/*
 * 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.eclipse.aether.transport.wagon;

import java.net.URI;
import java.util.Map;
import java.util.Properties;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;

import org.apache.maven.wagon.ConnectionException;
import org.apache.maven.wagon.Wagon;
import org.apache.maven.wagon.authentication.AuthenticationException;
import org.apache.maven.wagon.authentication.AuthenticationInfo;
import org.apache.maven.wagon.proxy.ProxyInfo;

/**
 */
class MemWagonUtils {

    private static final ConcurrentMap<String, Map<String, String>> MOUNTS = new ConcurrentHashMap<>();

    public static Map<String, String> getFilesystem(String id) {
        Map<String, String> fs = MOUNTS.get(id);
        if (fs == null) {
            fs = new ConcurrentHashMap<>();
            Map<String, String> prev = MOUNTS.putIfAbsent(id, fs);
            if (prev != null) {
                fs = prev;
            }
        }
        return fs;
    }

    public static Map<String, String> openConnection(
            Wagon wagon, AuthenticationInfo auth, ProxyInfo proxy, Properties headers)
            throws ConnectionException, AuthenticationException {
        URI uri = URI.create(wagon.getRepository().getUrl());

        String query = uri.getQuery();
        if (query != null) {
            verify(query, "config", String.valueOf(((Configurable) wagon).getConfiguration()));

            verify(query, "userAgent", (headers != null) ? headers.getProperty("User-Agent") : null);
            verify(query, "requestTimeout", Integer.toString(wagon.getTimeout()));

            verify(query, "serverUsername", (auth != null) ? auth.getUserName() : null);
            verify(query, "serverPassword", (auth != null) ? auth.getPassword() : null);
            verify(query, "serverPrivateKey", (auth != null) ? auth.getPrivateKey() : null);
            verify(query, "serverPassphrase", (auth != null) ? auth.getPassphrase() : null);

            verify(query, "proxyHost", (proxy != null) ? proxy.getHost() : null);
            verify(query, "proxyPort", (proxy != null) ? Integer.toString(proxy.getPort()) : null);
            verify(query, "proxyUsername", (proxy != null) ? proxy.getUserName() : null);
            verify(query, "proxyPassword", (proxy != null) ? proxy.getPassword() : null);
        }

        return getFilesystem(uri.getHost());
    }

    private static void verify(String query, String key, String value) throws ConnectionException {
        int index = query.indexOf(key + "=");
        if (index < 0) {
            return;
        }
        String expected = query.substring(index + key.length() + 1);
        index = expected.indexOf("&");
        if (index >= 0) {
            expected = expected.substring(0, index);
        }

        if (expected.length() == 0) {
            if (value != null) {
                throw new ConnectionException("Bad " + key + ": " + value);
            }
        } else if (!expected.equals(value)) {
            throw new ConnectionException("Bad " + key + ": " + value);
        }
    }
}
