/*
 * Copyright (C) 2010 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 com.android.common.widget;

import static com.android.common.widget.GroupingListAdapter.ITEM_TYPE_GROUP_HEADER;
import static com.android.common.widget.GroupingListAdapter.ITEM_TYPE_IN_GROUP;
import static com.android.common.widget.GroupingListAdapter.ITEM_TYPE_STANDALONE;

import android.content.Context;
import android.database.Cursor;
import android.database.MatrixCursor;
import android.test.AndroidTestCase;
import android.text.TextUtils;
import android.view.View;
import android.view.ViewGroup;

/**
 * Tests for {@link GroupingListAdapter}.
 *
 * Running all tests:
 *
 *   adb shell am instrument -e class com.android.common.widget.GroupingListAdapterTests \
 *     -w com.android.common.tests/android.test.InstrumentationTestRunner
 */
public class GroupingListAdapterTests extends AndroidTestCase {

    static private final String[] PROJECTION = new String[] {
        "_id",
        "group",
    };

    private static final int GROUPING_COLUMN_INDEX = 1;

    private MatrixCursor mCursor;
    private long mNextId;

    private GroupingListAdapter mAdapter = new GroupingListAdapter(null) {

        @Override
        protected void addGroups(Cursor cursor) {
            int count = cursor.getCount();
            int groupItemCount = 1;
            cursor.moveToFirst();
            String currentValue = cursor.getString(GROUPING_COLUMN_INDEX);
            for (int i = 1; i < count; i++) {
                cursor.moveToNext();
                String value = cursor.getString(GROUPING_COLUMN_INDEX);
                if (TextUtils.equals(value, currentValue)) {
                    groupItemCount++;
                } else {
                    if (groupItemCount > 1) {
                        addGroup(i - groupItemCount, groupItemCount, false);
                    }

                    groupItemCount = 1;
                    currentValue = value;
                }
            }
            if (groupItemCount > 1) {
                addGroup(count - groupItemCount, groupItemCount, false);
            }
        }

        @Override
        protected void bindChildView(View view, Context context, Cursor cursor) {
        }

        @Override
        protected void bindGroupView(View view, Context context, Cursor cursor, int groupSize,
                boolean expanded) {
        }

        @Override
        protected void bindStandAloneView(View view, Context context, Cursor cursor) {
        }

        @Override
        protected View newChildView(Context context, ViewGroup parent) {
            return null;
        }

        @Override
        protected View newGroupView(Context context, ViewGroup parent) {
            return null;
        }

        @Override
        protected View newStandAloneView(Context context, ViewGroup parent) {
            return null;
        }
    };

    private void buildCursor(String... numbers) {
        mCursor = new MatrixCursor(PROJECTION);
        mNextId = 1;
        for (String number : numbers) {
            mCursor.addRow(new Object[]{mNextId, number});
            mNextId++;
        }
    }

    public void testGroupingWithoutGroups() {
        buildCursor("1", "2", "3");
        mAdapter.changeCursor(mCursor);

        assertEquals(3, mAdapter.getCount());
        assertPositionMetadata(0, ITEM_TYPE_STANDALONE, false, 0);
        assertPositionMetadata(1, ITEM_TYPE_STANDALONE, false, 1);
        assertPositionMetadata(2, ITEM_TYPE_STANDALONE, false, 2);
    }

    public void testGroupingWithCollapsedGroupAtTheBeginning() {
        buildCursor("1", "1", "2");
        mAdapter.changeCursor(mCursor);

        assertEquals(2, mAdapter.getCount());
        assertPositionMetadata(0, ITEM_TYPE_GROUP_HEADER, false, 0);
        assertPositionMetadata(1, ITEM_TYPE_STANDALONE, false, 2);
    }

    public void testGroupingWithExpandedGroupAtTheBeginning() {
        buildCursor("1", "1", "2");
        mAdapter.changeCursor(mCursor);
        mAdapter.toggleGroup(0);

        assertEquals(4, mAdapter.getCount());
        assertPositionMetadata(0, ITEM_TYPE_GROUP_HEADER, true, 0);
        assertPositionMetadata(1, ITEM_TYPE_IN_GROUP, false, 0);
        assertPositionMetadata(2, ITEM_TYPE_IN_GROUP, false, 1);
        assertPositionMetadata(3, ITEM_TYPE_STANDALONE, false, 2);
    }

    public void testGroupingWithExpandCollapseCycleAtTheBeginning() {
        buildCursor("1", "1", "2");
        mAdapter.changeCursor(mCursor);
        mAdapter.toggleGroup(0);
        mAdapter.toggleGroup(0);

