/*************************************************************************/
/*  light_2d.cpp                                                         */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                      https://godotengine.org                          */
/*************************************************************************/
/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md).   */
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/* "Software"), to deal in the Software without restriction, including   */
/* without limitation the rights to use, copy, modify, merge, publish,   */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* included in all copies or substantial portions of the Software.       */
/*                                                                       */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
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/*************************************************************************/

#include "light_2d.h"

#include "core/config/engine.h"
#include "servers/rendering_server.h"

void Light2D::_update_light_visibility() {
	if (!is_inside_tree()) {
		return;
	}

	bool editor_ok = true;

#ifdef TOOLS_ENABLED
	if (editor_only) {
		if (!Engine::get_singleton()->is_editor_hint()) {
			editor_ok = false;
		} else {
			editor_ok = (get_tree()->get_edited_scene_root() && (this == get_tree()->get_edited_scene_root() || get_owner() == get_tree()->get_edited_scene_root()));
		}
	}
#else
	if (editor_only) {
		editor_ok = false;
	}
#endif

	RS::get_singleton()->canvas_light_set_enabled(canvas_light, enabled && is_visible_in_tree() && editor_ok);
}

void Light2D::set_enabled(bool p_enabled) {
	enabled = p_enabled;
	_update_light_visibility();
}

bool Light2D::is_enabled() const {
	return enabled;
}

void Light2D::set_editor_only(bool p_editor_only) {
	editor_only = p_editor_only;
	_update_light_visibility();
}

bool Light2D::is_editor_only() const {
	return editor_only;
}

void Light2D::set_color(const Color &p_color) {
	color = p_color;
	RS::get_singleton()->canvas_light_set_color(canvas_light, color);
}

Color Light2D::get_color() const {
	return color;
}

void Light2D::set_height(float p_height) {
	height = p_height;
	RS::get_singleton()->canvas_light_set_height(canvas_light, height);
}

float Light2D::get_height() const {
	return height;
}

void Light2D::set_energy(float p_energy) {
	energy = p_energy;
	RS::get_singleton()->canvas_light_set_energy(canvas_light, energy);
}

float Light2D::get_energy() const {
	return energy;
}

void Light2D::set_z_range_min(int p_min_z) {
	z_min = p_min_z;
	RS::get_singleton()->canvas_light_set_z_range(canvas_light, z_min, z_max);
}

int Light2D::get_z_range_min() const {
	return z_min;
}

void Light2D::set_z_range_max(int p_max_z) {
	z_max = p_max_z;
	RS::get_singleton()->canvas_light_set_z_range(canvas_light, z_min, z_max);
}

int Light2D::get_z_range_max() const {
	return z_max;
}

void Light2D::set_layer_range_min(int p_min_layer) {
	layer_min = p_min_layer;
	RS::get_singleton()->canvas_light_set_layer_range(canvas_light, layer_min, layer_max);
}

int Light2D::get_layer_range_min() const {
	return layer_min;
}

void Light2D::set_layer_range_max(int p_max_layer) {
	layer_max = p_max_layer;
	RS::get_singleton()->canvas_light_set_layer_range(canvas_light, layer_min, layer_max);
}

int Light2D::get_layer_range_max() const {
	return layer_max;
}

void Light2D::set_item_cull_mask(int p_mask) {
	item_mask = p_mask;
	RS::get_singleton()->canvas_light_set_item_cull_mask(canvas_light, item_mask);
}

int Light2D::get_item_cull_mask() const {
	return item_mask;
}

void Light2D::set_item_shadow_cull_mask(int p_mask) {
	item_shadow_mask = p_mask;
	RS::get_singleton()->canvas_light_set_item_shadow_cull_mask(canvas_light, item_shadow_mask);
}

int Light2D::get_item_shadow_cull_mask() const {
	return item_shadow_mask;
}

void Light2D::set_shadow_enabled(bool p_enabled) {
	shadow = p_enabled;
	RS::get_singleton()->canvas_light_set_shadow_enabled(canvas_light, shadow);
}

bool Light2D::is_shadow_enabled() const {
	return shadow;
}

void Light2D::set_shadow_filter(ShadowFilter p_filter) {
	ERR_FAIL_INDEX(p_filter, SHADOW_FILTER_MAX);
	shadow_filter = p_filter;
	RS::get_singleton()->canvas_light_set_shadow_filter(canvas_light, RS::CanvasLightShadowFilter(p_filter));
}

