//
//  MainViewController.swift
//  ApartaApp
//
//  Created by Berkay Sarıpınar on 17.10.2023.
//

import UIKit
import CoreData
import SwiftQRScanner

class MainViewController: UIViewController, UITableViewDelegate, UITableViewDataSource, NSFetchedResultsControllerDelegate {
    
    var fetchedResultsController: NSFetchedResultsController<DeviceEntity>!
    
    @IBOutlet weak var tableView: UITableView!
    
    let addButton: UIButton = {
        let button = UIButton()
        button.backgroundColor = .red
        button.layer.cornerRadius = 25
        button.layer.masksToBounds = true
        button.setImage(UIImage(systemName: "plus"), for: .normal)
        button.tintColor = .white
        button.translatesAutoresizingMaskIntoConstraints = false
        return button
    }()
    
    override func viewDidLoad() {
        super.viewDidLoad()
       // addTestData()
        tableView.delegate = self
        tableView.dataSource = self
        
        // Butonu ekle
        view.addSubview(addButton)
        
        // Butonun pozisyonunu ve boyutunu ayarla
        NSLayoutConstraint.activate([
            addButton.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -25),
            addButton.bottomAnchor.constraint(equalTo: view.bottomAnchor, constant: -50),
            addButton.widthAnchor.constraint(equalToConstant: 50),
            addButton.heightAnchor.constraint(equalToConstant: 50)
        ])
        
        // "+" işaretini butonun ortasına yerleştirelim
        if let titleSize = addButton.titleLabel?.frame.size {
            let imageInset = (addButton.frame.size.height - titleSize.height) / 2
            //addButton.titleEdgeInsets = UIEdgeInsets(top: imageInset, left: -imageInset, bottom: -imageInset, right: imageInset)
            
        }
        
        // Butona tıklandığında çağrılacak fonksiyonu belirle
        addButton.addTarget(self, action: #selector(scanQRCode), for: .touchUpInside)
        
        // Core Data için fetchedResultsController'ı ayarla
        setupFetchedResultsController()
        
        fetchDevices()
    }
    
    func setupFetchedResultsController() {
        let fetchRequest: NSFetchRequest<DeviceEntity> = DeviceEntity.fetchRequest()
        let sortDescriptor = NSSortDescriptor(key: "name", ascending: true)
        fetchRequest.sortDescriptors = [sortDescriptor]
        
        fetchedResultsController = NSFetchedResultsController(
            fetchRequest: fetchRequest,
            managedObjectContext: CoreDataStack.shared.context,
            sectionNameKeyPath: nil,
            cacheName: nil
        )
        fetchedResultsController.delegate = self
        
        do {
            try fetchedResultsController.performFetch()
        } catch {
            print("Error fetching devices: \(error)")
        }
    }
    
    func fetchDevices() {
        do {
            try fetchedResultsController.performFetch()
            tableView.reloadData()
        } catch {
            print("Error fetching devices: \(error)")
        }
    }
    
    @objc func addButtonTapped() {
        // Buraya yeni cihaz ekleme ekranına geçiş kodunu ekleyebiliriz
    }
    
    // MARK: - TableView DataSource ve Delegate Metotları
    
    func numberOfSections(in tableView: UITableView) -> Int {
        return fetchedResultsController.sections?.count ?? 0
    }
    
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return fetchedResultsController.sections?[section].numberOfObjects ?? 0
    }
    
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "deviceCell", for: indexPath) as! DeviceCell
        configureCell(cell, at: indexPath)
        return cell
    }
    
    func configureCell(_ cell: DeviceCell, at indexPath: IndexPath) {
        let device = fetchedResultsController.object(at: indexPath)
        cell.deviceNameLabel.text = device.name
        cell.deviceIDLabel.text = device.id
    }
    
