import streamSaver from "streamsaver";
import "streamsaver/examples/zip-stream.js"
export const downloadImage = (zipName, files) => {
    return new Promise((resolve) => {
        console.log("同步下载打包开始时间：" + new Date());
        // 创建压缩文件输出流  
        const zipFileOutputStream = streamSaver.createWriteStream(zipName);
        // 创建下载文件流  
        const fileIterator = files.values();
        const readableZipStream = new window.ZIP({
            async pull(ctrl) {
                const fileInfo = fileIterator.next();
                if (fileInfo.done) {//迭代终止  
                    ctrl.close();
                } else {
                    const { name, url } = fileInfo.value;
                    return fetch(url).then(res => {
                        ctrl.enqueue({
                            name,
                            stream: () => res.body
                        })
                    })
                }
            }
        });
        if (window.WritableStream && readableZipStream.pipeTo) {
            // 开始下载  
            readableZipStream
                .pipeTo(zipFileOutputStream)
                .then(() => { console.log("同步下载打包结束时间：" + new Date()); resolve(true) })
        } else {
            resolve(false);
        }
    })

};