/**
 * ============LICENSE_START====================================================
 * org.onap.aaf
 * ===========================================================================
 * Copyright (c) 2018 AT&T Intellectual Property. All rights reserved.
 * ===========================================================================
 * 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.
 * ============LICENSE_END====================================================
 *
 */

package org.onap.aaf.misc.rosetta;

import java.io.IOException;
import java.io.Reader;
import java.util.Map.Entry;
import java.util.TreeMap;

public class XmlEscape {
	private XmlEscape() {}
	
	private static final TreeMap<String,Integer> charMap; // see initialization at end
	private static final TreeMap<Integer,String> intMap; // see initialization at end

	public static void xmlEscape(StringBuilder sb, Reader r) throws ParseException {
		try {
			int c;
			StringBuilder esc = new StringBuilder();
			for(int cnt = 0;cnt<9 /*max*/; ++cnt) {
				if((c=r.read())<0)throw new ParseException("Invalid Data: Unfinished Escape Sequence");
				if(c!=';') { 
					esc.append((char)c);
				} else { // evaluate
					Integer i = charMap.get(esc.toString());
					if(i==null) {
						// leave in nasty XML format for now.
						sb.append('&');
						sb.append(esc);
						sb.append(';');
					} else {
						sb.append((char)i.intValue());
					}
					break;
				}
			}
			
			
		} catch (IOException e) {
			throw new ParseException(e);
		}
	}
	
	public static void xmlEscape(StringBuilder sb, int chr) {
		sb.append('&');
		sb.append(intMap.get(chr));
		sb.append(';');
	}
	
	public static String convert(StringBuilder insb) {
		int idx, ch;
		StringBuilder sb=null;
		for(idx=0;idx<insb.length();++idx) {
			ch = insb.charAt(idx);
			if(ch>=160 || ch==34 || ch==38 || ch==39 || ch==60 || ch==62) {
				sb = new StringBuilder();
				sb.append(insb,0,idx);
				break;
			}
		}
		
		if(sb==null)return insb.toString();
			
		for(int i=idx;i<insb.length();++i) {
			ch = insb.charAt(i);
			if(ch<160) {
				switch(ch) {
					case 34: sb.append("&quot;"); break;
					case 38: sb.append("&amp;"); break;
					case 39: sb.append("&apos;"); break;
					case 60: sb.append("&lt;"); break;
					case 62: sb.append("&gt;"); break;
					default:
						sb.append((char)ch);
				}
			} else { // use map
				String s = intMap.get(ch);
				if(s==null)sb.append((char)ch);
				else {
					sb.append('&');
					sb.append(s);
					sb.append(';');
				}
			}
		}
		return sb.toString();
	}