Light2D::ShadowFilter Light2D::get_shadow_filter() const {
	return shadow_filter;
}

void Light2D::set_shadow_color(const Color &p_shadow_color) {
	shadow_color = p_shadow_color;
	RS::get_singleton()->canvas_light_set_shadow_color(canvas_light, shadow_color);
}

Color Light2D::get_shadow_color() const {
	return shadow_color;
}

void Light2D::set_blend_mode(BlendMode p_mode) {
	blend_mode = p_mode;
	RS::get_singleton()->canvas_light_set_blend_mode(_get_light(), RS::CanvasLightBlendMode(p_mode));
}

Light2D::BlendMode Light2D::get_blend_mode() const {
	return blend_mode;
}

void Light2D::_notification(int p_what) {
	if (p_what == NOTIFICATION_ENTER_TREE) {
		RS::get_singleton()->canvas_light_attach_to_canvas(canvas_light, get_canvas());
		_update_light_visibility();
	}

	if (p_what == NOTIFICATION_TRANSFORM_CHANGED) {
		RS::get_singleton()->canvas_light_set_transform(canvas_light, get_global_transform());
	}
	if (p_what == NOTIFICATION_VISIBILITY_CHANGED) {
		_update_light_visibility();
	}

	if (p_what == NOTIFICATION_EXIT_TREE) {
		RS::get_singleton()->canvas_light_attach_to_canvas(canvas_light, RID());
		_update_light_visibility();
	}
}

void Light2D::set_shadow_smooth(float p_amount) {
	shadow_smooth = p_amount;
	RS::get_singleton()->canvas_light_set_shadow_smooth(canvas_light, shadow_smooth);
}

float Light2D::get_shadow_smooth() const {
	return shadow_smooth;
}

void Light2D::_bind_methods() {
	ClassDB::bind_method(D_METHOD("set_enabled", "enabled"), &Light2D::set_enabled);
	ClassDB::bind_method(D_METHOD("is_enabled"), &Light2D::is_enabled);

	ClassDB::bind_method(D_METHOD("set_editor_only", "editor_only"), &Light2D::set_editor_only);
	ClassDB::bind_method(D_METHOD("is_editor_only"), &Light2D::is_editor_only);

	ClassDB::bind_method(D_METHOD("set_color", "color"), &Light2D::set_color);
	ClassDB::bind_method(D_METHOD("get_color"), &Light2D::get_color);

	ClassDB::bind_method(D_METHOD("set_energy", "energy"), &Light2D::set_energy);
	ClassDB::bind_method(D_METHOD("get_energy"), &Light2D::get_energy);

	ClassDB::bind_method(D_METHOD("set_z_range_min", "z"), &Light2D::set_z_range_min);
	ClassDB::bind_method(D_METHOD("get_z_range_min"), &Light2D::get_z_range_min);

	ClassDB::bind_method(D_METHOD("set_z_range_max", "z"), &Light2D::set_z_range_max);
	ClassDB::bind_method(D_METHOD("get_z_range_max"), &Light2D::get_z_range_max);

	ClassDB::bind_method(D_METHOD("set_layer_range_min", "layer"), &Light2D::set_layer_range_min);
	ClassDB::bind_method(D_METHOD("get_layer_range_min"), &Light2D::get_layer_range_min);

