/**
 * remote 模块用来处理远程仓库相关事务
 */
const path = require("path")
const fs = require("fs")
const JSON5 = require('json5')
const { pipeline, Transform} = require("stream/promises");

module.exports = class Remote {

    constructor() {
        // this.__init()
        this.func_publish = require("./publish")
        this.func_install = require("./install")
    }



    async init() {
        this.webdav = await import("webdav");
        const uConfig = await $context.get("uConfig");
        if ( uConfig.get("remoteServer") ){
            let server = uConfig.get("remoteServer");
            $logger.info("server " + server)
            if ( server.startsWith("webdav") ) {
                server = "http" + server.substring(6)
            }

            if ( uConfig.get("remoteAuth") ) {
                let up = uConfig.get("remoteAuth");
                $logger.info("remoteAuth " +  up)
                up = up.split(":", 2)
                this.client = this.webdav.createClient(
                    server,
                    {
                        username: up[0],
                        password: up[1]
                    }
                );
            } else {
                this.client = this.webdav.createClient(
                    server
                );
            }
        }
    }

    async check() {

        if ( ! this.webdav ) {
            $logger.info("webdav unable")
            return false
        }

        if ( ! this.client ) {
            $logger.info("client unable")
            return false
        }

        try {

            // Get directory contents
            const directoryItems = await this.client.getDirectoryContents("/");
            $logger.info("directoryItems", directoryItems)
            // 是否包含 index.json ?
            // 不包含尝试创建
            // 包含了尝试下载
            const indexJsonFile = this.getIndexJson( directoryItems );
            $logger.info("indexJsonFile", indexJsonFile)
            if ( indexJsonFile ) {
                // 包含了尝试下载
                // 下载有缓存
                this.download(indexJsonFile)
                $logger.info("download index")

            } else {
                // 不包含尝试创建
                await this.affireRemoteStore()
                $logger.info("affireRemoteStore")
            }

            return true
        }catch ( e ) {
            $logger.error("remote check 过程中出错", e)
            console.error(e)
            return false
        }
    }

    /**
     * 先对比时间和长度，有不同才会真正下载，否则使用本地缓存。
     * 本地缓存路径即本地仓库路径
     * @param rFile
     */
    download(rFile){
        const lFilePath = path.resolve($sConfig.getLocalStorePath(), rFile.filename);
        if ( fs.existsSync( lFilePath ) ) {
            const lFileInfo = fs.statSync(lFilePath);
            if ( lFileInfo.size === rFile.length
                && lFileInfo.mtime === rFile.lastmod
            ) {
                // 使用缓存
                $logger.debug("use cache")
                return true
            }
        }

        // 下载并覆盖
        // 不知道是同步还是异步
        this.wDownload( rFile.filename,  lFilePath );


    }

    async affireRemoteStore(){
        // Get directory contents
        const directoryItems = await this.client.getDirectoryContents("/");
        // 是否包含 index.json ?
        // 不包含尝试创建
        // 包含了尝试下载
        const indexJsonFile = this.getIndexJson( directoryItems );
        if ( ! indexJsonFile ) {
            // 创建 index
            await this.client.putFileContents("/index.json",  JSON5.stringify({
                modules : [],
                tmpls : [],
                lists : []
            }, null, 4) , { overwrite: false });
        }

        const modulesFolder = this.getFileInfoByName(directoryItems, "modules")
        if ( ! modulesFolder ) {
            // 创建文件夹
            await this.client.createDirectory("/modules");
        }

        const tmplsFolder = this.getFileInfoByName(directoryItems, "tmpls")
        if ( ! tmplsFolder ) {
            // 创建文件夹
            await this.client.createDirectory("/tmpls");
        }

        const listsFolder = this.getFileInfoByName(directoryItems, "lists")
        if ( ! listsFolder ) {
            // 创建文件夹
            await this.client.createDirectory("/lists");
        }

    }

    getIndexJson(items){
        return this.getFileInfoByName( items, "index.json" );
    }
    getFileInfoByName(items, name){
        if ( ! items || items.length < 1 ) {
            return false;
        }
        for ( let item of items ) {
            if ( item.basename === name ) {
                return item;
            }
        }
        return false;
    }

    async publish(localFile, remotePath){
        return await this.func_publish( this , localFile, remotePath )
    }

    async install(id){
        return this.func_install( this, id )
    }

    async wUpload(from, to, debug){
        const totalSize = fs.statSync(from).size;
        debug ? console.log("totalSize", totalSize) : null
        const rs =  fs.createReadStream( from );
        let wSize = 0;
        let rSize = 0;
        rs.on("data", (r)=>{
            rSize += r.length;
            debug ? console.log("r", rSize * 100 / totalSize + "%") : null
        })
        const ws = this.client.createWriteStream(to)
        ws.on("data", (r)=>{
            wSize += r.length;
            debug ? console.log("w ", wSize * 100 / totalSize + "%") : null
        })
        await pipeline( rs, ws);
        debug ? console.log("finish") : null
    }

    async wDownload(from, to){
        $logger.info("download", from, to )
        const stat = await this.client.stat(from);
        const totalSize = stat.size;
        let wSize = 0;
        let rSize = 0;

        const rs = this.client.createReadStream(from);
        rs.on("data", (r)=>{
            rSize += r.length;
            // console.log("r", rSize * 100 / totalSize)
        })

        const ws = fs.createWriteStream(to);
        ws.on("data", (r)=>{
            wSize += r.length;
            // console.log("w", wSize * 100 / totalSize)
        })
        return await pipeline(
            rs, ws
        )
    }

    async wMkdir(folder){

        const folderfather = path.dirname( folder );
        if ( ! await this.client.exists( folderfather ) ) {
            // await remote.client.createDirectory( folderfather )
            await this.wMkdir( folderfather )
        }

        if ( await this.client.exists( folder ) ) {
            return
        } else {
            await this.client.createDirectory( folder )
        }
    }

    async wGetModuleInfo(id){
        let meta = await this.client.getFileContents("/modules/" + id + "/meta.json", { format: "text" });
        let metaJson = JSON5.parse( meta );
        return metaJson
    }

}