/*
 * © 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 MAPLAYER_H
#define MAPLAYER_H

#include <string>
#include <vector>
#include <algorithm>

#include "MapLayerListener.h"

class MapModelElement;


enum class MapLayerType {
	UNKNOWN,
	ROOT,
	REGISTRATION,
	FLOORS,
	FLOOR,
	FLOOR_GROUND,
	FLOOR_OBSTACLES,
	FLOOR_BEACONS,
	FLOOR_ACCESS_POINTS,
	FLOOR_FINGERPRINTS,
	FLOOR_ELEVATORS,
	FLOOR_UNDERLAYS,
	FLOOR_POIS,
	FLOOR_STAIRS,
    FLOOR_GROUND_TRUTH_POINTS
};



class MapLayer {

	/** this layer's elements */
	std::vector<MapModelElement*> elements;

	/** attached listeners (if any) */
	std::vector<MapLayerListener*> listeners;

protected:

	/** this layer's parent */
	MapLayer* parent;

	/** this layer's sublayers */
	std::vector<MapLayer*> sublayers;

	/** this layer's type */
	MapLayerType type;

	/** whether this layer is visible */
	//bool visible;

public:

	/** ctor */
	MapLayer(MapLayer* parent) : parent(parent), type(MapLayerType::UNKNOWN) {
		if (parent) {parent->addSublayer(this);}	// attach myself as child of my parent
	}

	/** ctor */
	MapLayer(MapLayer* parent, MapLayerType type) : parent(parent), type(type) {
		if (parent) {parent->addSublayer(this);}	// attach myself as child of my parent
	}

	/** dtor */
	virtual ~MapLayer() {;}

	/** attach a listener to this layer [usually only added to the root layer] */
	void addListener(MapLayerListener* listener) {
		listeners.push_back(listener);
	}

	/** get the layer's parent */
	MapLayer* getParent() const {return parent;}

	/** get the layer's name */
	virtual std::string getLayerName() const = 0;

	/** get the layer's type */
	MapLayerType getLayerType() const {return type;}


	/** get all elements within this layer */
	const std::vector<MapModelElement*>& getElements() const {return elements;}

	/** get all elements within this layer */
	size_t getNumElements() const {return elements.size();}

	/** remove the given element from the elements list */
	void removeElement(const MapModelElement* elem) {
		elements.erase(std::remove(elements.begin(), elements.end(), elem), elements.end());
		onElemRemoved(elem);
	}

	/** add a new element to this layer */
	void addElement(MapModelElement* el) {
		elements.push_back(el);
		onElemAdded(el);
	}

	/** remove the given sublayer from this layer */
	void removeSublayer(const MapLayer* layer) { sublayers.erase(std::remove(sublayers.begin(), sublayers.end(), layer), sublayers.end()); }

	/** is this layer currently visible? */
//	bool isVisible() const {return visible;}
	virtual bool isVisible() const = 0;

	/** make this layer visible */
//	virtual void setVisible(const bool visible) {
//		this->visible = visible;
//		onVisibilityChanged(visible);
//	}
	virtual void setVisible(const bool visible) = 0;

	/** get all sub-layers within this layer */
	const std::vector<MapLayer*>& getSubLayers() const {return sublayers;}


	/** helper method to get all elements and those of all sub-layers */
	void getVisibleElementsRecursive(std::vector<MapModelElement*>& el) {
		if (isVisible()) {
			const std::vector<MapModelElement*> local = getElements();
			el.insert(el.end(), local.begin(), local.end());
			for (MapLayer* sub : getSubLayers()) {
				sub->getVisibleElementsRecursive(el);
			}
		}
	}

public:

	/** add a new sublayer to this layer */
	void addSublayer(MapLayer* ml) {

		// sanity check before adding
		if (std::find(sublayers.begin(), sublayers.end(), ml) != sublayers.end()) {throw "layer already present!";}
		sublayers.push_back(ml);

	}

	void changed() {
		for (MapLayerListener* listener : listeners) {
			listener->onLayerChanged(this);
		}
	}

protected:

	void onElemAdded(MapModelElement* e) {
		if (parent) {parent->onElemAdded(e);}
		for (MapLayerListener* listener : listeners) {
			listener->onLayerChanged(this);
			listener->onLayerElementAdded(this, e);
		}
	}

	void onElemRemoved(const MapModelElement* e) {
		if (parent) {parent->onElemRemoved(e);}
		for (MapLayerListener* listener : listeners) {
			listener->onLayerChanged(this);
			listener->onLayerElementRemoved(this, e);
		}
	}

	void onVisibilityChanged(const bool visibile) {
		if (parent) {parent->onVisibilityChanged(visibile);}
		for (MapLayerListener* listener : listeners) {
			listener->onLayerChanged(this);
			listener->onLayerVisibilityChanged(this, visibile);
		}
	}

};


class MapLayerRoot : public MapLayer {

public:

	MapLayerRoot(MapLayer* parent) : MapLayer(parent, MapLayerType::ROOT) {;}

	std::string getLayerName() const override {return "root";}

	bool isVisible() const override {
		return true;
	}

	void setVisible(const bool visible) override {
		(void) visible;
		throw "error";
	}

};


#endif // MAPLAYER_H