/*************************************************************************/
/*  canvas_layer.cpp                                                     */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                      https://godotengine.org                          */
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/* Copyright (c) 2007-2018 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2018 Godot Engine contributors (cf. AUTHORS.md)    */
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/* "Software"), to deal in the Software without restriction, including   */
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/* distribute, sublicense, and/or sell copies of the Software, and to    */
/* 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        */
/* included in all copies or substantial portions of the Software.       */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
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/*************************************************************************/
#include "canvas_layer.h"
#include "viewport.h"

void CanvasLayer::set_layer(int p_xform) {

	layer = p_xform;
	if (viewport.is_valid())
		VisualServer::get_singleton()->viewport_set_canvas_layer(viewport, canvas->get_canvas(), layer);
}

int CanvasLayer::get_layer() const {

	return layer;
}

void CanvasLayer::set_transform(const Matrix32 &p_xform) {

	transform = p_xform;
	locrotscale_dirty = true;
	if (viewport.is_valid())
		VisualServer::get_singleton()->viewport_set_canvas_transform(viewport, canvas->get_canvas(), transform);
}

Matrix32 CanvasLayer::get_transform() const {

	return transform;
}

void CanvasLayer::_update_xform() {

	transform.set_rotation_and_scale(rot, scale);
	transform.set_origin(ofs);
	if (viewport.is_valid())
		VisualServer::get_singleton()->viewport_set_canvas_transform(viewport, canvas->get_canvas(), transform);
}

void CanvasLayer::_update_locrotscale() {

	ofs = transform.elements[2];
	rot = transform.get_rotation();
	scale = transform.get_scale();
	locrotscale_dirty = false;
}

void CanvasLayer::set_offset(const Vector2 &p_offset) {

	if (locrotscale_dirty)
		_update_locrotscale();

	ofs = p_offset;
	_update_xform();
}

Vector2 CanvasLayer::get_offset() const {

	if (locrotscale_dirty)
		const_cast<CanvasLayer *>(this)->_update_locrotscale();

	return ofs;
}

void CanvasLayer::set_rotation(real_t p_radians) {

	if (locrotscale_dirty)
		_update_locrotscale();

	rot = p_radians;
	_update_xform();
}

real_t CanvasLayer::get_rotation() const {

	if (locrotscale_dirty)
		const_cast<CanvasLayer *>(this)->_update_locrotscale();

	return rot;
}

void CanvasLayer::set_rotationd(real_t p_degrees) {

	set_rotation(Math::deg2rad(p_degrees));
}

real_t CanvasLayer::get_rotationd() const {

	return Math::rad2deg(get_rotation());
}

// Kept for compatibility after rename to {s,g}et_rotationd.
// Could be removed after a couple releases.
void CanvasLayer::_set_rotationd(real_t p_degrees) {

	WARN_PRINT("Deprecated method CanvasLayer._set_rotationd(): This method was renamed to set_rotationd. Please adapt your code accordingly, as the old method will be obsoleted.");
	set_rotationd(p_degrees);
}

real_t CanvasLayer::_get_rotationd() const {

	WARN_PRINT("Deprecated method CanvasLayer._get_rotationd(): This method was renamed to get_rotationd. Please adapt your code accordingly, as the old method will be obsoleted.");
	return get_rotationd();
}

void CanvasLayer::set_scale(const Vector2 &p_scale) {

	if (locrotscale_dirty)
		_update_locrotscale();

	scale = p_scale;
	_update_xform();
}

Vector2 CanvasLayer::get_scale() const {

	if (locrotscale_dirty)
		const_cast<CanvasLayer *>(this)->_update_locrotscale();

	return scale;
}

Ref<World2D> CanvasLayer::get_world_2d() const {

	return canvas;
}

void CanvasLayer::_notification(int p_what) {

	switch (p_what) {

		case NOTIFICATION_ENTER_TREE: {

			if (custom_viewport && ObjectDB::get_instance(custom_viewport_id)) {

				vp = custom_viewport;
			} else {
				vp = Node::get_viewport();
			}
			ERR_FAIL_COND(!vp);
			viewport = vp->get_viewport();

			VisualServer::get_singleton()->viewport_attach_canvas(viewport, canvas->get_canvas());
			VisualServer::get_singleton()->viewport_set_canvas_layer(viewport, canvas->get_canvas(), layer);
			VisualServer::get_singleton()->viewport_set_canvas_transform(viewport, canvas->get_canvas(), transform);

		} break;
		case NOTIFICATION_EXIT_TREE: {

			VisualServer::get_singleton()->viewport_remove_canvas(viewport, canvas->get_canvas());
			viewport = RID();

