/*
 * Copyright 2023 Conductor Authors.
 * <p>
 * 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
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * 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 org.conductoross.conductor.os2.dao.query.parser.internal;

import java.io.InputStream;

/**
 * @author Viren
 */
public class Range extends AbstractNode {

    private String low;

    private String high;

    public Range(InputStream is) throws ParserException {
        super(is);
    }

    @Override
    protected void _parse() throws Exception {
        this.low = readNumber(is);

        skipWhitespace();
        byte[] peeked = read(3);
        assertExpected(peeked, "AND");
        skipWhitespace();

        String num = readNumber(is);
        if (num == null || "".equals(num)) {
            throw new ParserException("Missing the upper range value...");
        }
        this.high = num;
    }

    private String readNumber(InputStream is) throws Exception {
        StringBuilder sb = new StringBuilder();
        while (is.available() > 0) {
            is.mark(1);
            char c = (char) is.read();
            if (!isNumeric(c)) {
                is.reset();
                break;
            } else {
                sb.append(c);
            }
        }
        String numValue = sb.toString().trim();
        return numValue;
    }

    /**
     * @return the low
     */
    public String getLow() {
        return low;
    }

    /**
     * @return the high
     */
    public String getHigh() {
        return high;
    }

    @Override
    public String toString() {
        return low + " AND " + high;
    }
}
