/*
 * Copyright (C) 2017 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package android.support.v7.preference.tests;

import static junit.framework.Assert.assertEquals;
import static junit.framework.Assert.assertNull;

import android.content.Context;
import android.support.test.InstrumentationRegistry;
import android.support.test.annotation.UiThreadTest;
import android.support.test.filters.SmallTest;
import android.support.test.runner.AndroidJUnit4;
import android.support.v7.preference.CheckBoxPreference;
import android.support.v7.preference.PreferenceCategory;
import android.support.v7.preference.PreferenceManager;
import android.support.v7.preference.PreferenceScreen;

import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;

@RunWith(AndroidJUnit4.class)
@SmallTest
public class PreferenceParentGroupTest {

    private Context mContext;

    @Before
    public void setup() throws Exception {
        mContext = InstrumentationRegistry.getTargetContext();
    }

    /**
     * Tests that parent PreferenceGroup is correctly assigned and removed when creating preferences
     * from code.
     */
    @Test
    @UiThreadTest
    public void parentAddRemoveTest() {
        PreferenceManager manager = new PreferenceManager(mContext);

        PreferenceScreen screen = manager.createPreferenceScreen(mContext);
        assertNull(screen.getParent());

        PreferenceCategory category = new PreferenceCategory(mContext);
        assertNull(category.getParent());

        CheckBoxPreference pref = new CheckBoxPreference(mContext);
        assertNull(pref.getParent());

        screen.addPreference(category);
        assertEquals(screen, category.getParent());

        category.addPreference(pref);
        assertEquals(category, pref.getParent());

        screen.removePreference(category);
        assertNull(category.getParent());

        category.removePreference(pref);
        assertNull(pref.getParent());
    }

    /**
     * Tests that parent PreferenceGroup is correctly maintained during reassignment.
     */
    @Test
    @UiThreadTest
    public void parentReassignTest() {
        PreferenceManager manager = new PreferenceManager(mContext);

        PreferenceScreen screen = manager.createPreferenceScreen(mContext);

        PreferenceCategory category1 = new PreferenceCategory(mContext);
        screen.addPreference(category1);
        PreferenceCategory category2 = new PreferenceCategory(mContext);
        screen.addPreference(category2);

        CheckBoxPreference pref = new CheckBoxPreference(mContext);
        assertNull(pref.getParent());

        category1.addPreference(pref);
        assertEquals(category1, pref.getParent());

        category1.removePreference(pref);
        category2.addPreference(pref);
        assertEquals(category2, pref.getParent());
    }

    /**
     * Adds a preference into two different groups without removing it first. This is maybe not
     * something we want to support in the future but this makes this behavior visible.
     */
    @Test
    @UiThreadTest
    public void parentDoubleAddTest() throws InterruptedException {
        PreferenceManager manager = new PreferenceManager(mContext);

        PreferenceScreen screen = manager.createPreferenceScreen(mContext);

        PreferenceCategory category1 = new PreferenceCategory(mContext);
        screen.addPreference(category1);
        PreferenceCategory category2 = new PreferenceCategory(mContext);
        screen.addPreference(category2);

        CheckBoxPreference pref = new CheckBoxPreference(mContext);
        assertNull(pref.getParent());

        category1.addPreference(pref);
        category2.addPreference(pref);

        assertEquals(category2, pref.getParent());
    }
}