/*************************************************************************/
/*  audio_stream_editor_plugin.cpp                                       */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                      https://godotengine.org                          */
/*************************************************************************/
/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md).   */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* "Software"), to deal in the Software without restriction, including   */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* The above copyright notice and this permission notice shall be        */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
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/*************************************************************************/

#include "audio_stream_editor_plugin.h"

#include "core/config/project_settings.h"
#include "core/io/resource_loader.h"
#include "core/os/keyboard.h"
#include "editor/audio_stream_preview.h"
#include "editor/editor_scale.h"
#include "editor/editor_settings.h"

void AudioStreamEditor::_notification(int p_what) {
	if (p_what == NOTIFICATION_READY) {
		AudioStreamPreviewGenerator::get_singleton()->connect("preview_updated", callable_mp(this, &AudioStreamEditor::_preview_changed));
	}

	if (p_what == NOTIFICATION_THEME_CHANGED || p_what == NOTIFICATION_ENTER_TREE) {
		_play_button->set_icon(get_theme_icon(SNAME("MainPlay"), SNAME("EditorIcons")));
		_stop_button->set_icon(get_theme_icon(SNAME("Stop"), SNAME("EditorIcons")));
		_preview->set_color(get_theme_color(SNAME("dark_color_2"), SNAME("Editor")));
		set_color(get_theme_color(SNAME("dark_color_1"), SNAME("Editor")));

		_indicator->update();
		_preview->update();
	}

	if (p_what == NOTIFICATION_PROCESS) {
		_current = _player->get_playback_position();
		_indicator->update();
	}

	if (p_what == NOTIFICATION_VISIBILITY_CHANGED) {
		if (!is_visible_in_tree()) {
			_stop();
		}
	}
}

void AudioStreamEditor::_draw_preview() {
	Rect2 rect = _preview->get_rect();
	Size2 size = get_size();

	Ref<AudioStreamPreview> preview = AudioStreamPreviewGenerator::get_singleton()->generate_preview(stream);
	float preview_len = preview->get_length();

	Vector<Vector2> lines;
	lines.resize(size.width * 2);

	for (int i = 0; i < size.width; i++) {
		float ofs = i * preview_len / size.width;
		float ofs_n = (i + 1) * preview_len / size.width;
		float max = preview->get_max(ofs, ofs_n) * 0.5 + 0.5;
		float min = preview->get_min(ofs, ofs_n) * 0.5 + 0.5;

		int idx = i;
		lines.write[idx * 2 + 0] = Vector2(i + 1, rect.position.y + min * rect.size.y);
		lines.write[idx * 2 + 1] = Vector2(i + 1, rect.position.y + max * rect.size.y);
	}

	Vector<Color> color;
	color.push_back(get_theme_color(SNAME("contrast_color_2"), SNAME("Editor")));

	RS::get_singleton()->canvas_item_add_multiline(_preview->get_canvas_item(), lines, color);
}

void AudioStreamEditor::_preview_changed(ObjectID p_which) {
	if (stream.is_valid() && stream->get_instance_id() == p_which) {
		_preview->update();
	}
}

void AudioStreamEditor::_audio_changed() {
	if (!is_visible()) {
		return;
	}
	update();
}

void AudioStreamEditor::_play() {
	if (_player->is_playing()) {
		// '_pausing' variable indicates that we want to pause the audio player, not stop it. See '_on_finished()'.
		_pausing = true;
		_player->stop();
		_play_button->set_icon(get_theme_icon(SNAME("MainPlay"), SNAME("EditorIcons")));
		set_process(false);
	} else {
		_player->play(_current);
		_play_button->set_icon(get_theme_icon(SNAME("Pause"), SNAME("EditorIcons")));
		set_process(true);
	}
}

void AudioStreamEditor::_stop() {
	_player->stop();
	_play_button->set_icon(get_theme_icon(SNAME("MainPlay"), SNAME("EditorIcons")));
	_current = 0;
	_indicator->update();
	set_process(false);
}

void AudioStreamEditor::_on_finished() {
	_play_button->set_icon(get_theme_icon(SNAME("MainPlay"), SNAME("EditorIcons")));
	if (!_pausing) {
		_current = 0;
		_indicator->update();
	} else {
		_pausing = false;
	}
	set_process(false);
}

void AudioStreamEditor::_draw_indicator() {
	if (!stream.is_valid()) {
		return;
	}

	Rect2 rect = _preview->get_rect();
	float len = stream->get_length();
	float ofs_x = _current / len * rect.size.width;
	const Color color = get_theme_color(SNAME("accent_color"), SNAME("Editor"));
	_indicator->draw_line(Point2(ofs_x, 0), Point2(ofs_x, rect.size.height), color, Math::round(2 * EDSCALE));
	_indicator->draw_texture(
			get_theme_icon(SNAME("TimelineIndicator"), SNAME("EditorIcons")),
			Point2(ofs_x - get_theme_icon(SNAME("TimelineIndicator"), SNAME("EditorIcons"))->get_width() * 0.5, 0),
			color);

