/*
 * Copyright (c) 2019-2020. Developed by Hedgecode.
 *
 * 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 org.hedgecode.chess.scanner;

import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

/**
 * ChessHogScanner properties holder.
 *
 * @author Dmitry Samoshin aka gotty
 */
public class ScannerProperties {

    /** Properties file. */
    private static final String PROPERTIES_FILE = "scanner.properties";

    /** Properties. */
    private static final Properties PROPERTIES;

    /**
     * Static properties initialization.
     */
    static {
        PROPERTIES = new Properties();
        readProperties(PROPERTIES_FILE, PROPERTIES, true);
    }

    /**
     * @param propsFile Properties file name.
     * @param props Properties.
     * @param throwExc Flag indicating whether to throw an exception or not.
     */
    public static void readProperties(String propsFile, Properties props, boolean throwExc) {
        try (InputStream is = ScannerProperties.class.getClassLoader().getResourceAsStream(propsFile))
        {
            if (is == null) {
                if (throwExc) {
                    throw new RuntimeException(
                            String.format("Failed to find properties file: %s", propsFile)
                    );
                } else {
                    return;
                }
            }
            props.load(is);
        } catch (IOException cause) {
            throw new RuntimeException(
                    String.format("Failed to read properties file: %s", propsFile),
                    cause
            );
        }
    }

    /**
     * Empty string for not found properties.
     */
    private static final String EMPTY = "";

    /**
     * Gets string property value.
     *
     * @param key Property key.
     * @return Property value (possibly empty string, but never {@code null}).
     */
    public static String get(String key) {
        return PROPERTIES.getProperty(key, EMPTY);
    }

    /**
     * Gets boolean property value.
     *
     * @param key Property key.
     * @return Property value ({@code false} by default).
     */
    public static boolean is(String key) {
        return Boolean.parseBoolean(
                PROPERTIES.getProperty(key, Boolean.FALSE.toString())
        );
    }

    /**
     * Zero integer for not found properties.
     */
    private static final String ZERO = "0";

    /**
     * Gets integer property value.
     *
     * @param key Property key.
     * @return Property value ({@code 0} by default).
     */
    public static int getInt(String key) {
        return Integer.parseInt(
                PROPERTIES.getProperty(key, ZERO)
        );
    }

    /**
     * Private constructor.
     */
    private ScannerProperties() {
    }

}