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The Async Http Client (AHC) classes.
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/*
 *    Copyright (c) 2014-2024 AsyncHttpClient Project. All rights reserved.
 *
 *    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.asynchttpclient.netty;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufAllocator;
import io.netty.buffer.CompositeByteBuf;
import io.netty.handler.codec.http.EmptyHttpHeaders;
import io.netty.handler.codec.http.HttpHeaders;
import io.netty.handler.codec.http.cookie.ClientCookieDecoder;
import io.netty.handler.codec.http.cookie.Cookie;
import org.asynchttpclient.HttpResponseBodyPart;
import org.asynchttpclient.HttpResponseStatus;
import org.asynchttpclient.Response;
import org.asynchttpclient.uri.Uri;

import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.net.SocketAddress;
import java.nio.ByteBuffer;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;

import static io.netty.handler.codec.http.HttpHeaderNames.CONTENT_TYPE;
import static io.netty.handler.codec.http.HttpHeaderNames.SET_COOKIE;
import static io.netty.handler.codec.http.HttpHeaderNames.SET_COOKIE2;
import static java.nio.charset.StandardCharsets.UTF_8;
import static org.asynchttpclient.util.HttpUtils.extractContentTypeCharsetAttribute;
import static org.asynchttpclient.util.MiscUtils.isNonEmpty;
import static org.asynchttpclient.util.MiscUtils.withDefault;

/**
 * Wrapper around the {@link Response} API.
 */
public class NettyResponse implements Response {

    private final List bodyParts;
    private final HttpHeaders headers;
    private final HttpResponseStatus status;
    private List cookies;

    public NettyResponse(HttpResponseStatus status,
                         HttpHeaders headers,
                         List bodyParts) {
        this.bodyParts = bodyParts;
        this.headers = headers;
        this.status = status;
    }

    private List buildCookies() {

        List setCookieHeaders = headers.getAll(SET_COOKIE2);

        if (!isNonEmpty(setCookieHeaders)) {
            setCookieHeaders = headers.getAll(SET_COOKIE);
        }

        if (isNonEmpty(setCookieHeaders)) {
            List cookies = new ArrayList<>(1);
            for (String value : setCookieHeaders) {
                Cookie c = ClientCookieDecoder.STRICT.decode(value);
                if (c != null) {
                    cookies.add(c);
                }
            }
            return Collections.unmodifiableList(cookies);
        }

        return Collections.emptyList();
    }

    @Override
    public final int getStatusCode() {
        return status.getStatusCode();
    }

    @Override
    public final String getStatusText() {
        return status.getStatusText();
    }

    @Override
    public final Uri getUri() {
        return status.getUri();
    }

    @Override
    public SocketAddress getRemoteAddress() {
        return status.getRemoteAddress();
    }

    @Override
    public SocketAddress getLocalAddress() {
        return status.getLocalAddress();
    }

    @Override
    public final String getContentType() {
        return headers != null ? getHeader(CONTENT_TYPE) : null;
    }

    @Override
    public final String getHeader(CharSequence name) {
        return headers != null ? getHeaders().get(name) : null;
    }

    @Override
    public final List getHeaders(CharSequence name) {
        return headers != null ? getHeaders().getAll(name) : Collections.emptyList();
    }

    @Override
    public final HttpHeaders getHeaders() {
        return headers != null ? headers : EmptyHttpHeaders.INSTANCE;
    }

    @Override
    public final boolean isRedirected() {
        switch (status.getStatusCode()) {
            case 301:
            case 302:
            case 303:
            case 307:
            case 308:
                return true;
            default:
                return false;
        }
    }

    @Override
    public List getCookies() {

        if (headers == null) {
            return Collections.emptyList();
        }

        if (cookies == null) {
            cookies = buildCookies();
        }
        return cookies;

    }

    @Override
    public boolean hasResponseStatus() {
        return status != null;
    }

    @Override
    public boolean hasResponseHeaders() {
        return headers != null && !headers.isEmpty();
    }

    @Override
    public boolean hasResponseBody() {
        return isNonEmpty(bodyParts);
    }

    @Override
    public byte[] getResponseBodyAsBytes() {
        return getResponseBodyAsByteBuffer().array();
    }

    @Override
    public ByteBuffer getResponseBodyAsByteBuffer() {

        int length = 0;
        for (HttpResponseBodyPart part : bodyParts) {
            length += part.length();
        }

        ByteBuffer target = ByteBuffer.wrap(new byte[length]);
        for (HttpResponseBodyPart part : bodyParts) {
            target.put(part.getBodyPartBytes());
        }

        target.flip();
        return target;
    }

    @Override
    public ByteBuf getResponseBodyAsByteBuf() {
        CompositeByteBuf compositeByteBuf = ByteBufAllocator.DEFAULT.compositeBuffer(bodyParts.size());
        for (HttpResponseBodyPart part : bodyParts) {
            compositeByteBuf.addComponent(true, part.getBodyByteBuf());
        }
        return compositeByteBuf;
    }

    @Override
    public String getResponseBody() {
        return getResponseBody(withDefault(extractContentTypeCharsetAttribute(getContentType()), UTF_8));
    }

    @Override
    public String getResponseBody(Charset charset) {
        return new String(getResponseBodyAsBytes(), charset);
    }

    @Override
    public InputStream getResponseBodyAsStream() {
        return new ByteArrayInputStream(getResponseBodyAsBytes());
    }

    @Override
    public String toString() {
        StringBuilder sb = new StringBuilder();
        sb.append(getClass().getSimpleName()).append(" {\n")
                .append("\tstatusCode=").append(getStatusCode()).append('\n')
                .append("\theaders=\n");

        for (Map.Entry header : getHeaders()) {
            sb.append("\t\t").append(header.getKey()).append(": ").append(header.getValue()).append('\n');
        }
        return sb.append("\tbody=\n").append(getResponseBody()).append('\n')
                .append('}').toString();
    }
}