//
//  QRScannerVC.swift
//  Sirani
//
//  Created by Anhar Solehudin on 10/04/19.
//  Copyright © 2019 Anhar Solehudin. All rights reserved.
//

import UIKit
import AVFoundation

class QRScannerVC: UIViewController {
    
    // Outlets
    @IBOutlet weak var scannerView: UIView!
    @IBOutlet weak var overlayTop: UIView!
    @IBOutlet weak var overlayLeft: UIView!
    @IBOutlet weak var overlayRight: UIView!
    @IBOutlet weak var overlayBottom: UIView!
    @IBOutlet weak var btnCloseScanner: UIButton!
    @IBOutlet weak var resultLayout: UIView!
    @IBOutlet weak var contentLayout: UIView!
    @IBOutlet weak var lblNoSertifikat: UILabel!
    @IBOutlet weak var lblTanggalSertifikat: UILabel!
    @IBOutlet weak var lblPlgId: UILabel!
    @IBOutlet weak var lblPerusahaan: UILabel!
    @IBOutlet weak var lblNamaPerangkat: UILabel!
    @IBOutlet weak var lblMerk: UILabel!
    @IBOutlet weak var lblModel: UILabel!
    @IBOutlet weak var lblImei: UILabel!
    @IBOutlet weak var lblPabrikan: UILabel!
    @IBOutlet weak var lblNegara: UILabel!
    @IBOutlet weak var lblAcuan: UILabel!
    @IBOutlet weak var lblFrek: UILabel!
    @IBOutlet weak var lblPower: UILabel!
    @IBOutlet weak var progressLoadingLayout: UIView!
    @IBOutlet weak var progressLoading: UIActivityIndicatorView!
    
    private var captureSession = AVCaptureSession()
    private var videoPreviewLayer: AVCaptureVideoPreviewLayer?
    private var qrCodeFrameView: UIView?
    private var dataCaptured = false
    
    private let supportedCodeTypes = [
        AVMetadataObject.ObjectType.upce,
        AVMetadataObject.ObjectType.code39,
        AVMetadataObject.ObjectType.code39Mod43,
        AVMetadataObject.ObjectType.code93,
        AVMetadataObject.ObjectType.code128,
        AVMetadataObject.ObjectType.ean8,
        AVMetadataObject.ObjectType.ean13,
        AVMetadataObject.ObjectType.aztec,
        AVMetadataObject.ObjectType.pdf417,
        AVMetadataObject.ObjectType.itf14,
        AVMetadataObject.ObjectType.dataMatrix,
        AVMetadataObject.ObjectType.interleaved2of5,
        AVMetadataObject.ObjectType.qr
    ]
    
    // Initialize
    private var presenter: QRScannerPresenter = QRScannerPresenter(siraniApiServices: SiraniApiServices())
    
    // Constant Values
    private let alertNoConnectionTitle = "Informasi"
    private let alertNoConnectionMsg = "Sepertinya Anda sedang tidak tersambung pada koneksi internet"
    private let alertNoConnectionActionYes = "OK"
    
    // variables
    private var loading = false
    var kode : Int?
    var isSertifikatNew = false
    var isSertifikatPublic = false
    var isLabel = false
    
    // View Lifecycles
    override var preferredStatusBarStyle: UIStatusBarStyle {
        return .lightContent
    }
    
    override func viewWillAppear(_ animated: Bool) {
        AppUtility.lockOrientation(.portrait)
        
        if let kode = self.kode {
            onQrDataAvailable(decodedString: "\(kode)")
            dataCaptured = true
        }
        
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        contentLayout.layer.borderWidth = 1
        contentLayout.layer.borderColor = #colorLiteral(red: 0.0171101559, green: 0.3341715932, blue: 0.704000771, alpha: 1)
        
        presenter.attachView(view: self)
        
        dataCaptured = false
        
        // scanner view
        // Get the back-facing camera for capturing videos
        let deviceDiscoverySession = AVCaptureDevice.DiscoverySession(deviceTypes: [.builtInWideAngleCamera], mediaType: AVMediaType.video, position: .back)
        
        guard let captureDevice = deviceDiscoverySession.devices.first else {
            print("Failed to get the camera device")
            return
        }
        
        do {
            // Get an instance of the AVCaptureDeviceInput class using the previous device object.
            let input = try AVCaptureDeviceInput(device: captureDevice)
            
