import { leFuService } from '../../lefu/index'

/** 连接状态事件的取消订阅句柄 */
let unsubDisconnected: (() => void) | null = null
let unsubDeviceConnect: (() => void) | null = null
let retryTimer: number | null = null
/** 获取 WiFi 列表防重入标记 */
let searching = false

/** 渲染用的 WiFi 项（在 SSID 基础上追加连接状态） */
interface WifiItem {
    ssid: string
    connected: boolean
}

type WifiStatus = 'idle' | 'searching' | 'list' | 'empty' | 'password' | 'configuring'
type BleStatus = 'connected' | 'failed' | 'connecting'

Page({
    data: {
        status: 'idle' as WifiStatus,
        deviceName: '智能体重秤',
        bleStatus: 'connected' as BleStatus,
        wifiList: [] as WifiItem[],
        hasConnected: false,
        selectedSsid: '',
        selectWifiPWD: '',
        type: true,
    },

    onLoad() {
        this._initDeviceInfo()
        this._subscribeDisconnect()
        this.onStartSearch()
    },

    onUnload() {
        wx.hideLoading()
        if (retryTimer !== null) { clearTimeout(retryTimer); retryTimer = null }
        unsubDisconnected?.()
        unsubDeviceConnect?.()
        unsubDisconnected = null
        unsubDeviceConnect = null
        leFuService.exitWifiConfig()
    },

    /** 订阅连接状态事件：断开 / 重连时同步状态到 UI */
    _subscribeDisconnect() {
        unsubDisconnected?.()
        unsubDeviceConnect?.()
        unsubDisconnected = leFuService.onDisconnected(() => {
            this.setData({ bleStatus: 'failed' })
        })
        unsubDeviceConnect = leFuService.onDeviceConnect(() => {
            this.setData({ bleStatus: 'connected' })
        })
    },

    /** 初始化设备信息：读取缓存设备名 + 同步蓝牙连接状态 */
    _initDeviceInfo() {
        const cached = wx.getStorageSync('connectDeviceInfo') as Record<string, any> | null
        const deviceName = cached?.scaleDeviceName || cached?.name
        if (deviceName) {
            this.setData({ deviceName })
        }
        this.setData({ bleStatus: leFuService.isConnected ? 'connected' : 'failed' })
    },

    /** 校验设备连接状态：未连接则同步状态 + 提示，返回是否可继续操作 */
    _ensureConnected(): boolean {
        if (leFuService.isConnected) return true
        this.setData({ bleStatus: 'failed' })
        wx.showToast({ title: '设备已断开，请重新连接', icon: 'none' })
        return false
    },

    /** 通过设备协议获取周围 WiFi 列表 */
    async onStartSearch() {
        if (searching) return
        if (!this._ensureConnected()) {
            this.setData({ status: 'idle', wifiList: [] })
            return
        }
        searching = true
        this.setData({ status: 'searching', wifiList: [] })
        wx.showLoading({ title: '正在获取 WiFi 列表...', mask: true })
        try {
            const list = await leFuService.getWifiList()
            wx.hideLoading()
            if (!list.length) {
                this.setData({ status: 'empty', wifiList: [] })
                return
            }
            this.setData({
                status: 'list',
                wifiList: list.map(item => ({ ssid: item.ssid, connected: false })),
            })
        } catch {
            wx.hideLoading()
            this.setData({ status: 'empty', wifiList: [] })
            wx.showToast({ title: '获取 WiFi 列表失败', icon: 'none' })
        } finally {
            searching = false
        }
    },

    onRefresh() {
        this.onStartSearch()
    },

    onTapWifi(e: WechatMiniprogram.TouchEvent) {
        if (!this._ensureConnected()) return
        const ssid = e.currentTarget.dataset.ssid as string
        const target = this.data.wifiList.find(item => item.ssid === ssid)
        if (!target || target.connected) return
        this.setData({ status: 'password', selectedSsid: ssid, selectWifiPWD: '', type: true })
    },

    passwordInput(e: WechatMiniprogram.Input) {
        this.setData({ selectWifiPWD: e.detail.value })
    },

    inputTypeChange() {
        this.setData({ type: !this.data.type })
    },

    onCancelPwd() {
        this.setData({ status: 'list', selectedSsid: '', selectWifiPWD: '' })
    },

    /** 下发配网指令，成功后标记对应 WiFi 已连接 */
    async onConfirmPwd() {
        if (!this._ensureConnected()) return
        const { selectedSsid, selectWifiPWD } = this.data
        if (!selectedSsid) return
        const pwd = selectWifiPWD.trim()
        if (!pwd) {
            wx.showToast({ title: '请输入 Wi-Fi 密码', icon: 'none' })
            return
        }
        if (pwd.length < 8 || pwd.length > 16) {
            wx.showToast({ title: '密码长度需为 8-16 位', icon: 'none' })
            return
        }
        this.setData({ status: 'configuring' })
        wx.showLoading({ title: '正在配网...', mask: true })
        try {
            await leFuService.configWifi(selectedSsid, pwd)
            wx.hideLoading()
            // 配网成功：立即退出配网模式（跳转走 onHide，不触发 onUnload）
            leFuService.exitWifiConfig()
            this.setData({
                status: 'list',
                wifiList: this.data.wifiList.map(item => ({ ...item, connected: item.ssid === selectedSsid })),
                hasConnected: true,
                selectedSsid: '',
                selectWifiPWD: '',
            })
            wx.showToast({ title: '配网成功', icon: 'success' })
        } catch (err: any) {
            wx.hideLoading()
            this.setData({ selectedSsid: '', selectWifiPWD: '' })
            wx.showToast({ title: err?.message || '配网失败', icon: 'none' })
            // 配网失败：延时 1.5s 后清空数据并重新获取 WiFi 列表
            if (retryTimer !== null) { clearTimeout(retryTimer); retryTimer = null }
            retryTimer = setTimeout(() => {
                retryTimer = null
                this.onStartSearch()
            }, 1500)
        }
    },

    onConfirm() {
        if (!this.data.hasConnected) return
        if (!this._ensureConnected()) return
        wx.reLaunch({ url: '/pages/equipment/equipment' })
    },
})