//
//  DeviceListViewController.swift
//  pocloud
//
//  Created by Patrick McDonagh on 5/23/18.
//  Copyright © 2018 patrickjmcd. All rights reserved.
//

import UIKit
import Alamofire
import PromiseKit
import SwiftyJSON
import RealmSwift
import SVProgressHUD
import FirebaseAuth

class DeviceListViewController: UITableViewController {
    @IBOutlet weak var searchBar: UISearchBar!
    let realm = try! Realm()
    
    let user = (UIApplication.shared.delegate as! AppDelegate).user
    let dataFilePath = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first?.appendingPathComponent("Auth.plist")
    let appAuth = AppAuth()
    
    var addresses : Results<Address>?
    var gateways : Results<Gateway>?
    var devices : Results<Device>?
    var deviceTypes : Results<DeviceType>?
    let baseURL = (UIApplication.shared.delegate as! AppDelegate).baseURL
    let deviceTypeFilter = NSPredicate(format: "devices.@count > 0 AND NOT name IN %@", ["gen", "mainHP", "M1"])
    let ignoreDeviceTypes = ["M1", "Gateway"]
    
    var selectedDevice: Device?

    override func viewDidLoad() {
        super.viewDidLoad()
        
        self.refreshControl = UIRefreshControl()
        refreshControl?.attributedTitle = NSAttributedString(string: "Pull to refresh")
        refreshControl?.addTarget(self, action: #selector(refresh), for: UIControlEvents.valueChanged)
        
        searchBar.delegate = self
        
        
        
        navigationItem.leftBarButtonItem = UIBarButtonItem(title: "Log Out", style: .plain, target: self, action: #selector(self.logOut))
        
        SVProgressHUD.show()
        firstly {
            self.loadRealmData()
        }.then{ _ in
            self.loadJSONData()
        }.done { _ in
            self.tableView.reloadData()
            SVProgressHUD.dismiss()
        }.catch { error in
            print("Error in getting data in DeviceListViewController: \(error)")
        }
    }
    
    @objc func logOut(){
        appAuth.logOut()
        navigationController?.popToRootViewController(animated: true)
    }
    
    func loadJSONData() -> Promise<Void>{
        return Promise { promise in
            firstly {
                getDeviceTypes(baseURL: self.baseURL, authToken: self.user!.authToken)
            }.then { _ in
                getCompanies(baseURL: self.baseURL, authToken: self.user!.authToken)
            }.then { _ in
                getAddresses(baseURL: self.baseURL, authToken: self.user!.authToken)
            }.then { _  in
                getGateways(baseURL: self.baseURL, authToken: self.user!.authToken)
            }.then { _  in
                getDevices(baseURL: self.baseURL, authToken: self.user!.authToken)
            }.done{ _ in
                promise.fulfill(())
            }.catch { error in
                promise.reject(error)
            }
            
        }
        
    }
    
    func getUniqueDeviceTypeNames() -> [String]{
        var deviceTypeNames : [String] = [String]()
        if let devicesList = devices {
            for d in devicesList {
                if let deviceParent = d.parentDeviceType.first {
                    deviceTypeNames.append(deviceParent.vanityName)
                }
            }
        }
        
        return deviceTypeNames.reduce([], { initialValue, collectionElement in
            initialValue.contains(collectionElement) ? initialValue : initialValue + [collectionElement]
        })
        .filter({ (name) -> Bool in
            !self.ignoreDeviceTypes.contains(name)
        })
    }
    
    @objc func refresh() {

        SVProgressHUD.show()
        self.realm.refresh()
        firstly {
            self.loadJSONData()
        }.done { _ in
            self.tableView.reloadData()
            self.refreshControl?.endRefreshing()
            SVProgressHUD.dismiss()
        }.catch { error in
                print("Error in getting data in DeviceListViewController: \(error)")
        }

    }
    
    // MARK: - Table view data source

    override func numberOfSections(in tableView: UITableView) -> Int {
        return getUniqueDeviceTypeNames().count
    }

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        let uniqueDeviceTypes = getUniqueDeviceTypeNames()
        let deviceTypesWithDevices = devices?.filter("ANY parentDeviceType.vanityName == %@", uniqueDeviceTypes[section])
        return deviceTypesWithDevices?.count ?? 0
    }
    
    override func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
        return getUniqueDeviceTypeNames()[section]
    }
    
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if segue.identifier == "openDeviceDetailView" {
            let destinationVC = segue.destination as! DeviceDetailViewController
            destinationVC.thisDevice = selectedDevice!
        }
    }

    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "deviceListCell", for: indexPath)
        let uniqueDeviceTypes = getUniqueDeviceTypeNames()
        let deviceTypesWithDevices = devices?.filter("ANY parentDeviceType.vanityName == %@", uniqueDeviceTypes[indexPath.section]).sorted(byKeyPath: "vanityName")
        if (deviceTypesWithDevices?.count)! > 0 {
            cell.textLabel?.text = deviceTypesWithDevices?[indexPath.row].vanityName
            cell.accessoryType = .disclosureIndicator
        }
        return cell
    }
    
    override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        let uniqueDeviceTypes = getUniqueDeviceTypeNames()
        let deviceTypesWithDevices = devices?.filter("ANY parentDeviceType.vanityName == %@", uniqueDeviceTypes[indexPath.section]).sorted(byKeyPath: "vanityName")
//        let deviceTypesWithDevices = deviceTypes?.filter(deviceTypeFilter)
//        if let thisSection = deviceTypesWithDevices?[indexPath.section] {
//            selectedDevice = thisSection.devices[indexPath.row]
            selectedDevice = deviceTypesWithDevices?[indexPath.row]
            performSegue(withIdentifier: "openDeviceDetailView", sender: self)
//        }
    }
    
    
    //MARK: - Realm Functions
    
    func loadRealmData() -> Promise<Void> {
        return Promise { promise in
            devices = realm.objects(Device.self)
            deviceTypes = realm.objects(DeviceType.self)
            gateways = realm.objects(Gateway.self)
            addresses = realm.objects(Address.self)
            promise.fulfill(())
        }
    }

}

extension DeviceListViewController : UISearchBarDelegate {
    func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
        devices = devices?.filter("vanityName CONTAINS[cd] %@", searchBar.text!).sorted(byKeyPath: "vanityName", ascending: true)
        tableView.reloadData()
    }
    
    func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
        if searchBar.text?.count == 0 {
            firstly {
                self.loadRealmData()
            }.then{ _ in
                self.loadJSONData()
            }.done { _ in
                self.tableView.reloadData()
                
                DispatchQueue.main.async {
                    searchBar.resignFirstResponder()
                }
            }.catch { error in
                print("Error in getting data in DeviceListViewController: \(error)")
            }
        }
    }
    
}