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/**
 * Copyright (c) 2000-present Liferay, Inc. All rights reserved.
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 * 1. Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 * 

 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 * 

 * 3. Neither the name of Liferay, Inc. nor the names of its contributors may
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

package com.wedeploy.api.query;

import java.lang.reflect.Array;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

/**
 * Utility class for Query components parsing.
 */
public class Util {

	public static String toString(Iterable value) {
		StringBuilder builder = new StringBuilder();

		builder.append('[');

		Iterator iterator = value.iterator();

		while (iterator.hasNext()) {
			builder.append(toString(iterator.next()));

			if (iterator.hasNext()) {
				builder.append(",");
			}
		}

		builder.append(']');

		return builder.toString();
	}

	public static String toString(Map value) {
		if (value.size() == 0) {
			return "{}";
		}

		StringBuilder builder = new StringBuilder();

		builder.append('{');

		for (Map.Entry entry : value.entrySet()) {
			builder.append(toString(entry.getKey())).append(':');
			builder.append(toString(entry.getValue())).append(",");
		}

		builder.setCharAt(builder.length() - 1, '}');

		return builder.toString();
	}

	public static String toString(Object value) {
		if (value instanceof Embodied) {
			return toString(((Embodied) value).body());
		}

		if (value instanceof Iterable) {
			return toString((Iterable) value);
		}

		if (value instanceof Map) {
			return toString((Map) value);
		}

		if (value instanceof String) {
			return toString((String) value);
		}

		if (value.getClass().isArray()) {
			int length = Array.getLength(value);

			if (length == 0) {
				return "[]";
			}

			StringBuilder builder = new StringBuilder();

			builder.append('[');

			for (int i = 0; i < length; i++) {
				builder.append(toString(Array.get(value, i))).append(',');
			}

			builder.setCharAt(builder.length() - 1, ']');

			return builder.toString();
		}

		return value.toString();
	}

	/**
	 * Wraps a (key, value) pair into a {@link Map}.
	 *
	 * @param key   the map key
	 * @param value the value associated to the key
	 * @return a map with a entry (key, value)
	 */
	public static Map wrap(String key, Object value) {
		Map map = new HashMap();

		map.put(key, value);
		return map;
	}

	protected Util() {
	}

	private static String toString(String value) {
		StringBuilder sb = new StringBuilder();

		sb.append('"');

		int len = value.length();

		for (int i = 0; i < len; i++) {
			char c = value.charAt(i);

			switch (c) {
				case '"':
					sb.append("\\\"");
					break;
				case '\\':
					sb.append("\\\\");
					break;
				case '/':
					sb.append("\\/");
					break;
				case '\b':
					sb.append("\\b");
					break;
				case '\f':
					sb.append("\\f");
					break;
				case '\n':
					sb.append("\\n");
					break;
				case '\r':
					sb.append("\\r");
					break;
				case '\t':
					sb.append("\\t");
					break;
				default:
					sb.append(c);
			}
		}

		sb.append('"');

		return sb.toString();
	}

}