// main/updater.js
const { app, BrowserWindow, ipcMain } = require('electron')
const { autoUpdater } = require('electron-updater')
const log = require('electron-log')
Object.assign(console, log.functions)

const updaterState = {
    updateInProgress: false,
    updateDownloaded: false,
    pendingNavs: [],
}
function flushPendingNavs() {
    const fns = updaterState.pendingNavs.slice()
    updaterState.pendingNavs = []
    for (const fn of fns) try { fn() } catch (e) { console.warn('[Nav defer err]', e) }
}
function broadcast(channel, payload) {
    BrowserWindow.getAllWindows().forEach(w => !w.isDestroyed() && w.webContents.send(channel, payload))
}

function registerUpdater() {
    autoUpdater.logger = log
    autoUpdater.logger.transports.file.level = 'info'
    autoUpdater.autoDownload = true
    autoUpdater.autoInstallOnAppQuit = false

    autoUpdater.on('checking-for-update', () => console.log('[updater] checking...'))
    autoUpdater.on('update-available', (info) => {
        updaterState.updateInProgress = true
        console.log('[updater] available', info.version)
        broadcast('update:available', info)
    })
    autoUpdater.on('update-not-available', () => {
        console.log('[updater] not-available')
        updaterState.updateInProgress = false
        flushPendingNavs()
    })
    let lastSend = 0
    autoUpdater.on('download-progress', (p) => {
        updaterState.updateInProgress = true
        const now = Date.now()
        if (now - lastSend > 150) {
            lastSend = now
            broadcast('update:progress', p)
        }
        const win = BrowserWindow.getAllWindows()[0]
        if (win) win.setProgressBar(p.percent / 100)
    })
    autoUpdater.on('update-downloaded', (info) => {
        console.log('[updater] downloaded')
        updaterState.updateInProgress = true
        updaterState.updateDownloaded = true
        broadcast('update:downloaded', info)
        // 想要自动安装：autoUpdater.quitAndInstall(false, true)
    })
    autoUpdater.on('error', (err) => {
        console.error('[updater] error', err)
        broadcast('update:error', { message: String(err) })
        updaterState.updateInProgress = false
        flushPendingNavs()
    })

    ipcMain.handle('update:quitAndInstall', () => autoUpdater.quitAndInstall(false, true))
    ipcMain.handle('update:checkNow', () => autoUpdater.checkForUpdates())

    autoUpdater.checkForUpdates()
}

module.exports = { registerUpdater, updaterState }