        assertEquals(2, mAdapter.getCount());
        assertPositionMetadata(0, ITEM_TYPE_GROUP_HEADER, false, 0);
        assertPositionMetadata(1, ITEM_TYPE_STANDALONE, false, 2);
    }

    public void testGroupingWithCollapsedGroupInTheMiddle() {
        buildCursor("1", "2", "2", "2", "3");
        mAdapter.changeCursor(mCursor);

        assertEquals(3, mAdapter.getCount());
        assertPositionMetadata(0, ITEM_TYPE_STANDALONE, false, 0);
        assertPositionMetadata(1, ITEM_TYPE_GROUP_HEADER, false, 1);
        assertPositionMetadata(2, ITEM_TYPE_STANDALONE, false, 4);
    }

    public void testGroupingWithExpandedGroupInTheMiddle() {
        buildCursor("1", "2", "2", "2", "3");
        mAdapter.changeCursor(mCursor);
        mAdapter.toggleGroup(1);

        assertEquals(6, mAdapter.getCount());
        assertPositionMetadata(0, ITEM_TYPE_STANDALONE, false, 0);
        assertPositionMetadata(1, ITEM_TYPE_GROUP_HEADER, true, 1);
        assertPositionMetadata(2, ITEM_TYPE_IN_GROUP, false, 1);
        assertPositionMetadata(3, ITEM_TYPE_IN_GROUP, false, 2);
        assertPositionMetadata(4, ITEM_TYPE_IN_GROUP, false, 3);
        assertPositionMetadata(5, ITEM_TYPE_STANDALONE, false, 4);
    }

    public void testGroupingWithCollapsedGroupAtTheEnd() {
        buildCursor("1", "2", "3", "3", "3");
        mAdapter.changeCursor(mCursor);

        assertEquals(3, mAdapter.getCount());
        assertPositionMetadata(0, ITEM_TYPE_STANDALONE, false, 0);
        assertPositionMetadata(1, ITEM_TYPE_STANDALONE, false, 1);
        assertPositionMetadata(2, ITEM_TYPE_GROUP_HEADER, false, 2);
    }

    public void testGroupingWithExpandedGroupAtTheEnd() {
        buildCursor("1", "2", "3", "3", "3");
        mAdapter.changeCursor(mCursor);
        mAdapter.toggleGroup(2);

        assertEquals(6, mAdapter.getCount());
        assertPositionMetadata(0, ITEM_TYPE_STANDALONE, false, 0);
        assertPositionMetadata(1, ITEM_TYPE_STANDALONE, false, 1);
        assertPositionMetadata(2, ITEM_TYPE_GROUP_HEADER, true, 2);
        assertPositionMetadata(3, ITEM_TYPE_IN_GROUP, false, 2);
        assertPositionMetadata(4, ITEM_TYPE_IN_GROUP, false, 3);
        assertPositionMetadata(5, ITEM_TYPE_IN_GROUP, false, 4);
    }

    public void testGroupingWithMultipleCollapsedGroups() {
        buildCursor("1", "2", "2", "3", "4", "4", "5", "5", "6");
        mAdapter.changeCursor(mCursor);

        assertEquals(6, mAdapter.getCount());
        assertPositionMetadata(0, ITEM_TYPE_STANDALONE, false, 0);
        assertPositionMetadata(1, ITEM_TYPE_GROUP_HEADER, false, 1);
        assertPositionMetadata(2, ITEM_TYPE_STANDALONE, false, 3);
        assertPositionMetadata(3, ITEM_TYPE_GROUP_HEADER, false, 4);
        assertPositionMetadata(4, ITEM_TYPE_GROUP_HEADER, false, 6);
        assertPositionMetadata(5, ITEM_TYPE_STANDALONE, false, 8);
    }

    public void testGroupingWithMultipleExpandedGroups() {
        buildCursor("1", "2", "2", "3", "4", "4", "5", "5", "6");
        mAdapter.changeCursor(mCursor);
        mAdapter.toggleGroup(1);

