b->is_greater_than(p_a); }
	};

	struct Data {
			
		Point2 pos_cache;
		Size2 size_cache;

		float margin[4];
		AnchorType anchor[4];
		FocusMode focus_mode;

		float rotation;
		Vector2 scale;

		bool pending_resize;

		int h_size_flags;
		int v_size_flags;
		float expand;
		bool pending_min_size_update;
		Point2 custom_minimum_size;

		bool ignore_mouse;
		bool stop_mouse;

		Control *parent;
		Control *window;
		bool modal;
		bool modal_exclusive;
		Ref<Theme> theme;
		Control *theme_owner;		
		String tooltip;
		CursorShape default_cursor;

		List<Control*>::Element *MI; //modal item
		List<Control*>::Element *SI;

		CanvasItem *parent_canvas_item;

		Viewport *viewport;

		ObjectID modal_prev_focus_owner;

		NodePath focus_neighbour[4];

		HashMap<StringName, Ref<Texture>, StringNameHasher > icon_override;
		HashMap<StringName, Ref<StyleBox>, StringNameHasher > style_override;
		HashMap<StringName, Ref<Font>, StringNameHasher > font_override;
		HashMap<StringName, Color, StringNameHasher > color_override;
		HashMap<StringName, int, StringNameHasher > constant_override;
	} data;
	
	struct Window {
		// info used when this is a window 	

		bool key_event_accepted;
		Control *mouse_focus;
		int mouse_focus_button;
		Control *key_focus;
		Control *mouse_over;
		Control *tooltip;
		Panel *tooltip_popup;
		Label *tooltip_label;
		Point2 tooltip_pos;
		Point2 last_mouse_pos;
		Point2 drag_accum;
		bool drag_attempted;
		Variant drag_data;
		Control *drag_preview;
		Timer *tooltip_timer;
		List<Control*> modal_stack;
		unsigned int cancelled_input_ID;
		Matrix32 focus_inv_xform;
		bool subwindow_order_dirty;
		List<Control*> subwindows;
		bool disable_input;

		Window();
	};

	Window *window;
	
	// used internally
	Control* _find_next_visible_control_at_pos(Node* p_node,const Point2& p_global,Matrix32& r_xform) const;
	Control* _find_control_at_pos(CanvasItem* p_node,const Point2& p_pos,const Matrix32& p_xform,Matrix32& r_inv_xform);


	void _window_sort_subwindows();
	void _window_accept_event();
	void _window_remove_focus();
	void _window_cancel_input_ID(int p_input);
	void _window_sort_modal_stack();
	void _window_find_focus_neighbour(const Vector2& p_dir, Node *p_at, const Point2* p_points ,float p_min,float &r_closest_dist,Control **r_closest);
	Control *_get_focus_neighbour(Margin p_margin,int p_count=0);
	void _window_call_input(Control *p_control,const InputEvent& p_input);

	float _get_parent_range(int p_idx) const;
	float _get_range(int p_idx) const;
	float _s2a(float p_val, AnchorType p_anchor,float p_range) const;
	float _a2s(float p_val, AnchorType p_anchor,float p_range) const;
	void _modal_stack_remove();
	void _propagate_theme_changed(Control *p_owner);

	void _change_notify_margins();
	void _window_cancel_tooltip();
	void _window_show_tooltip();
	void _update_minimum_size();

	void _update_scroll();
	void _gui_input(const InputEvent& p_event); //used by scene main loop
	void _input_text(const String& p_text);
	void _resize(const Size2& p_size);

	void _size_changed();
	String _get_tooltip() const;

	void _set_rotation_deg(float p_rot);
	float _get_rotation_deg() const;

protected:	
	bool window_has_modal_stack() const;

	virtual void _window_input_event(InputEvent p_event);

	bool _set(const StringName& p_name, const Variant& p_value);
	bool _get(const StringName& p_name,Variant &r_ret) const;
	void _get_property_list( List<PropertyInfo> *p_list) const;

	void _notification(int p_notification);

	
	static void _bind_methods();	
	
	//bind helpers 
	
public:

	enum {
	
/*		NOTIFICATION_DRAW=30,
		NOTIFICATION_VISIBILITY_CHANGED=38*/
		NOTIFICATION_RESIZED=40,
		NOTIFICATION_MOUSE_ENTER=41,
		NOTIFICATION_MOUSE_EXIT=42,
		NOTIFICATION_FOCUS_ENTER=43,
		NOTIFICATION_FOCUS_EXIT=44,
		NOTIFICATION_THEME_CHANGED=45,
		NOTIFICATION_MODAL_CLOSE=46,


