/*************************************************************************/
/*  editor_audio_buses.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 EDITORAUDIOBUSES_H
#define EDITORAUDIOBUSES_H

#include "editor/editor_plugin.h"
#include "scene/gui/box_container.h"
#include "scene/gui/button.h"
#include "scene/gui/control.h"
#include "scene/gui/line_edit.h"
#include "scene/gui/menu_button.h"
#include "scene/gui/option_button.h"
#include "scene/gui/panel.h"
#include "scene/gui/panel_container.h"
#include "scene/gui/scroll_container.h"
#include "scene/gui/slider.h"
#include "scene/gui/texture_progress_bar.h"
#include "scene/gui/texture_rect.h"
#include "scene/gui/tree.h"

class EditorAudioBuses;

class EditorAudioBus : public PanelContainer {
	GDCLASS(EditorAudioBus, PanelContainer);

	Ref<Texture2D> disabled_vu;
	LineEdit *track_name = nullptr;
	MenuButton *bus_options = nullptr;
	VSlider *slider = nullptr;

	int cc;
	static const int CHANNELS_MAX = 4;

	struct {
		bool prev_active = false;

		float peak_l = 0;
		float peak_r = 0;

		TextureProgressBar *vu_l = nullptr;
		TextureProgressBar *vu_r = nullptr;
	} channel[CHANNELS_MAX];

	OptionButton *send = nullptr;

	PopupMenu *effect_options = nullptr;
	PopupMenu *bus_popup = nullptr;
	PopupMenu *delete_effect_popup = nullptr;

	Panel *audio_value_preview_box = nullptr;
	Label *audio_value_preview_label = nullptr;
	Timer *preview_timer = nullptr;

	Button *solo = nullptr;
	Button *mute = nullptr;
	Button *bypass = nullptr;

	Tree *effects = nullptr;

	bool updating_bus = false;
	bool is_master;
	mutable bool hovering_drop = false;

	virtual void gui_input(const Ref<InputEvent> &p_event) override;
	void _effects_gui_input(Ref<InputEvent> p_event);
	void _bus_popup_pressed(int p_option);

	void _name_changed(const String &p_new_name);
	void _name_focus_exit() { _name_changed(track_name->get_text()); }
	void _volume_changed(float p_normalized);
	float _normalized_volume_to_scaled_db(float normalized);
	float _scaled_db_to_normalized_volume(float db);
	void _show_value(float slider_value);
	void _hide_value_preview();
	void _solo_toggled();
	void _mute_toggled();
	void _bypass_toggled();
	void _send_selected(int p_which);
	void _effect_edited();
	void _effect_add(int p_which);
	void _effect_selected();
	void _delete_effect_pressed(int p_option);
	void _effect_rmb(const Vector2 &p_pos);
	void _update_visible_channels();

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

	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);

	friend class EditorAudioBuses;

	EditorAudioBuses *buses = nullptr;

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

public:
	void update_bus();
	void update_send();

	EditorAudioBus(EditorAudioBuses *p_buses = nullptr, bool p_is_master = false);
};

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

	virtual bool can_drop_data(const Point2 &p_point, const Variant &p_data) const override;
	virtual void drop_data(const Point2 &p_point, const Variant &p_data) override;

	mutable bool hovering_drop = false;

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

public:
	EditorAudioBusDrop();
};

class EditorAudioBuses : public VBoxContainer {
	GDCLASS(EditorAudioBuses, VBoxContainer);

	HBoxContainer *top_hb = nullptr;

	ScrollContainer *bus_scroll = nullptr;
	HBoxContainer *bus_hb = nullptr;

	EditorAudioBusDrop *drop_end = nullptr;

	Label *file = nullptr;

	Button *add = nullptr;
	Button *load = nullptr;
	Button *save_as = nullptr;
	Button *_default = nullptr;
	Button *_new = nullptr;

	Timer *save_timer = nullptr;
	String edited_path;

	void _add_bus();
	void _update_buses();
	void _update_bus(int p_index);
	void _update_sends();

	void _delete_bus(Object *p_which);
	void _duplicate_bus(int p_which);
	void _reset_bus_volume(Object *p_which);

	void _request_drop_end();
	void _drop_at_index(int p_bus, int p_index);

	void _server_save();

	void _select_layout();
	void _load_layout();
	void _save_as_layout();
	void _load_default_layout();
	void _new_layout();

	EditorFileDialog *file_dialog = nullptr;
	bool new_layout;

	void _file_dialog_callback(const String &p_string);

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

public:
	void open_layout(const String &p_path);

	static EditorAudioBuses *register_editor();

	EditorAudioBuses();
};

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

private:
	struct AudioNotch {
		float relative_position = 0;
		float db_value = 0;
		bool render_db_value = false;

		_FORCE_INLINE_ AudioNotch(float r_pos, float db_v, bool rndr_val) {
			relative_position = r_pos;
			db_value = db_v;
			render_db_value = rndr_val;
		}

		_FORCE_INLINE_ AudioNotch(const AudioNotch &n) {
			relative_position = n.relative_position;
			db_value = n.db_value;
			render_db_value = n.render_db_value;
		}

		_FORCE_INLINE_ void operator=(const EditorAudioMeterNotches::AudioNotch &n) {
			relative_position = n.relative_position;
			db_value = n.db_value;
			render_db_value = n.render_db_value;
		}

		_FORCE_INLINE_ AudioNotch() {}
	};

	List<AudioNotch> notches;

public:
	const float line_length = 5.0f;
	const float label_space = 2.0f;
	const float btm_padding = 9.0f;
	const float top_padding = 5.0f;
	Color notch_color;

	void add_notch(float p_normalized_offset, float p_db_value, bool p_render_value = false);
	Size2 get_minimum_size() const override;

private:
	static void _bind_methods();
	void _notification(int p_what);
	void _draw_audio_notches();

public:
	EditorAudioMeterNotches();
};

class AudioBusesEditorPlugin : public EditorPlugin {
	GDCLASS(AudioBusesEditorPlugin, EditorPlugin);

	EditorAudioBuses *audio_bus_editor = nullptr;

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

	AudioBusesEditorPlugin(EditorAudioBuses *p_node);
	~AudioBusesEditorPlugin();
};

#endif // EDITORAUDIOBUSES_H