Learn-Genie/Learn Genie/View Controller/AudioIntroductionViewController.swift

//
//  AudioIntroductionViewController.swift
//  Learn Genie
//
//  Created by Suraj Kumar Mandal on 30/08/21.
//

import UIKit
import RealmSwift
import AVFoundation
import SideMenu

class AudioIntroductionViewController: UIViewController {
    
    @IBOutlet var navigationBar: UINavigationBar!
    @IBOutlet var speechProgressSlider: UISlider!
    
    let translation = DBManager.sharedInstance.database.objects(TopicModel.self)
    var topicName = ""
    var topicId = Int()
    var textContent = String()
    var languageCode = ""
    
    // Synth object
    let synth = AVSpeechSynthesizer()
    // Utterance object
    var theUtterance = AVSpeechUtterance(string: "")
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // Do any additional setup after loading the view.
        synth.delegate = self
        speechProgressSlider.minimumValue = 0
        speechProgressSlider.isUserInteractionEnabled = false
    }
    
    override func viewWillAppear(_ animated: Bool) {
        navigationBar.topItem?.title = Helper.translateText(inputText: topicName)
        //getLanguageCode()
        getTopic()
    }
    
    func getLanguageCode() {
        let selectedLanguage = UserDefaultsConstant.getValueFromUserDefults(for: "selectedLanguageName")
        let path = Bundle.main.path(forResource: "AVSpeechSynthesizerLanguageList", ofType: "plist")
        let dict = NSDictionary(contentsOfFile: path!)
        languageCode = dict!.object(forKey: selectedLanguage!) as! String
        print(languageCode)
    }
    
    func getTopic() {
        for item in translation {
            if topicName == item.name {
                topicId = item.id
                self.getHtmlData()
            } else {
                //self.view.makeToast("No topic found!")
            }
        }
    }
    
    func getHtmlData() {
        let selectedLanguage = UserDefaultsConstant.getValueFromUserDefults(for: "selectedLanguageName") as! String
        let unZipDestination = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0]
        let languageFolderUrl = unZipDestination.appendingPathComponent(selectedLanguage)
        let unZipUrl = languageFolderUrl.appendingPathComponent("\(topicId)")
        let contentUrl = unZipUrl.appendingPathComponent("content")
        let indexUrl = contentUrl.appendingPathComponent("index.html")
        print("Index Url: \(indexUrl)")
        
        //let url = URL(string: link)
        do {
            let contents = try String(contentsOf: indexUrl)
            print(contents.htmlToString)
            textContent = contents.htmlToString
        } catch {
            // contents could not be loaded
        }
    }
    
    
    /*
     // MARK: - Navigation
     
     // In a storyboard-based application, you will often want to do a little preparation before navigation
     override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
     // Get the new view controller using segue.destination.
     // Pass the selected object to the new view controller.
     }
     */
    
    @IBAction func menuNavAction(_ sender: Any) {
        let menu = storyboard!.instantiateViewController(withIdentifier: "SideMenuNavigationController") as! SideMenuNavigationController
        present(menu, animated: true, completion: nil)

    }
    
    @IBAction func headerNavigation(_ sender: UIButton) {
        switch sender.tag {
        case 0:
            DispatchQueue.main.async {
                let introVC = self.storyboard?.instantiateViewController(withIdentifier: "IntroductionViewController") as! IntroductionViewController
                introVC.topicName = self.topicName
                self.navigationController?.pushViewController(introVC, animated: false)
            }
            break
        case 1:
            DispatchQueue.main.async {
                let videoVC = self.storyboard?.instantiateViewController(withIdentifier: "VideoIntroductionViewController") as! VideoIntroductionViewController
                videoVC.topicName = self.topicName
                self.navigationController?.pushViewController(videoVC, animated: false)
            }
        case 2:
            DispatchQueue.main.async {
                let audioVC = self.storyboard?.instantiateViewController(withIdentifier: "AudioIntroductionViewController") as! AudioIntroductionViewController
                audioVC.topicName = self.topicName
                self.navigationController?.pushViewController(audioVC, animated: false)
            }
        default:
            break
        }
    }
    
    @IBAction func playButtonAction(_ sender: UIButton) {
        
        switch sender.tag {
        case 0:
            // Getting text to read from the UITextView (textView).
            let selectedLanguage = UserDefaultsConstant.getValueFromUserDefults(for: "selectedLanguageName") as! String
            if selectedLanguage == "English" {
                theUtterance = AVSpeechUtterance(string: textContent)
                theUtterance.voice = AVSpeechSynthesisVoice(language: "en-GB")
            } else if selectedLanguage == "Hindi" {
                theUtterance = AVSpeechUtterance(string: textContent)
                theUtterance.voice = AVSpeechSynthesisVoice(language: "hi-IN")
            } else {
                theUtterance = AVSpeechUtterance(string: textContent)
                theUtterance.voice = AVSpeechSynthesisVoice(language: "en-GB")
            }
            theUtterance.rate = 0.5
            synth.speak(theUtterance)
        case 1:
            synth.continueSpeaking();
        case 2:
            synth.pauseSpeaking(at: AVSpeechBoundary.immediate)
        default:
            synth.continueSpeaking();
        }
//        // The resume functionality
//        if (synth.isPaused) {
//            sender.setImage(UIImage(named: "pause"), for: .normal)
//            synth.continueSpeaking();
//        }
//        // The pause functionality
//        else if (synth.isSpeaking) {
//            sender.setImage(UIImage(named: "resume"), for: .normal)
//            synth.pauseSpeaking(at: AVSpeechBoundary.immediate)
//        }
//        // The start functionality
//        else if (!synth.isSpeaking) {
//            // Getting text to read from the UITextView (textView).
//            let selectedLanguage = UserDefaultsConstant.getValueFromUserDefults(for: "selectedLanguageName") as! String
//            if selectedLanguage == "English" {
//                theUtterance = AVSpeechUtterance(string: textContent)
//                theUtterance.voice = AVSpeechSynthesisVoice(language: "en-GB")
//            } else if selectedLanguage == "Hindi" {
//                theUtterance = AVSpeechUtterance(string: textContent)
//                theUtterance.voice = AVSpeechSynthesisVoice(language: "hi-IN")
//            } else {
//                theUtterance = AVSpeechUtterance(string: textContent)
//                theUtterance.voice = AVSpeechSynthesisVoice(language: "en-GB")
//            }
//            theUtterance.rate = 0.5
//            synth.speak(theUtterance)
//        }
    }
    
}

extension AudioIntroductionViewController: AVSpeechSynthesizerDelegate {
    func speechSynthesizer(_ synthesizer: AVSpeechSynthesizer, willSpeakRangeOfSpeechString characterRange: NSRange, utterance: AVSpeechUtterance) {
        let progress = Float(characterRange.location + characterRange.length)
                           / Float(utterance.speechString.count)
        //print(progress)
        self.speechProgressSlider.setValue(progress,
                                      animated: true)
    }
    
    func speechSynthesizer(_ synthesizer: AVSpeechSynthesizer, didFinish utterance: AVSpeechUtterance) {
        print("finished")
        self.speechProgressSlider.setValue(0,
                                      animated: true)
    }
}