        // Note that expanding the group of 2's shifted the group of 5's down from the
        // 4th to the 6th position
        mAdapter.toggleGroup(6);

        assertEquals(10, mAdapter.getCount());
        assertPositionMetadata(0, ITEM_TYPE_STANDALONE, false, 0);
        assertPositionMetadata(1, ITEM_TYPE_GROUP_HEADER, true, 1);
        assertPositionMetadata(2, ITEM_TYPE_IN_GROUP, false, 1);
        assertPositionMetadata(3, ITEM_TYPE_IN_GROUP, false, 2);
        assertPositionMetadata(4, ITEM_TYPE_STANDALONE, false, 3);
        assertPositionMetadata(5, ITEM_TYPE_GROUP_HEADER, false, 4);
        assertPositionMetadata(6, ITEM_TYPE_GROUP_HEADER, true, 6);
        assertPositionMetadata(7, ITEM_TYPE_IN_GROUP, false, 6);
        assertPositionMetadata(8, ITEM_TYPE_IN_GROUP, false, 7);
        assertPositionMetadata(9, ITEM_TYPE_STANDALONE, false, 8);
    }

    public void testPositionCache() {
        buildCursor("1", "2", "2", "3", "4", "4", "5", "5", "6");
        mAdapter.changeCursor(mCursor);

        // First pass - building up cache
        assertEquals(6, mAdapter.getCount());
        assertPositionMetadata(0, ITEM_TYPE_STANDALONE, false, 0);
        assertPositionMetadata(1, ITEM_TYPE_GROUP_HEADER, false, 1);
        assertPositionMetadata(2, ITEM_TYPE_STANDALONE, false, 3);
        assertPositionMetadata(3, ITEM_TYPE_GROUP_HEADER, false, 4);
        assertPositionMetadata(4, ITEM_TYPE_GROUP_HEADER, false, 6);
        assertPositionMetadata(5, ITEM_TYPE_STANDALONE, false, 8);

        // Second pass - using cache
        assertEquals(6, mAdapter.getCount());
        assertPositionMetadata(0, ITEM_TYPE_STANDALONE, false, 0);
        assertPositionMetadata(1, ITEM_TYPE_GROUP_HEADER, false, 1);
        assertPositionMetadata(2, ITEM_TYPE_STANDALONE, false, 3);
        assertPositionMetadata(3, ITEM_TYPE_GROUP_HEADER, false, 4);
        assertPositionMetadata(4, ITEM_TYPE_GROUP_HEADER, false, 6);
        assertPositionMetadata(5, ITEM_TYPE_STANDALONE, false, 8);

        // Invalidate cache by expanding a group
        mAdapter.toggleGroup(1);

        // First pass - building up cache
        assertPositionMetadata(0, ITEM_TYPE_STANDALONE, false, 0);
        assertPositionMetadata(1, ITEM_TYPE_GROUP_HEADER, true, 1);
        assertPositionMetadata(2, ITEM_TYPE_IN_GROUP, false, 1);
        assertPositionMetadata(3, ITEM_TYPE_IN_GROUP, false, 2);
        assertPositionMetadata(4, ITEM_TYPE_STANDALONE, false, 3);
        assertPositionMetadata(5, ITEM_TYPE_GROUP_HEADER, false, 4);
        assertPositionMetadata(6, ITEM_TYPE_GROUP_HEADER, false, 6);
        assertPositionMetadata(7, ITEM_TYPE_STANDALONE, false, 8);

        // Second pass - using cache
        assertPositionMetadata(0, ITEM_TYPE_STANDALONE, false, 0);
        assertPositionMetadata(1, ITEM_TYPE_GROUP_HEADER, true, 1);
        assertPositionMetadata(2, ITEM_TYPE_IN_GROUP, false, 1);
        assertPositionMetadata(3, ITEM_TYPE_IN_GROUP, false, 2);
        assertPositionMetadata(4, ITEM_TYPE_STANDALONE, false, 3);
        assertPositionMetadata(5, ITEM_TYPE_GROUP_HEADER, false, 4);
        assertPositionMetadata(6, ITEM_TYPE_GROUP_HEADER, false, 6);
        assertPositionMetadata(7, ITEM_TYPE_STANDALONE, false, 8);
    }

    public void testGroupDescriptorArrayGrowth() {
        String[] numbers = new String[500];
        for (int i = 0; i < numbers.length; i++) {

            // Make groups of 2
            numbers[i] = String.valueOf((i / 2) * 2);
        }

        buildCursor(numbers);
        mAdapter.changeCursor(mCursor);

        assertEquals(250, mAdapter.getCount());
    }

    private void assertPositionMetadata(int position, int itemType, boolean isExpanded,
            int cursorPosition) {
        GroupingListAdapter.PositionMetadata metadata = new GroupingListAdapter.PositionMetadata();
        mAdapter.obtainPositionMetadata(metadata, position);
        assertEquals(itemType, metadata.itemType);
        if (metadata.itemType == ITEM_TYPE_GROUP_HEADER) {
            assertEquals(isExpanded, metadata.isExpanded);
        }
        assertEquals(cursorPosition, metadata.cursorPosition);
    }
}