package org.hwo.ui.netplan;

import org.hwo.datetime.Date;
import org.hwo.datetime.DateTime;
import org.hwo.datetime.TimeOfDay;

public class ResourceAvailability {

	private DateTime	startTime;
	private DateTime	endTime;
	
	private String		label;
	
	private ResourceAvailability
						next;
	
	public ResourceAvailability(){
		this.setStartTime(new DateTime());
		this.setEndTime(new DateTime(getStartTime()));
		this.getEndTime().getDate().addDays(3650);
	}

	public ResourceAvailability(DateTime startTime){
		this.setStartTime(startTime);
		this.setEndTime(new DateTime(getStartTime()));
		this.getEndTime().getDate().addDays(3650);
	}

	ResourceAvailability getNextAvailability(){
		return this.getNext();
	}

	public DateTime getStartTime() {
		return new DateTime(startTime);
	}

	public void setStartTime(DateTime startTime) {
		this.startTime = new DateTime(startTime);
	}

	public DateTime getEndTime() {
		return new DateTime(endTime);
	}

	public void setEndTime(DateTime endTime) {
		this.endTime = new DateTime(endTime);
	}

	public String getLabel() {
		return label;
	}

	public void setLabel(String label) {
		this.label = label;
	}

	public ResourceAvailability getNext() {
		return next;
	}

	public void setNext(ResourceAvailability next) {
		this.next = next;
	};

	
	public void makeAvailable(DateTime from,DateTime to){
		makeAvailable(from, to, "-");
	}
	public void makeAvailable(DateTime from,DateTime to,String label){
		ResourceAvailability a = findLastAvailableBefore(from);
		
		if (a != null){
			
			ResourceAvailability na = new ResourceAvailability(from);
			na.setEndTime(to);
			na.setLabel(label);
			
			na.setNext(a.getNext());
			a.setNext(na);
			
			if (a.getEndTime().isAfter(from)){
				a.setEndTime(from);
			}
			
			a = na;
			while (a.getNext() != null){
				if (a.getNext().getStartTime().isBefore(na.getEndTime())){
					if (a.getNext().getEndTime().isBefore(na.getEndTime())){
						a.setNext( a.getNext().getNext() );
						continue;
					}
					a.getNext().setStartTime(na.getEndTime());
				}
				a = a.getNext();
			}
		}
	}

	public void makeUnAvailable(DateTime from,DateTime to){
		ResourceAvailability a = findLastAvailableBefore(from);
		
		if (a != null){
			
			if (a.getEndTime().isAfter(from)){
				a.setEndTime(from);
			}
			
			while (a.getNext()!=null){
				if (a.getNext().getStartTime().isBefore(to)){
					if (a.getNext().getEndTime().isBefore(to)){
						a.setNext(a.getNext().getNext());
						continue;
					}
					a.getNext().setStartTime(to);
				}
				a = a.getNext();
			}
		}
	}
	
	public ResourceAvailability findLastAvailableBefore(DateTime dateTime){
		if (this.startTime.isAfter(dateTime))
			return null;
		
		if (next != null){
			ResourceAvailability a = next.findLastAvailableBefore(dateTime);
			if (a != null)
				return a;
		}
		return this;
	}

	public ResourceAvailability findAvailableAfter(DateTime dateTime){
		if (this.endTime.isAfter(dateTime))
			return this;
		
		if (next != null){
			ResourceAvailability a = next.findAvailableAfter(dateTime);
			if (a != null)
				return a;
		}
		return null;
	}


	@Override
	public String toString() {
		StringBuilder sb = new StringBuilder();
		
		ResourceAvailability ra = this;
		while (ra != null){
			sb.append(String.format("%s %s - %s %s\n",Date.weekdays[ra.getStartTime().getDate().getWeekDay()],ra.getStartTime().toString(),Date.weekdays[ra.getEndTime().getDate().getWeekDay()],ra.getEndTime().toString()));
			ra = ra.getNext();
		}
		
		return sb.toString();
	}
	
	
	public static ResourceAvailability generateWeekly(Date from,int days,boolean[] available){
		return generateWeekly(from, days, available,new TimeOfDay(),TimeOfDay.beforeMidnight());
	}
	public static ResourceAvailability generateWeekly(Date from,int days,boolean[] available,TimeOfDay timeStart,TimeOfDay timeEnd){
		from.addDays(-1);
		ResourceAvailability head = new ResourceAvailability(new DateTime(from, new TimeOfDay()));
		head.setEndTime(new DateTime(from, TimeOfDay.beforeMidnight()));
		
		for (int i=0;i<days;i++){
			from.addDays(1);
			
			DateTime aStart = new DateTime(from, timeStart);
			DateTime aEnd = new DateTime(from, timeEnd);
			
			if (available[from.getWeekDay()])
				head.makeAvailable(aStart, aEnd, Date.weekdays[from.getWeekDay()]);
			
		}
		return head.getNext();
	}
	
	
}