	ClassDB::bind_method(D_METHOD("set_layer_range_max", "layer"), &Light2D::set_layer_range_max);
	ClassDB::bind_method(D_METHOD("get_layer_range_max"), &Light2D::get_layer_range_max);

	ClassDB::bind_method(D_METHOD("set_item_cull_mask", "item_cull_mask"), &Light2D::set_item_cull_mask);
	ClassDB::bind_method(D_METHOD("get_item_cull_mask"), &Light2D::get_item_cull_mask);

	ClassDB::bind_method(D_METHOD("set_item_shadow_cull_mask", "item_shadow_cull_mask"), &Light2D::set_item_shadow_cull_mask);
	ClassDB::bind_method(D_METHOD("get_item_shadow_cull_mask"), &Light2D::get_item_shadow_cull_mask);

	ClassDB::bind_method(D_METHOD("set_shadow_enabled", "enabled"), &Light2D::set_shadow_enabled);
	ClassDB::bind_method(D_METHOD("is_shadow_enabled"), &Light2D::is_shadow_enabled);

	ClassDB::bind_method(D_METHOD("set_shadow_smooth", "smooth"), &Light2D::set_shadow_smooth);
	ClassDB::bind_method(D_METHOD("get_shadow_smooth"), &Light2D::get_shadow_smooth);

	ClassDB::bind_method(D_METHOD("set_shadow_filter", "filter"), &Light2D::set_shadow_filter);
	ClassDB::bind_method(D_METHOD("get_shadow_filter"), &Light2D::get_shadow_filter);

	ClassDB::bind_method(D_METHOD("set_shadow_color", "shadow_color"), &Light2D::set_shadow_color);
	ClassDB::bind_method(D_METHOD("get_shadow_color"), &Light2D::get_shadow_color);

	ClassDB::bind_method(D_METHOD("set_blend_mode", "mode"), &Light2D::set_blend_mode);
	ClassDB::bind_method(D_METHOD("get_blend_mode"), &Light2D::get_blend_mode);

	ClassDB::bind_method(D_METHOD("set_height", "height"), &Light2D::set_height);
	ClassDB::bind_method(D_METHOD("get_height"), &Light2D::get_height);

	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "enabled"), "set_enabled", "is_enabled");
	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "editor_only"), "set_editor_only", "is_editor_only");
	ADD_PROPERTY(PropertyInfo(Variant::COLOR, "color"), "set_color", "get_color");
	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "energy", PROPERTY_HINT_RANGE, "0,16,0.01,or_greater"), "set_energy", "get_energy");
	ADD_PROPERTY(PropertyInfo(Variant::INT, "blend_mode", PROPERTY_HINT_ENUM, "Add,Sub,Mix"), "set_blend_mode", "get_blend_mode");
	ADD_GROUP("Range", "range_");
	ADD_PROPERTY(PropertyInfo(Variant::INT, "range_z_min", PROPERTY_HINT_RANGE, itos(RS::CANVAS_ITEM_Z_MIN) + "," + itos(RS::CANVAS_ITEM_Z_MAX) + ",1"), "set_z_range_min", "get_z_range_min");
	ADD_PROPERTY(PropertyInfo(Variant::INT, "range_z_max", PROPERTY_HINT_RANGE, itos(RS::CANVAS_ITEM_Z_MIN) + "," + itos(RS::CANVAS_ITEM_Z_MAX) + ",1"), "set_z_range_max", "get_z_range_max");
	ADD_PROPERTY(PropertyInfo(Variant::INT, "range_layer_min", PROPERTY_HINT_RANGE, "-512,512,1"), "set_layer_range_min", "get_layer_range_min");
	ADD_PROPERTY(PropertyInfo(Variant::INT, "range_layer_max", PROPERTY_HINT_RANGE, "-512,512,1"), "set_layer_range_max", "get_layer_range_max");
	ADD_PROPERTY(PropertyInfo(Variant::INT, "range_item_cull_mask", PROPERTY_HINT_LAYERS_2D_RENDER), "set_item_cull_mask", "get_item_cull_mask");

