/*********************************************************************************
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 * The MIT License (MIT)                                                         *
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 * Copyright (c) 2015-2022 aoju.org and other contributors.                      *
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 * in the Software without restriction, including without limitation the rights  *
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package org.aoju.bus.http.plugin.httpz;

import org.aoju.bus.core.io.buffer.Buffer;
import org.aoju.bus.core.io.source.AssignSource;
import org.aoju.bus.core.io.source.BufferSource;
import org.aoju.bus.core.io.source.Source;
import org.aoju.bus.core.lang.MediaType;
import org.aoju.bus.core.toolkit.IoKit;
import org.aoju.bus.http.Response;
import org.aoju.bus.http.bodys.ResponseBody;
import org.aoju.bus.http.metric.Interceptor;

import java.io.IOException;

/**
 * 请求参数-文件处理
 *
 * @author Kimi Liu
 * @since Java 17+
 */
public abstract class FileInterceptor implements Interceptor, ProgressListener {

    @Override
    public Response intercept(Chain chain) throws IOException {
        Response rsp = chain.proceed(chain.request());
        return rsp.newBuilder()
                .body(new DownloadFileProgressResponseBody(rsp.body(), this))
                .build();
    }

    public abstract void updateProgress(long downloadLenth, long totalLength, boolean isFinish);

    public static class DownloadFileProgressResponseBody extends ResponseBody {

        private final ResponseBody body;
        private final ProgressListener progressListener;
        private BufferSource bufferedSource;

        public DownloadFileProgressResponseBody(ResponseBody body, ProgressListener progressListener) {
            this.body = body;
            this.progressListener = progressListener;
        }

        @Override
        public MediaType mediaType() {
            return body.mediaType();
        }

        @Override
        public long length() {
            return body.length();
        }

        @Override
        public BufferSource source() {
            if (null == bufferedSource) {
                bufferedSource = IoKit.buffer(source(body.source()));
            }
            return bufferedSource;
        }

        private Source source(Source source) {
            return new AssignSource(source) {
                long downloadLenth = 0L;

                @Override
                public long read(Buffer sink, long byteCount) throws IOException {
                    long bytesRead = super.read(sink, byteCount);
                    boolean isFinish = (bytesRead == -1);
                    if (!isFinish) {
                        downloadLenth += bytesRead;
                    }
                    progressListener.updateProgress(downloadLenth, body.length(), isFinish);
                    return bytesRead;
                }
            };
        }

    }

}
