package classes;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.UUID;

import classes.holonControlUnit.HolonControlUnit;
import ui.controller.Control;
import ui.model.DecoratedNetwork;
import ui.model.Model;

public class Holon {
	public String name = new String();
	private Holon parent = null;
	public ArrayList<Holon> childHolons = new ArrayList<Holon>();
	private List<HolonElement> elements = new ArrayList<HolonElement>();
	//HolonObject is the lowest representation of a holon.
	private final HolonObject holonObject;
	public final boolean isPhysical; 
	public HolonControlUnit holonControlUnit;
	private String uniqueID;
	public Model model;
	
	public Holon(String name, Model model) {
		this.name = name;
		this.holonObject = null;
		isPhysical = false;
		this.holonControlUnit = new HolonControlUnit(this);
		this.uniqueID = UUID.randomUUID().toString();
		this.model = model;
//		System.out.println("Created new Holon "+name+"   "+this.uniqueID);
	}
	
	public Holon(HolonObject object, Model model) {
		holonObject = object;
		object.holon = this;
		name = object.getName();
		this.holonControlUnit = new HolonControlUnit(this);
		elements.addAll(object.getElements());
		for(HolonElement ele : elements) {
			ele.holon = this;
		}
		isPhysical = true;
		this.uniqueID = UUID.randomUUID().toString();
		this.model = model;
//		System.out.println("Created new Holon "+name+"   "+this.uniqueID);
	}
	
	
	public void addElement(HolonElement element) {
		element.holon = this;
		elements.add(element);
	}
	public void removeElement(HolonElement element) {
		element.holon = null;
		elements.remove(element);
	}
	public int elementsCount() {
		return elements.size();
	}
	
	public void addChild(Holon child) {
		if(!this.model.getHolonsByID().containsKey(child.getUniqueID()))
			return;
		child.parent = this;
		childHolons.add(child);
		this.holonControlUnit.addSubHolon(child);
//		System.out.println("Holon "+this.name+" added new child holon "+child.name);
	}
	
	public void addChildHolon(Holon child, int index) {
		child.parent = this;
		childHolons.add(index, child);
		this.holonControlUnit.addSubHolon(child);
//		System.out.println("Holon "+this.name+" added new child holon "+child.name);
	}
	
	public void removeChildHolon(Holon child) {
		child.parent = null;
		childHolons.remove(child);
		this.holonControlUnit.getHierarchyController().removeSubHolon(child.getUniqueID());
	}
	
	public void removeFromParent() {
		if(parent != null) {
			parent.removeChildHolon(this);
		}
	}
	
	
	public int getChildCount() {
		return childHolons.size();
	}
	
	public Holon getParent() {
		return parent;
	}
	
	public void setParent(Holon parent) {
//		System.out.println("Holon "+this.name+" replaced parent "+this.parent.name+" with "+parent.name);
		this.parent = parent;
		this.holonControlUnit.setSuperHolon(parent);
	}
	
	public HolonObject getHolonObject() {
		return holonObject;
	}
	
	
	
	public List<Holon> getChildView(){
		return Collections.unmodifiableList(childHolons);
	}
	
	public List<HolonElement> getElementView(){
		return Collections.unmodifiableList(elements);
	}
	
	@Override
	public String toString() {
		return name;
	}

	public void reassignAllChildren(Holon other) {
		for(Holon child: this.childHolons) {
			other.addChild(child);
		}
		childHolons.clear();
	}
	
	
	public void removeAllRefrences() {
		parent = null;
		this.childHolons.clear();
		this.elements.clear();
	}
	
	
	
	public int getLayer() {
		return parent != null ? parent.getLayer() +  1 : 0;
	}
	
	
	
	public Holon cloneWithoutParent() {
		Holon cloned = new Holon(this.name, this.model);
		model.getHolonsByID().put(cloned.getUniqueID(), cloned);
		cloned.childHolons = this.childHolons;
		cloned.elements = this.elements;
		return cloned;
	}
	
	public boolean checkHolonArePhysicalConnected(Holon other, Control control) {
		HashMap<HolonObject, DecoratedNetwork> table = control.getSimManager().getActualDecorState().getHolonObjectNetworkTable();
		HolonObject a = tryGetAPhysicalHolon();
		HolonObject b = other.tryGetAPhysicalHolon();
		boolean aHolonIsPureAbstract = a == null || b == null;
		return  aHolonIsPureAbstract || table.get(a) == table.get(b);
	}
	
	private HolonObject tryGetAPhysicalHolon() {
		if(holonObject != null) {
			return holonObject;
		}
		for(Holon holon : childHolons) {
			HolonObject object = holon.tryGetAPhysicalHolon();
			if(object != null) {
				return object;
			}
		}
		return null;
	}
	
	
	public void checkRepairHolarchy(HashMap<HolonObject, DecoratedNetwork> table, Holon stateHolon) {
		if(childHolons.isEmpty()) {
			return;
		}
		//To establish the invariant that all child holons are repaired
		for(Holon other : childHolons) {
			other.checkRepairHolarchy(table, stateHolon);
		}
		//Repair this Holon
		HolonObject first = tryGetAPhysicalHolon();
		if(first == null) {
			return;
		}
		List<Holon> removeList = new ArrayList<Holon>();
		for(Holon other : childHolons) {
			HolonObject otherHolonObject = other.tryGetAPhysicalHolon();
			boolean isPureAbstract = otherHolonObject == null;
			if(isPureAbstract) {
				continue;
			}
			boolean isPhysicalConnected = table.get(first) == table.get(otherHolonObject);
			if(!isPhysicalConnected) {
				removeList.add(other);
			}
		}
		//Remove holons
		for(Holon holon : removeList) {
			holon.removeFromParent();
			stateHolon.addChild(holon);
		}
		
	}
	
	public void addNewVirtualNeighbor(String virtualNeighbor) {
		if(!this.equals(virtualNeighbor)) {
			this.holonControlUnit.addNewVirtualNeighbor(virtualNeighbor);
		}
	}
	
	public String getUniqueID() {
		return uniqueID;
	}
	
}