MDT5_1_Ueberwachungssystem_G1/app/src/main/java/com/example/ueberwachungssystem/Detection/Detector.java

package com.example.ueberwachungssystem.Detection;

import android.os.CountDownTimer;

import androidx.annotation.NonNull;
import androidx.camera.core.ExperimentalGetImage;


abstract public class Detector {
    private OnDetectionListener listener;
    private boolean isDetecting = false;
    private boolean extendViolation = false;

    // Countdown parameters
    private final int COUNTDOWN_TIME = 10000;          // milliseconds
    private final int COUNTDOWN_POLLING_TIME = 100;   // milliseconds

    /** Constructor - takes context of current activity */
    public Detector() {}


    /** On Detection Listener - runs when violation is reported */
    public interface OnDetectionListener {
        void onDetection(@NonNull DetectionReport detectionReport);
    }
    public void setOnDetectionListener(@NonNull OnDetectionListener listener) {
        this.listener = listener;
    }

    /** Triggers onDetectionListener - call this to trigger violation/alarm */
    public void reportViolation(String detectionType, float amplitude) {
        if (listener != null) {
            if (!isDetecting) {
                isDetecting = true;
                DetectionReport detectionReport = new DetectionReport(true, detectionType, amplitude);
                listener.onDetection(detectionReport);
                startDetectionTimer(detectionType, amplitude);
            } else {
                extendViolation = true;
            }
        } else {
            isDetecting = false;
            extendViolation = false;
        }
    }

    private void startDetectionTimer(String detectionType, float amplitude) {
        isDetecting = true;
        new CountDownTimer((long) COUNTDOWN_TIME, COUNTDOWN_POLLING_TIME) {
            @Override
            public void onTick(long millisUntilFinished) {
                if (extendViolation) {
                    extendViolation = false;
                    startDetectionTimer(detectionType, amplitude);
                    this.cancel();
                }
            }
            @Override
            public void onFinish() {
                isDetecting = false;
                DetectionReport detectionReport = new DetectionReport(false, detectionType, amplitude);
                listener.onDetection(detectionReport);
            }
        }.start();
    }

    public void extendViolation(){
        this.extendViolation = true;
    }

    /** Starts Detection (abstract method: needs to be overridden in child class) */
    public abstract void startDetection();

    /** Stops Detection (abstract method: needs to be overridden in child class) */
    public abstract void stopDetection();
}