/*
 * Copyright 2013 (c) MuleSoft, Inc.
 *
 * 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.xbib.raml.api.loader;

import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.net.URLConnection;

public class RootRamlUrlResourceLoader implements ResourceLoaderExtended {
    public static final String APPLICATION_RAML = "application/raml+yaml";

    private final String rootRamlUrl;
    private URI callbackParam;

    public RootRamlUrlResourceLoader(String rootRamlUrl) {
        this.rootRamlUrl = rootRamlUrl.endsWith("/") ? rootRamlUrl : rootRamlUrl + "/";
    }

    @Override
    public InputStream fetchResource(String resourceName, ResourceUriCallback callback) {
        try {
            URL url = new URL(resourceName.startsWith(rootRamlUrl) ? resourceName : rootRamlUrl + resourceName);
            final URLConnection connection = url.openConnection();
            connection.setRequestProperty("Accept", APPLICATION_RAML + ", */*");

            if (callback != null) {
                callbackParam = url.toURI();
                callback.onResourceFound(callbackParam);
            }

            return new BufferedInputStream(connection.getInputStream());
        } catch (IOException | URISyntaxException e) {
            return null;
        }
    }

    @Override
    public InputStream fetchResource(String resourceName) {
        return fetchResource(resourceName, null);
    }

    @Override
    public URI getUriCallBackParam() {
        return callbackParam;
    }

}
