/*
 * Copyright 2017 Red Hat, Inc. and/or its affiliates.
 *
 * 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.kie.internal.runtime.manager.deploy;

import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;

import org.kie.internal.runtime.conf.DeploymentDescriptor;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class DeploymentDescriptorManager {

    private static final Logger logger = LoggerFactory.getLogger(DeploymentDescriptorManager.class);

    private String defaultPU = "org.jbpm.persistence.jpa";

    public DeploymentDescriptorManager() {

    }

    public DeploymentDescriptorManager(String defaultPU) {
        this.defaultPU = defaultPU;
    }

    public DeploymentDescriptor getDefaultDescriptor() {
        DeploymentDescriptor defaultDesc = null;
        URL defaultDescriptorLocation = getDefaultdescriptorlocation();

        if (defaultDescriptorLocation != null) {
            try {
                logger.debug("Reading default descriptor from " + defaultDescriptorLocation);
                defaultDesc = DeploymentDescriptorIO.fromXml(defaultDescriptorLocation.openStream());
            } catch (IOException e) {
                throw new RuntimeException("Unable to read default deployment descriptor from " + defaultDescriptorLocation, e);
            }
        } else {
            logger.debug("No descriptor found returning default instance");
            defaultDesc = new DeploymentDescriptorImpl(defaultPU);
        }

        return defaultDesc;
    }

    protected URL getDefaultdescriptorlocation() {
        String defaultDescriptorLocation = System.getProperty("org.kie.deployment.desc.location");
        URL locationUrl = null;
        if (defaultDescriptorLocation != null) {
            if (defaultDescriptorLocation.startsWith("classpath:")) {
                String stripedLocation = defaultDescriptorLocation.replaceFirst("classpath:", "");
                locationUrl = this.getClass().getResource(stripedLocation);
                if (locationUrl == null) {
                    locationUrl = Thread.currentThread().getContextClassLoader().getResource(stripedLocation);
                }
            } else {
                try {
                    locationUrl = new URL(defaultDescriptorLocation);
                } catch (MalformedURLException e) {
                    locationUrl = this.getClass().getResource(defaultDescriptorLocation);
                    if (locationUrl == null) {
                        locationUrl = Thread.currentThread().getContextClassLoader().getResource(defaultDescriptorLocation);
                    }
                }
            }
        }

        return locationUrl;
    }

}
