const { app } = require('electron')
const fs = require('fs')
const path = require('path')
// const unzipper = require('unzipper')
const fse = require('fs-extra');

// function unzip(source, dest) {
//     return new Promise((resolve, reject) => {
//         fs.createReadStream(source)
//             .pipe(unzipper.Extract({ path: dest }))
//             .promise()
//             .then(() => resolve(true), (e) => reject(e))
//     });
// }

async function checkAppFolder(folderPath) {
    // check index.html
    const htmlFilePath = path.resolve(folderPath, './index.html')
    if (!await fs.existsSync(htmlFilePath)) {
        throw new Error('软件包中缺少入口index.html文件')
    }
    const htmlStr = await fs.readFileSync(htmlFilePath).toString()
    if (!htmlStr.includes('<html')) {
        throw new Error("软件包中index.html不是合法的html文件")
    }

    // check logo.png
    const logoFilePath = path.resolve(folderPath, './logo.png')
    if (!await fs.existsSync(logoFilePath)) {
        throw new Error('软件包中缺少图标文件logo.png')
    }

    // check app.json
    const appJsonFilePath = path.resolve(folderPath, './app.json')
    if (!await fs.existsSync(appJsonFilePath)) {
        throw new Error('软件包中缺少app.json')
    }
    const jsonStr = await fs.readFileSync(appJsonFilePath).toString()
    let json = {}
    try {
        json = JSON.parse(jsonStr)
    } catch (e) {
        throw new Error('解析app.json失败')
    }
    ['id', 'name'].forEach((k) => {
        if (!(typeof json[k] === 'string' && json[k].length >= 2)) {
            throw new Error(`app.json里${k}字段不合法，必须是长度为2以上的字符串`)
        }
    })
    return {
        ...json,
        logoFilePath,
    }
}

module.exports = async (event, zipPath) => {
    const tempDir = path.resolve(app.getPath('temp'), `./s207/install_apps/${Date.now()}`)

    // await unzip(zipPath, tempDir)

    const { id, name } = await checkAppFolder(tempDir)

    const targetDir = path.resolve(app.getPath('home'), `./s207/apps/${id}`)
    if (fse.pathExistsSync(targetDir)) {
        throw new Error(`【${name} id:${id}】应用已存在，请删除后重新安装`)
    }
    await fse.moveSync(tempDir, targetDir)

    return targetDir
}