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/*
 * Copyright (C) 2012 tamtam180
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.arangodb.util;

import java.io.Serializable;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Locale;
import java.util.TimeZone;

import com.google.gson.JsonParseException;

/**
 * @author tamtam180 - kirscheless at gmail.com
 *
 */
public class DateUtils {

	private static TimeZone utcTimeZone = TimeZone.getTimeZone("UTC");

	private static ThreadLocal dateFormats = new ThreadLocal() {
		@Override
		protected LocalFormat initialValue() {
			return new LocalFormat();
		}
	};

	private DateUtils() {
		// this is a helper class
	}

	static class TripleKey
			implements Serializable {
		private static final long serialVersionUID = 2612228100559578823L;
		private T first;
		private U second;
		private V third;

		public TripleKey() {
			// do nothing here
		}

		public TripleKey(T first, U second, V third) {
			this.first = first;
			this.second = second;
			this.third = third;
		}

		public T getFirst() {
			return first;
		}

		public void setFirst(T first) {
			this.first = first;
		}

		public U getSecond() {
			return second;
		}

		public void setSecond(U second) {
			this.second = second;
		}

		public V getThird() {
			return third;
		}

		public void setThird(V third) {
			this.third = third;
		}

		@Override
		public int hashCode() {
			final int prime = 31;
			int result = 1;
			result = prime * result + ((first == null) ? 0 : first.hashCode());
			result = prime * result + ((second == null) ? 0 : second.hashCode());
			result = prime * result + ((third == null) ? 0 : third.hashCode());
			return result;
		}

		@Override
		public boolean equals(Object obj) {
			if (this == obj)
				return true;
			if (obj == null)
				return false;
			if (getClass() != obj.getClass())
				return false;
			TripleKey other = (TripleKey) obj;
			if (first == null) {
				if (other.first != null)
					return false;
			} else if (!first.equals(other.first))
				return false;
			if (second == null) {
				if (other.second != null)
					return false;
			} else if (!second.equals(other.second))
				return false;
			if (third == null) {
				if (other.third != null)
					return false;
			} else if (!third.equals(other.third))
				return false;
			return true;
		}
	}

	private static class LocalFormat {
		private HashMap, SimpleDateFormat> sdfMap = new HashMap, SimpleDateFormat>();

		public SimpleDateFormat getDateFormat(String format, Locale locale, TimeZone timeZone) {
			TripleKey key = new TripleKey(format, locale, timeZone);
			SimpleDateFormat sdf = sdfMap.get(key);
			if (sdf == null) {
				sdf = new SimpleDateFormat(format);
				sdf.setTimeZone(timeZone);
				sdfMap.put(key, sdf);
			}
			return sdf;
		}

	}

	public static Date parse(String text, String format) throws ParseException {

		SimpleDateFormat dateFormat = dateFormats.get().getDateFormat(format, Locale.US, utcTimeZone);

		return dateFormat.parse(text);
	}

	/**
	 * Parse date-string in "yyyy-MM-dd'T'HH:mm:ss'Z'" format.
	 * 
	 * @param dateString
	 * @return a Date object
	 */
	public static Date parse(String dateString) {

		try {
			return DateUtils.parse(dateString, "yyyy-MM-dd'T'HH:mm:ss'Z'");
		} catch (ParseException e) {
			throw new JsonParseException("time format invalid:" + dateString);
		}

	}

	public static String format(Date date, String format) {

		SimpleDateFormat dateFormat = dateFormats.get().getDateFormat(format, Locale.US, TimeZone.getDefault());

		return dateFormat.format(date);
	}

}