package st.wow.git.passgo;

import java.lang.Runnable;
import android.os.Build;
import android.os.Environment;
import android.os.Handler;
import android.content.Context;
import android.util.Log;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.content.Intent;
import android.Manifest;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.provider.Settings;
import android.view.View;

// Requests the storage permissions the app needs to read the password
// store in shared storage. On Android 11+ (API 30+) the
// MANAGE_EXTERNAL_STORAGE ("All files access") permission cannot be
// requested with a dialog; the user must toggle it in the system
// settings, so we launch that settings screen directly for this app.
public class Permissions extends Fragment {
	Context ctx;
	Handler handler;
	final int PERMISSIONS_REQUEST = 1;

	public Permissions(View view) {
		Log.d("passgo", "Permissions()");
		this.ctx = view.getContext();
		this.handler = new Handler(this.ctx.getMainLooper());
		Permissions inst = this;
		handler.post(new Runnable() {
			public void run() {
				Activity act = (Activity)ctx;
				FragmentTransaction ft = act.getFragmentManager().beginTransaction();
				ft.add(inst, "Permissions");
				ft.commitNow();
			}
		});
	}

	@Override
	public void onAttach(Context context) {
	    super.onAttach(context);
	    Log.d("passgo", "Permissions onAttach()");

	    if (!(context instanceof Activity)) {
	        Log.w("passgo", "Context is not an Activity");
	        return;
	    }

	    Activity activity = (Activity) context;

	    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.R) {
	        if (context.checkSelfPermission(Manifest.permission.READ_EXTERNAL_STORAGE)
	                != PackageManager.PERMISSION_GRANTED) {
	            requestPermissions(
	                    new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},
	                    PERMISSIONS_REQUEST
	            );
	        }
	    }

	    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R
	            && !Environment.isExternalStorageManager()) {
	        Log.d("passgo", "Requesting all files access");
	        Intent intent = new Intent(
	                Settings.ACTION_MANAGE_APP_ALL_FILES_ACCESS_PERMISSION,
	                Uri.parse("package:" + activity.getPackageName())
	        );
	        if (intent.resolveActivity(activity.getPackageManager()) != null) {
	            startActivity(intent);
	        } else {
	            Intent fallback = new Intent(Settings.ACTION_MANAGE_ALL_FILES_ACCESS_PERMISSION);
	            if (fallback.resolveActivity(activity.getPackageManager()) != null) {
	                startActivity(fallback);
	            } else {
	                Log.e("passgo", "No activity found for all files access settings");
	            }
	        }
	    }
	}

	@Override public void onActivityResult(int requestCode, int resultCode, Intent data) {
		Log.d("passgo", "Permissions onActivityResult(" + requestCode + "): " + resultCode);
		super.onActivityResult(requestCode, resultCode, data);
	}
}