	};

	virtual Variant edit_get_state() const;
	virtual void edit_set_state(const Variant& p_state);
	virtual void edit_set_rect(const Rect2& p_edit_rect);
	virtual Size2 edit_get_minimum_size() const;

	void accept_event();

	virtual Size2 get_minimum_size() const;
	virtual Size2 get_combined_minimum_size() const;
	virtual bool has_point(const Point2& p_point) const;
	virtual bool clips_input() const;
	virtual Variant get_drag_data(const Point2& p_point);
	virtual bool can_drop_data(const Point2& p_point,const Variant& p_data) const;
	virtual void drop_data(const Point2& p_point,const Variant& p_data);
	void set_drag_preview(Control *p_control);
	void force_drag(const Variant& p_data,Control *p_control);

	void set_custom_minimum_size(const Size2& p_custom);
	Size2 get_custom_minimum_size() const;

	bool is_window() const;
	Control *get_window() const;
	Control *get_parent_control() const;


	
	/* POSITIONING */
	
	void set_anchor(Margin p_margin,AnchorType p_anchor);
	void set_anchor_and_margin(Margin p_margin,AnchorType p_anchor, float p_pos);
	
	AnchorType get_anchor(Margin p_margin) const;
		
	void set_margin(Margin p_margin,float p_value);
	
	void set_begin(const Point2& p_point); // helper
	void set_end(const Point2& p_point); // helper
	
	
	
	float get_margin(Margin p_margin) const;
	Point2 get_begin() const;
	Point2 get_end() const;
		
	void set_pos(const Point2& p_point);
	void set_size(const Size2& p_size);
	void set_global_pos(const Point2& p_point);
	
	Point2 get_pos() const;
	Point2 get_global_pos() const;
	Size2 get_size() const;
	Rect2 get_rect() const;
	Rect2 get_global_rect() const;
	Rect2 get_window_rect() const; ///< use with care, as it blocks waiting for the visual server

	void set_rotation(float p_rotation);
	float get_rotation() const;

	void set_scale(const Vector2& p_scale);
	Vector2 get_scale() const;

	
	void set_area_as_parent_rect(int p_margin=0);
	
	void show_modal(bool p_exclusive=false);

	void set_theme(const Ref<Theme>& p_theme);
	Ref<Theme> get_theme() const;

	void set_h_size_flags(int p_flags);
	int get_h_size_flags() const;

	void set_v_size_flags(int p_flags);
	int get_v_size_flags() const;

	void set_stretch_ratio(float p_ratio);
	float get_stretch_ratio() const;

	void minimum_size_changed();

	/* FOCUS */
	
	void set_focus_mode(FocusMode p_focus_mode);
	FocusMode get_focus_mode() const;
	bool has_focus() const;
	void grab_focus();
	void release_focus();

	Control *find_next_valid_focus() const;
	Control *find_prev_valid_focus() const;

	void set_focus_neighbour(Margin p_margin, const NodePath &p_neighbour);
	NodePath get_focus_neighbour(Margin p_margin) const;

	Control *get_focus_owner() const;

	void set_ignore_mouse(bool p_ignore);
	bool is_ignoring_mouse() const;

	void set_stop_mouse(bool p_stop);
	bool is_stopping_mouse() const;

	/* SKINNING */
	
	void add_icon_override(const StringName& p_name, const Ref<Texture>& p_icon);
	void add_style_override(const StringName& p_name, const Ref<StyleBox>& p_style);
	void add_font_override(const StringName& p_name, const Ref<Font>& p_font);
	void add_color_override(const StringName& p_name, const Color& p_color);
	void add_constant_override(const StringName& p_name, int p_constant);

	Ref<Texture> get_icon(const StringName& p_name,const StringName& p_type=StringName()) const;
	Ref<StyleBox> get_stylebox(const StringName& p_name,const StringName& p_type=StringName()) const;
	Ref<Font> get_font(const StringName& p_name,const StringName& p_type=StringName()) const;
	Color get_color(const StringName& p_name,const StringName& p_type=StringName()) const;
	int get_constant(const StringName& p_name,const StringName& p_type=StringName()) const;

	bool has_icon(const StringName& p_name,const StringName& p_type=StringName()) const;
	bool has_stylebox(const StringName& p_name,const StringName& p_type=StringName()) const;
	bool has_font(const StringName& p_name,const StringName& p_type=StringName()) const;
	bool has_color(const StringName& p_name,const StringName& p_type=StringName()) const;
	bool has_constant(const StringName& p_name,const StringName& p_type=StringName()) const;

	/* TOOLTIP */

	void set_tooltip(const String& p_tooltip);
	virtual String get_tooltip(const Point2& p_pos) const;

	/* CURSOR */

	void set_default_cursor_shape(CursorShape p_shape);
	CursorShape get_default_cursor_shape() const;
	virtual CursorShape get_cursor_shape(const Point2& p_pos=Point2i()) const;

	virtual Rect2 get_item_rect() const;
	virtual Matrix32 get_transform() const;

	bool is_toplevel_control() const;

	Size2 get_parent_area_size() const;

	void grab_click_focus();

	void warp_mouse(const Point2& p_to_pos);

	virtual bool is_text_field() const;

	Control();	
	~Control();

};

VARIANT_ENUM_CAST(Control::AnchorType);
VARIANT_ENUM_CAST(Control::FocusMode);
VARIANT_ENUM_CAST(Control::SizeFlags);
VARIANT_ENUM_CAST(Control::CursorShape);

#endif