/*
 * © Copyright 2014 – Urheberrechtshinweis
 * Alle Rechte vorbehalten / All Rights Reserved
 *
 * Programmcode ist urheberrechtlich geschuetzt.
 * Das Urheberrecht liegt, soweit nicht ausdruecklich anders gekennzeichnet, bei Frank Ebner.
 * Keine Verwendung ohne explizite Genehmigung.
 * (vgl. § 106 ff UrhG / § 97 UrhG)
 */

#ifndef NAVMESHWALKPARAMS_H
#define NAVMESHWALKPARAMS_H

#include "../../geo/Heading.h"
#include "../NavMeshLocation.h"
#include "../NavMeshType.h"

namespace NM {

	/** configure pedestrian StepSizes */
	struct StepSizes {

		float stepSizeFloor_m = NAN;
		float stepSizeStair_m = NAN;

		bool isValid() const {
			return (stepSizeFloor_m==stepSizeFloor_m) && (stepSizeStair_m==stepSizeStair_m);
		}

		template <typename Tria> float inMeter(const int steps, const NavMeshLocation<Tria>& start) const {

			Assert::isTrue(isValid(), "invalid step-sizes given");
			Assert::isNotNull(start.tria, "no starting triangle given");

			if (start.tria->getType() == (int) NM::NavMeshType::STAIR_SKEWED) {
				return stepSizeStair_m * steps;
			} else {
				return stepSizeFloor_m * steps;
			}

//			if (start.tria->isPlain()) {
//				return stepSizeFloor_m * steps;
//			} else {
//				return stepSizeStair_m * steps;
//			}

		}

	};

	/** configure walking from -> to */
	template <typename Tria> struct NavMeshWalkParams {

		/** walk starts here (pos/tria) */
		NavMeshLocation<Tria> start;

		/** direction to walk to */
		Heading heading;

		/** number of steps to walk */
		int numSteps;

		/** configuration for pedestrian's step-sizes */
		StepSizes stepSizes;


		/** empty ctor */
		NavMeshWalkParams() : heading(0) {;}

		/** get the to-be-walked distance (steps vs. current location [stair/floor/..]) */
		float getToBeWalkedDistance() const {
			if (_toBeWalkedDistance != _toBeWalkedDistance) {
				_toBeWalkedDistance = stepSizes.inMeter(numSteps, start);
			}
			return _toBeWalkedDistance;
		}

		void check() const {
			Assert::isFalse(numSteps == 0, "num Steps = 0 is currently not supported. must be >= 1");
		}

	private:

		// precalc
		mutable float _toBeWalkedDistance = NAN;

	};

}

#endif // NAVMESHWALKPARAMS_H