	ADD_GROUP("Shadow", "shadow_");
	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "shadow_enabled"), "set_shadow_enabled", "is_shadow_enabled");
	ADD_PROPERTY(PropertyInfo(Variant::COLOR, "shadow_color"), "set_shadow_color", "get_shadow_color");
	ADD_PROPERTY(PropertyInfo(Variant::INT, "shadow_filter", PROPERTY_HINT_ENUM, "None,PCF5,PCF13"), "set_shadow_filter", "get_shadow_filter");
	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "shadow_filter_smooth", PROPERTY_HINT_RANGE, "0,64,0.1"), "set_shadow_smooth", "get_shadow_smooth");
	ADD_PROPERTY(PropertyInfo(Variant::INT, "shadow_item_cull_mask", PROPERTY_HINT_LAYERS_2D_RENDER), "set_item_shadow_cull_mask", "get_item_shadow_cull_mask");

	BIND_ENUM_CONSTANT(SHADOW_FILTER_NONE);
	BIND_ENUM_CONSTANT(SHADOW_FILTER_PCF5);
	BIND_ENUM_CONSTANT(SHADOW_FILTER_PCF13);

	BIND_ENUM_CONSTANT(BLEND_MODE_ADD);
	BIND_ENUM_CONSTANT(BLEND_MODE_SUB);
	BIND_ENUM_CONSTANT(BLEND_MODE_MIX);
}

Light2D::Light2D() {
	canvas_light = RenderingServer::get_singleton()->canvas_light_create();
	enabled = true;
	editor_only = false;
	shadow = false;
	color = Color(1, 1, 1);
	height = 0;
	z_min = -1024;
	z_max = 1024;
	layer_min = 0;
	layer_max = 0;
	item_mask = 1;
	item_shadow_mask = 1;
	energy = 1.0;
	shadow_color = Color(0, 0, 0, 0);
	shadow_filter = SHADOW_FILTER_NONE;
	shadow_smooth = 0;
	blend_mode = BLEND_MODE_ADD;
	set_notify_transform(true);
}

Light2D::~Light2D() {
	RenderingServer::get_singleton()->free(canvas_light);
}

//////////////////////////////

#ifdef TOOLS_ENABLED

Dictionary PointLight2D::_edit_get_state() const {
	Dictionary state = Node2D::_edit_get_state();
	state["offset"] = get_texture_offset();
	return state;
}

void PointLight2D::_edit_set_state(const Dictionary &p_state) {
	Node2D::_edit_set_state(p_state);
	set_texture_offset(p_state["offset"]);
}

void PointLight2D::_edit_set_pivot(const Point2 &p_pivot) {
	set_position(get_transform().xform(p_pivot));
	set_texture_offset(get_texture_offset() - p_pivot);
}

Point2 PointLight2D::_edit_get_pivot() const {
	return Vector2();
}

bool PointLight2D::_edit_use_pivot() const {
	return true;
}

Rect2 PointLight2D::_edit_get_rect() const {
	if (texture.is_null()) {
		return Rect2();
	}

	Size2 s = texture->get_size() * _scale;
	return Rect2(texture_offset - s / 2.0, s);
}

bool PointLight2D::_edit_use_rect() const {
	return !texture.is_null();
}
#endif

Rect2 PointLight2D::get_anchorable_rect() const {
	if (texture.is_null()) {
		return Rect2();
	}

