package org.test4j.hamcrest.matcher.calendar;

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

import org.test4j.module.Test4JException;

import ext.test4j.hamcrest.BaseMatcher;
import ext.test4j.hamcrest.Description;

/**
 * Calendar或Date的格式化值等于期望值断言器
 * 
 * @author darui.wudr
 * 
 */
@SuppressWarnings("rawtypes")
public class DateFormatMatcher extends BaseMatcher {

	final String date;
	final SimpleDateFormat format;

	public DateFormatMatcher(String format, String date) {
		if (date == null) {
			throw new Test4JException("the expected value can't be null!");
		}
		this.date = date;
		try {
			this.format = new SimpleDateFormat(format);
		} catch (IllegalArgumentException e) {
			throw new RuntimeException("illegal date fomat[" + format + "].", e);
		}
	}

	public DateFormatMatcher(SimpleDateFormat format, String date) {
		if (date == null) {
			throw new Test4JException("the expected value can't be null!");
		}
		this.date = date;
		try {
			this.format = format;
		} catch (IllegalArgumentException e) {
			throw new RuntimeException("illegal date fomat[" + format.toPattern() + "].", e);
		}
	}

	String actualDate = null;

	public boolean matches(Object actual) {
		if (actual == null) {
			throw new Test4JException("the actual value can't be null");
		}

		if (actual instanceof Calendar) {
			Date cal = ((Calendar) actual).getTime();
			actualDate = format.format(cal);
		} else if (actual instanceof Date) {
			actualDate = format.format((Date) actual);
		} else {
			throw new Test4JException(
					"the actual value must be a java.util.Date instance or a java.util.Calendar instance");
		}
		boolean isEqual = this.date.equals(actualDate);
		return isEqual;
	}

	public void describeTo(Description description) {
		String message = String.format("expected value is %s by format[%s], but actual value is %s.", this.date,
				this.format.toPattern(), this.actualDate);
		description.appendText(message);
	}
}