//
//  DeviceDetailViewController.swift
//  pocloud
//
//  Created by Patrick McDonagh on 5/24/18.
//  Copyright © 2018 patrickjmcd. All rights reserved.
//

import UIKit
import Alamofire
import PromiseKit
import RealmSwift
import SwiftyJSON
import SVProgressHUD
import FirebaseDatabase
import ChameleonFramework

class DeviceDetailViewController: UITableViewController {
    let realm = try! Realm()
    var ref: DatabaseReference!
    let baseURL = (UIApplication.shared.delegate as! AppDelegate).baseURL
    let user = (UIApplication.shared.delegate as! AppDelegate).user
    
    var thisDevice : Device?
    var deviceTypes : Results<DeviceType>?
    var selectedChannel : Channel?
    
    var channelLookup : [String : Int] = [:]
    var values : [String : MeshifyValue] = [:]
    var updatedChannelNames : [String] = [String]()
    var changedChannelNames : [String] = [String]()
    let numFormatter = NumberFormatter()

    override func viewDidLoad() {
        super.viewDidLoad()
        
        self.tableView.estimatedRowHeight = 44
        self.tableView.rowHeight = UITableViewAutomaticDimension
        
        ref = Database.database().reference()
        let macAddress = String((thisDevice?.macAddress.replacingOccurrences(of: ":", with: "").uppercased().dropLast(4))!)
        let deviceTypeName = (thisDevice?.parentDeviceType.first?.name)!
        
        numFormatter.minimumFractionDigits = 0
        numFormatter.maximumFractionDigits = 3
        numFormatter.minimumIntegerDigits = 1
        
        SVProgressHUD.show()
        firstly {
            loadData()
        }.done { _ in
            self.tableView.reloadData()
        }.catch{ error in
            print("Error in loadData: \(error)")
        }
        
        
        
        self.navigationItem.title = thisDevice?.vanityName
        
        self.refreshControl = UIRefreshControl()
        refreshControl?.attributedTitle = NSAttributedString(string: "Pull to refresh")
        refreshControl?.addTarget(self, action: #selector(refresh), for: UIControlEvents.valueChanged)
//        tableView.addSubview(refreshControl!)
        
        firstly {
            getChannels(deviceTypeId: thisDevice!.deviceTypeId, baseURL: baseURL, authToken: (user?.authToken)!)
        }.then { _ in
            getChannelValues(deviceId: self.thisDevice!.id, baseURL: self.baseURL, authToken: (self.user?.authToken)!)
        }.done { (valueDict) in
            self.values = valueDict
            self.tableView.reloadData()
            SVProgressHUD.dismiss()
            if let dev = self.thisDevice {
                for chanIndex in 0..<dev.values.count {
                    let chanName = dev.values[chanIndex].name
                    self.channelLookup[chanName] = chanIndex
                }
            }
            self.getFirebaseDeviceValues(deviceMacAddress: macAddress, deviceTypeName: deviceTypeName)
        }.catch { error in
            print("Error fetching data in DeviceDetailViewController: \(error)")
        }
        
    }
    
    override func viewWillDisappear(_ animated: Bool) {
        Database.database().reference().removeAllObservers()
    }
    
    func getFirebaseDeviceValues(deviceMacAddress : String, deviceTypeName : String) {
//        let getVals = Database.database().reference().child("devices")
//            .child(deviceMacAddress)
//            .child(deviceTypeName)
//            .child("channels")
//            .observe(.value) { snapshot in
//                let snapValue = snapshot.value as! NSDictionary
//
//
//                let chanVal = MeshifyValue()
//                chanVal.name = (value["name"] as? String)!
//                chanVal.timestamp = Int((value["timestamp"] as? String)!)!
//                chanVal.value = (value["value"] as? String)!
//                self.values[chanVal.name] = chanVal
//                print("should set \(chanVal.value) as \(chanVal.name)")
//                self.updatedChannelNames.append(chanVal.name)
//                self.tableView.reloadData()
//        }
//        Database.database().reference().removeObserver(withHandle: getVals)
        
