const fs = require('fs')
const path = require('path')
const yaml = require('js-yaml')
const { app, BrowserWindow, Menu, dialog } = require('electron')
const { autoUpdater } = require('electron-updater')

const updateHandle = (win) => {
    if (app.isPackaged) {
        const fileContents = fs.readFileSync('resources/app-update.yml', 'utf-8')
        const data = yaml.load(fileContents)

        if (data.url) {
            autoUpdater.autoDownload = false
            autoUpdater.autoInstallOnAppQuit = false

            autoUpdater.setFeedURL({
                provider: data.provider,
                url: data.url
            })

            // 检查更新出错
            autoUpdater.on('error', (err) => {
                dialog.showMessageBox({
                    type: 'error',
                    title: '错误',
                    noLink: true,
                    message: '更新发生错误',
                    detail: err.message
                })
            })

            // 检测到有版本更新
            autoUpdater.on('update-available', (e) => {
                dialog.showMessageBox({
                    type: 'info',
                    title: '提示',
                    noLink: true,
                    message: e.version,
                    detail: '发现新版本，是否现在下载？',
                    buttons: ['取消', '下载']
                }).then((res) => {
                    if (res.response === 1) {
                        autoUpdater.downloadUpdate()
                    }
                })
            })

            // 更新下载进度事件
            autoUpdater.on('download-progress', (progress) => {
                // https://www.electronjs.org/zh/docs/latest/tutorial/progress-bar
                win.setProgressBar(progress.percent / 100)
            })

            // 下载完成，询问用户是否更新
            autoUpdater.on('update-downloaded', (e) => {
                dialog.showMessageBox({
                    type: 'info',
                    title: '提示',
                    noLink: true,
                    message: e.version,
                    detail: '已下载新版本，是否关闭应用更新？',
                    buttons: ['取消', '安装']
                }).then((res) => {
                    if (res.response === 1) {
                        autoUpdater.quitAndInstall()
                    } else {
                        win.setProgressBar(-1)
                    }
                })
            })

            autoUpdater.checkForUpdates()
        }
    }
}

const createWindow = () => {
    Menu.setApplicationMenu(null)

    const win = new BrowserWindow({
        center: true,
        minWidth: 1280,
        minHeight: 800,
        icon: path.resolve(__dirname, 'dist/favicon.ico')
    })

    win.maximize()
    win.loadFile(path.resolve(__dirname, 'dist/index.html'))
    win.on('ready-to-show', () => updateHandle(win))
}

// 阻止应用多开
const gotTheLock = app.requestSingleInstanceLock()
if (!gotTheLock) {
    app.quit()
} else {
    app.whenReady().then(() => {
        createWindow()
    })
}