/**
 * 全局串口通信服务
 * 从 start.vue 提取，脱离 Vue 组件生命周期
 * 解决 Android 10 后台 Native→JS Bridge 回调被阻塞导致的数据中断问题
 */

import * as db from '@/db/sqlite.js'
import cmd from '@/utils/cmd.js'
import storage from '@/utils/storage.js'
import { formatDateTime, delay, getTimeDifference, compareTimes } from '@/utils/common.js'
import * as Api from '@/api/index.js'
import beeper from '@/utils/beeper.js'
import store from '@/store/index.js'
import wakeLock from '@/utils/wakeLock.js'


const serialService = {
    RS485: null,
    RS232: null,
    timer: null,          // 485轮询定时器 (T2)
    taskTimer: null,      // 业务任务定时器 (T3)
    heartbeatTimer: null, // 心跳检测定时器 (T1)
    last485DataTime: null,
    reconnectCount: 0,
    maxReconnect: 5,
    keepRunning: false,

    // ========== 公开入口 ==========

    /**
     * 初始化串口服务（App.onLaunch 调用）
     * 获取串口实例 → 初始化存储 → 打开双串口 → 启动轮询/心跳/Watcher/保活
     */
    init() {

        this.RS485 = getApp().globalData.RS485
        this.RS232 = getApp().globalData.RS232

        this._initStorage()
        this._initTime()
        this._initDB()

        try {
            this.startRS485()
            this.startRS232()
        } catch (e) {
            console.error('[serialService] 初始化串口失败:', e)
            uni.showToast({ title: '初始化串口失败', icon: 'error' })
        }

        this._initWatchers()

        // 申请WakeLock保持CPU活跃，防止后台Bridge回调被阻塞
        wakeLock.acquire()

        this.keepRunning = true
        console.log('[serialService] 已启动')

    },

    /**
     * 完全停止（去 modbus 等需要独占串口的场景调用）
     * stopSerialPorts + 停止保活
     */
    shutdown() {
        this.keepRunning = false
        this.stopHeartbeatIfNeeded()
        this.stopRS485()
        this.stopRS232()
        if (this.timer) { clearInterval(this.timer); this.timer = null }
        if (this.taskTimer) { clearInterval(this.taskTimer); this.taskTimer = null }
        cmd.clearQueue()
        wakeLock.release()
        this.addLog('串口通信', '服务已停止（shutdown）')
    },

    /**
     * 从 modbus 返回后重启
     */
    async restart() {
        if (!this.RS485 || !this.RS232) {
            this.RS485 = getApp().globalData.RS485
            this.RS232 = getApp().globalData.RS232
        }

        // 重启前清理残留队列，避免旧任务使用过期串口引用
        cmd.clearQueue()

        try {
            this.startRS485()
            this.startRS232()
            this.keepRunning = true
            wakeLock.acquire()
            this.addLog('485通信', '服务已重启（restart）')
        } catch (e) {
            uni.showToast({ title: '重启串口失败', icon: 'error' })
        }
    },

    // ========== 串口启停 ==========
    startRS485() {
        let rs485Conf = storage.get('rs485') || { path: '/dev/ttyUSB2', baudrate: 9600 }
        this.RS485.setPath(rs485Conf.path)
        this.RS485.setBaudrate(rs485Conf.baudrate)
        const state = this.RS485.open()
        if (state) {
            uni.showToast({ title: '485已打开', icon: 'none' })
            this.RS485.onStartAutoReadData((res) => {
                try {
                    let hex = this.RS485.byte2HexString(res)
                    this.handle485HexData(hex)
                } catch (e) {
                    this.addLog('485回调异常', e.message || e)
                }
            })
            // 重置并启动轮询定时器
            clearInterval(this.timer)
            this.readData()

            // 心跳检测
            // this.startHeartbeat()

            // if (this.reconnectCount > 0) {
            //     this.reconnectCount--
            // }
        } else {
            this.stopHeartbeatIfNeeded()
            uni.showToast({ title: '485打开失败', icon: 'error' })
            throw new Error('[重连] RS485 打开失败')
        }
    },

    async startRS232() {
        let rs232Conf = storage.get('rs232') || { path: '/dev/ttyUSB1', baudrate: 115200 }
        this.RS232.setPath(rs232Conf.path)
        this.RS232.setBaudrate(rs232Conf.baudrate)
        const state = this.RS232.open()
        if (state) {
            uni.showToast({ title: '232已打开', icon: 'none' })
            this.RS232.onStartAutoReadData((res) => {
                try {
                    let hex = this.RS232.byte2HexString(res)
                    this.handle232HexData(hex)
                } catch (e) {
                    this.addLog('232回调异常', e.message || e)
                }
            })
            this.startAutoTask()
        } else {
            uni.showToast({ title: '232打开失败', icon: 'error' })
            throw new Error('[重连] RS232 打开失败')
        }
    },

    stopRS485() {
        // this.stopHeartbeatIfNeeded()
        this.addLog('485通信', '串口关闭')
        if (this.RS485) {
            this.RS485.stopReadPortData()
            this.RS485.close()
        }
    },

    stopRS232() {
        if (this.RS232) {
            this.RS232.stopReadPortData()
            this.RS232.close()
        }
    },

