/*
 * Copyright 2010 Google Inc.
 *
 * 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.google.gwt.user.cellview.client;

import com.google.gwt.junit.client.GWTTestCase;
import com.google.gwt.regexp.shared.MatchResult;
import com.google.gwt.regexp.shared.RegExp;
import com.google.gwt.user.client.Window;
import com.google.gwt.view.client.ListDataProvider;

import java.util.ArrayList;
import java.util.List;

/**
 * Base tests for {@link AbstractHasData}.
 */
public abstract class AbstractHasDataTestBase extends GWTTestCase {

  @Override
  public String getModuleName() {
    return "com.google.gwt.user.cellview.CellView";
  }

  public void testGetDisplayedItem() {
    AbstractHasData<String> display = createAbstractHasData();
    ListDataProvider<String> provider = new ListDataProvider<String>(
        createData(0, 13));
    provider.addDataDisplay(display);
    display.setVisibleRange(10, 10);

    // No items when no data is present.
    assertEquals("test 10", display.getDisplayedItem(0));
    assertEquals("test 11", display.getDisplayedItem(1));
    assertEquals("test 12", display.getDisplayedItem(2));

    // Out of range.
    try {
      assertEquals("test 10", display.getDisplayedItem(-1));
      fail("Expected IndexOutOfBoundsException");
    } catch (IndexOutOfBoundsException e) {
      // Expected.
    }

    // Within page range, but out of data range.
    try {
      assertEquals("test 10", display.getDisplayedItem(4));
      fail("Expected IndexOutOfBoundsException");
    } catch (IndexOutOfBoundsException e) {
      // Expected.
    }
  }

  public void testGetDisplayedItems() {
    AbstractHasData<String> display = createAbstractHasData();
    ListDataProvider<String> provider = new ListDataProvider<String>();
    provider.addDataDisplay(display);
    display.setVisibleRange(10, 3);

    // No items when no data is present.
    assertEquals(0, display.getDisplayedItems().size());

    // Set some data.
    provider.setList(createData(0, 13));
    List<String> items = display.getDisplayedItems();
    assertEquals(3, items.size());
    assertEquals("test 10", items.get(0));
    assertEquals("test 11", items.get(1));
    assertEquals("test 12", items.get(2));
  }

  public void testSetTabIndex() {
    // Skip this test on Safari 3 because it does not support focusable divs.
    String userAgent = Window.Navigator.getUserAgent();
    if (userAgent.contains("Safari")) {
      RegExp versionRegExp = RegExp.compile("Version/[0-3]", "ig");
      MatchResult result = versionRegExp.exec(userAgent);
      if (result != null && result.getGroupCount() > 0) {
        return;
      }
    }

    AbstractHasData<String> display = createAbstractHasData();
    ListDataProvider<String> provider = new ListDataProvider<String>(
        createData(0, 10));
    provider.addDataDisplay(display);

    // Default tab index is 0.
    assertEquals(0, display.getTabIndex());
    assertEquals(0, display.getKeyboardSelectedElement().getTabIndex());

    // Set tab index to 2.
    display.setTabIndex(2);
    assertEquals(2, display.getTabIndex());
    assertEquals(2, display.getKeyboardSelectedElement().getTabIndex());

    // Push new data.
    provider.refresh();
    assertEquals(2, display.getTabIndex());
    assertEquals(2, display.getKeyboardSelectedElement().getTabIndex());
  }

  /**
   * Create an {@link AbstractHasData} to test.
   *
   * @return the widget to test
   */
  protected abstract AbstractHasData<String> createAbstractHasData();

  /**
   * Create a list of data for testing.
   *
   * @param start the start index
   * @param length the length
   * @return a list of data
   */
  protected List<String> createData(int start, int length) {
    List<String> toRet = new ArrayList<String>();
    for (int i = 0; i < length; i++) {
      toRet.add("test " + (i + start));
    }
    return toRet;
  }
}