/**************************************************************************/
/*  editor_properties_vector.cpp                                          */
/**************************************************************************/
/*                         This file is part of:                          */
/*                             GODOT ENGINE                               */
/*                        https://godotengine.org                         */
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/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
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/* Permission is hereby granted, free of charge, to any person obtaining  */
/* a copy of this software and associated documentation files (the        */
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#include "editor_properties_vector.h"

#include "editor/editor_settings.h"
#include "editor/gui/editor_spin_slider.h"
#include "scene/gui/box_container.h"
#include "scene/gui/texture_button.h"

const String EditorPropertyVectorN::COMPONENT_LABELS[4] = { "x", "y", "z", "w" };

int EditorPropertyVectorN::_get_ratio_component(int p_idx, int p_component) const {
	int i = p_idx / (component_count - 1);
	if (p_component == 1) {
		return i;
	} else {
		return (i + p_idx % (component_count - 1) + 1) % component_count;
	}
}

void EditorPropertyVectorN::_set_read_only(bool p_read_only) {
	for (EditorSpinSlider *spin : spin_sliders) {
		spin->set_read_only(p_read_only);
	}
}

void EditorPropertyVectorN::_value_changed(double val, const String &p_name) {
	if (linked->is_pressed()) {
		// TODO: The logic here can be simplified. _get_ratio_component() only exists,
		// because the exact code was difficult to figure out.
		for (int i = 0; i < component_count; i++) {
			if (p_name == COMPONENT_LABELS[i]) {
				for (int j = 0; j < ratio.size(); j++) {
					if (_get_ratio_component(j, 1) == i) {
						for (int k = 0; k < component_count - 1; k++) {
							spin_sliders[_get_ratio_component(j + k, 0)]->set_value_no_signal(spin_sliders[_get_ratio_component(j + k, 1)]->get_value() * ratio[j + k]);
						}
						break;
					}
				}
				break;
			}
		}
	}

	Variant v;
	Callable::CallError cerror;
	Variant::construct(vector_type, v, nullptr, 0, cerror);

	for (int i = 0; i < component_count; i++) {
		if (angle_in_radians) {
			v.set(i, Math::deg_to_rad(spin_sliders[i]->get_value()));
		} else {
			v.set(i, spin_sliders[i]->get_value());
		}
	}
	emit_changed(get_edited_property(), v, linked->is_pressed() ? "" : p_name);
}

void EditorPropertyVectorN::update_property() {
	Variant val = get_edited_property_value();
	for (int i = 0; i < component_count; i++) {
		if (angle_in_radians) {
			spin_sliders[i]->set_value_no_signal(Math::rad_to_deg((real_t)val.get(i)));
		} else {
			spin_sliders[i]->set_value_no_signal(val.get(i));
		}
	}
	_update_ratio();
}

void EditorPropertyVectorN::_update_ratio() {
	linked->set_modulate(Color(1, 1, 1, linked->is_pressed() ? 1.0 : 0.5));

	bool non_zero = true;
	for (int i = 0; i < component_count; i++) {
		if (spin_sliders[i]->get_value() == 0) {
			non_zero = false;
			break;
		}
	}

	double *ratio_write = ratio.ptrw();
	for (int i = 0; i < ratio.size(); i++) {
		if (non_zero) {
			ratio_write[i] = spin_sliders[_get_ratio_component(i, 0)]->get_value() / spin_sliders[_get_ratio_component(i, 1)]->get_value();
		} else {
			ratio_write[i] = 1.0;
		}
	}
}

void EditorPropertyVectorN::_store_link(bool p_linked) {
	if (!get_edited_object()) {
		return;
	}
	const String key = vformat("%s:%s", get_edited_object()->get_class(), get_edited_property());
	EditorSettings::get_singleton()->set_project_metadata("linked_properties", key, p_linked);
}

void EditorPropertyVectorN::_notification(int p_what) {
	switch (p_what) {
		case NOTIFICATION_READY: {
			if (linked->is_visible()) {
				const String key = vformat("%s:%s", get_edited_object()->get_class(), get_edited_property());
				linked->set_pressed(EditorSettings::get_singleton()->get_project_metadata("linked_properties", key, true));
			}
		} break;

		case NOTIFICATION_THEME_CHANGED: {
			linked->set_texture_normal(get_theme_icon(SNAME("Unlinked"), SNAME("EditorIcons")));
			linked->set_texture_pressed(get_theme_icon(SNAME("Instance"), SNAME("EditorIcons")));

			const Color *colors = _get_property_colors();
			for (int i = 0; i < component_count; i++) {
				spin_sliders[i]->add_theme_color_override("label_color", colors[i]);
			}
		} break;
	}
}

