package com.bumptech.glide.samples.gallery;

import android.Manifest.permission;
import android.annotation.TargetApi;
import android.content.pm.PackageManager;
import android.os.Build;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.content.ContextCompat;
import android.widget.Toast;
import com.bumptech.glide.MemoryCategory;

/**
 * Displays a {@link HorizontalGalleryFragment}.
 */
public class MainActivity extends FragmentActivity {

  private static final int REQUEST_READ_STORAGE = 0;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main_activity);
    GlideApp.get(this).setMemoryCategory(MemoryCategory.HIGH);
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M
        && ContextCompat.checkSelfPermission(this, permission.READ_EXTERNAL_STORAGE)
        != PackageManager.PERMISSION_GRANTED) {
      requestStoragePermission();
    } else {
      replaceFragment();
    }
  }

  @TargetApi(Build.VERSION_CODES.JELLY_BEAN)
  private void requestStoragePermission() {
     ActivityCompat.requestPermissions(this,
        new String[]{permission.READ_EXTERNAL_STORAGE},
        REQUEST_READ_STORAGE);
  }

  private void replaceFragment() {
    Fragment fragment = new HorizontalGalleryFragment();
    getSupportFragmentManager()
        .beginTransaction()
        .replace(R.id.fragment_container, fragment)
        .commit();
  }

  @Override
  public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions,
      @NonNull int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    switch (requestCode) {
      case REQUEST_READ_STORAGE: {
        // If request is cancelled, the result arrays are empty.
        if (grantResults.length > 0
            && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
          replaceFragment();
        } else {
          Toast.makeText(this, "Storage permission is required", Toast.LENGTH_LONG)
              .show();
          requestStoragePermission();
        }
      }
    }
  }
}