    // MARK: - NSFetchedResultsControllerDelegate Metotları
    
    func controllerWillChangeContent(_ controller: NSFetchedResultsController<NSFetchRequestResult>) {
        tableView.beginUpdates()
    }
    
    func controllerDidChangeContent(_ controller: NSFetchedResultsController<NSFetchRequestResult>) {
        tableView.endUpdates()
    }
    
    func controller(_ controller: NSFetchedResultsController<NSFetchRequestResult>,
                    didChange sectionInfo: NSFetchedResultsSectionInfo,
                    atSectionIndex sectionIndex: Int,
                    for type: NSFetchedResultsChangeType) {
        let indexSet = IndexSet(integer: sectionIndex)
        switch type {
        case .insert:
            tableView.insertSections(indexSet, with: .fade)
        case .delete:
            tableView.deleteSections(indexSet, with: .fade)
        default:
            break
        }
    }
    
    func controller(_ controller: NSFetchedResultsController<NSFetchRequestResult>,
                    didChange anObject: Any,
                    at indexPath: IndexPath?,
                    for type: NSFetchedResultsChangeType,
                    newIndexPath: IndexPath?) {
        switch type {
        case .insert:
            tableView.insertRows(at: [newIndexPath!], with: .fade)
        case .delete:
            tableView.deleteRows(at: [indexPath!], with: .fade)
        case .update:
            if let cell = tableView.cellForRow(at: indexPath!) as? DeviceCell {
                configureCell(cell, at: indexPath!)
            }
        case .move:
            tableView.moveRow(at: indexPath!, to: newIndexPath!)
        }
    }
    //MARK: QR CODE SCANNER
    @objc func scanQRCode(_ sender: Any) {
        
       // QRCode scanner without Camera switch and Torch
        let scanner = QRCodeScannerController()
        
        //QRCode with Camera switch and Torch
        /*let scanner = QRCodeScannerController(cameraImage: UIImage(named: "camera"), cancelImage: UIImage(named: "cancel"), flashOnImage: UIImage(named: "flash-on"), flashOffImage: UIImage(named: "flash-off"))*/
        scanner.delegate = self
        self.present(scanner, animated: true, completion: nil)
        let storyboard = UIStoryboard(name: "Main", bundle: nil)
        let addDeviceViewController = storyboard.instantiateViewController(withIdentifier: "AddDeviceViewController") as! AddDeviceViewController
    }
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
   /* func addTestData() {
        let device1 = DeviceEntity(context: CoreDataStack.shared.context)
        device1.name = "Cihaz 1"
        device1.id = "AABB000001"

        let device2 = DeviceEntity(context: CoreDataStack.shared.context)
        device2.name = "Cihaz 2"
        device2.id = "AABB000002"

        // Diğer cihazlar...

        CoreDataStack.shared.saveContext()
    }*/ // Test verileri CoreData
    func processQRCode(_ qrCode: String) {
        // QR kodunun uygun formatta olup olmadığını kontrol et
        guard qrCode.hasPrefix("www.abc.com?id=") else {
               // Hatalı format, kullanıcıya uyarı ver veya işlemi iptal et
               // Örneğin:
               print("Hatalı QR kod formatı")
               return
           }
           
           // Uygun formatta ise id kısmını çek
           let idString = qrCode.replacingOccurrences(of: "www.abc.com?id=", with: "")
        
        // Şimdi bu id'yi kullanarak yeni cihaz ekleme ekranına yönlendir
        // Ekranı modally açabilir veya Navigation Controller kullanarak push yapabilirsin
        let addDeviceViewController = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "AddDeviceViewController") as! AddDeviceViewController
        
        // İlgili verileri yeni ekranın view controller'ına iletebilirsin
        addDeviceViewController.qrCodeID = idString
        
        // Ekranı göster
        performSegue(withIdentifier: "addDeviceVC", sender: nil)
    }

}

extension MainViewController: QRScannerCodeDelegate {
    func qrScannerDidFail(_ controller: UIViewController, error: SwiftQRScanner.QRCodeError) {
        
    }
    
    func qrScanner(_ controller: UIViewController, scanDidComplete result: String) {
        print("result:\(result)")
        processQRCode(result)
    }
    
    func qrScannerDidFail(_ controller: UIViewController, error: String) {
        print("error:\(error)")
    }
    
    func qrScannerDidCancel(_ controller: UIViewController) {
        print("SwiftQRScanner did cancel")
    }
}