    // ========== 数据轮询 & 心跳 ==========
    readData() {
        this.timer = setInterval(async () => {
            await cmd.getTemp()
            await delay(2000)
            await cmd.getPressure()
        }, 8000)
    },

    startHeartbeat() {
        if (this.heartbeatTimer) {
            clearInterval(this.heartbeatTimer)
            this.heartbeatTimer = null
        }
        this.addLog('485通信', '心跳检测已启动')
        this.heartbeatTimer = setInterval(() => {
            this.check485Heartbeat()
        }, 10000)
    },

    stopHeartbeatIfNeeded() {
        if (!this.heartbeatTimer) return
        clearInterval(this.heartbeatTimer)
        this.heartbeatTimer = null
        this.addLog('485通信', '心跳检测已停止')
    },

    // 检测485心跳
    check485Heartbeat() {
        if (!this.last485DataTime) {
            console.log('[心跳] 等待首次485数据...')
            return
        }
        const now = Date.now()
        const timeout = 45000

        if (now - this.last485DataTime > timeout) {
            if (this.reconnectCount >= this.maxReconnect) {
                this.addLog('485通信', '重连' + this.maxReconnect + '次失败，请检查硬件')
                uni.showToast({
                    title: '485通信中断，请检查硬件连接',
                    icon: 'none',
                    duration: 3000
                })
                return
            }

            this.addLog('485通信', '数据中断（第' + (this.reconnectCount + 1) + '次重连）')
            uni.showToast({
                title: '485通信中断，正在恢复...',
                icon: 'none',
                duration: 2000
            })

            this.resetSerialPorts()
        }
    },

    // ========== 统一重连 ==========
    async resetSerialPorts() {
        try {
            this.reconnectCount++

            // Step 1: 停止所有定时器
            if (this.heartbeatTimer) { clearInterval(this.heartbeatTimer); this.heartbeatTimer = null }
            if (this.timer) { clearInterval(this.timer); this.timer = null }
            if (this.taskTimer) { clearInterval(this.taskTimer); this.taskTimer = null }

            // Step 2: 停止两个串口
            if (this.RS485) { this.RS485.stopReadPortData(); this.RS485.close() }
            if (this.RS232) { this.RS232.stopReadPortData(); this.RS232.close() }

            // Step 3: 清空队列
            cmd.clearQueue()

            // Step 4: 等待端口释放（指数退避）
            const backoff = Math.min(1000 * Math.pow(2, this.reconnectCount - 1), 30000)
            const waitTime = Math.max(backoff, 2500)
            console.log(`[重连] 第${this.reconnectCount}次, 等待${waitTime}ms...`)
            await delay(waitTime)

            // Step 5: 重置时间戳
            this.last485DataTime = null

            // Step 6: 依次重启（失败时抛出异常触发重试）
            if (!this.startRS485()) {
                throw new Error('[重连] RS485 启动失败')
            }
            await delay(500)
            if (!this.startRS232()) {
                throw new Error('[重连] RS232 启动失败')
            }

            this.addLog('串口通信', `双串口重连完成（第${this.reconnectCount}次）`)
        } catch (error) {
            this.addLog('串口通信错误', error.message || '重置失败')
            await delay(5000)
            if (this.reconnectCount < this.maxReconnect) {
                this.resetSerialPorts()
            } else {
                this.addLog('串口通信', `重连${this.maxReconnect}次均失败，即将自动重启应用`)
                uni.showToast({ title: '通信异常，3秒后重启', icon: 'none', duration: 3000 })

                setTimeout(() => {
                    plus.runtime.restart()
                }, 3000)
            }
        }
    },

    // ========== 数据处理 ==========
    handle485HexData(hex) {
        this.last485DataTime = Date.now()

        let data = cmd.parse485Data(hex)
        if (data.hasOwnProperty('temp')) {
            store.state.sensor.temp = data.temp
        }
        if (data.hasOwnProperty('humi')) {
            store.state.sensor.humi = data.humi
        }
        if (data.hasOwnProperty('pressure')) {
            let pressure = parseFloat(data.pressure) + parseInt(store.state.run.pressureCom)
            store.state.sensor.pressure = pressure
        }