            // Set the input device on the capture session.
            captureSession.addInput(input)
            
            // Initialize a AVCaptureMetadataOutput object and set it as the output device to the capture session.
            let captureMetadataOutput = AVCaptureMetadataOutput()
            captureSession.addOutput(captureMetadataOutput)
            
            // Set delegate and use the default dispatch queue to execute the call back
            captureMetadataOutput.setMetadataObjectsDelegate(self, queue: DispatchQueue.main)
//            captureMetadataOutput.metadataObjectTypes = supportedCodeTypes
            captureMetadataOutput.metadataObjectTypes = [AVMetadataObject.ObjectType.qr]
            
        } catch {
            // If any error occurs, simply print it out and don't continue any more.
            print(error)
            return
        }
        
        // Initialize the video preview layer and add it as a sublayer to the viewPreview view's layer.
        videoPreviewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
        videoPreviewLayer?.videoGravity = AVLayerVideoGravity.resizeAspectFill
        videoPreviewLayer?.frame = scannerView.layer.bounds
        scannerView.layer.addSublayer(videoPreviewLayer!)
        
        // Start video capture.
        captureSession.startRunning()
        
        // bring scanner controller views
        scannerView.bringSubviewToFront(overlayTop)
        scannerView.bringSubviewToFront(overlayLeft)
        scannerView.bringSubviewToFront(overlayRight)
        scannerView.bringSubviewToFront(overlayBottom)
        scannerView.bringSubviewToFront(btnCloseScanner)
        
        // Initialize QR Code Frame to highlight the QR code
        qrCodeFrameView = UIView()
        
        if let qrCodeFrameView = qrCodeFrameView {
            qrCodeFrameView.layer.borderColor = UIColor.green.cgColor
            qrCodeFrameView.layer.borderWidth = 2
            scannerView.addSubview(qrCodeFrameView)
            scannerView.bringSubviewToFront(qrCodeFrameView)
        }
    }
    
    override func viewWillDisappear(_ animated: Bool) {
        AppUtility.lockOrientation(.all)
    }
    
    override func viewDidDisappear(_ animated: Bool) {
        presenter.detachView()
    }

    
    // private function
    private func loadData(code: String) {
        if !loading {
            if ConnectionHelper.isConnectedToNetwork() {
                presenter.loadData(code: code)
            } else {
                showNoConnection()
            }
        }
    }
    
    private func onQrDataEmpty() {
        resultLayout.show()
        scannerView.hide()
        
        DispatchQueue.main.asyncAfter(deadline: .now() + 0.8) {
            self.setEmptyQrCode()
        }
    }
    
    private func onQrDataAvailable(decodedString: String) {
        resultLayout.show()
        scannerView.hide()
        
        DispatchQueue.main.asyncAfter(deadline: .now() + 0.8) {
            self.loadData(code: decodedString)
        }
    }
    
    // Actions
    @IBAction func onBtnBackTap(_ sender: Any) {
        if(kode != nil)
        {
            if(isSertifikatNew){
                performSegue(withIdentifier: "unwindToSertifikatSegueId", sender: self)
            }else if(isSertifikatPublic){
                performSegue(withIdentifier: "unwindToSertifikatPublicSegueId", sender: self)
            }else if(isLabel){
                performSegue(withIdentifier: "unwindToLabelSegueId", sender: self)
            }else{
                performSegue(withIdentifier: "unwindToDaftarSertifikatSegueId", sender: self)
            }
        }
        else
        {
            performSegue(withIdentifier: "unwindToScanQrSegueId", sender: self)
        }
    }
    
