/*************************************************************************/
/*  visual_shader_editor_plugin.h                                        */
/*************************************************************************/
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/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md).   */
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#ifndef VISUAL_SHADER_EDITOR_PLUGIN_H
#define VISUAL_SHADER_EDITOR_PLUGIN_H

#include "editor/editor_node.h"
#include "editor/editor_plugin.h"
#include "editor/property_editor.h"
#include "scene/gui/button.h"
#include "scene/gui/graph_edit.h"
#include "scene/gui/popup.h"
#include "scene/gui/tree.h"
#include "scene/resources/visual_shader.h"

class VisualShaderNodePlugin : public Reference {

	GDCLASS(VisualShaderNodePlugin, Reference);

protected:
	static void _bind_methods();

public:
	virtual Control *create_editor(const Ref<Resource> &p_parent_resource, const Ref<VisualShaderNode> &p_node);
};

class VisualShaderEditor : public VBoxContainer {

	GDCLASS(VisualShaderEditor, VBoxContainer);

	CustomPropertyEditor *property_editor;
	int editing_node;
	int editing_port;

	Ref<VisualShader> visual_shader;
	HSplitContainer *main_box;
	GraphEdit *graph;
	ToolButton *add_node;
	ToolButton *preview_shader;

	OptionButton *edit_type;

	PanelContainer *error_panel;
	Label *error_label;

	bool pending_update_preview;
	bool shader_error;
	VBoxContainer *preview_vbox;
	TextEdit *preview_text;
	Label *error_text;

	UndoRedo *undo_redo;
	Point2 saved_node_pos;
	bool saved_node_pos_dirty;

	ConfirmationDialog *members_dialog;
	MenuButton *tools;

	bool preview_showed;

	enum ToolsMenuOptions {
		EXPAND_ALL,
		COLLAPSE_ALL
	};

	Tree *members;
	AcceptDialog *alert;
	LineEdit *node_filter;
	RichTextLabel *node_desc;

	void _tools_menu_option(int p_idx);
	void _show_members_dialog(bool at_mouse_pos);

	void _update_graph();

	struct AddOption {
		String name;
		String category;
		String sub_category;
		String type;
		String description;
		int sub_func;
		String sub_func_str;
		Ref<Script> script;
		int mode;
		int return_type;
		int func;
		float value;
		bool highend;
		bool is_custom;

		AddOption(const String &p_name = String(), const String &p_category = String(), const String &p_sub_category = String(), const String &p_type = String(), const String &p_description = String(), int p_sub_func = -1, int p_return_type = -1, int p_mode = -1, int p_func = -1, float p_value = -1, bool p_highend = false) {
			name = p_name;
			type = p_type;
			category = p_category;
			sub_category = p_sub_category;
			description = p_description;
			sub_func = p_sub_func;
			return_type = p_return_type;
			mode = p_mode;
			func = p_func;
			value = p_value;
			highend = p_highend;
			is_custom = false;
		}

		AddOption(const String &p_name, const String &p_category, const String &p_sub_category, const String &p_type, const String &p_description, const String &p_sub_func, int p_return_type = -1, int p_mode = -1, int p_func = -1, float p_value = -1, bool p_highend = false) {
			name = p_name;
			type = p_type;
			category = p_category;
			sub_category = p_sub_category;
			description = p_description;
			sub_func = 0;
			sub_func_str = p_sub_func;
			return_type = p_return_type;
			mode = p_mode;
			func = p_func;
			value = p_value;
			highend = p_highend;
			is_custom = false;
		}
	};

	Vector<AddOption> add_options;
	int texture_node_option_idx;
	int custom_node_option_idx;
	List<String> keyword_list;

	void _draw_color_over_button(Object *obj, Color p_color);

	void _add_custom_node(const String &p_path);
	void _add_texture_node(const String &p_path);
	VisualShaderNode *_add_node(int p_idx, int p_op_idx = -1);
	void _update_options_menu();

	void _show_preview_text();
	void _update_preview();
	String _get_description(int p_idx);

	static VisualShaderEditor *singleton;

	void _node_dragged(const Vector2 &p_from, const Vector2 &p_to, int p_node);
	bool updating;

	void _connection_request(const String &p_from, int p_from_index, const String &p_to, int p_to_index);
	void _disconnection_request(const String &p_from, int p_from_index, const String &p_to, int p_to_index);

	void _scroll_changed(const Vector2 &p_scroll);
	void _node_selected(Object *p_node);

	void _delete_request(int);
	void _on_nodes_delete();

	void _removed_from_graph();

	void _node_changed(int p_id);

	void _edit_port_default_input(Object *p_button, int p_node, int p_port);
	void _port_edited();

	int to_node;
	int to_slot;
	int from_node;
	int from_slot;

	void _connection_to_empty(const String &p_from, int p_from_slot, const Vector2 &p_release_position);
	void _connection_from_empty(const String &p_to, int p_to_slot, const Vector2 &p_release_position);

	void _line_edit_changed(const String &p_text, Object *line_edit, int p_node_id);
	void _line_edit_focus_out(Object *line_edit, int p_node_id);

	void _port_name_focus_out(Object *line_edit, int p_node_id, int p_port_id, bool p_output);

	void _dup_copy_nodes(int p_type, List<int> &r_nodes, Set<int> &r_excluded);
	void _dup_update_excluded(int p_type, Set<int> &r_excluded);
	void _dup_paste_nodes(int p_type, int p_pasted_type, List<int> &r_nodes, Set<int> &r_excluded, const Vector2 &p_offset, bool p_select);

	void _duplicate_nodes();