	static {
		charMap = new TreeMap<>();
		intMap = new TreeMap<>();
		charMap.put("quot", 34);
		charMap.put("amp",38);
		charMap.put("apos",39);
		charMap.put("lt",60);
		charMap.put("gt",62);
		charMap.put("nbsp",160);
		charMap.put("iexcl",161);
		charMap.put("cent",162);
		charMap.put("pound",163);
		charMap.put("curren",164);
		charMap.put("yen",165);
		charMap.put("brvbar",166);
		charMap.put("sect",167);
		charMap.put("uml",168);
		charMap.put("copy",169);
		charMap.put("ordf",170);
		charMap.put("laquo",171);
		charMap.put("not",172);
		charMap.put("shy",173);
		charMap.put("reg",174);
		charMap.put("macr",175);
		charMap.put("deg",176);
		charMap.put("plusmn",177);
		charMap.put("sup2",178);
		charMap.put("sup3",179);
		charMap.put("acute",180);
		charMap.put("micro",181);
		charMap.put("para",182);
		charMap.put("middot",183);
		charMap.put("cedil",184);
		charMap.put("sup1",185);
		charMap.put("ordm",186);
		charMap.put("raquo",187);
		charMap.put("frac14",188);
		charMap.put("frac12",189);
		charMap.put("frac34",190);
		charMap.put("iquest",191);
		charMap.put("Agrave",192);
		charMap.put("Aacute",193);
		charMap.put("Acirc",194);
		charMap.put("Atilde",195);
		charMap.put("Auml",196);
		charMap.put("Aring",197);
		charMap.put("AElig",198);
		charMap.put("Ccedil",199);
		charMap.put("Egrave",200);
		charMap.put("Eacute",201);
		charMap.put("Ecirc",202);
		charMap.put("Euml",203);
		charMap.put("Igrave",204);
		charMap.put("Iacute",205);
		charMap.put("Icirc",206);
		charMap.put("Iuml",207);
		charMap.put("ETH",208);
		charMap.put("Ntilde",209);
		charMap.put("Ograve",210);
		charMap.put("Oacute",211);
		charMap.put("Ocirc",212);
		charMap.put("Otilde",213);
		charMap.put("Ouml",214);
		charMap.put("times",215);
		charMap.put("Oslash",216);
		charMap.put("Ugrave",217);
		charMap.put("Uacute",218);
		charMap.put("Ucirc",219);
		charMap.put("Uuml",220);
		charMap.put("Yacute",221);
		charMap.put("THORN",222);
		charMap.put("szlig",223);
		charMap.put("agrave",224);
		charMap.put("aacute",225);
		charMap.put("acirc",226);
		charMap.put("atilde",227);
		charMap.put("auml",228);
		charMap.put("aring",229);
		charMap.put("aelig",230);
		charMap.put("ccedil",231);
		charMap.put("egrave",232);
		charMap.put("eacute",233);
		charMap.put("ecirc",234);
		charMap.put("euml",235);
		charMap.put("igrave",236);
		charMap.put("iacute",237);
		charMap.put("icirc",238);
		charMap.put("iuml",239);
		charMap.put("eth",240);
		charMap.put("ntilde",241);
		charMap.put("ograve",242);
		charMap.put("oacute",243);
		charMap.put("ocirc",244);
		charMap.put("otilde",245);
		charMap.put("ouml",246);
		charMap.put("divide",247);
		charMap.put("oslash",248);
		charMap.put("ugrave",249);
		charMap.put("uacute",250);
		charMap.put("ucirc",251);
		charMap.put("uuml",252);
		charMap.put("yacute",253);
		charMap.put("thorn",254);
		charMap.put("yuml",255);
		charMap.put("OElig",338);
		charMap.put("oelig",339);
		charMap.put("Scaron",352);
		charMap.put("scaron",353);
		charMap.put("Yuml",376);
		charMap.put("fnof",402);
		charMap.put("circ",710);
		charMap.put("tilde",732);
		charMap.put("Alpha",913);
		charMap.put("Beta",914);
		charMap.put("Gamma",915);
		charMap.put("Delta",916);
		charMap.put("Epsilon",917);
		charMap.put("Zeta",918);
		charMap.put("Eta",919);
		charMap.put("Theta",920);
		charMap.put("Iota",921);
		charMap.put("Kappa",922);
		charMap.put("Lambda",923);
		charMap.put("Mu",924);
		charMap.put("Nu",925);
		charMap.put("Xi",926);
		charMap.put("Omicron",927);
		charMap.put("Pi",928);
		charMap.put("Rho",929);
		charMap.put("Sigma",931);
		charMap.put("Tau",932);
		charMap.put("Upsilon",933);
		charMap.put("Phi",934);
