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/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.openejb.util;

import org.apache.commons.lang3.text.StrLookup;
import org.apache.commons.lang3.text.StrSubstitutor;
import org.apache.openejb.loader.SystemInstance;

import java.util.Map;
import java.util.Properties;

public final class PropertyPlaceHolderHelper {
    private static final String PREFIX = "${";
    private static final String SUFFIX = "}";
    private static final Properties CACHE = new Properties();

    public static final StrSubstitutor SUBSTITUTOR = new StrSubstitutor(new PropertiesLookup());

    private PropertyPlaceHolderHelper() {
        // no-op
    }

    public static String simpleValue(final String raw) {
        if (raw == null || !raw.contains(PREFIX) || !raw.contains(SUFFIX)) {
            return raw;
        }


        String value = SUBSTITUTOR.replace(raw);
        if (!value.equals(raw) && value.startsWith("java:")) {
            value = value.substring(5);
        }
        return value;
    }

    public static String value(final String aw) {
        if (aw == null || !aw.contains(PREFIX) || !aw.contains(SUFFIX)) {
            return aw;
        }

        String value = CACHE.getProperty(aw);
        if (value != null) {
            return value;
        }

        value = simpleValue(aw);
        CACHE.setProperty(aw, value);
        return value;
    }

    public static Properties holds(final Properties properties) {
        // we can put null values in SuperProperties, since properties is often of this type we need to tolerate it
        final Properties updated = new SuperProperties();
        if (properties == null) {
            return updated;
        }

        for (Map.Entry entry : properties.entrySet()) {
            final Object rawValue = entry.getValue();
            if (rawValue instanceof String) {
                updated.put(entry.getKey(), value((String) rawValue));
            } else {
                updated.put(entry.getKey(), rawValue);
            }
        }
        return updated;
    }

    public static void holdsWithUpdate(final Properties props) {
        final Properties toUpdate = holds(props);
        props.putAll(toUpdate);
    }

    private static class PropertiesLookup extends StrLookup