/*************************************************************************/
/*  path.cpp                                                             */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                    http://www.godotengine.org                         */
/*************************************************************************/
/* Copyright (c) 2007-2017 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,  */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
/*************************************************************************/
#include "path.h"
#include "scene/scene_string_names.h"

void Path::_notification(int p_what) {
#if 0
	if (p_what==NOTIFICATION_DRAW && curve.is_valid() && is_inside_scene() && get_scene()->is_editor_hint()) {
		//draw the curve!!

		for(int i=0;i<curve->get_point_count();i++) {

			Vector2 prev_p=curve->get_point_pos(i);

			for(int j=1;j<=8;j++) {

				real_t frac = j/8.0;
				Vector2 p = curve->interpolate(i,frac);
				draw_line(prev_p,p,Color(0.5,0.6,1.0,0.7),2);
				prev_p=p;
			}
		}
	}
#endif
}

void Path::_curve_changed() {


	if (is_inside_tree() && get_tree()->is_editor_hint())
		update_gizmo();
}


void Path::set_curve(const Ref<Curve3D>& p_curve) {

	if (curve.is_valid()) {
		curve->disconnect("changed",this,"_curve_changed");
	}

	curve=p_curve;

	if (curve.is_valid()) {
		curve->connect("changed",this,"_curve_changed");
	}
	_curve_changed();

}

Ref<Curve3D> Path::get_curve() const{

	return curve;
}

void Path::_bind_methods() {

	ClassDB::bind_method(_MD("set_curve","curve:Curve3D"),&Path::set_curve);
	ClassDB::bind_method(_MD("get_curve:Curve3D","curve"),&Path::get_curve);
	ClassDB::bind_method(_MD("_curve_changed"),&Path::_curve_changed);

	ADD_PROPERTY( PropertyInfo( Variant::OBJECT, "curve", PROPERTY_HINT_RESOURCE_TYPE, "Curve3D"), _SCS("set_curve"),_SCS("get_curve"));
}

Path::Path() {

	set_curve(Ref<Curve3D>( memnew( Curve3D ))); //create one by default
}


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


void PathFollow::_update_transform() {


	if (!path)
		return;

	Ref<Curve3D> c =path->get_curve();
	if (!c.is_valid())
		return;


	float o = offset;
	if (loop)
		o=Math::fposmod(o,c->get_baked_length());

	Vector3 pos = c->interpolate_baked(o,cubic);
	Transform t=get_transform();


	if (rotation_mode!=ROTATION_NONE) {

		Vector3 n = (c->interpolate_baked(o+lookahead,cubic)-pos).normalized();

		if (rotation_mode==ROTATION_Y) {

			n.y=0;
			n.normalize();
		}

		if (n.length()<CMP_EPSILON) {//nothing, use previous
			n=-t.get_basis().get_axis(2).normalized();
		}


		Vector3 up = Vector3(0,1,0);

		if (rotation_mode==ROTATION_XYZ) {

			float tilt = c->interpolate_baked_tilt(o);
			if (tilt!=0) {

				Matrix3 rot(-n,tilt); //remember.. lookat will be znegative.. znegative!! we abide by opengl clan.
				up=rot.xform(up);
			}
		}

		t.set_look_at(pos,pos+n,up);

	} else {

		t.origin=pos;
	}

	t.origin+=t.basis.get_axis(0)*h_offset + t.basis.get_axis(1)*v_offset;
	set_transform(t);

}

void PathFollow::_notification(int p_what) {


	switch(p_what) {

		case NOTIFICATION_ENTER_TREE: {

			Node *parent=get_parent();
			if (parent) {

				path=parent->cast_to<Path>();
				if (path) {
					_update_transform();
				}
			}

		} break;
		case NOTIFICATION_EXIT_TREE: {


			path=NULL;
		} break;
	}

}

void PathFollow::set_cubic_interpolation(bool p_enable) {

	cubic=p_enable;
}

bool PathFollow::get_cubic_interpolation() const {

	return cubic;
}


bool PathFollow::_set(const StringName& p_name, const Variant& p_value) {

	if (p_name==SceneStringNames::get_singleton()->offset) {
		set_offset(p_value);
	} else if (p_name==SceneStringNames::get_singleton()->unit_offset) {
		set_unit_offset(p_value);
	} else if (p_name==SceneStringNames::get_singleton()->rotation_mode) {
		set_rotation_mode(RotationMode(p_value.operator int()));
	} else if (p_name==SceneStringNames::get_singleton()->v_offset) {
		set_v_offset(p_value);
	} else if (p_name==SceneStringNames::get_singleton()->h_offset) {
		set_h_offset(p_value);
	} else if (String(p_name)=="cubic_interp") {
		set_cubic_interpolation(p_value);
	} else if (String(p_name)=="loop") {
		set_loop(p_value);
	} else if (String(p_name)=="lookahead") {
		set_lookahead(p_value);
	} else
		return false;

	return true;
}

bool PathFollow::_get(const StringName& p_name,Variant &r_ret) const{

	if (p_name==SceneStringNames::get_singleton()->offset) {
		r_ret=get_offset();
	} else if (p_name==SceneStringNames::get_singleton()->unit_offset) {
		r_ret=get_unit_offset();
	} else if (p_name==SceneStringNames::get_singleton()->rotation_mode) {
		r_ret=get_rotation_mode();
	} else if (p_name==SceneStringNames::get_singleton()->v_offset) {
		r_ret=get_v_offset();
	} else if (p_name==SceneStringNames::get_singleton()->h_offset) {
		r_ret=get_h_offset();
	} else if (String(p_name)=="cubic_interp") {
		r_ret=cubic;
	} else if (String(p_name)=="loop") {
		r_ret=loop;
	} else if (String(p_name)=="lookahead") {
		r_ret=lookahead;
	} else
		return false;

	return true;

