/**************************************************************************/
/*  editor_audio_buses.h                                                  */
/**************************************************************************/
/*                         This file is part of:                          */
/*                             GODOT ENGINE                               */
/*                        https://godotengine.org                         */
/**************************************************************************/
/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 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,   */
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/**************************************************************************/

#pragma once

#include "editor/docks/editor_dock.h"
#include "editor/plugins/editor_plugin.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/tree.h"

class EditorAudioBuses;
class EditorFileDialog;
class Gradient;
class GradientTexture2D;
class HBoxContainer;
class StyleBoxFlat;
class Timer;

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

	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;
		float peak_r;

		TextureProgressBar *vu_l = nullptr;
		TextureProgressBar *vu_r = nullptr;

		Panel *peak_indicator_l = nullptr;
		Panel *peak_indicator_r = nullptr;
		Timer *peak_timer_l = nullptr;
		Timer *peak_timer_r = nullptr;

		bool indicator_fall_l = false;
		bool indicator_fall_r = false;
	} channel[CHANNELS_MAX];

	// Divides positive and negative dB values.
	const PackedFloat32Array gradient_offsets = { 0.0, 0.72, 0.74 };
	PackedColorArray active_gradient_colors;
	PackedColorArray inactive_gradient_colors;
	Color under_tint_color;
	Color over_tint_color;

	Ref<GradientTexture2D> active_bus_texture;
	Ref<Gradient> active_gradient;
	Ref<GradientTexture2D> inactive_bus_texture;
	Ref<Gradient> inactive_gradient;

	Ref<StyleBoxFlat> peak_indicator_stylebox_l;
	Ref<StyleBoxFlat> peak_indicator_stylebox_r;

	const float vu_width = 16;
	const float vu_height = 128;
	float peak_indicator_range;

	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 _enable_indicator_fall();
	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, MouseButton p_button);
	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);
};

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

	HBoxContainer *top_hb = nullptr;

	MarginContainer *bus_mc = 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;

	bool floating = false;

	void _update_file_label();
	void _update_file_label_size();

	void _rebuild_buses();
	void _update_bus(int p_index);
	void _update_sends();

	void _add_bus();
	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 _file_moved(const String &p_old_path, const String &p_new_path);

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

	EditorFileDialog *file_dialog = nullptr;
	bool new_layout = false;

	void _file_dialog_callback(const String &p_string);

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

	virtual void update_layout(EditorDock::DockLayout p_layout) override;

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;

	struct ThemeCache {
		Color notch_color;

		Ref<Font> font;
		int font_size = 0;
	} theme_cache;

public:
	const float line_length = 5.0f;
	const float label_space = 2.0f;

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

private:
	virtual void _update_theme_item_cache() override;

	static void _bind_methods();
	void _notification(int p_what);
	void _draw_audio_notches();
};

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

	EditorAudioBuses *audio_bus_editor = nullptr;

public:
	virtual String get_plugin_name() const override { return "SampleLibrary"; }
	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);
};