	Size2 s = texture->get_size() * _scale;
	return Rect2(texture_offset - s / 2.0, s);
}

void PointLight2D::set_texture(const Ref<Texture2D> &p_texture) {
	texture = p_texture;
	if (texture.is_valid()) {
		RS::get_singleton()->canvas_light_set_texture(_get_light(), texture->get_rid());
	} else {
		RS::get_singleton()->canvas_light_set_texture(_get_light(), RID());
	}

	update_configuration_warning();
}

Ref<Texture2D> PointLight2D::get_texture() const {
	return texture;
}

void PointLight2D::set_texture_offset(const Vector2 &p_offset) {
	texture_offset = p_offset;
	RS::get_singleton()->canvas_light_set_texture_offset(_get_light(), texture_offset);
	item_rect_changed();
	_change_notify("offset");
}

Vector2 PointLight2D::get_texture_offset() const {
	return texture_offset;
}

String PointLight2D::get_configuration_warning() const {
	String warning = Node2D::get_configuration_warning();

	if (!texture.is_valid()) {
		if (!warning.empty()) {
			warning += "\n\n";
		}
		warning += TTR("A texture with the shape of the light must be supplied to the \"Texture\" property.");
	}

	return warning;
}

void PointLight2D::set_texture_scale(float p_scale) {
	_scale = p_scale;
	// Avoid having 0 scale values, can lead to errors in physics and rendering.
	if (_scale == 0) {
		_scale = CMP_EPSILON;
	}
	RS::get_singleton()->canvas_light_set_texture_scale(_get_light(), _scale);
	item_rect_changed();
}

float PointLight2D::get_texture_scale() const {
	return _scale;
}

void PointLight2D::_bind_methods() {
	ClassDB::bind_method(D_METHOD("set_texture", "texture"), &PointLight2D::set_texture);
	ClassDB::bind_method(D_METHOD("get_texture"), &PointLight2D::get_texture);

	ClassDB::bind_method(D_METHOD("set_texture_offset", "texture_offset"), &PointLight2D::set_texture_offset);
	ClassDB::bind_method(D_METHOD("get_texture_offset"), &PointLight2D::get_texture_offset);

	ClassDB::bind_method(D_METHOD("set_texture_scale", "texture_scale"), &PointLight2D::set_texture_scale);
	ClassDB::bind_method(D_METHOD("get_texture_scale"), &PointLight2D::get_texture_scale);

	ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "texture", PROPERTY_HINT_RESOURCE_TYPE, "Texture2D"), "set_texture", "get_texture");
	ADD_PROPERTY(PropertyInfo(Variant::VECTOR2, "offset"), "set_texture_offset", "get_texture_offset");
	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "texture_scale", PROPERTY_HINT_RANGE, "0.01,50,0.01"), "set_texture_scale", "get_texture_scale");
	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "height", PROPERTY_HINT_RANGE, "0,1024,1,or_greater"), "set_height", "get_height");
}

PointLight2D::PointLight2D() {
	RS::get_singleton()->canvas_light_set_mode(_get_light(), RS::CANVAS_LIGHT_MODE_POINT);
}

//////////

void DirectionalLight2D::set_max_distance(float p_distance) {
	max_distance = p_distance;
	RS::get_singleton()->canvas_light_set_directional_distance(_get_light(), max_distance);
}

float DirectionalLight2D::get_max_distance() const {
	return max_distance;
}

void DirectionalLight2D::_bind_methods() {
	ClassDB::bind_method(D_METHOD("set_max_distance", "pixels"), &DirectionalLight2D::set_max_distance);
	ClassDB::bind_method(D_METHOD("get_max_distance"), &DirectionalLight2D::get_max_distance);

	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "height", PROPERTY_HINT_RANGE, "0,1,0.01"), "set_height", "get_height");
	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "max_distance", PROPERTY_HINT_RANGE, "0,16384.0,1.0,or_greater"), "set_max_distance", "get_max_distance");
}

DirectionalLight2D::DirectionalLight2D() {
	RS::get_singleton()->canvas_light_set_mode(_get_light(), RS::CANVAS_LIGHT_MODE_DIRECTIONAL);
	set_max_distance(max_distance); // Update RenderingServer.
}
