/*************************************************************************/
/*  tab_bar.h                                                            */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md).   */
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/*************************************************************************/

#ifndef TAB_BAR_H
#define TAB_BAR_H

#include "scene/gui/control.h"
#include "scene/resources/text_line.h"

class TabBar : public Control {
	GDCLASS(TabBar, Control);

public:
	enum TabAlign {
		ALIGN_LEFT,
		ALIGN_CENTER,
		ALIGN_RIGHT,
		ALIGN_MAX
	};

	enum CloseButtonDisplayPolicy {
		CLOSE_BUTTON_SHOW_NEVER,
		CLOSE_BUTTON_SHOW_ACTIVE_ONLY,
		CLOSE_BUTTON_SHOW_ALWAYS,
		CLOSE_BUTTON_MAX
	};

private:
	struct Tab {
		String text;
		String xl_text;

		Dictionary opentype_features;
		String language;
		Control::TextDirection text_direction = Control::TEXT_DIRECTION_INHERITED;

		Ref<TextLine> text_buf;
		Ref<Texture2D> icon;
		int ofs_cache = 0;
		bool disabled = false;
		int size_cache = 0;
		int size_text = 0;
		int x_cache = 0;
		int x_size_cache = 0;

		Ref<Texture2D> right_button;
		Rect2 rb_rect;
		Rect2 cb_rect;
	};

	int offset = 0;
	int max_drawn_tab = 0;
	int highlight_arrow = -1;
	bool buttons_visible = false;
	bool missing_right = false;
	Vector<Tab> tabs;
	int current = 0;
	int previous = 0;
	int _get_top_margin() const;
	TabAlign tab_align = ALIGN_CENTER;
	bool clip_tabs = true;
	int rb_hover = -1;
	bool rb_pressing = false;

	bool select_with_rmb = false;

	int cb_hover = -1;
	bool cb_pressing = false;
	CloseButtonDisplayPolicy cb_displaypolicy = CLOSE_BUTTON_SHOW_NEVER;

	int hover = -1; // Hovered tab.
	int min_width = 0;
	bool scrolling_enabled = true;
	bool drag_to_rearrange_enabled = false;
	int tabs_rearrange_group = -1;

	int get_tab_width(int p_idx) const;
	void _ensure_no_over_offset();

	void _update_hover();
	void _update_cache();

	void _on_mouse_exited();

	void _shape(int p_tab);

protected:
	virtual void gui_input(const Ref<InputEvent> &p_event) override;
	void _notification(int p_what);
	static void _bind_methods();

	Variant get_drag_data(const Point2 &p_point) override;
	bool can_drop_data(const Point2 &p_point, const Variant &p_data) const override;
	void drop_data(const Point2 &p_point, const Variant &p_data) override;
	int get_tab_idx_at_point(const Point2 &p_point) const;

public:
	void add_tab(const String &p_str = "", const Ref<Texture2D> &p_icon = Ref<Texture2D>());

	void set_tab_title(int p_tab, const String &p_title);
	String get_tab_title(int p_tab) const;

	void set_tab_text_direction(int p_tab, TextDirection p_text_direction);
	TextDirection get_tab_text_direction(int p_tab) const;

	void set_tab_opentype_feature(int p_tab, const String &p_name, int p_value);
	int get_tab_opentype_feature(int p_tab, const String &p_name) const;
	void clear_tab_opentype_features(int p_tab);

	void set_tab_language(int p_tab, const String &p_language);
	String get_tab_language(int p_tab) const;

	void set_tab_icon(int p_tab, const Ref<Texture2D> &p_icon);
	Ref<Texture2D> get_tab_icon(int p_tab) const;

	void set_tab_disabled(int p_tab, bool p_disabled);
	bool get_tab_disabled(int p_tab) const;

	void set_tab_right_button(int p_tab, const Ref<Texture2D> &p_right_button);
	Ref<Texture2D> get_tab_right_button(int p_tab) const;

	void set_tab_align(TabAlign p_align);
	TabAlign get_tab_align() const;

	void set_clip_tabs(bool p_clip_tabs);
	bool get_clip_tabs() const;

	void move_tab(int from, int to);

	void set_tab_close_display_policy(CloseButtonDisplayPolicy p_policy);
	CloseButtonDisplayPolicy get_tab_close_display_policy() const;

	int get_tab_count() const;
	void set_current_tab(int p_current);
	int get_current_tab() const;
	int get_previous_tab() const;
	int get_hovered_tab() const;

	int get_tab_offset() const;
	bool get_offset_buttons_visible() const;

	void remove_tab(int p_idx);

	void clear_tabs();

	void set_scrolling_enabled(bool p_enabled);
	bool get_scrolling_enabled() const;

	void set_drag_to_rearrange_enabled(bool p_enabled);
	bool get_drag_to_rearrange_enabled() const;
	void set_tabs_rearrange_group(int p_group_id);
	int get_tabs_rearrange_group() const;

	void set_select_with_rmb(bool p_enabled);
	bool get_select_with_rmb() const;

	void ensure_tab_visible(int p_idx);
	void set_min_width(int p_width);

	Rect2 get_tab_rect(int p_tab) const;
	Size2 get_minimum_size() const override;

	TabBar();
};

VARIANT_ENUM_CAST(TabBar::TabAlign);
VARIANT_ENUM_CAST(TabBar::CloseButtonDisplayPolicy);

#endif // TAB_BAR_H