package org.april.agirstatool.core;

import java.time.LocalDateTime;
import java.util.Comparator;

/**
 * The Class ProjectComparator.
 */
public class IssueComparator implements Comparator<Issue>
{
	public enum Sorting
	{
		ID,
		PROJECTID,
		CREATEDON,
		CLOSEDON
	}

	private Sorting sorting;

	/**
	 * Instantiates a new project comparator.
	 *
	 * @param sorting
	 *            the sorting
	 */
	public IssueComparator(final Sorting sorting)
	{
		//
		this.sorting = sorting;
	}

	/**
	 * 
	 */
	@Override
	public int compare(final Issue alpha, final Issue bravo)
	{
		int result;

		result = compare(alpha, bravo, this.sorting);

		//
		return result;
	}

	/**
	 * Compare.
	 *
	 * @param alpha
	 *            the alpha
	 * @param bravo
	 *            the bravo
	 * @param sorting
	 *            the sorting
	 * @return the int
	 */
	public static int compare(final Issue alpha, final Issue bravo, final Sorting sorting)
	{
		int result;

		if (sorting == null)
		{
			result = 0;
		}
		else
		{
			switch (sorting)
			{
				default:
				case ID:
					result = CompareUtils.compare(getId(alpha), getId(bravo));
				break;

				case PROJECTID:
					result = CompareUtils.compare(getProjectId(alpha), getProjectId(bravo));
				break;

				case CREATEDON:
					result = CompareUtils.compare(getCreatedOn(alpha), getCreatedOn(bravo));
				break;

				case CLOSEDON:
					result = CompareUtils.compare(getClosedOn(alpha), getClosedOn(bravo));
				break;
			}
		}

		//
		return result;
	}

	/**
	 * Gets the closed on.
	 *
	 * @param source
	 *            the source
	 * @return the closed on
	 */
	public static LocalDateTime getClosedOn(final Issue source)
	{
		LocalDateTime result;

		if (source == null)
		{
			result = null;
		}
		else
		{
			result = source.getClosedOn();
		}

		//
		return result;
	}

	/**
	 * Gets the created on.
	 *
	 * @param source
	 *            the source
	 * @return the created on
	 */
	public static LocalDateTime getCreatedOn(final Issue source)
	{
		LocalDateTime result;

		if (source == null)
		{
			result = null;
		}
		else
		{
			result = source.getCreatedOn();
		}

		//
		return result;
	}

	/**
	 * Gets the id.
	 *
	 * @param source
	 *            the source
	 * @return the id
	 */
	public static Long getId(final Issue source)
	{
		Long result;

		if (source == null)
		{
			result = null;
		}
		else
		{
			result = source.getId();
		}

		//
		return result;
	}

	/**
	 * Gets the identifier.
	 *
	 * @param source
	 *            the source
	 * @return the identifier
	 */
	public static Long getProjectId(final Issue source)
	{
		Long result;

		if (source == null)
		{
			result = null;
		}
		else
		{
			result = source.getProjectId();
		}

		//
		return result;
	}
}