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/*
 * Copyright (c) 2009-2015
 * 	IT-Consulting Stephan Schloepke (http://www.schloepke.de/)
 * 	klemm software consulting Mirko Klemm (http://www.klemm-scs.com/)
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package org.jbasics.utilities;

import org.jbasics.exception.DelegatedException;
import org.jbasics.pattern.transpose.Transposer;
import org.jbasics.types.builders.SetBuilder;

import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.util.Set;

@SuppressWarnings("nls")
public final class StringTransposers {

	public static final Set JAVA_KEYWORD_LIST = new SetBuilder()
			.addAll("abstract", "continue", "for", "new", "switch", "assert", "default", "goto", "package", "synchronized", "boolean", "do", "if",
					"private", "this", "break", "double", "implements", "protected", "throw", "byte", "else", "import", "public", "throws", "case",
					"enum", "instanceof", "return", "transient", "catch", "extends", "int", "short", "try", "char", "final", "interface", "static",
					"void", "class", "finally", "long", "strictfp", "volatile", "const", "float", "native", "super", "while").build();
	public static final Transposer TO_LOWERCASE_TRANSPOSER = new Transposer() {
		@Override
		public String transpose(final String input) {
			if (input == null) {
				return null;
			} else {
				return input.toLowerCase();
			}
		}
	};
	public static final Transposer TO_UPERCASE_TRANSPOSER = new Transposer() {
		@Override
		public String transpose(final String input) {
			if (input == null) {
				return null;
			} else {
				return input.toUpperCase();
			}
		}
	};
	private static final String URL_CODEC_ENCODING = "UTF-8";
	public static final Transposer URL_ENCODE_TRANSPOSER = new Transposer() {
		@Override
		public String transpose(final String input) {
			try {
				if (input == null) {
					return null;
				} else {
					return URLEncoder.encode(input, StringTransposers.URL_CODEC_ENCODING);
				}
			} catch (final UnsupportedEncodingException e) {
				throw DelegatedException.delegate(e);
			}
		}
	};
	public static final Transposer URL_DECODE_TRANSPOSER = new Transposer() {
		@Override
		public String transpose(final String input) {
			try {
				if (input == null) {
					return null;
				} else {
					return URLDecoder.decode(input, StringTransposers.URL_CODEC_ENCODING);
				}
			} catch (final UnsupportedEncodingException e) {
				throw DelegatedException.delegate(e);
			}
		}
	};
	private static final char UNDERSCORE = '_';
	public static final Transposer JAVA_IDENTIFIER_TRANSPOSER = new Transposer() {
		@Override
		public String transpose(final String input) {
			if (input == null) {
				return null;
			} else {
				final StringBuilder temp = new StringBuilder(input.length());
				for (int i = 0; i < input.length(); i++) {
					final char c = input.charAt(i);
					temp.append(Character.isJavaIdentifierPart(c) ? c : StringTransposers.UNDERSCORE);
				}
				if (!Character.isJavaIdentifierStart(temp.charAt(0))) {
					temp.insert(0, StringTransposers.UNDERSCORE);
				}
				return temp.toString();
			}
		}
	};

	public static final Transposer JAVA_KEYWORD_FILTER_TRANSPOSER = new Transposer() {
		@Override
		public String transpose(final String input) {
			if (StringTransposers.JAVA_KEYWORD_LIST.contains(input)) {
				return input + StringTransposers.UNDERSCORE;
			} else {
				return input;
			}
		}
	};
}