package dk.daoas.adressevedligehold.tasks;

import dk.daoas.adressevedligehold.util.TimingHelper;

import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;

public abstract class Task implements Runnable {
	
	public enum TaskState {
		STATE_QUEUED, STATE_RUNNING, STATE_DONE, STATE_ABORTED;
	}
	
	@SuppressFBWarnings("URF_UNREAD_PUBLIC_OR_PROTECTED_FIELD")//bliver læst via gson - og det forvirrer findbugs
	public static class TaskBean {
		public String description;
		public String detail;
		public String errorMessage;
		public double percentCompleted;
		public String state;
	}
	
	protected boolean abort = false;
	protected TaskState state = TaskState.STATE_QUEUED;
	protected TaskManager manager;
	private String errorMsg;
	
	public void setManager(TaskManager manager) {
		this.manager = manager;
	}
	
	@Override
	public final void run() {
		TimingHelper timing = new TimingHelper();
		System.out.println("Starting " + this.getDescription() );
		
		this.state = TaskState.STATE_RUNNING;
		manager.setCurrentTask(this);
		
		try {
			taskRun();
			this.state = TaskState.STATE_DONE;
		} catch (Exception e) {
			this.errorMsg = e.getMessage();
			e.printStackTrace();
			this.state = TaskState.STATE_ABORTED;
		}
		
		manager.setCurrentTask(null);
		
		System.out.println("Done " + this.getDescription() + "   " + timing.getElapsed() + "ms");
	}
	
	
	public TaskState getState() {
		return this.state;
	}
	
	public void doAbort() {
		this.abort = true;
	}
	
	public TaskBean getTaskBean() {
		TaskBean bean = new TaskBean();
		
		bean.description = this.getDescription();
		bean.detail = this.getDetail();
		bean.percentCompleted = this.getPercentCompleted();
		bean.state = this.state.toString();
		bean.errorMessage = this.getErrorMessage();
		
		return bean;
	}
	
	public String getErrorMessage() {
		return this.errorMsg;
	}
	
	/**
	 * @throws Exception
	 * 
	 * Implementing classes should not catch terminating exceptions but let it propagate to Task the Task::run()
	 * method.
	 */
	protected abstract void taskRun() throws Exception;
	
	public abstract String getDescription();
	public abstract String getDetail();
	public abstract short getPercentCompleted();
	
}