//
//  BindingViewModels.swift
//  Lookfit
//
//  Created by lemo. on 2020/3/21.
//  Copyright © 2020 Sheldon. All rights reserved.
//

import UIKit
import CoreBluetooth

class BindingViewModels: ViewModel {
    
    let connectState = PublishSubject<Bool>()
    let scanState = PublishSubject<Bool>()
    let scanTimeout = PublishSubject<Void>()
    let scanDevices = BehaviorRelay<[SectionModel<String, TableViewCellModel>]>.init(value: [SectionModel(model: MultiLanguageKey.scaning.localized, items: [])])
    var scanBleModels: [BLEModel] = []
    
    override init() {
        super.init()
        Bluetooth.shareInstance()!.delegate = self
        monitor()
    }
    
    private func monitor() {
        // 连接成功
        kNotificationCenter.rx.notification(Notification.Name(rawValue: BluetoothNotificationAtConnectSuccess))
            .subscribe(onNext: { [weak self] (notification) in
                self?.connectState.onNext(true)
                guard let bleModel = notification.object as? BLEModel else {
                    return
                }
                // 保存当前设备信息
                let deviceInfo = DeviceInfo(deviceName: bleModel.peripheral.name ?? "", UUIDString: bleModel.uuidString, MACString: bleModel.macString ?? "")
                UserDefaultsManager.saveDeviceInfo(deviceInfo: deviceInfo)
                // 发出绑定成功通知
                kNotificationCenter.post(name: NSNotification.Name(BindingDevice), object: bleModel)
            })
            .disposed(by: rx.disposeBag)
    }
    
    deinit {
        GCDTimer.shared.cancleTimer(WithTimerName: "connectedDevice")
        GCDTimer.shared.cancleTimer(WithTimerName: "scanDevice")
        Bluetooth.shareInstance()!.cancelScan()
    }
    
}

extension BindingViewModels {
    
    func startScan() {
        let state = Bluetooth.shareInstance()!.state.rawValue == 5
        if state {
            // 清空当前重新扫描
            scanBleModels.removeAll()
            // 超时处理
            GCDTimer.shared.scheduledDispatchTimer(WithTimerName: "scanDevice", timeInterval: 15, queue: .main, repeats: false, immediately: false) {
                if self.scanBleModels.count == 0 {
                    self.scanTimeout.onNext(())
                }
            }
            // 开启扫描
            Bluetooth.shareInstance()!.scan(forPeripheralsWithdiscoverServices: nil, isDFU: false)
        }
        scanState.onNext(state)
    }
    
    func connctDevice(bleModel: BLEModel) {
        let state = Bluetooth.shareInstance()!.state.rawValue == 5
        if !state {
            self.connectState.onNext(false)
            return
        }
        // 连接设备
        Bluetooth.shareInstance()!.connected(with: bleModel)
        // 超时处理
        GCDTimer.shared.scheduledDispatchTimer(WithTimerName: "connectedDevice", timeInterval: 15, queue: .main, repeats: false, immediately: false) {
            self.connectState.onNext(false)
        }
    }
    
}

extension BindingViewModels: BluetoothDelegate {
    
    func onDiscover(toPeripheralsBleModel bleModel: BLEModel!) {
        guard let _ = bleModel.peripheral.name else {
            return
        }
        // 替换重复设备
        var isAdd = false
        for (index, oldModel) in scanBleModels.enumerated() {
            if (oldModel.macString == bleModel.macString && oldModel.peripheral.name == bleModel.peripheral.name) || oldModel.uuidString == bleModel.uuidString {
                scanBleModels[index] = bleModel
                isAdd = true
                break
            }
        }
        if isAdd == false {
            scanBleModels.append(bleModel)
        }
        // 处理蓝牙信号强度量为正数127的问题
        if let rssi = bleModel.rssi, rssi.intValue > 0 {
            bleModel.rssi = NSNumber(value: -bleModel.rssi.intValue)
        }
        var items: [TableViewCellModel] = []
        scanBleModels.enumerated().forEach { (offset, tempBleModel) in
            let isBottomLine = offset != scanBleModels.count - 1
            let rssiText = tempBleModel.rssi.intValue != 0 ? "\(tempBleModel.rssi.intValue)" : ""
            let cellModel = TableViewCellModel(title: tempBleModel.peripheral.name ?? "", isSwitch: false, description: tempBleModel.macString, isArrows: false, isOn: false, image: R.image.icon_device(), isBottomLine: isBottomLine, righeImg: nil, rightBottomText: rssiText)
            items.append(cellModel)
        }
        let sectionModel = SectionModel(model: MultiLanguageKey.scaning.localized, items: items)
        scanDevices.accept([sectionModel])
        GCDTimer.shared.cancleTimer(WithTimerName: "scanDevice")
    }
    
}