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package org.solovyev.android;

import android.app.DialogFragment;
import android.app.Fragment;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;

public class Fragments {

	protected Fragments() {
		throw new AssertionError();
	}

	public static void showDialog(@Nonnull DialogFragment dialogFragment,
								  @Nonnull String fragmentTag,
								  @Nonnull FragmentManager fm) {
		final FragmentTransaction ft = fm.beginTransaction();

		Fragment prev = fm.findFragmentByTag(fragmentTag);
		if (prev != null) {
			ft.remove(prev);
		}
		ft.addToBackStack(null);

		// Create and show the dialog.
		dialogFragment.show(ft, fragmentTag);
	}

	public static void showDialog(@Nonnull android.support.v4.app.DialogFragment dialogFragment,
								  @Nonnull String fragmentTag,
								  @Nonnull android.support.v4.app.FragmentManager fm) {
		final android.support.v4.app.FragmentTransaction ft = fm.beginTransaction();

		android.support.v4.app.Fragment prev = fm.findFragmentByTag(fragmentTag);
		if (prev != null) {
			ft.remove(prev);
		}
		ft.addToBackStack(null);

		// Create and show the dialog.
		dialogFragment.show(ft, fragmentTag);
	}

	public static void createFragment(@Nonnull FragmentActivity activity,
									  @Nonnull Class fragmentClass,
									  int parentViewId,
									  @Nonnull String tag) {
		createFragment(activity, fragmentClass, parentViewId, tag, null);
	}

	public static void createFragment(@Nonnull FragmentActivity activity,
									  @Nonnull Class fragmentClass,
									  int parentViewId,
									  @Nonnull String tag,
									  @Nullable Bundle args) {
		final android.support.v4.app.FragmentManager fm = activity.getSupportFragmentManager();

		android.support.v4.app.Fragment messagesFragment = fm.findFragmentByTag(tag);

		final android.support.v4.app.FragmentTransaction ft = fm.beginTransaction();
		try {
			if (messagesFragment == null) {
				messagesFragment = android.support.v4.app.Fragment.instantiate(activity, fragmentClass.getName(), args);
				ft.add(parentViewId, messagesFragment, tag);
			} else {
				if (messagesFragment.isDetached()) {
					ft.attach(messagesFragment);
				}
			}
		} finally {
			ft.commit();
		}
	}
}