		} break;
	}
}

Size2 CanvasLayer::get_viewport_size() const {

	if (!is_inside_tree())
		return Size2(1, 1);

	Rect2 r = vp->get_visible_rect();
	return r.size;
}

RID CanvasLayer::get_viewport() const {

	return viewport;
}

void CanvasLayer::set_custom_viewport(Node *p_viewport) {
	ERR_FAIL_NULL(p_viewport);
	if (is_inside_tree()) {
		VisualServer::get_singleton()->viewport_remove_canvas(viewport, canvas->get_canvas());
		viewport = RID();
	}

	custom_viewport = p_viewport->cast_to<Viewport>();

	if (custom_viewport) {
		custom_viewport_id = custom_viewport->get_instance_ID();
	} else {
		custom_viewport_id = 0;
	}

	if (is_inside_tree()) {

		if (custom_viewport)
			vp = custom_viewport;
		else
			vp = Node::get_viewport();

		viewport = vp->get_viewport();

		VisualServer::get_singleton()->viewport_attach_canvas(viewport, canvas->get_canvas());
		VisualServer::get_singleton()->viewport_set_canvas_layer(viewport, canvas->get_canvas(), layer);
		VisualServer::get_singleton()->viewport_set_canvas_transform(viewport, canvas->get_canvas(), transform);
	}
}

Node *CanvasLayer::get_custom_viewport() const {

	return custom_viewport;
}

void CanvasLayer::_bind_methods() {

	ObjectTypeDB::bind_method(_MD("set_layer", "layer"), &CanvasLayer::set_layer);
	ObjectTypeDB::bind_method(_MD("get_layer"), &CanvasLayer::get_layer);

	ObjectTypeDB::bind_method(_MD("set_transform", "transform"), &CanvasLayer::set_transform);
	ObjectTypeDB::bind_method(_MD("get_transform"), &CanvasLayer::get_transform);

	ObjectTypeDB::bind_method(_MD("set_offset", "offset"), &CanvasLayer::set_offset);
	ObjectTypeDB::bind_method(_MD("get_offset"), &CanvasLayer::get_offset);

	ObjectTypeDB::bind_method(_MD("set_rotation", "radians"), &CanvasLayer::set_rotation);
	ObjectTypeDB::bind_method(_MD("get_rotation"), &CanvasLayer::get_rotation);

	ObjectTypeDB::bind_method(_MD("set_rotationd", "degrees"), &CanvasLayer::set_rotationd);
	ObjectTypeDB::bind_method(_MD("get_rotationd"), &CanvasLayer::get_rotationd);

	// TODO: Obsolete those two methods (old name) properly (GH-4397)
	ObjectTypeDB::bind_method(_MD("_set_rotationd", "degrees"), &CanvasLayer::_set_rotationd);
	ObjectTypeDB::bind_method(_MD("_get_rotationd"), &CanvasLayer::_get_rotationd);

	ObjectTypeDB::bind_method(_MD("set_scale", "scale"), &CanvasLayer::set_scale);
	ObjectTypeDB::bind_method(_MD("get_scale"), &CanvasLayer::get_scale);

	ObjectTypeDB::bind_method(_MD("set_custom_viewport", "viewport:Viewport"), &CanvasLayer::set_custom_viewport);
	ObjectTypeDB::bind_method(_MD("get_custom_viewport:Viewport"), &CanvasLayer::get_custom_viewport);

	ObjectTypeDB::bind_method(_MD("get_world_2d:World2D"), &CanvasLayer::get_world_2d);
	//	ObjectTypeDB::bind_method(_MD("get_viewport"),&CanvasLayer::get_viewport);

	ADD_PROPERTY(PropertyInfo(Variant::INT, "layer", PROPERTY_HINT_RANGE, "-128,128,1"), _SCS("set_layer"), _SCS("get_layer"));
	//ADD_PROPERTY( PropertyInfo(Variant::MATRIX32,"transform",PROPERTY_HINT_RANGE),_SCS("set_transform"),_SCS("get_transform") );
	ADD_PROPERTY(PropertyInfo(Variant::VECTOR2, "offset"), _SCS("set_offset"), _SCS("get_offset"));
	ADD_PROPERTY(PropertyInfo(Variant::REAL, "rotation"), _SCS("set_rotationd"), _SCS("get_rotationd"));
	ADD_PROPERTY(PropertyInfo(Variant::VECTOR2, "scale"), _SCS("set_scale"), _SCS("get_scale"));
}

CanvasLayer::CanvasLayer() {

	vp = NULL;
	scale = Vector2(1, 1);
	rot = 0;
	locrotscale_dirty = false;
	layer = 1;
	canvas = Ref<World2D>(memnew(World2D));
	custom_viewport = NULL;
	custom_viewport_id = 0;
}