		charMap.put("Chi",935);
		charMap.put("Psi",936);
		charMap.put("Omega",937);
		charMap.put("alpha",945);
		charMap.put("beta",946);
		charMap.put("gamma",947);
		charMap.put("delta",948);
		charMap.put("epsilon",949);
		charMap.put("zeta",950);
		charMap.put("eta",951);
		charMap.put("theta",952);
		charMap.put("iota",953);
		charMap.put("kappa",954);
		charMap.put("lambda",955);
		charMap.put("mu",956);
		charMap.put("nu",957);
		charMap.put("xi",958);
		charMap.put("omicron",959);
		charMap.put("pi",960);
		charMap.put("rho",961);
		charMap.put("sigmaf",962);
		charMap.put("sigma",963);
		charMap.put("tau",964);
		charMap.put("upsilon",965);
		charMap.put("phi",966);
		charMap.put("chi",967);
		charMap.put("psi",968);
		charMap.put("omega",969);
		charMap.put("thetasym",977);
		charMap.put("upsih",978);
		charMap.put("piv",982);
		charMap.put("ensp",8194);
		charMap.put("emsp",8195);
		charMap.put("thinsp",8201);
		charMap.put("zwnj",8204);
		charMap.put("zwj",8205);
		charMap.put("lrm",8206);
		charMap.put("rlm",8207);
		charMap.put("ndash",8211);
		charMap.put("mdash",8212);
		charMap.put("lsquo",8216);
		charMap.put("rsquo",8217);
		charMap.put("sbquo",8218);
		charMap.put("ldquo",8220);
		charMap.put("rdquo",8221);
		charMap.put("bdquo",8222);
		charMap.put("dagger",8224);
		charMap.put("Dagger",8225);
		charMap.put("bull",8226);
		charMap.put("hellip",8230);
		charMap.put("permil",8240);
		charMap.put("prime",8242);
		charMap.put("Prime",8243);
		charMap.put("lsaquo",8249);
		charMap.put("rsaquo",8250);
		charMap.put("oline",8254);
		charMap.put("frasl",8260);
		charMap.put("euro",8364);
		charMap.put("image",8465);
		charMap.put("weierp",8472);
		charMap.put("real",8476);
		charMap.put("trade",8482);
		charMap.put("alefsym",8501);
		charMap.put("larr",8592);
		charMap.put("uarr",8593);
		charMap.put("rarr",8594);
		charMap.put("darr",8595);
		charMap.put("harr",8596);
		charMap.put("crarr",8629);
		charMap.put("lArr",8656);
		charMap.put("uArr",8657);
		charMap.put("rArr",8658);
		charMap.put("dArr",8659);
		charMap.put("hArr",8660);
		charMap.put("forall",8704);
		charMap.put("part",8706);
		charMap.put("exist",8707);
		charMap.put("empty",8709);
		charMap.put("nabla",8711);
		charMap.put("isin",8712);
		charMap.put("notin",8713);
		charMap.put("ni",8715);
		charMap.put("prod",8719);
		charMap.put("sum",8721);
		charMap.put("minus",8722);
		charMap.put("lowast",8727);
		charMap.put("radic",8730);
		charMap.put("prop",8733);
		charMap.put("infin",8734);
		charMap.put("ang",8736);
		charMap.put("and",8743);
		charMap.put("or",8744);
		charMap.put("cap",8745);
		charMap.put("cup",8746);
		charMap.put("int",8747);
		charMap.put("there4",8756);
		charMap.put("sim",8764);
		charMap.put("cong",8773);
		charMap.put("asymp",8776);
		charMap.put("ne",8800);
		charMap.put("equiv",8801);
		charMap.put("le",8804);
		charMap.put("ge",8805);
		charMap.put("sub",8834);
		charMap.put("sup",8835);
		charMap.put("nsub",8836);
		charMap.put("sube",8838);
		charMap.put("supe",8839);
		charMap.put("oplus",8853);
		charMap.put("otimes",8855);
		charMap.put("perp",8869);
		charMap.put("sdot",8901);
		charMap.put("lceil",8968);
		charMap.put("rceil",8969);
		charMap.put("lfloor",8970);
		charMap.put("rfloor",8971);
		charMap.put("lang",9001);
		charMap.put("rang",9002);
		charMap.put("loz",9674);
		charMap.put("spades",9824);
		charMap.put("clubs",9827);
		charMap.put("hearts",9829);
		charMap.put("diams",9830);
		
		for( Entry<String, Integer> es: charMap.entrySet()) {
			if(es.getValue()>=160); // save small space... note that no longer has amp, etc.
			intMap.put(es.getValue(), es.getKey());
		}
	}

}