//
//  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()
        
        styleDetailLayout()
        
        lblFrek.numberOfLines = 0
        lblFrek.lineBreakMode = .byWordWrapping
        lblFrek.sizeToFit()
        
        lblNamaPerangkat.numberOfLines = 0
        lblPerusahaan.numberOfLines = 0
        lblModel.numberOfLines = 0
        lblAcuan.numberOfLines = 0
        
        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() {
                self.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)
        }
    }
    private func styleDetailLayout() {
        resultLayout.backgroundColor = UIColor(red: 247/255, green: 249/255, blue: 252/255, alpha: 1.0)
        
        // Style contentLayout container
        contentLayout.backgroundColor = .clear
        contentLayout.layer.borderWidth = 0
        contentLayout.layer.shadowColor = UIColor.clear.cgColor
        
        // Highlight Certificate Number & Key Titles
        lblNoSertifikat.font = UIFont.systemFont(ofSize: 17, weight: .bold)
        lblNoSertifikat.textColor = UIColor.siraniPrimaryBlue
        
        lblTanggalSertifikat.font = UIFont.systemFont(ofSize: 13, weight: .medium)
        lblTanggalSertifikat.textColor = UIColor.siraniTextSecondary
        
        lblPerusahaan.font = UIFont.systemFont(ofSize: 14, weight: .bold)
        lblPerusahaan.textColor = UIColor.siraniTextPrimary
        lblPerusahaan.numberOfLines = 0
        
        lblNamaPerangkat.font = UIFont.systemFont(ofSize: 14, weight: .bold)
        lblNamaPerangkat.textColor = UIColor.siraniTextPrimary
        lblNamaPerangkat.numberOfLines = 0
        
        lblAcuan.numberOfLines = 0
        lblAcuan.lineBreakMode = .byWordWrapping
        
        lblFrek.numberOfLines = 0
        lblFrek.lineBreakMode = .byWordWrapping
        
        let valueLabels: [UILabel?] = [lblPlgId, lblMerk, lblModel, lblImei, lblPabrikan, lblNegara, lblAcuan, lblFrek]
        for lbl in valueLabels {
            lbl?.font = UIFont.systemFont(ofSize: 13, weight: .semibold)
            lbl?.textColor = UIColor.siraniTextPrimary
        }
        
        // Style each section card and inner value containers
        for section in contentLayout.subviews {
            section.backgroundColor = .white
            section.layer.cornerRadius = 16
            section.layer.borderWidth = 1
            section.layer.borderColor = UIColor(red: 228/255, green: 235/255, blue: 245/255, alpha: 1.0).cgColor
            section.layer.shadowColor = UIColor.black.cgColor
            section.layer.shadowOffset = CGSize(width: 0, height: 2)
            section.layer.shadowRadius = 8
            section.layer.shadowOpacity = 0.05
            section.layer.masksToBounds = false
            
            for subview in section.subviews {
                if let label = subview as? UILabel {
                    if !valueLabels.compactMap({ $0 }).contains(label),
                       label != lblNoSertifikat,
                       label != lblTanggalSertifikat,
                       label != lblPerusahaan,
                       label != lblNamaPerangkat {
                        label.font = UIFont.systemFont(ofSize: 11, weight: .bold)
                        label.textColor = UIColor(red: 120/255, green: 135/255, blue: 155/255, alpha: 1.0)
                    }
                } else if !(subview is UILabel) {
                    // Inner value box container
                    subview.backgroundColor = UIColor(red: 248/255, green: 250/255, blue: 254/255, alpha: 1.0)
                    subview.layer.cornerRadius = 10
                    subview.layer.borderWidth = 1
                    subview.layer.borderColor = UIColor(red: 235/255, green: 240/255, blue: 248/255, alpha: 1.0).cgColor
                    subview.layer.masksToBounds = true
                }
            }
        }
    }
}

