/*************************************************************************/
/*  control_editor_plugin.h                                              */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md).   */
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/*************************************************************************/

#ifndef CONTROL_EDITOR_PLUGIN_H
#define CONTROL_EDITOR_PLUGIN_H

#include "editor/editor_plugin.h"
#include "scene/gui/box_container.h"
#include "scene/gui/button.h"
#include "scene/gui/check_box.h"
#include "scene/gui/control.h"
#include "scene/gui/label.h"
#include "scene/gui/margin_container.h"
#include "scene/gui/option_button.h"
#include "scene/gui/panel_container.h"
#include "scene/gui/popup.h"
#include "scene/gui/separator.h"
#include "scene/gui/texture_rect.h"

// Inspector controls.
class ControlPositioningWarning : public MarginContainer {
	GDCLASS(ControlPositioningWarning, MarginContainer);

	Control *control_node = nullptr;

	PanelContainer *bg_panel = nullptr;
	GridContainer *grid = nullptr;
	TextureRect *title_icon = nullptr;
	TextureRect *hint_icon = nullptr;
	Label *title_label = nullptr;
	Label *hint_label = nullptr;
	Control *hint_filler_left = nullptr;
	Control *hint_filler_right = nullptr;

	void _update_warning();
	void _update_toggler();
	virtual void gui_input(const Ref<InputEvent> &p_event) override;

protected:
	void _notification(int p_notification);

public:
	void set_control(Control *p_node);

	ControlPositioningWarning();
};

class EditorPropertyAnchorsPreset : public EditorProperty {
	GDCLASS(EditorPropertyAnchorsPreset, EditorProperty);
	OptionButton *options = nullptr;

	void _option_selected(int p_which);

protected:
	virtual void _set_read_only(bool p_read_only) override;

public:
	void setup(const Vector<String> &p_options);
	virtual void update_property() override;
	EditorPropertyAnchorsPreset();
};

class EditorPropertySizeFlags : public EditorProperty {
	GDCLASS(EditorPropertySizeFlags, EditorProperty);

	enum FlagPreset {
		SIZE_FLAGS_PRESET_FILL,
		SIZE_FLAGS_PRESET_SHRINK_BEGIN,
		SIZE_FLAGS_PRESET_SHRINK_CENTER,
		SIZE_FLAGS_PRESET_SHRINK_END,
		SIZE_FLAGS_PRESET_CUSTOM,
	};

	OptionButton *flag_presets = nullptr;
	CheckBox *flag_expand = nullptr;
	VBoxContainer *flag_options = nullptr;
	Vector<CheckBox *> flag_checks;

	bool vertical = false;

	bool keep_selected_preset = false;

	void _preset_selected(int p_which);
	void _expand_toggled();
	void _flag_toggled();

protected:
	virtual void _set_read_only(bool p_read_only) override;

public:
	void setup(const Vector<String> &p_options, bool p_vertical);
	virtual void update_property() override;
	EditorPropertySizeFlags();
};

class EditorInspectorPluginControl : public EditorInspectorPlugin {
	GDCLASS(EditorInspectorPluginControl, EditorInspectorPlugin);

public:
	virtual bool can_handle(Object *p_object) override;
	virtual void parse_group(Object *p_object, const String &p_group) override;
	virtual bool parse_property(Object *p_object, const Variant::Type p_type, const String &p_path, const PropertyHint p_hint, const String &p_hint_text, const uint32_t p_usage, const bool p_wide = false) override;
};

// Toolbar controls.
class ControlEditorPopupButton : public Button {
	GDCLASS(ControlEditorPopupButton, Button);

	Ref<Texture2D> arrow_icon;

	PopupPanel *popup_panel = nullptr;
	VBoxContainer *popup_vbox = nullptr;

	void _popup_visibility_changed(bool p_visible);

protected:
	void _notification(int p_what);

public:
	virtual Size2 get_minimum_size() const override;
	virtual void toggled(bool p_pressed) override;

	VBoxContainer *get_popup_hbox() const { return popup_vbox; }

	ControlEditorPopupButton();
};

class ControlEditorPresetPicker : public MarginContainer {
	GDCLASS(ControlEditorPresetPicker, MarginContainer);

	virtual void _preset_button_pressed(const int p_preset) {}

protected:
	static constexpr int grid_separation = 0;
	HashMap<int, Button *> preset_buttons;

	void _add_row_button(HBoxContainer *p_row, const int p_preset, const String &p_name);
	void _add_separator(BoxContainer *p_box, Separator *p_separator);

public:
	ControlEditorPresetPicker() {}
};

class AnchorPresetPicker : public ControlEditorPresetPicker {
	GDCLASS(AnchorPresetPicker, ControlEditorPresetPicker);

	virtual void _preset_button_pressed(const int p_preset) override;

protected:
	void _notification(int p_notification);
	static void _bind_methods();

public:
	AnchorPresetPicker();
};

class SizeFlagPresetPicker : public ControlEditorPresetPicker {
	GDCLASS(SizeFlagPresetPicker, ControlEditorPresetPicker);

	CheckBox *expand_button;

	bool vertical = false;

	virtual void _preset_button_pressed(const int p_preset) override;

protected:
	void _notification(int p_notification);
	static void _bind_methods();

public:
	void set_allowed_flags(Vector<SizeFlags> &p_flags);

	SizeFlagPresetPicker(bool p_vertical);
};

class ControlEditorToolbar : public HBoxContainer {
	GDCLASS(ControlEditorToolbar, HBoxContainer);

	UndoRedo *undo_redo = nullptr;
	EditorSelection *editor_selection = nullptr;

	ControlEditorPopupButton *anchors_button = nullptr;
	ControlEditorPopupButton *containers_button = nullptr;
	Button *anchor_mode_button = nullptr;

	SizeFlagPresetPicker *container_h_picker = nullptr;
	SizeFlagPresetPicker *container_v_picker = nullptr;

	bool anchors_mode = false;

	void _anchors_preset_selected(int p_preset);
	void _anchors_to_current_ratio();
	void _anchor_mode_toggled(bool p_status);
	void _container_flags_selected(int p_flags, bool p_vertical);

	Vector2 _anchor_to_position(const Control *p_control, Vector2 anchor);
	Vector2 _position_to_anchor(const Control *p_control, Vector2 position);
	bool _is_node_locked(const Node *p_node);
	List<Control *> _get_edited_controls();
	void _selection_changed();

protected:
	void _notification(int p_notification);

	static ControlEditorToolbar *singleton;

public:
	bool is_anchors_mode_enabled() { return anchors_mode; };

	static ControlEditorToolbar *get_singleton() { return singleton; }

	ControlEditorToolbar();
};

// Editor plugin.
class ControlEditorPlugin : public EditorPlugin {
	GDCLASS(ControlEditorPlugin, EditorPlugin);

	ControlEditorToolbar *toolbar = nullptr;

public:
	virtual String get_name() const override { return "Control"; }

	ControlEditorPlugin();
};

#endif // CONTROL_EDITOR_PLUGIN_H