        // 门状态上报处理
        if (data.action == 'LeftDoor' && data.status == 'closed') {
            cmd.LeftDoor(false)
            uni.showToast({ title: '左门已关闭', icon: 'none' })
            this.addLog('左门触点触发', '左门已关闭')
        }
        if (data.action == 'RightDoor' && data.status == 'closed') {
            cmd.RightDoor(false)
            uni.showToast({ title: '右门已关闭', icon: 'none' })
            this.addLog('右门触点触发', '右门已关闭')
        }
        if (data.action == 'door' && data.status == 'closed') {
            try {
                cmd.LeftDoor(false)
                cmd.RightDoor(false)
                uni.showToast({ title: '两门已关闭', icon: 'none' })
            } catch (error) {
                this.addLog('门关闭错误', error.message || error)
            }
        }
    },

    handle232HexData(hex) {
        let data = cmd.parse232dData(hex)
        if (data === {}) return

        if (data.hasOwnProperty('number')) {
            uni.$emit('ic', data.number)

            if (store.state.relay.door == false) {
                // 门关闭状态
                this.checkPersonCard(data.number).then(res => {
                    if (res) {
                        uni.$emit('showDoorSelect', data.number)
                    } else {
                        this.checkEndoCard(data.number).then(res => {
                            if (res) {
                                uni.showToast({ title: '请先开门', icon: 'none' })
                            } else {
                                uni.showToast({ title: '无效卡片', icon: 'none' })
                            }
                        })
                    }
                })
            } else {
                // 门打开状态
                this.checkPersonCard(data.number).then(res => {
                    if (res) {
                        uni.$emit('showDoorSelect', data.number)
                    } else {
                        this.checkEndoCard(data.number).then(res => {
                            if (res) {
                                uni.$emit('showActionSelect', data.number)
                            } else {
                                uni.showToast({ title: '无效卡片', icon: 'none' })
                            }
                        })
                    }
                })
            }
        }
    },

    // ========== 业务任务定时器 ==========
    startAutoTask() {
        this.taskTimer = setInterval(() => {
            this.checkDoorOpenTimer()
            this.vacuumTask()
            this.disinfectTask()
            this.windCloseTask()
        }, 2000)
    },

    async disinfectTask() {
        let group = store.state.run.group
        let now = formatDateTime()
        let nowTime = now.split(' ')[1]
        let time = nowTime.substring(0, nowTime.length - 3)
        let isStart = false
        for (let i = 0; i < group.length; i++) {
            if (group[i].status) {
                let start = group[i].start.h + ':' + group[i].start.m
                let end = group[i].end.h + ':' + group[i].end.m
                if (compareTimes(start, time) == 1 && compareTimes(time, end) == 1) {
                    isStart = true
                    break
                }
            }
        }
        if (store.state.relay.disinfect == false && isStart == true) {
            cmd.Disinfect(true)
            await delay(100)
            cmd.Wind(true)
        }
        if (store.state.relay.disinfect == true && isStart == false && store.state.autoDisinfect == true) {
            cmd.Disinfect(false)
        }
    },

    async vacuumTask() {
        let start = store.state.timer.vacuumStart
        if (start != '') {
            let startM = getTimeDifference(start, formatDateTime())
            let runTime = store.state.run.vacuumRunTime
            if (startM.minutes >= runTime) {
                store.state.timer.vacuumStart = ''
                cmd.Vacuum(false)
            }
        }
        let end = store.state.timer.vacuumEnd
        if (end != '') {
            let endH = getTimeDifference(end, formatDateTime())
            let perHour = store.state.run.vacuumPerHour
            if (endH.hour >= perHour) {
                store.state.timer.vacuumEnd = ''
                cmd.Vacuum(true)
                await delay(100)
                cmd.Wind(true)
            }
        }
    },

    async windCloseTask() {
        await delay(100)
        let { light, vacuum, disinfect, door } = store.state.relay
        if (light || vacuum || disinfect || door) return
        if (store.state.sensor.temp > store.state.run.temp) return
        if (store.state.sensor.humi > store.state.run.humi) return
        cmd.Wind(false)
    },

    checkDoorOpenTimer() {
        let openTime = store.state.timer.door
        if (openTime != '' && store.state.clean == false) {
            let diff = getTimeDifference(formatDateTime(openTime), formatDateTime())
            if (diff.minutes > 3) {
                store.state.timer.doorAlert = true
                uni.$emit('notice', { title: '未关门', content: '请及时关闭' })
            }
        }   
    },

    // ========== 门事件 ==========
    async openDoorEvent() {
        await cmd.Light(true)
        await cmd.Vacuum(false)
        await cmd.Wind(true)
    },

    async closeDoorEvent() {
        await cmd.Light(false)
        await cmd.Vacuum(true)
        await cmd.Wind(true)
    },