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) {
        lblNoSertifikat.text = resultQrCode.lic_no.isEmpty ? "-" : resultQrCode.lic_no
        lblTanggalSertifikat.text = CommonHelper.formatDate(from: resultQrCode.lic_date)
        lblPlgId.text = resultQrCode.cust_id == 0 ? "-" : String(resultQrCode.cust_id)
        lblPerusahaan.text = resultQrCode.pmh_name.isEmpty ? "-" : resultQrCode.pmh_name
        lblNamaPerangkat.text = resultQrCode.eqp_name.isEmpty ? "-" : resultQrCode.eqp_name
        lblMerk.text = resultQrCode.merk.isEmpty ? "-" : resultQrCode.merk
        lblModel.text = resultQrCode.model.isEmpty ? "-" : resultQrCode.model
        
        let imei = resultQrCode.imei.trimmingCharacters(in: .whitespacesAndNewlines)
        lblImei.text = (imei.isEmpty || imei == "null") ? "-" : imei
        
        let pabrikan = resultQrCode.mfc_name.trimmingCharacters(in: .whitespacesAndNewlines)
        lblPabrikan.text = (pabrikan.isEmpty || pabrikan == "null") ? "-" : pabrikan
        
        let negara = resultQrCode.negara.trimmingCharacters(in: .whitespacesAndNewlines)
        lblNegara.text = (negara.isEmpty || negara == "null") ? "-" : negara
        
        // Format Acuan Regulasi neatly
        lblAcuan.attributedText = formatAcuanRegulasi(raw: resultQrCode.acuan)
        
        // Format Frequency data cleanly into structured sections
        lblFrek.attributedText = formatStructuredFrequency(raw: resultQrCode.eqp_frek)
    }
    
    private func formatAcuanRegulasi(raw: String) -> NSAttributedString {
        let trimmed = raw.trimmingCharacters(in: .whitespacesAndNewlines)
        if trimmed.isEmpty || trimmed == "null" || trimmed == "-" {
            return NSAttributedString(string: "-", attributes: [
                .font: UIFont.systemFont(ofSize: 13, weight: .regular),
                .foregroundColor: UIColor.siraniTextSecondary
            ])
        }
        
        let items = trimmed.components(separatedBy: ",").map { $0.trimmingCharacters(in: .whitespacesAndNewlines) }.filter { !$0.isEmpty }
        let paragraphStyle = NSMutableParagraphStyle()
        paragraphStyle.lineSpacing = 4
        paragraphStyle.paragraphSpacing = 6
        
        let result = NSMutableAttributedString()
        for (index, item) in items.enumerated() {
            let bulletStr = (index == 0 ? "" : "\n") + "📜  \(item)"
            let attr = NSAttributedString(string: bulletStr, attributes: [
                .font: UIFont.systemFont(ofSize: 12, weight: .semibold),
                .foregroundColor: UIColor(red: 35/255, green: 45/255, blue: 60/255, alpha: 1.0),
                .paragraphStyle: paragraphStyle
            ])
            result.append(attr)
        }
        return result
    }
    
    private func formatStructuredFrequency(raw: String) -> NSAttributedString {
        var text = raw
        if text.contains("<") && text.contains(">") {
            text = text.replacingOccurrences(of: "<br\\s*/?>", with: "\n", options: .regularExpression)
            text = text.replacingOccurrences(of: "</(tr|p|li)>", with: "\n", options: .regularExpression)
            text = text.replacingOccurrences(of: "<[^>]+>", with: "", options: .regularExpression)
        }
        text = text.trimmingCharacters(in: .whitespacesAndNewlines)
        
        if text.isEmpty || text == "null" || text == "-" {
            return NSAttributedString(string: "-", attributes: [
                .font: UIFont.systemFont(ofSize: 13, weight: .regular),
                .foregroundColor: UIColor.siraniTextSecondary
            ])
        }
        
        // Insert clean section breaks before radio band names if it is a run-on block
        let bandBreakPattern = "(?i)(?<=[^\\n])\\s+(?=(?:Bluetooth|WLAN|NFC|RFID|GSM|WCDMA|LTE|5G|Radar|UWB|SRD|LoRa|Zigbee|DVB)\\b)"
        text = text.replacingOccurrences(of: bandBreakPattern, with: "\n\n", options: .regularExpression)
        
        let sections = text.components(separatedBy: "\n\n").map { $0.trimmingCharacters(in: .whitespacesAndNewlines) }.filter { !$0.isEmpty }
        
        let fullAttr = NSMutableAttributedString()
        
        for (sIdx, sectionText) in sections.enumerated() {
            if sIdx > 0 {
                fullAttr.append(NSAttributedString(string: "\n\n"))
            }
            