    @IBAction func onBtnCloseScannerTap(_ sender: Any) {
        if(kode != nil)
        {
            if(isSertifikatNew){
                performSegue(withIdentifier: "unwindToSertifikatSegueId", sender: self)
            }else if(isSertifikatPublic){
                performSegue(withIdentifier: "unwindToSertifikatPublicSegueId", sender: self)
            }else{
                performSegue(withIdentifier: "unwindToDaftarSertifikatSegueId", sender: self)
            }
        }
        else
        {
            performSegue(withIdentifier: "unwindToScanQrSegueId", sender: self)
        }
    }
    
}

extension QRScannerVC: QRScannerViewDelegate {
    func showNoConnection() {
        let alertNoConnection = UIAlertController(
            title: alertNoConnectionTitle,
            message: alertNoConnectionMsg,
            preferredStyle: .alert
        )
        alertNoConnection.addAction(
            UIAlertAction(title: alertNoConnectionActionYes, style: .default, handler: nil)
        )
        self.present(alertNoConnection, animated: true, completion: nil)
    }
    
    func showLoading() {
        loading = true
        progressLoading.startAnimating()
        progressLoadingLayout.show()
    }
    
    func hideLoading() {
        loading = false
        progressLoading.stopAnimating()
        progressLoadingLayout.hide()
    }
    
    func setResulQrCode(resultQrCode: ResultQrCode) {
        var tglSert = ""
        if (resultQrCode.lic_date == "null" || resultQrCode.lic_date.isEmpty) {
            tglSert = ""
        } else {
            let inputFormatter = DateFormatter()
            inputFormatter.dateFormat = "yyyy-MM-dd"
            let expDateString = String(resultQrCode.lic_date.prefix(10))
            
            if let output = inputFormatter.date(from: expDateString) {
                let outputFormatter = DateFormatter()
                outputFormatter.dateFormat = "dd MMMM yyyy"
                tglSert = outputFormatter.string(from: output)
            }
        }
        
        lblNoSertifikat.text = resultQrCode.lic_no
        lblTanggalSertifikat.text = tglSert
        lblPlgId.text = String(resultQrCode.cust_id)
        lblPerusahaan.text = resultQrCode.pmh_name
        lblNamaPerangkat.text = resultQrCode.eqp_name
        lblMerk.text = resultQrCode.merk
        lblModel.text = resultQrCode.model
        lblImei.text = resultQrCode.imei
        lblPabrikan.text = resultQrCode.mfc_name
        lblNegara.text = resultQrCode.negara
        lblAcuan.text = resultQrCode.acuan
        lblFrek.text = resultQrCode.eqp_frek
        lblPower.text = resultQrCode.eqp_power
    }
    
    func setEmptyQrCode() {
        let alertNoConnection = UIAlertController(
            title: "Informasi",
            message: "Data tidak ditemukan",
            preferredStyle: .alert
        )
        alertNoConnection.addAction(
            UIAlertAction(title: "OK", style: .default, handler: nil)
        )
        self.present(alertNoConnection, animated: true, completion: nil)
    }
    
}

extension QRScannerVC: AVCaptureMetadataOutputObjectsDelegate {
    
    func metadataOutput(_ output: AVCaptureMetadataOutput, didOutput metadataObjects: [AVMetadataObject], from connection: AVCaptureConnection) {
        
        if !dataCaptured {
            print("TEST SCAN")
            print(metadataObjects.count)
            print(metadataObjects)
            
            // Check if the metadataObjects array is not nil and it contains at least one object.
            if metadataObjects.count == 0 {
                onQrDataEmpty()
                dataCaptured = true
                return
            }
            
            // Get the metadata object.
            let metadataObj = metadataObjects[0] as! AVMetadataMachineReadableCodeObject
            
            if supportedCodeTypes.contains(metadataObj.type) {
                // If the found metadata is equal to the QR code metadata (or barcode) then update the status label's text and set the bounds
                let barCodeObject = videoPreviewLayer?.transformedMetadataObject(for: metadataObj)
                qrCodeFrameView?.frame = barCodeObject!.bounds
                
                if metadataObj.stringValue != nil {
                    if let url = URL(string: metadataObj.stringValue ?? "") {
                        let lic_id = url.lastPathComponent
                        
                        onQrDataAvailable(decodedString: lic_id)
                        dataCaptured = true
                    }
                    
                }
            }
        }
    }
    
}