/*
 * Copyright (C) 2007 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.widget.listview.arrowscroll;

import android.test.ActivityInstrumentationTestCase;
import android.view.KeyEvent;
import android.view.View;
import android.widget.ListView;
import android.widget.listview.ListOfThinItems;

import androidx.test.filters.LargeTest;
import androidx.test.filters.MediumTest;
import androidx.test.filters.Suppress;

public class ListOfThinItemsTest extends ActivityInstrumentationTestCase<ListOfThinItems> {
    private ListView mListView;

    public ListOfThinItemsTest() {
        super("com.android.frameworks.coretests", ListOfThinItems.class);
    }

    @Override
    protected void setUp() throws Exception{
        super.setUp();
        mListView = getActivity().getListView();
    }

    @MediumTest
    @Suppress // Failing.
    public void testPreconditions() {
        assertNotNull(mListView);
        assertTrue("need item height less than fading edge length",
                mListView.getSelectedView().getHeight() < mListView.getVerticalFadingEdgeLength());
        assertTrue("need items off screen",
                mListView.getChildCount() < mListView.getAdapter().getCount());
    }

    @LargeTest
    public void testScrollToBottom() {
        // focus the listview
        getActivity().runOnUiThread(() -> mListView.requestFocus());
        getInstrumentation().waitForIdleSync();

        final int numItems = mListView.getAdapter().getCount();
        final int listBottom = mListView.getHeight() - mListView.getListPaddingBottom();
        for (int i = 0; i < numItems; i++) {
            assertEquals("wrong selection at position " + i,
                    i, mListView.getSelectedItemPosition());
            final int bottomFadingEdge = listBottom - mListView.getVerticalFadingEdgeLength();
            final View lastChild = mListView.getChildAt(mListView.getChildCount() - 1);
            final int lastVisiblePosition = lastChild.getId();


            int bottomThreshold = (lastVisiblePosition < mListView.getAdapter().getCount() - 1) ?
                    bottomFadingEdge : listBottom;

            String prefix = "after " + i + " down presses, ";

            assertTrue(prefix + "selected item is below bottom threshold (fading edge or bottom as " +
                    "appropriate)",
                    mListView.getSelectedView().getBottom() <= bottomThreshold);
            assertTrue(prefix + "first item in list must be at very top or just above",
                    mListView.getChildAt(0).getTop() <= 0);
            assertTrue(prefix + "last item in list should be at very bottom or just below",
                    lastChild.getBottom() >= listBottom);
            sendKeys(KeyEvent.KEYCODE_DPAD_DOWN);
        }
    }

    @LargeTest
    public void testScrollToTop() {
        // focus the listview
        getActivity().runOnUiThread(() -> mListView.requestFocus());
        getInstrumentation().waitForIdleSync();

        final int numItems = mListView.getAdapter().getCount();

        for (int i = 0; i < numItems - 1; i++) {
            sendKeys(KeyEvent.KEYCODE_DPAD_DOWN);
        }
        assertEquals("should have moved to last position",
                numItems - 1, mListView.getSelectedItemPosition());

        int listTop = mListView.getListPaddingTop();
        final int listBottom = mListView.getHeight() - mListView.getListPaddingBottom();

        for (int i = 0; i < numItems; i++) {
            int expectedPostion = numItems - (i + 1);
            assertEquals("wrong selection at position " + expectedPostion,
                    expectedPostion, mListView.getSelectedItemPosition());
            final int topFadingEdge = listTop + mListView.getVerticalFadingEdgeLength();
            final View firstChild = mListView.getChildAt(0);
            final View lastChild = mListView.getChildAt(mListView.getChildCount() - 1);
            final int firstVisiblePosition = firstChild.getId();


            int topThreshold = (firstVisiblePosition > 0) ?
                    topFadingEdge : listTop;

            String prefix = "after " + i + " up presses, ";

            assertTrue(prefix + "selected item is above top threshold (fading edge or top as " +
                    "appropriate)",
                    mListView.getSelectedView().getTop() >= topThreshold);
            assertTrue(prefix + "first item in list must be at very top or just above",
                    firstChild.getTop() <= 0);
            assertTrue(prefix + "last item in list should be at very bottom or just below",
                    lastChild.getBottom() >= listBottom);
            sendKeys(KeyEvent.KEYCODE_DPAD_UP);
        }
    }
}