            // Format each section
            // Check if it matches: Protocol + Frekuensi + Daya Pancar
            var bandTitle = ""
            var frekVal = ""
            var powerVal = ""
            
            // Regex to extract Protocol, Frekuensi range, and Daya Pancar
            let pattern = "^(Bluetooth|WLAN[^\nFrekuensi]*|[A-Z0-9- ]+?)?\\s*(?:Frekuensi\\s*:?\\s*)?([0-9.]+\\s*[kMG]Hz\\s*-\\s*[0-9.]+\\s*[kMG]Hz)?\\s*(?:(?:Bluetooth|WLAN[^ ]*|[A-Z0-9]+)?\\s*Daya\\s*Pancar\\s*:?\\s*)?([<>]?\\s*[0-9.]+\\s*m?Watt)?"
            
            if let regex = try? NSRegularExpression(pattern: pattern, options: [.caseInsensitive]),
               let match = regex.firstMatch(in: sectionText, options: [], range: NSRange(location: 0, length: sectionText.utf16.count)) {
                
                if let r1 = Range(match.range(at: 1), in: sectionText) {
                    bandTitle = String(sectionText[r1]).trimmingCharacters(in: .whitespacesAndNewlines)
                }
                if let r2 = Range(match.range(at: 2), in: sectionText) {
                    frekVal = String(sectionText[r2]).trimmingCharacters(in: .whitespacesAndNewlines)
                }
                if let r3 = Range(match.range(at: 3), in: sectionText) {
                    powerVal = String(sectionText[r3]).trimmingCharacters(in: .whitespacesAndNewlines)
                }
            }
            
            if !bandTitle.isEmpty && (!frekVal.isEmpty || !powerVal.isEmpty) {
                // Render as structured radio card
                let icon = bandTitle.lowercased().contains("wlan") ? "📶" : (bandTitle.lowercased().contains("bluetooth") ? "📻" : "📡")
                
                let titleAttr = NSAttributedString(string: "\(icon)  \(bandTitle)\n", attributes: [
                    .font: UIFont.systemFont(ofSize: 13, weight: .bold),
                    .foregroundColor: UIColor.siraniPrimaryBlue
                ])
                fullAttr.append(titleAttr)
                
                let detailPara = NSMutableParagraphStyle()
                detailPara.lineSpacing = 3
                detailPara.paragraphSpacing = 2
                
                if !frekVal.isEmpty {
                    let frekAttr = NSAttributedString(string: "    • Frekuensi: \(frekVal)\n", attributes: [
                        .font: UIFont.systemFont(ofSize: 12, weight: .medium),
                        .foregroundColor: UIColor(red: 40/255, green: 50/255, blue: 65/255, alpha: 1.0),
                        .paragraphStyle: detailPara
                    ])
                    fullAttr.append(frekAttr)
                }
                
                if !powerVal.isEmpty {
                    let powerAttr = NSAttributedString(string: "    • Daya Pancar: \(powerVal)", attributes: [
                        .font: UIFont.systemFont(ofSize: 12, weight: .medium),
                        .foregroundColor: UIColor(red: 90/255, green: 105/255, blue: 125/255, alpha: 1.0),
                        .paragraphStyle: detailPara
                    ])
                    fullAttr.append(powerAttr)
                }
            } else {
                // Fallback: render each line with a bullet
                let lines = sectionText.components(separatedBy: "\n").map { $0.trimmingCharacters(in: .whitespacesAndNewlines) }.filter { !$0.isEmpty }
                let genericPara = NSMutableParagraphStyle()
                genericPara.lineSpacing = 3
                
                for (lIdx, line) in lines.enumerated() {
                    if lIdx > 0 { fullAttr.append(NSAttributedString(string: "\n")) }
                    let bulletLine = "•  \(line)"
                    let lineAttr = NSAttributedString(string: bulletLine, attributes: [
                        .font: UIFont.systemFont(ofSize: 12, weight: .medium),
                        .foregroundColor: UIColor(red: 40/255, green: 50/255, blue: 65/255, alpha: 1.0),
                        .paragraphStyle: genericPara
                    ])
                    fullAttr.append(lineAttr)
                }
            }
        }
        
        return fullAttr
    }
    
    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
                    }
                    
                }
            }
        }
    }
    
}