/*-
 * ============LICENSE_START=======================================================
 * openECOMP : SDN-C
 * ================================================================================
 * Copyright (C) 2017 AT&T Intellectual Property. All rights
 * 			reserved.
 * ================================================================================
 * 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.
 * ============LICENSE_END=========================================================
 */

package org.onap.ccsdk.sli.plugins.prop;

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

import org.onap.ccsdk.sli.core.sli.SvcLogicContext;
import org.onap.ccsdk.sli.core.sli.SvcLogicException;
import org.onap.ccsdk.sli.core.sli.SvcLogicJavaPlugin;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class PropertiesNode implements SvcLogicJavaPlugin {

    private static final Logger log = LoggerFactory.getLogger(PropertiesNode.class);

    public void readProperties(Map<String, String> paramMap, SvcLogicContext ctx) throws SvcLogicException {
        String fileName = parseParam(paramMap, "fileName", true, null);
        String contextPrefix = parseParam(paramMap, "contextPrefix", false, null);

        try {
            Properties pp = new Properties();
            InputStream in = new FileInputStream(fileName);
            pp.load(in);
            for (Object key : pp.keySet()) {
                String pfx = contextPrefix != null ? contextPrefix + '.' : "";
                String name = (String) key;
                String value = pp.getProperty(name);
                if (value != null && value.trim().length() > 0) {
                    ctx.setAttribute(pfx + name, value.trim());
                    log.info("+++ " + pfx + name + ": [" + value + "]");
                }
            }
        } catch (IOException e) {
            throw new SvcLogicException("Cannot read property file: " + fileName + ": " + e.getMessage(), e);
        }
    }

    private String parseParam(Map<String, String> paramMap, String name, boolean required, String def)
            throws SvcLogicException {
        String s = paramMap.get(name);

        if (s == null || s.trim().length() == 0) {
            if (!required)
                return def;
            throw new SvcLogicException("Parameter " + name + " is required in PropertiesNode");
        }

        s = s.trim();
        String value = "";
        int i = 0;
        int i1 = s.indexOf('%');
        while (i1 >= 0) {
            int i2 = s.indexOf('%', i1 + 1);
            if (i2 < 0)
                throw new SvcLogicException("Cannot parse parameter " + name + ": " + s + ": no matching %");

            String varName = s.substring(i1 + 1, i2);
            String varValue = System.getenv(varName);
            if (varValue == null)
                varValue = "";

            value += s.substring(i, i1);
            value += varValue;

            i = i2 + 1;
            i1 = s.indexOf('%', i);
        }
        value += s.substring(i);

        log.info("Parameter " + name + ": " + value);
        return value;
    }
}