/*
 * Copyright 2009-2010 Yuichiro Moriguchi
 *
 * 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.
 */
package net.morilib.lisp.lingua.numeral;

import net.morilib.lingua.numeral.LatinNumeral;
import net.morilib.lisp.ConsIterator;
import net.morilib.lisp.Datum;
import net.morilib.lisp.Environment;
import net.morilib.lisp.LispBoolean;
import net.morilib.lisp.LispMessage;
import net.morilib.lisp.LispString;
import net.morilib.lisp.Subr;
import net.morilib.lisp.subr.SubrUtils;
import net.morilib.util.Iterators;

/**
 *
 *
 * @author MORIGUCHI, Yuichiro 2012/05/09
 */
public class NumberToLatinNumeral extends Subr {

	/* (non-Javadoc)
	 * @see net.morilib.lisp.Subr#eval(net.morilib.lisp.Datum, net.morilib.lisp.Environment, net.morilib.lisp.LispMessage)
	 */
	@Override
	public Datum eval(Datum body, Environment env, LispMessage mesg) {
		ConsIterator itr = new ConsIterator(body);
		int v = SubrUtils.nextSmallInt(itr, mesg, body);
		String c = SubrUtils.nextSymbolName(itr, "nominative", mesg);
		String g = SubrUtils.nextSymbolName(itr, "neuter", mesg);
		Datum m = Iterators.nextIf(itr, LispBoolean.FALSE);
		String s;
		LatinNumeral.Case cs;
		LatinNumeral.Gender gn;

		SubrUtils.checkTerminated(itr, body, mesg);
		if(c.equals("nominative")) {
			cs = LatinNumeral.Case.NOMINATIVE;
		} else if(c.equals("genitive")) {
			cs = LatinNumeral.Case.GENITIVE;
		} else if(c.equals("dative")) {
			cs = LatinNumeral.Case.DATIVE;
		} else if(c.equals("accusative")) {
			cs = LatinNumeral.Case.ACCUSATIVE;
		} else if(c.equals("ablative")) {
			cs = LatinNumeral.Case.ABLATIVE;
		} else {
			cs = LatinNumeral.Case.NOMINATIVE;
		}

		if(g.equals("neuter")) {
			gn = LatinNumeral.Gender.NEUTER;
		} else if(g.equals("muscline")) {
			gn = LatinNumeral.Gender.MUSCLINE;
		} else if(g.equals("feminine")) {
			gn = LatinNumeral.Gender.FEMININE;
		} else {
			gn = LatinNumeral.Gender.NEUTER;
		}

		if(v <= 0) {
			throw mesg.getError("err.require.int.nonnegative");
		} else if(m.isTrue()) {
			s = LatinNumeral.toNumeralWithMacron(v, gn, cs);
		} else {
			s = LatinNumeral.toNumeral(v, gn, cs);
		}
		return (s == null) ? LispBoolean.FALSE : new LispString(s);
	}

}
