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package com.ozacc.mail.impl;

import java.util.Locale;

/**
 * The Cp932 class contains a utility method for converting Microsoft's
 * Cp 932 into JIS.
 * 
 * 注: このクラスはpublicですが、ozacc-mail library外からは使用しないでください。
 *
 * @author Kazuhiro Kazama
 * @version 1.0 01/06/97
 * 
 * @since 1.0.2
 */
public class Cp932 {

	private static boolean isCp932 = false;

	static {
		String p = System.getProperty("iscp932");
		String os = System.getProperty("os.name");
		if (Locale.getDefault().getLanguage().equals("ja")) {
			if (p != null && Boolean.getBoolean(p))
				isCp932 = true;
			else if (os != null && (os.startsWith("Win")))
				isCp932 = true;
		}
	}

	/*
	 * You can't use this constructor.
	 */
	private Cp932() {}

	/*
	 * This method converts Cp932 to JIS.
	 */
	public static String toJIS(String s) {

		/* commented by otsuka
		 * 
		 * if (!isCp932)
		 * return s;
		 */

		StringBuilder sb = new StringBuilder();
		char c;
		for (int i = 0; i < s.length(); i++) {
			c = s.charAt(i);

			switch (c) {
				case 0xff3c: // FULLWIDTH REVERSE SOLIDUS ->
					c = 0x005c; // REVERSE SOLIDUS
					break;
				case 0xff5e: // FULLWIDTH TILDE ->
					c = 0x301c; // WAVE DASH
					break;
				case 0x2225: // PARALLEL TO ->
					c = 0x2016; // DOUBLE VERTICAL LINE
					break;
				case 0xff0d: // FULLWIDTH HYPHEN-MINUS ->
					c = 0x2212; // MINUS SIGN
					break;
				case 0xffe0: // FULLWIDTH CENT SIGN ->
					c = 0x00a2; // CENT SIGN
					break;
				case 0xffe1: // FULLWIDTH POUND SIGN ->
					c = 0x00a3; // POUND SIGN
					break;
				case 0xffe2: // FULLWIDTH NOT SIGN ->
					c = 0x00ac; // NOT SIGN
					break;
			}
			sb.append(c);
		}
		return new String(sb);
	}

	/*
	 * This method convert JIS to Cp932.
	 */
	public static String toCp932(String s) {
		if (!isCp932)
			return s;
		StringBuilder sb = new StringBuilder();
		char c;
		for (int i = 0; i < s.length(); i++) {
			c = s.charAt(i);

			switch (c) {
				case 0x005c: // REVERSE SOLIDUS ->
					c = 0xff3c; // FULLWIDTH REVERSE SOLIDUS
					break;
				case 0x301c: // WAVE DASH ->
					c = 0xff5e; // FULLWIDTH TILDE
					break;
				case 0x2016: // DOUBLE VERTICAL LINE ->
					c = 0x2225; // PARALLEL TO
					break;
				case 0x2212: // MINUS SIGN ->
					c = 0xff0d; // FULLWIDTH HYPHEN-MINUS
					break;
				case 0x00a2: // CENT SIGN ->
					c = 0xffe0; // FULLWIDTH CENT SIGN
					break;
				case 0x00a3: // POUND SIGN ->
					c = 0xffe1; // FULLWIDTH POUND SIGN
					break;
				case 0x00ac: // NOT SIGN ->
					c = 0xffe2; // FULLWIDTH NOT SIGN
					break;
			}
			sb.append(c);
		}
		return new String(sb);
	}
}