	Vector2 selection_center;
	int copy_type; // shader type
	List<int> copy_nodes_buffer;
	Set<int> copy_nodes_excluded_buffer;

	void _clear_buffer();
	void _copy_nodes();
	void _paste_nodes();

	Vector<Ref<VisualShaderNodePlugin> > plugins;

	void _mode_selected(int p_id);
	void _rebuild();

	void _input_select_item(Ref<VisualShaderNodeInput> input, String name);

	void _add_input_port(int p_node, int p_port, int p_port_type, const String &p_name);
	void _remove_input_port(int p_node, int p_port);
	void _change_input_port_type(int p_type, int p_node, int p_port);
	void _change_input_port_name(const String &p_text, Object *line_edit, int p_node, int p_port);

	void _add_output_port(int p_node, int p_port, int p_port_type, const String &p_name);
	void _remove_output_port(int p_node, int p_port);
	void _change_output_port_type(int p_type, int p_node, int p_port);
	void _change_output_port_name(const String &p_text, Object *line_edit, int p_node, int p_port);

	void _expression_focus_out(Object *text_edit, int p_node);

	void _set_node_size(int p_type, int p_node, const Size2 &p_size);
	void _node_resized(const Vector2 &p_new_size, int p_type, int p_node);

	void _preview_select_port(int p_node, int p_port);
	void _graph_gui_input(const Ref<InputEvent> &p_event);

	void _member_filter_changed(const String &p_text);
	void _sbox_input(const Ref<InputEvent> &p_ie);
	void _member_selected();
	void _member_unselected();
	void _member_create();
	void _member_cancel();

	Variant get_drag_data_fw(const Point2 &p_point, Control *p_from);
	bool can_drop_data_fw(const Point2 &p_point, const Variant &p_data, Control *p_from) const;
	void drop_data_fw(const Point2 &p_point, const Variant &p_data, Control *p_from);

	bool _is_available(int p_mode);
	void _update_created_node(GraphNode *node);

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

public:
	void update_custom_nodes();
	void add_plugin(const Ref<VisualShaderNodePlugin> &p_plugin);
	void remove_plugin(const Ref<VisualShaderNodePlugin> &p_plugin);

	static VisualShaderEditor *get_singleton() { return singleton; }

	void clear_custom_types();
	void add_custom_type(const String &p_name, const Ref<Script> &p_script, const String &p_description, int p_return_icon_type, const String &p_category, const String &p_subcategory);

	virtual Size2 get_minimum_size() const;
	void edit(VisualShader *p_visual_shader);
	VisualShaderEditor();
};

class VisualShaderEditorPlugin : public EditorPlugin {

	GDCLASS(VisualShaderEditorPlugin, EditorPlugin);

	VisualShaderEditor *visual_shader_editor;
	EditorNode *editor;
	Button *button;

public:
	virtual String get_name() const { return "VisualShader"; }
	bool has_main_screen() const { return false; }
	virtual void edit(Object *p_object);
	virtual bool handles(Object *p_object) const;
	virtual void make_visible(bool p_visible);

	VisualShaderEditorPlugin(EditorNode *p_node);
	~VisualShaderEditorPlugin();
};

class VisualShaderNodePluginDefault : public VisualShaderNodePlugin {

	GDCLASS(VisualShaderNodePluginDefault, VisualShaderNodePlugin);

public:
	virtual Control *create_editor(const Ref<Resource> &p_parent_resource, const Ref<VisualShaderNode> &p_node);
};

class EditorPropertyShaderMode : public EditorProperty {
	GDCLASS(EditorPropertyShaderMode, EditorProperty);
	OptionButton *options;

	void _option_selected(int p_which);

protected:
	static void _bind_methods();

public:
	void setup(const Vector<String> &p_options);
	virtual void update_property();
	void set_option_button_clip(bool p_enable);
	EditorPropertyShaderMode();
};

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

public:
	virtual bool can_handle(Object *p_object);
	virtual void parse_begin(Object *p_object);
	virtual bool parse_property(Object *p_object, Variant::Type p_type, const String &p_path, PropertyHint p_hint, const String &p_hint_text, int p_usage);
	virtual void parse_end();
};

class VisualShaderNodePortPreview : public Control {
	GDCLASS(VisualShaderNodePortPreview, Control);
	Ref<VisualShader> shader;
	VisualShader::Type type;
	int node;
	int port;
	void _shader_changed(); //must regen
protected:
	void _notification(int p_what);
	static void _bind_methods();

public:
	virtual Size2 get_minimum_size() const;
	void setup(const Ref<VisualShader> &p_shader, VisualShader::Type p_type, int p_node, int p_port);
	VisualShaderNodePortPreview();
};

class VisualShaderConversionPlugin : public EditorResourceConversionPlugin {
	GDCLASS(VisualShaderConversionPlugin, EditorResourceConversionPlugin);

public:
	virtual String converts_to() const;
	virtual bool handles(const Ref<Resource> &p_resource) const;
	virtual Ref<Resource> convert(const Ref<Resource> &p_resource) const;
};

#endif // VISUAL_SHADER_EDITOR_PLUGIN_H