}
void PathFollow::_get_property_list( List<PropertyInfo> *p_list) const{

	float max=10000;
	if (path && path->get_curve().is_valid())
		max=path->get_curve()->get_baked_length();
	p_list->push_back( PropertyInfo( Variant::REAL, "offset", PROPERTY_HINT_RANGE,"0,"+rtos(max)+",0.01"));
	p_list->push_back( PropertyInfo( Variant::REAL, "unit_offset", PROPERTY_HINT_RANGE,"0,1,0.0001",PROPERTY_USAGE_EDITOR));
	p_list->push_back( PropertyInfo( Variant::REAL, "h_offset") );
	p_list->push_back( PropertyInfo( Variant::REAL, "v_offset") );
	p_list->push_back( PropertyInfo( Variant::INT, "rotation_mode", PROPERTY_HINT_ENUM,"None,Y,XY,XYZ"));
	p_list->push_back( PropertyInfo( Variant::BOOL, "cubic_interp"));
	p_list->push_back( PropertyInfo( Variant::BOOL, "loop"));
	p_list->push_back( PropertyInfo( Variant::REAL, "lookahead",PROPERTY_HINT_RANGE,"0.001,1024.0,0.001"));
}


void PathFollow::_bind_methods() {

	ClassDB::bind_method(_MD("set_offset","offset"),&PathFollow::set_offset);
	ClassDB::bind_method(_MD("get_offset"),&PathFollow::get_offset);

	ClassDB::bind_method(_MD("set_h_offset","h_offset"),&PathFollow::set_h_offset);
	ClassDB::bind_method(_MD("get_h_offset"),&PathFollow::get_h_offset);

	ClassDB::bind_method(_MD("set_v_offset","v_offset"),&PathFollow::set_v_offset);
	ClassDB::bind_method(_MD("get_v_offset"),&PathFollow::get_v_offset);

	ClassDB::bind_method(_MD("set_unit_offset","unit_offset"),&PathFollow::set_unit_offset);
	ClassDB::bind_method(_MD("get_unit_offset"),&PathFollow::get_unit_offset);

	ClassDB::bind_method(_MD("set_rotation_mode","rotation_mode"),&PathFollow::set_rotation_mode);
	ClassDB::bind_method(_MD("get_rotation_mode"),&PathFollow::get_rotation_mode);

	ClassDB::bind_method(_MD("set_cubic_interpolation","enable"),&PathFollow::set_cubic_interpolation);
	ClassDB::bind_method(_MD("get_cubic_interpolation"),&PathFollow::get_cubic_interpolation);

	ClassDB::bind_method(_MD("set_loop","loop"),&PathFollow::set_loop);
	ClassDB::bind_method(_MD("has_loop"),&PathFollow::has_loop);

	BIND_CONSTANT( ROTATION_NONE );
	BIND_CONSTANT( ROTATION_Y );
	BIND_CONSTANT( ROTATION_XY );
	BIND_CONSTANT( ROTATION_XYZ );

}

void PathFollow::set_offset(float p_offset) {

	offset=p_offset;
	if (path)
		_update_transform();
	_change_notify("offset");
	_change_notify("unit_offset");

}

void PathFollow::set_h_offset(float p_h_offset) {

	h_offset=p_h_offset;
	if (path)
		_update_transform();

}

float PathFollow::get_h_offset() const {

	return h_offset;
}

void PathFollow::set_v_offset(float p_v_offset) {

	v_offset=p_v_offset;
	if (path)
		_update_transform();

}

float PathFollow::get_v_offset() const {

	return v_offset;
}


float PathFollow::get_offset() const{

	return offset;
}

void PathFollow::set_unit_offset(float p_unit_offset) {

	if (path && path->get_curve().is_valid() && path->get_curve()->get_baked_length())
		set_offset(p_unit_offset*path->get_curve()->get_baked_length());

}

float PathFollow::get_unit_offset() const{

	if (path && path->get_curve().is_valid() && path->get_curve()->get_baked_length())
		return get_offset()/path->get_curve()->get_baked_length();
	else
		return 0;
}

void PathFollow::set_lookahead(float p_lookahead) {

	lookahead=p_lookahead;

}

float PathFollow::get_lookahead() const{

	return lookahead;
}

void PathFollow::set_rotation_mode(RotationMode p_rotation_mode) {

	rotation_mode=p_rotation_mode;
	_update_transform();
}

PathFollow::RotationMode PathFollow::get_rotation_mode() const {

	return rotation_mode;
}

void PathFollow::set_loop(bool p_loop) {

	loop=p_loop;
}

bool PathFollow::has_loop() const{

	return loop;
}


PathFollow::PathFollow() {

	offset=0;
	h_offset=0;
	v_offset=0;
	path=NULL;
	rotation_mode=ROTATION_XYZ;
	cubic=true;
	loop=true;
	lookahead=0.1;
}