        Database.database().reference().child("devices")
            .child(deviceMacAddress)
            .child(deviceTypeName)
            .child("channels")
            .observe(.childChanged) { snapshot in
                let value = snapshot.value as! NSDictionary
                let chanVal = MeshifyValue()
                
                if let name = value["name"] as? String {
                    chanVal.name = name
                }
                
                if let timestamp = value["timestamp"] as? String {
                    chanVal.timestamp = Int(Double(timestamp)!)
                }
                
                if let readValue = value["value"] as? String {
                    chanVal.value = readValue
                }
                
                let prevChanValue = self.values[chanVal.name]?.value
                if prevChanValue != chanVal.value {
                    self.changedChannelNames.append(chanVal.name)
                } else {
                    self.updatedChannelNames.append(chanVal.name)
                }
                self.values[chanVal.name] = chanVal
                self.tableView.reloadData()
        }
        
    }
    
    
    @objc func refresh() {
        updatedChannelNames.removeAll()
        changedChannelNames.removeAll()
        SVProgressHUD.show()
        firstly {
            getChannels(deviceTypeId: thisDevice!.deviceTypeId, baseURL: baseURL, authToken: (user?.authToken)!)
            }.then { _ in
                getChannelValues(deviceId: self.thisDevice!.id, baseURL: self.baseURL, authToken: (self.user?.authToken)!)
            }.done { _ in
                self.tableView.reloadData()
                SVProgressHUD.dismiss()
                self.refreshControl?.endRefreshing()
            }.catch { error in
                print("Error fetching data in DeviceDetailViewController: \(error)")
        }
    }
    
    func tryRound(value : String, places numberOfPlaces: Int) -> String {
        if let doubledValue = Double(value) {
            if let formattedString = numFormatter.string(from: NSNumber(value: doubledValue)) {
                return formattedString
            } else {
                return value
            }
        } else {
            return value
        }
    }



    // MARK: - Table view data source

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
//        return (thisDevice?.parentDeviceType.first?.channels.count)!
        return values.count
    }
    
    
    // MARK: - Table View Delegate Method
    
    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "deviceDetailCell", for: indexPath) as! DeviceDetailChannelCell
        cell.channelNameLabel?.text = thisDevice?.parentDeviceType.first?.channels[indexPath.row].subTitle
        
        let chanName = thisDevice?.parentDeviceType.first?.channels[indexPath.row].name
        let chanVal = values[chanName!]
        
        
        if let i = changedChannelNames.index(of: chanName!) {
            changedChannelNames.remove(at: i)
            cell.backgroundColor = UIColor.flatLime()
            DispatchQueue.main.asyncAfter(deadline: .now() + 5) {
                UIView.animate(withDuration: 1, animations: {
                    cell.backgroundColor = UIColor.white
                })
                
            }
        }
        
        if let i = updatedChannelNames.index(of: chanName!) {
            updatedChannelNames.remove(at: i)
            cell.backgroundColor = UIColor.flatYellow()
            DispatchQueue.main.asyncAfter(deadline: .now() + 5) {
                UIView.animate(withDuration: 1, animations: {
                    cell.backgroundColor = UIColor.white
                })
                
            }
        }
        
        cell.channelValueLabel?.text = tryRound(value: chanVal!.value, places: 3)
        cell.accessoryType = .disclosureIndicator
        return cell
    }
    
    //MARK : - Table Cell Selected
    
    override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        selectedChannel = thisDevice?.parentDeviceType.first?.channels[indexPath.row]
        performSegue(withIdentifier: "goToChannelView", sender: self)
    }
    
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if segue.identifier == "goToChannelView" {
            let destinationVC = segue.destination as! ChannelDetailViewController
            destinationVC.thisDevice = thisDevice!
            destinationVC.thisChannel = selectedChannel!
            
        }
    }
    
    func loadData() -> Promise<Void> {
        return Promise { promise in
            deviceTypes = realm.objects(DeviceType.self)
            thisDevice = realm.objects(Device.self).filter("id == %d", thisDevice!.id).first!
            promise.fulfill(())
        }
    }



}