void EditorPropertyVectorN::setup(double p_min, double p_max, double p_step, bool p_hide_slider, bool p_link, const String &p_suffix, bool p_angle_in_radians) {
	angle_in_radians = p_angle_in_radians;

	for (EditorSpinSlider *spin : spin_sliders) {
		spin->set_min(p_min);
		spin->set_max(p_max);
		spin->set_step(p_step);
		spin->set_hide_slider(p_hide_slider);
		spin->set_allow_greater(true);
		spin->set_allow_lesser(true);
		spin->set_suffix(p_suffix);
	}

	if (!p_link) {
		linked->hide();
	}
}

EditorPropertyVectorN::EditorPropertyVectorN(Variant::Type p_type, bool p_force_wide, bool p_horizontal) {
	vector_type = p_type;
	switch (vector_type) {
		case Variant::VECTOR2:
		case Variant::VECTOR2I:
			component_count = 2;
			break;

		case Variant::VECTOR3:
		case Variant::VECTOR3I:
			component_count = 3;
			break;

		case Variant::VECTOR4:
		case Variant::VECTOR4I:
			component_count = 4;
			break;

		default: // Needed to silence a warning.
			ERR_PRINT("Not a Vector type.");
			break;
	}
	bool horizontal = p_force_wide || p_horizontal;

	HBoxContainer *hb = memnew(HBoxContainer);
	hb->set_h_size_flags(SIZE_EXPAND_FILL);

	BoxContainer *bc;

	if (p_force_wide) {
		bc = memnew(HBoxContainer);
		hb->add_child(bc);
	} else if (horizontal) {
		bc = memnew(HBoxContainer);
		hb->add_child(bc);
		set_bottom_editor(hb);
	} else {
		bc = memnew(VBoxContainer);
		hb->add_child(bc);
	}
	bc->set_h_size_flags(SIZE_EXPAND_FILL);

	spin_sliders.resize(component_count);
	EditorSpinSlider **spin = spin_sliders.ptrw();

	for (int i = 0; i < component_count; i++) {
		spin[i] = memnew(EditorSpinSlider);
		spin[i]->set_flat(true);
		spin[i]->set_label(String(COMPONENT_LABELS[i]));
		bc->add_child(spin[i]);
		add_focusable(spin[i]);
		spin[i]->connect("value_changed", callable_mp(this, &EditorPropertyVectorN::_value_changed).bind(String(COMPONENT_LABELS[i])));
		if (horizontal) {
			spin[i]->set_h_size_flags(SIZE_EXPAND_FILL);
		}
	}

	ratio.resize(component_count * (component_count - 1));
	ratio.fill(1.0);

	linked = memnew(TextureButton);
	linked->set_toggle_mode(true);
	linked->set_stretch_mode(TextureButton::STRETCH_KEEP_CENTERED);
	linked->set_tooltip_text(TTR("Lock/Unlock Component Ratio"));
	linked->connect(SNAME("pressed"), callable_mp(this, &EditorPropertyVectorN::_update_ratio));
	linked->connect(SNAME("toggled"), callable_mp(this, &EditorPropertyVectorN::_store_link));
	hb->add_child(linked);

	add_child(hb);
	if (!horizontal) {
		set_label_reference(spin_sliders[0]); // Show text and buttons around this.
	}
}

EditorPropertyVector2::EditorPropertyVector2(bool p_force_wide) :
		EditorPropertyVectorN(Variant::VECTOR2, p_force_wide, EDITOR_GET("interface/inspector/horizontal_vector2_editing")) {}

EditorPropertyVector2i::EditorPropertyVector2i(bool p_force_wide) :
		EditorPropertyVectorN(Variant::VECTOR2I, p_force_wide, EDITOR_GET("interface/inspector/horizontal_vector2_editing")) {}

EditorPropertyVector3::EditorPropertyVector3(bool p_force_wide) :
		EditorPropertyVectorN(Variant::VECTOR3, p_force_wide, EDITOR_GET("interface/inspector/horizontal_vector_types_editing")) {}

EditorPropertyVector3i::EditorPropertyVector3i(bool p_force_wide) :
		EditorPropertyVectorN(Variant::VECTOR3I, p_force_wide, EDITOR_GET("interface/inspector/horizontal_vector_types_editing")) {}

EditorPropertyVector4::EditorPropertyVector4(bool p_force_wide) :
		EditorPropertyVectorN(Variant::VECTOR4, p_force_wide, EDITOR_GET("interface/inspector/horizontal_vector_types_editing")) {}

EditorPropertyVector4i::EditorPropertyVector4i(bool p_force_wide) :
		EditorPropertyVectorN(Variant::VECTOR4I, p_force_wide, EDITOR_GET("interface/inspector/horizontal_vector_types_editing")) {}