    // ========== 卡片验证 ==========
    async checkPersonCard(ic) {
        let res1 = await db.selectDataList('user', { ic: ic })
        if (res1.length > 0) return true
        let res2 = await db.selectDataList('user', { ic2: ic })
        if (res2.length > 0) return true
        return false
    },

    async checkEndoCard(ic) {
        let res1 = await db.selectDataList('endo', { ic: ic })
        if (res1.length > 0) return true
        let res2 = await db.selectDataList('endo', { ic2: ic })
        if (res2.length > 0) return true
        return false
    },

    // ========== 日志 ==========
    async addLog(name, action) {
        try {
            await db.addTabItem('log', { name, action })
        } catch (error) {}
    },

    // ========== 内部初始化方法 ==========
    _initStorage() {
        let runStorage = storage.get('run')
        if (runStorage) {
            store.commit('SET_RUN', { ...runStorage })
        }
        let baseStorage = storage.get('base')
        if (baseStorage) {
            store.commit('SET_BASE', { ...baseStorage })
        }
        let config = storage.get('config')
        if (config) {
            store.state.apiUrl = 'http://' + config.ip + ':' + config.port
        }
    },

    _initTime() {
        store.state.time = formatDateTime()
        if (store.state.apiUrl != '') {
            Api.time().then(res => {
                if (res && Date.parse(res) != NaN) {
                    store.state.time = res
                    store.state.connect = true
                }
            })
        }
    },

    async _initDB() {
        await db.isTable('user').then(res => { if (!res) db.addUserTable() })
        await db.isTable('log').then(res => { if (!res) db.addLogTable() })
        await db.isTable('endo').then(res => { if (!res) db.addEndoTable() })
        let scope = await db.isTable('scope')
        if (!scope) {
            await db.addScopeTable()
            for (let i = 0; i < 16; i++) {
                await db.addTabItem('scope', { name: '', ic: '', key: i })
            }
        }
    },

    /**
     * 使用 store.watch 替代 Vue $watch
     * 监听器不绑定任何组件生命周期，随服务常驻内存
     */
    _initWatchers() {
        // 消毒状态监听
        store.watch(
            state => state.relay.disinfect,
            (newVal, oldVal) => {
                if (newVal == true) {
                    store.state.timer.disinfect = formatDateTime()
                }
                if (newVal == false) {
                    let timer = store.state.timer.disinfect
                    if (timer != '' && timer != null) {
                        let diff = getTimeDifference(timer, formatDateTime())
                        let local = storage.get('disinfectRun') ? storage.get('disinfectRun') : 0
                        storage.set('disinfectRun', diff.minutes + local)
                    }
                }
            }
        )
        // 风机状态监听
        store.watch(
            state => state.relay.wind,
            (newVal, oldVal) => {
                if (newVal == true && oldVal == false) {
                    store.state.timer.wind = formatDateTime()
                }
                if (newVal == false) {
                    let timer = store.state.timer.wind
                    if (timer != '' && timer != null) {
                        let diff = getTimeDifference(timer, formatDateTime())
                        let local = storage.get('windRun') ? storage.get('windRun') : 0
                        storage.set('windRun', diff.minutes + local)
                    }
                }
            }
        )
        // 湿度→风机
        store.watch(
            state => state.sensor.humi,
            (newVal) => {
                if (newVal > store.state.run.humi && store.state.relay.wind == false) {
                    cmd.Wind(true)
                }
            }
        )
        // 温度→风机
        store.watch(
            state => state.sensor.temp,
            (newVal) => {
                if (newVal > store.state.run.temp && store.state.relay.wind == false) {
                    cmd.Wind(true)
                }
            }
        )
        // 门状态监听
        store.watch(
            state => state.relay.door,
            (newVal, oldVal) => {
                if (newVal == true) {
                    this.openDoorEvent()
                    store.state.timer.door = formatDateTime()
                }
                if (newVal == false) {
                    this.closeDoorEvent()
                    this.addLog('门', '手动关门')
                    store.state.timer.door = ''
                    store.state.timer.doorAlert = false
                }
            }
        )
        // 开门报警
        store.watch(
            state => state.timer.doorAlert,
            (newVal, oldVal) => {
                if (newVal == true) beeper.play()
                if (newVal == false) beeper.stop()
            }
        )
        // 真空泵状态
        store.watch(
            state => state.relay.vacuum,
            (newVal, oldVal) => {
                if (newVal == true) {
                    store.state.timer.vacuumStart = formatDateTime()
                }
                if (newVal == false) {
                    store.state.timer.vacuumEnd = formatDateTime()
                }
            }
        )
    },
}

export default serialService