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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.googlecode.wicket.kendo.ui.scheduler.resource;

import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.wicket.util.io.IClusterable;
import org.apache.wicket.util.lang.Args;

import com.googlecode.wicket.jquery.core.Options;

/**
 * Represents a resource Id. The underlying Object T can either be a String or a Number (only Integer is supported)
 *
 * @param  the type of the underlying Object
 * @author Sebastien Briquet - sebfz1
 */
public class Id implements IClusterable
{
	private static final long serialVersionUID = 1L;

	/** Regex pattern used to identify a string-number */
	private static final Pattern PATTERN = Pattern.compile("(\\d+)");

	private final T id;

	/**
	 * Constructor
	 *
	 * @param id - the id (String or Number/Integer)
	 */
	private Id(T id)
	{
		this.id = id;
	}

	/**
	 * Gets the underlying id
	 *
	 * @return the underlying id
	 */
	public T get()
	{
		return this.id;
	}

	/**
	 * Gets the string representation of the id-value
	 *
	 * @return the id-value, as string
	 */
	public String getValue()
	{
		return this.toString();
	}

	@Override
	public int hashCode()
	{
		final int prime = 31;
		int result = 1;
		result = prime * result + (this.id == null ? 0 : this.id.hashCode());

		return result;
	}

	@Override
	public boolean equals(Object object)
	{
		if (this == object)
		{
			return true;
		}

		if (object == null)
		{
			return false;
		}

		if (!(object instanceof Id))
		{
			return false;
		}

		Id other = (Id) object;

		if (this.id == null)
		{
			if (other.id != null)
			{
				return false;
			}
		}
		else if (!this.id.equals(other.id))
		{
			return false;
		}

		return true;
	}

	/**
	 * Converts an id of type I to its corresponding {@link Id} type
	 *
	 * @param id the id-value
	 * @return a new {@code Id}
	 */
	public static  Id valueOf(I id)
	{
		Args.notNull(id, "id");
		
		if (id instanceof String)
		{
			String value = String.valueOf(id);
			Matcher matcher = PATTERN.matcher(value);

			if (matcher.find() && value.equals(matcher.group()))
			{
				return new NumberId(value);
			}

			return new StringId(value);
		}

		if (id instanceof Number)
		{
			return new NumberId((Number) id);
		}

		throw new UnsupportedOperationException("argument 'id' should either be a String or a Number");
	}

	/**
	 * Converts a list of ids of type I to its corresponding {@code List} of {@link Id}
	 *
	 * @param ids the id-values
	 * @return a new {@code Id}
	 */
	public static  List> valueOf(List ids)
	{
		List> list = new ArrayList>();

		for (I id : ids)
		{
			list.add(Id.valueOf(id));
		}

		return list;
	}

	/**
	 * Internal {@code String} {@link Id}
	 */
	private static class StringId extends Id
	{
		private static final long serialVersionUID = 1L;

		public StringId(String id)
		{
			super(id);
		}

		@Override
		public String toString()
		{
			return Options.asString(this.get());
		}
	}

	/**
	 * Internal {@code Number} {@link Id}
	 */
	private static class NumberId extends Id
	{
		private static final long serialVersionUID = 1L;

		public NumberId(Number id)
		{
			super(id);
		}

		public NumberId(String id)
		{
			super(Integer.valueOf(id));
		}

		@Override
		public String toString()
		{
			return String.valueOf(this.get());
		}
	}
}