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/* 
 * Copyright 2016 Jakub Herkel.
 *
 * 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 sk.uniq.protobuf.schema;

import java.math.BigInteger;
import sk.uniq.protobuf.schema.ProtoConstant.Type;

/**
 *
 * @author jherkel
 */
public class ProtoInteger extends ProtoConstant {

    public ProtoInteger(long value) {
        this(value, Formatter.DECIMAL,null);
    }

    public ProtoInteger(long value, Formatter formatter,String sourceText) {
        super(value, formatter,sourceText);
    }

    @Override
    public Type getType() {
        return Type.INTEGER;
    }

    public static ProtoInteger parse(String text) {
        return parse(text, false);
    }

    public static ProtoInteger parse(String text, boolean minusFlag) {
        if (text.isEmpty()) {
            throw new IllegalArgumentException("Invalid input, empty text");
        }
        if (text.charAt(0) == '0') {
            // try to parse octal or hexadecimal number
            if (text.length() == 1) {
                return new ProtoInteger(0, Formatter.OCTAL,text);
            }
            if (text.charAt(1) == 'x' || text.charAt(1) == 'X') {
                // hexadecimal character
                if (text.length() < 3 || Character.digit(text.charAt(2), 16) == -1) {
                    throw new IllegalArgumentException("Invalid hexadecimal value " + text);
                }
                BigInteger bi = new BigInteger(text.substring(2), 16);
                return new ProtoInteger(minusFlag == true ? -bi.longValue() : bi.longValue(), Formatter.HEXADECIMAL,text);
            } else {
                // octal number
                BigInteger bi = new BigInteger(text.substring(1), 8);
                return new ProtoInteger(minusFlag == true ? -bi.longValue() : bi.longValue(), Formatter.OCTAL,text);
            }

        } else if (Character.isDigit(text.charAt(0)) == true) {
            BigInteger bi = new BigInteger(text);
            return new ProtoInteger(minusFlag == true ? -bi.longValue() : bi.longValue(), Formatter.DECIMAL,text);
        } else {
            throw new IllegalArgumentException("Invalid integer value " + text);
        }
    }

    public enum Formatter implements ConstantFormatter {
        DECIMAL {
            @Override
            public String toString(Long value) {
                return Long.toString(value);
            }
        },
        HEXADECIMAL {
            @Override
            public String toString(Long value) {
                return Long.toHexString(value);
            }
        },
        OCTAL {
            @Override
            public String toString(Long value) {
                return Long.toOctalString(value);
            }
        };

    }
}