##錄音

import Foundation
import AVFoundation

enum AudioSessionMode{
    case reocrd
    case play
}

class RecordHelper:NSObject, AVAudioRecorderDelegate{

    var audioRecorder:AVAudioRecorder?
    var audioPlayer:AVAudioPlayer?
    var isRecording = false


    override init() {
        super.init()
        // init an audio recorder
        //錄音檔名
        let fileName = "User.wav"
        //檔案總目錄
        let path = NSHomeDirectory() + "/Documents" + fileName
        let url = URL(fileURLWithPath: path)
        let recordSettings:[String:Any] = [
            //錄音品質
            AVEncoderAudioQualityKey:AVAudioQuality.min.rawValue,
            AVEncoderBitRateKey:16,
            AVNumberOfChannelsKey:2,
            //取樣品質
            AVSampleRateKey:44100.0
        ]

        do {
            self.audioRecorder =  try AVAudioRecorder(url: url, settings: recordSettings)
            self.audioRecorder?.delegate = self

        } catch {
            print(error.localizedDescription)
        }

    }


    //音訊工作階段
    func settingAudioSession(mode:AudioSessionMode){
        //取得音訊工作階段
        let session = AVAudioSession.sharedInstance()
        do {
            switch mode {
            case .reocrd:
                try session.setCategory(AVAudioSessionCategoryPlayAndRecord)
            case .play:
                try session.setCategory(AVAudioSessionCategoryPlayback)
                try session.setActive(false)
            }
        } catch{
            print(error.localizedDescription)
        }
    }


    func recordAudio() {
        settingAudioSession(mode: .reocrd)
        self.audioRecorder?.prepareToRecord()
        self.audioRecorder?.record()
        isRecording = true
    }

    func stopAudio() {
        self.audioRecorder?.stop()
        isRecording = false
        settingAudioSession(mode: .play)
    }

    func playAudio() {
        if isRecording == false {
            self.audioPlayer?.stop()
            self.audioPlayer?.currentTime = 0.0
            self.audioPlayer?.play()
        }
    }

    func stopPlayAudio() {
        if isRecording == false {
            self.audioPlayer?.stop()
            self.audioPlayer?.currentTime = 0.0
        }
    }



    func audioRecorderDidFinishRecording(_ recorder: AVAudioRecorder, successfully flag: Bool) {
        if flag == true {
            do {
                self.audioPlayer =  try AVAudioPlayer(contentsOf: recorder.url)
            } catch {
                print(error.localizedDescription)
            }
        }
    }




}