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/*
 * Copyright 2017 ~ 2025 the original author or authors. James Wong 
 *
 * 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 com.wl4g.infra.common.remoting;

import java.io.IOException;
import java.io.InputStream;
import java.util.Map;

import com.wl4g.infra.common.lang.Assert2;
import com.wl4g.infra.common.remoting.standard.HttpHeaders;
import com.wl4g.infra.common.remoting.standard.HttpStatus;

import io.netty.buffer.ByteBufInputStream;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.http.FullHttpResponse;

/**
 * {@link ClientHttpResponse} implementation based on Netty 4.
 */
class Netty4ClientHttpResponse extends AbstractClientHttpResponse {

    private final ChannelHandlerContext context;
    private final FullHttpResponse nettyResponse;
    private final ByteBufInputStream body;
    private volatile HttpHeaders headers;

    public Netty4ClientHttpResponse(ChannelHandlerContext context, FullHttpResponse nettyResponse) {
        Assert2.notNull(context, "ChannelHandlerContext must not be null");
        Assert2.notNull(nettyResponse, "FullHttpResponse must not be null");
        this.context = context;
        this.nettyResponse = nettyResponse;
        this.body = new ByteBufInputStream(nettyResponse.content());
        this.nettyResponse.retain();
    }

    /**
     * Return the HTTP status code of the response.
     * 
     * @return the HTTP status as an HttpStatus enum value
     * @throws IOException
     *             in case of I/O errors
     * @throws IllegalArgumentException
     *             in case of an unknown HTTP status code
     * @see HttpStatus#valueOf(int)
     */
    public HttpStatus getStatusCode() throws IOException {
        return HttpStatus.valueOf(getRawStatusCode());
    }

    /**
     * Return the HTTP status code (potentially non-standard and not resolvable
     * through the {@link HttpStatus} enum) as an integer.
     * 
     * @return the HTTP status as an integer
     * @throws IOException
     *             in case of I/O errors
     * @since 3.1.1
     * @see #getStatusCode()
     */
    @SuppressWarnings("deprecation")
    public int getRawStatusCode() throws IOException {
        return nettyResponse.getStatus().code();
    }

    /**
     * Return the HTTP status text of the response.
     * 
     * @return the HTTP status text
     * @throws IOException
     *             in case of I/O errors
     */
    @SuppressWarnings("deprecation")
    public String getStatusText() throws IOException {
        return nettyResponse.getStatus().reasonPhrase();
    }

    /**
     * Return the headers of this message.
     * 
     * @return a corresponding HttpHeaders object (never {@code null})
     */
    public HttpHeaders getHeaders() {
        if (headers == null) {
            HttpHeaders headers = new HttpHeaders();
            for (Map.Entry entry : nettyResponse.headers()) {
                headers.add(entry.getKey(), entry.getValue());
            }
            this.headers = headers;
        }
        return headers;
    }

    /**
     * Return the body of the message as an input stream.
     * 
     * @return the input stream body (never {@code null})
     * @throws IOException
     *             in case of I/O errors
     */
    public InputStream getBody() throws IOException {
        return body;
    }

    @Override
    public void close() {
        nettyResponse.release();
        context.close();
    }

}