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package org.eclipse.aether.repository;

/*
 * 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.
 */

/**
 * A proxy to use for connections to a repository.
 */
public final class Proxy
{

    /**
     * Type denoting a proxy for HTTP transfers.
     */
    public static final String TYPE_HTTP = "http";

    /**
     * Type denoting a proxy for HTTPS transfers.
     */
    public static final String TYPE_HTTPS = "https";

    private final String type;

    private final String host;

    private final int port;

    private final Authentication auth;

    /**
     * Creates a new proxy with the specified properties and no authentication.
     * 
     * @param type The type of the proxy, e.g. "http", may be {@code null}.
     * @param host The host of the proxy, may be {@code null}.
     * @param port The port of the proxy.
     */
    public Proxy( String type, String host, int port )
    {
        this( type, host, port, null );
    }

    /**
     * Creates a new proxy with the specified properties.
     * 
     * @param type The type of the proxy, e.g. "http", may be {@code null}.
     * @param host The host of the proxy, may be {@code null}.
     * @param port The port of the proxy.
     * @param auth The authentication to use for the proxy connection, may be {@code null}.
     */
    public Proxy( String type, String host, int port, Authentication auth )
    {
        this.type = ( type != null ) ? type : "";
        this.host = ( host != null ) ? host : "";
        this.port = port;
        this.auth = auth;
    }

    /**
     * Gets the type of this proxy.
     * 
     * @return The type of this proxy, never {@code null}.
     */
    public String getType()
    {
        return type;
    }

    /**
     * Gets the host for this proxy.
     * 
     * @return The host for this proxy, never {@code null}.
     */
    public String getHost()
    {
        return host;
    }

    /**
     * Gets the port number for this proxy.
     * 
     * @return The port number for this proxy.
     */
    public int getPort()
    {
        return port;
    }

    /**
     * Gets the authentication to use for the proxy connection.
     * 
     * @return The authentication to use or {@code null} if none.
     */
    public Authentication getAuthentication()
    {
        return auth;
    }

    @Override
    public String toString()
    {
        return getHost() + ':' + getPort();
    }

    @Override
    public boolean equals( Object obj )
    {
        if ( this == obj )
        {
            return true;
        }
        if ( obj == null || !getClass().equals( obj.getClass() ) )
        {
            return false;
        }

        Proxy that = (Proxy) obj;

        return eq( type, that.type ) && eq( host, that.host ) && port == that.port && eq( auth, that.auth );
    }

    private static  boolean eq( T s1, T s2 )
    {
        return s1 != null ? s1.equals( s2 ) : s2 == null;
    }

    @Override
    public int hashCode()
    {
        int hash = 17;
        hash = hash * 31 + hash( host );
        hash = hash * 31 + hash( type );
        hash = hash * 31 + port;
        hash = hash * 31 + hash( auth );
        return hash;
    }

    private static int hash( Object obj )
    {
        return obj != null ? obj.hashCode() : 0;
    }

}