package com.nus.app1;

import android.Manifest;
import android.app.Activity;
import android.content.Intent;
import android.content.pm.PackageManager;

import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.os.StrictMode;
import android.provider.MediaStore;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;

import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;

import java.io.File;
import java.text.SimpleDateFormat;
import java.util.Date;

public class CameraActivity extends Activity
{
    private static final int PERMISSION_REQUEST_CODE = 1;
    ImageView iv;
    Button btncapture;
    private Uri file;

    public void onCreate(Bundle b)
    {
        StrictMode.VmPolicy.Builder builder = new StrictMode.VmPolicy.Builder();
        StrictMode.setVmPolicy(builder.build());
        super.onCreate(b);
        setContentView(R.layout.cameralayout);
        iv=findViewById(R.id.iv);
        btncapture=findViewById(R.id.btncapture);
        btncapture.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(checkPermission())
                {
                    takePicture();
                }
                else
                {
                    requestPermission();
                }
            }
        });
    }
    private boolean checkPermission()
    {
        int camerapermission = ContextCompat.checkSelfPermission(getApplicationContext(), Manifest.permission.CAMERA);
        int storagepermission = ContextCompat.checkSelfPermission(getApplicationContext(), Manifest.permission.WRITE_EXTERNAL_STORAGE);
        if (camerapermission == PackageManager.PERMISSION_GRANTED && storagepermission ==PackageManager.PERMISSION_GRANTED)
        {
            return true;
        }
        else
        {
            return false;
        }
    }
    private void requestPermission()
    {
        ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.CAMERA,Manifest.permission.WRITE_EXTERNAL_STORAGE}, PERMISSION_REQUEST_CODE);
    }
    public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults)
    {
        switch (requestCode)
        {
            case PERMISSION_REQUEST_CODE:
                if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED && grantResults[1] == PackageManager.PERMISSION_GRANTED)
                {
                    Toast.makeText(getApplicationContext(),"Permission accepted", Toast.LENGTH_LONG).show();
                    takePicture();
                }
                else
                {
                    Toast.makeText(getApplicationContext(),"Permission denied", Toast.LENGTH_LONG).show();
                }
        }
    }

    public void takePicture() {
        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        file = Uri.fromFile(getOutputMediaFile());
        intent.putExtra(MediaStore.EXTRA_OUTPUT, file);

        startActivityForResult(intent, 100);
    }
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (requestCode == 100) {
            if (resultCode == RESULT_OK) {
                iv.setImageURI(file);
            }
        }
    }
    private static File getOutputMediaFile(){
        File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(
                Environment.DIRECTORY_PICTURES), "CameraDemo");

        if (!mediaStorageDir.exists()){
            if (!mediaStorageDir.mkdirs()){
                return null;
            }
        }

        String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
        return new File(mediaStorageDir.getPath() + File.separator +
                "IMG_"+ timeStamp + ".jpg");
    }
}