	_current_label->set_text(String::num(_current, 2).pad_decimals(2) + " /");
}

void AudioStreamEditor::_on_input_indicator(Ref<InputEvent> p_event) {
	const Ref<InputEventMouseButton> mb = p_event;
	if (mb.is_valid() && mb->get_button_index() == MouseButton::LEFT) {
		if (mb->is_pressed()) {
			_seek_to(mb->get_position().x);
		}
		_dragging = mb->is_pressed();
	}

	const Ref<InputEventMouseMotion> mm = p_event;
	if (mm.is_valid()) {
		if (_dragging) {
			_seek_to(mm->get_position().x);
		}
	}
}

void AudioStreamEditor::_seek_to(real_t p_x) {
	_current = p_x / _preview->get_rect().size.x * stream->get_length();
	_current = CLAMP(_current, 0, stream->get_length());
	_player->seek(_current);
	_indicator->update();
}

void AudioStreamEditor::edit(Ref<AudioStream> p_stream) {
	if (!stream.is_null()) {
		stream->disconnect("changed", callable_mp(this, &AudioStreamEditor::_audio_changed));
	}

	stream = p_stream;
	_player->set_stream(stream);
	_current = 0;
	String text = String::num(stream->get_length(), 2).pad_decimals(2) + "s";
	_duration_label->set_text(text);

	if (!stream.is_null()) {
		stream->connect("changed", callable_mp(this, &AudioStreamEditor::_audio_changed));
		update();
	} else {
		hide();
	}
}

void AudioStreamEditor::_bind_methods() {
}

AudioStreamEditor::AudioStreamEditor() {
	set_custom_minimum_size(Size2(1, 100) * EDSCALE);

	_player = memnew(AudioStreamPlayer);
	_player->connect("finished", callable_mp(this, &AudioStreamEditor::_on_finished));
	add_child(_player);

	VBoxContainer *vbox = memnew(VBoxContainer);
	vbox->set_anchors_and_offsets_preset(PRESET_WIDE, PRESET_MODE_MINSIZE, 0);
	add_child(vbox);

	_preview = memnew(ColorRect);
	_preview->set_v_size_flags(SIZE_EXPAND_FILL);
	_preview->connect("draw", callable_mp(this, &AudioStreamEditor::_draw_preview));
	vbox->add_child(_preview);

	_indicator = memnew(Control);
	_indicator->set_anchors_and_offsets_preset(PRESET_WIDE);
	_indicator->connect("draw", callable_mp(this, &AudioStreamEditor::_draw_indicator));
	_indicator->connect("gui_input", callable_mp(this, &AudioStreamEditor::_on_input_indicator));
	_preview->add_child(_indicator);

	HBoxContainer *hbox = memnew(HBoxContainer);
	hbox->add_theme_constant_override("separation", 0);
	vbox->add_child(hbox);

	_play_button = memnew(Button);
	_play_button->set_flat(true);
	hbox->add_child(_play_button);
	_play_button->set_focus_mode(Control::FOCUS_NONE);
	_play_button->connect("pressed", callable_mp(this, &AudioStreamEditor::_play));
	_play_button->set_shortcut(ED_SHORTCUT("inspector/audio_preview_play_pause", TTR("Audio Preview Play/Pause"), Key::SPACE));

	_stop_button = memnew(Button);
	_stop_button->set_flat(true);
	hbox->add_child(_stop_button);
	_stop_button->set_focus_mode(Control::FOCUS_NONE);
	_stop_button->connect("pressed", callable_mp(this, &AudioStreamEditor::_stop));

	_current_label = memnew(Label);
	_current_label->set_horizontal_alignment(HORIZONTAL_ALIGNMENT_RIGHT);
	_current_label->set_h_size_flags(SIZE_EXPAND_FILL);
	_current_label->add_theme_font_override("font", EditorNode::get_singleton()->get_gui_base()->get_theme_font(SNAME("status_source"), SNAME("EditorFonts")));
	_current_label->add_theme_font_size_override("font_size", EditorNode::get_singleton()->get_gui_base()->get_theme_font_size(SNAME("status_source_size"), SNAME("EditorFonts")));
	_current_label->set_modulate(Color(1, 1, 1, 0.5));
	hbox->add_child(_current_label);

	_duration_label = memnew(Label);
	_duration_label->add_theme_font_override("font", EditorNode::get_singleton()->get_gui_base()->get_theme_font(SNAME("status_source"), SNAME("EditorFonts")));
	_duration_label->add_theme_font_size_override("font_size", EditorNode::get_singleton()->get_gui_base()->get_theme_font_size(SNAME("status_source_size"), SNAME("EditorFonts")));
	hbox->add_child(_duration_label);
}

void AudioStreamEditorPlugin::edit(Object *p_object) {
	AudioStream *s = Object::cast_to<AudioStream>(p_object);
	if (!s) {
		return;
	}

	audio_editor->edit(Ref<AudioStream>(s));
}

bool AudioStreamEditorPlugin::handles(Object *p_object) const {
	return p_object->is_class("AudioStream");
}

void AudioStreamEditorPlugin::make_visible(bool p_visible) {
	audio_editor->set_visible(p_visible);
}

AudioStreamEditorPlugin::AudioStreamEditorPlugin(EditorNode *p_node) {
	editor = p_node;
	audio_editor = memnew(AudioStreamEditor);
	add_control_to_container(CONTAINER_PROPERTY_EDITOR_BOTTOM, audio_editor);
	audio_editor->hide();
}

AudioStreamEditorPlugin::~AudioStreamEditorPlugin() {
}