package com.demo.lib.common.util;

import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentTransaction;
import android.util.Log;

public class FragmentSwitchHelper {

	private static final String TAG = "FragmentSwitchHelper";

	public FragmentManager mFragmentManager;

	private Fragment[] mFragments;

	private Fragment mCurrentFragment;

	private int mContainerId;

	public Fragment getFragmentByName(String name) {
		if (mFragments == null || mFragments.length == 0)
			return null;
		for (Fragment m : mFragments)
			if (name.contains(m.getClass().getName())) {
				return m;
			}
		return null;
	}

	public static FragmentSwitchHelper create(int containerId,
			FragmentManager fragmentManager, Fragment... fragments) {
		return new FragmentSwitchHelper(containerId, fragmentManager, fragments);
	}

	private FragmentSwitchHelper(int containerId,
			FragmentManager fragmentManager, Fragment... fragments) {
		this.mContainerId = containerId;
		this.mFragments = fragments;
		this.mFragmentManager = fragmentManager;
	}

	public void changeFragment(Class<? extends Fragment> replaceFragmentClass) {
		if (!mFragmentManager.isDestroyed()) {
			Fragment replaceFragment = mFragmentManager
					.findFragmentByTag(replaceFragmentClass.getName());
			if (mCurrentFragment == replaceFragment && mCurrentFragment != null) {
				Log.d(TAG, "changeFragment noChange ");
				return;
			}
			FragmentTransaction fragmentTransaction = mFragmentManager
					.beginTransaction();
			if (mCurrentFragment != null) {
				fragmentTransaction.detach(mCurrentFragment);
				Log.d(TAG, "changeFragment detach "
						+ mCurrentFragment.getClass().getName());
			}
			if (replaceFragment == null) {
				for (Fragment item : mFragments) {
					if (item.getClass().getName()
							.equals(replaceFragmentClass.getName())) {
						replaceFragment = item;
						break;
					}
				}
				fragmentTransaction.add(mContainerId, replaceFragment,
						replaceFragmentClass.getName());
				mCurrentFragment = replaceFragment;
				Log.d(TAG,
						"changeFragment add " + replaceFragmentClass.getName());
			} else {
				fragmentTransaction.attach(replaceFragment);
				mCurrentFragment = replaceFragment;
				Log.d(TAG,
						"changeFragment attach "
								+ replaceFragmentClass.getName());
			}
			fragmentTransaction.commitAllowingStateLoss();
		}
	}
}