/*
 * Copyright (c) 2015-2019. 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.xml.xspf;

import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.Charset;

/**
 * XSPF API properties holder.
 *
 * @author Dmitry Samoshin aka gotty
 */
public final class XSPFProperties {

    /** Charset. */
    public static final String CHARSET = "xspf.charset";

    /** Formatted output. */
    public static final String FORMATTED = "xspf.formatted.output";

    /** Standalone. */
    public static final String STANDALONE = "xspf.standalone";

    /** Version. */
    public static final String VERSION = "xspf.version";

    /** Inception year. */
    public static final String INCEPTION_YEAR = "xspf.inception.year";

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

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

    /**
     * Static properties initialization.
     */
    static {
        TypedProperties defaults = new TypedProperties() {
            {
                setProperty(CHARSET, XSPFConstants.DEF_CHARSET.name());
                setProperty(FORMATTED, Boolean.TRUE);
                setProperty(STANDALONE, Boolean.FALSE);
            }
        };
        PROPERTIES = new TypedProperties(defaults);
        readProperties(PROPERTIES_FILE, PROPERTIES, true);
    }

    /**
     * Read settings from properties file.
     *
     * @param propsFile properties file name.
     * @param props properties.
     * @param throwExc flag indicating whether to throw an exception or not.
     */
    private static void readProperties(String propsFile, TypedProperties props, boolean throwExc) {
        try (InputStream is = XSPFProperties.class.getClassLoader().getResourceAsStream(propsFile)) {
            if (is == null) {
                if (throwExc)
                    throw new RuntimeException("Failed to find properties file: " + propsFile);
                else
                    return;
            }
            props.load(is);
        }
        catch (IOException e) {
            throw new RuntimeException("Failed to read properties file: " + propsFile, e);
        }
    }

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

    /**
     * Get string property value.
     *
     * @param key property key.
     * @return string value in the property list with the specified key value or empty string.
     */
    public static String getString(String key) {
        return PROPERTIES.getProperty(key, String.class, EMPTY);
    }

    /**
     * Get boolean property value or null if key not found.
     *
     * @param key property key.
     * @return boolean value in the property list with the specified key value.
     */
    public static Boolean getBoolean(String key) {
        return PROPERTIES.getBoolean(key);
    }

    /**
     * Get boolean property value or default value if key not found.
     *
     * @param key property key.
     * @param defaultValue default value if key not found.
     * @return boolean value in the property list with the specified key value.
     */
    public static Boolean getBoolean(String key, boolean defaultValue) {
        return PROPERTIES.getProperty(key, Boolean.class, defaultValue);
    }

    /**
     * Get integer property value or null if key not found..
     *
     * @param key property key.
     * @return integer value in the property list with the specified key value.
     */
    public static Integer getInteger(String key) {
        return PROPERTIES.getInteger(key);
    }

    /**
     * Get integer property value or default value if key not found..
     *
     * @param key property key.
     * @param defaultValue default value if key not found.
     * @return integer value in the property list with the specified key value.
     */
    public static Integer getInteger(String key, int defaultValue) {
        return PROPERTIES.getProperty(key, Integer.class, defaultValue);
    }

    /**
     * Get charset.
     *
     * @return charset value in the property list or default charset value.
     */
    public static Charset getCharset() {
        return Charset.forName(
                PROPERTIES.getString(CHARSET)
        );
    }

    /**
     * Set property value.
     *
     * @param key key to be placed into this property list.
     * @param value value corresponding to key.
     */
    public static void setProperty(String key, Object value) {
        if (PROPERTIES.containsKey(key)) {
            if (PROPERTIES.get(key).getClass().isInstance(value)) {
                PROPERTIES.replace(key, value);
            }
        } else {
            PROPERTIES.setProperty(key, value);
        }
    }

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

}