package learn.kotlin.com.androidopencv;

import android.annotation.TargetApi;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Build;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;


public class MainActivity extends AppCompatActivity {

    private static final String TAG = "AndroidOpenCv";
    private Button mFaceRearCameraButton;
    private Button mFaceFrontCameraButton;
    private Button mGrayCameraButton;
    private Button mImageButton;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            if (!hasPermissions(PERMISSIONS)) {
                requestPermissions(PERMISSIONS, PERMISSIONS_REQUEST_CODE);
            }
        }
        mFaceRearCameraButton = findViewById(R.id.rear_camera);
        mFaceFrontCameraButton = findViewById(R.id.front_camera);
        mGrayCameraButton = findViewById(R.id.gray_camera);
        mImageButton = findViewById(R.id.edge_detection_btn);

        mFaceRearCameraButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MainActivity.this, CameraActivity.class);
                intent.putExtra("mode", 0);
                startActivity(intent);
            }
        });

        mFaceFrontCameraButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MainActivity.this, CameraActivity.class);
                intent.putExtra("mode", 1);
                startActivity(intent);
            }
        });

        mGrayCameraButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MainActivity.this, CameraActivity.class);
                intent.putExtra("mode", 2);
                startActivity(intent);
            }
        });

        mImageButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MainActivity.this, ImageActivity.class);
                startActivity(intent);
            }
        });
    }

    @Override
    public void onPause() {
        super.onPause();
    }

    @Override
    public void onResume() {
        super.onResume();
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
    }

    // permission
    static final int PERMISSIONS_REQUEST_CODE = 1000;
    String[] PERMISSIONS = {"android.permission.CAMERA", "android.permission.READ_EXTERNAL_STORAGE"};


    private boolean hasPermissions(String[] permissions) {
        int result;
        for (String perms : permissions) {
            result = ContextCompat.checkSelfPermission(this, perms);
            if (result == PackageManager.PERMISSION_DENIED) {
                return false;
            }
        }
        return true;
    }

    // 불필요
    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions,
                                           @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);

        switch (requestCode) {
            case PERMISSIONS_REQUEST_CODE:
                if (grantResults.length > 0) {
                    boolean isPermission = grantResults[0] == PackageManager.PERMISSION_GRANTED;

                    if (!isPermission) {
                        showDialogForPermission("실행을 위해 권한 허가가 필요합니다.");
                    }
                }
                break;
        }
    }


    @TargetApi(Build.VERSION_CODES.M)
    private void showDialogForPermission(String msg) {
        AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
        builder.setTitle("알림");
        builder.setMessage(msg);
        builder.setCancelable(false);
        builder.setPositiveButton("예", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int id) {
                requestPermissions(PERMISSIONS, PERMISSIONS_REQUEST_CODE);
            }
        });
        builder.setNegativeButton("아니오", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface arg0, int arg1) {
                finish();
            }
        });
        builder.create().show();
    }


}