import streamSaver from "streamsaver";
import "streamsaver/examples/zip-stream.js";
import store from '@/store'
// 下载文件并压缩
function zipFiles(zipName, files) {
    console.log("同步下载打包开始时间：" + new Date());
    store.dispatch('trials/setUnLock', true)
    // 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 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());
                store.dispatch('trials/setUnLock', false)
            });
    }
}
// 下载文件并修改名称
async function updateFile(file, name) {
    try {
        store.dispatch('trials/setUnLock', true)
        const fileOutputStream = streamSaver.createWriteStream(name);
        let res = await fetch(file);
        res.body.pipeTo(fileOutputStream).then(() => {
            store.dispatch('trials/setUnLock', true)
        });
    } catch (err) {
        console.log(err)
    }
}
export function downLoadFile(file, name, type = 'file') {
    if (type === 'zip') return zipFiles(name, file);
    return updateFile(file, name)

}