/*
 * ====================================================================
 * 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.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 */

package org.apache.hc.client5.http.impl.io;

import java.io.IOException;
import java.net.Socket;
import java.nio.charset.Charset;
import java.nio.charset.CharsetDecoder;
import java.nio.charset.CharsetEncoder;
import java.nio.charset.CodingErrorAction;
import java.util.concurrent.atomic.AtomicLong;

import org.apache.hc.client5.http.io.ManagedHttpClientConnection;
import org.apache.hc.core5.annotation.Contract;
import org.apache.hc.core5.annotation.ThreadingBehavior;
import org.apache.hc.core5.http.ClassicHttpRequest;
import org.apache.hc.core5.http.ClassicHttpResponse;
import org.apache.hc.core5.http.ContentLengthStrategy;
import org.apache.hc.core5.http.config.CharCodingConfig;
import org.apache.hc.core5.http.config.H1Config;
import org.apache.hc.core5.http.impl.DefaultContentLengthStrategy;
import org.apache.hc.core5.http.impl.io.DefaultHttpRequestWriterFactory;
import org.apache.hc.core5.http.io.HttpConnectionFactory;
import org.apache.hc.core5.http.io.HttpMessageParserFactory;
import org.apache.hc.core5.http.io.HttpMessageWriterFactory;

/**
 * Factory for {@link ManagedHttpClientConnection} instances.
 * @since 4.3
 */
@Contract(threading = ThreadingBehavior.IMMUTABLE)
public class ManagedHttpClientConnectionFactory implements HttpConnectionFactory<ManagedHttpClientConnection> {

    private static final AtomicLong COUNTER = new AtomicLong();

    public static final ManagedHttpClientConnectionFactory INSTANCE = new ManagedHttpClientConnectionFactory();

    private final H1Config h1Config;
    private final CharCodingConfig charCodingConfig;
    private final HttpMessageWriterFactory<ClassicHttpRequest> requestWriterFactory;
    private final HttpMessageParserFactory<ClassicHttpResponse> responseParserFactory;
    private final ContentLengthStrategy incomingContentStrategy;
    private final ContentLengthStrategy outgoingContentStrategy;

    public ManagedHttpClientConnectionFactory(
            final H1Config h1Config,
            final CharCodingConfig charCodingConfig,
            final HttpMessageWriterFactory<ClassicHttpRequest> requestWriterFactory,
            final HttpMessageParserFactory<ClassicHttpResponse> responseParserFactory,
            final ContentLengthStrategy incomingContentStrategy,
            final ContentLengthStrategy outgoingContentStrategy) {
        super();
        this.h1Config = h1Config != null ? h1Config : H1Config.DEFAULT;
        this.charCodingConfig = charCodingConfig != null ? charCodingConfig : CharCodingConfig.DEFAULT;
        this.requestWriterFactory = requestWriterFactory != null ? requestWriterFactory :
                DefaultHttpRequestWriterFactory.INSTANCE;
        this.responseParserFactory = responseParserFactory != null ? responseParserFactory :
                DefaultHttpResponseParserFactory.INSTANCE;
        this.incomingContentStrategy = incomingContentStrategy != null ? incomingContentStrategy :
                DefaultContentLengthStrategy.INSTANCE;
        this.outgoingContentStrategy = outgoingContentStrategy != null ? outgoingContentStrategy :
                DefaultContentLengthStrategy.INSTANCE;
    }

    public ManagedHttpClientConnectionFactory(
            final H1Config h1Config,
            final CharCodingConfig charCodingConfig,
            final HttpMessageWriterFactory<ClassicHttpRequest> requestWriterFactory,
            final HttpMessageParserFactory<ClassicHttpResponse> responseParserFactory) {
        this(h1Config, charCodingConfig, requestWriterFactory, responseParserFactory, null, null);
    }

    public ManagedHttpClientConnectionFactory(
            final H1Config h1Config,
            final CharCodingConfig charCodingConfig,
            final HttpMessageParserFactory<ClassicHttpResponse> responseParserFactory) {
        this(h1Config, charCodingConfig, null, responseParserFactory);
    }

    public ManagedHttpClientConnectionFactory() {
        this(null, null, null);
    }

    @Override
    public ManagedHttpClientConnection createConnection(final Socket socket) throws IOException {
        CharsetDecoder chardecoder = null;
        CharsetEncoder charencoder = null;
        final Charset charset = this.charCodingConfig.getCharset();
        final CodingErrorAction malformedInputAction = this.charCodingConfig.getMalformedInputAction() != null ?
                this.charCodingConfig.getMalformedInputAction() : CodingErrorAction.REPORT;
        final CodingErrorAction unmappableInputAction = this.charCodingConfig.getUnmappableInputAction() != null ?
                this.charCodingConfig.getUnmappableInputAction() : CodingErrorAction.REPORT;
        if (charset != null) {
            chardecoder = charset.newDecoder();
            chardecoder.onMalformedInput(malformedInputAction);
            chardecoder.onUnmappableCharacter(unmappableInputAction);
            charencoder = charset.newEncoder();
            charencoder.onMalformedInput(malformedInputAction);
            charencoder.onUnmappableCharacter(unmappableInputAction);
        }
        final String id = "http-outgoing-" + Long.toString(COUNTER.getAndIncrement());
        final DefaultManagedHttpClientConnection conn = new DefaultManagedHttpClientConnection(
                id,
                chardecoder,
                charencoder,
                h1Config,
                incomingContentStrategy,
                outgoingContentStrategy,
                requestWriterFactory,
                responseParserFactory);
        if (socket != null) {
            conn.bind(socket);
        }
        return conn;
    }

}
