/*
 * Copyright 2011 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.client.ui;

import com.google.gwt.core.client.Scheduler;
import com.google.gwt.core.client.Scheduler.ScheduledCommand;
import com.google.gwt.junit.DoNotRunWith;
import com.google.gwt.junit.Platform;
import com.google.gwt.user.client.Timer;

import java.util.Iterator;
import java.util.NoSuchElementException;

/**
 * Tests for {@link HeaderPanel}.
 */
public class HeaderPanelTest extends PanelTestBase<HeaderPanel> {

  public void testAdd() {
    HeaderPanel panel = createPanel();

    // Add the header first.
    Label header = new Label("header");
    panel.add(header);
    assertEquals(header, panel.getHeaderWidget());
    assertEquals(null, panel.getContentWidget());
    assertEquals(null, panel.getFooterWidget());

    // Add the content second.
    Label content = new Label("content");
    panel.add(content);
    assertEquals(header, panel.getHeaderWidget());
    assertEquals(content, panel.getContentWidget());
    assertEquals(null, panel.getFooterWidget());

    // Add the footer third.
    Label footer = new Label("footer");
    panel.add(footer);
    assertEquals(header, panel.getHeaderWidget());
    assertEquals(content, panel.getContentWidget());
    assertEquals(footer, panel.getFooterWidget());

    // Cannot add a fourth widget.
    try {
      panel.add(new Label());
      fail("Expected IllegalStateException");
    } catch (IllegalStateException e) {
      // Expected.
    }
  }

  public void testIterator() {
    final HeaderPanel panel = createPanel();

    // Empty iterator.
    Iterator<Widget> iter = panel.iterator();
    assertFalse(iter.hasNext());
    try {
      iter.next();
      fail("Expected NoSuchElementException");
    } catch (NoSuchElementException e) {
      // Expected.
    }
    try {
      iter.remove();
      fail("Expected IllegalStateException");
    } catch (IllegalStateException e) {
      // Expected.
    }

    // Only a content.
    Label content = new Label("content");
    panel.setContentWidget(content);
    iter = panel.iterator();
    assertTrue(iter.hasNext());
    assertEquals(content, iter.next());
    assertFalse(iter.hasNext());
    try {
      iter.next();
      fail("Expected NoSuchElementException");
    } catch (NoSuchElementException e) {
      // Expected.
    }

    // Header, Content, Footer.
    Label header = new Label("header");
    Label footer = new Label("footer");
    panel.setHeaderWidget(header);
    panel.setFooterWidget(footer);
    iter = panel.iterator();
    assertTrue(iter.hasNext());
    assertEquals(header, iter.next());
    assertTrue(iter.hasNext());
    assertEquals(content, iter.next());
    assertTrue(iter.hasNext());
    assertEquals(footer, iter.next());
    assertFalse(iter.hasNext());
    try {
      iter.next();
      fail("Expected NoSuchElementException");
    } catch (NoSuchElementException e) {
      // Expected.
    }

    // Remove Content.
    iter = panel.iterator();
    assertEquals(header, iter.next());
    assertEquals(content, iter.next());
    iter.remove();
    assertEquals(header, panel.getHeaderWidget());
    assertNull(panel.getContentWidget());
    assertEquals(footer, panel.getFooterWidget());
    try {
      iter.remove();
      fail("Expected IllegalStateException");
    } catch (IllegalStateException e) {
      // Expected - cannot remove twice.
    }
    assertEquals(footer, iter.next());
  }

  @DoNotRunWith(Platform.HtmlUnitLayout)
  public void testResizeFooter() {
    final HeaderPanel panel = createPanel();
    panel.setSize("200px", "400px");
    RootPanel.get().add(panel);

    final Label header = new Label();
    header.setSize("100%", "50px");
    panel.setHeaderWidget(header);

    final Label content = new Label();
    content.setHeight("100%");
    panel.setContentWidget(content);

    final Label footer = new Label();
    footer.setSize("100%", "50px");
    panel.setFooterWidget(footer);

    delayTestFinish(5000);
    Scheduler.get().scheduleDeferred(new ScheduledCommand() {
      public void execute() {
        assertEquals(300, content.getOffsetHeight());

        // Resize the footer.
        footer.setHeight("75px");
        new Timer() {
          @Override
          public void run() {
            assertEquals(275, content.getOffsetHeight());
            RootPanel.get().remove(panel);
            finishTest();
          }
        }.schedule(250);;
      }
    });
  }

  @DoNotRunWith(Platform.HtmlUnitLayout)
  public void testResizeHeader() {
    final HeaderPanel panel = createPanel();
    panel.setSize("200px", "400px");
    RootPanel.get().add(panel);

    final Label header = new Label();
    header.setSize("100%", "50px");
    panel.setHeaderWidget(header);

    final Label content = new Label();
    content.setHeight("100%");
    panel.setContentWidget(content);

    final Label footer = new Label();
    footer.setSize("100%", "50px");
    panel.setFooterWidget(footer);

    delayTestFinish(5000);
    Scheduler.get().scheduleDeferred(new ScheduledCommand() {
      public void execute() {
        assertEquals(300, content.getOffsetHeight());

        // Resize the header.
        header.setHeight("75px");
        new Timer() {
          @Override
          public void run() {
            assertEquals(275, content.getOffsetHeight());
            RootPanel.get().remove(panel);
            finishTest();
          }
        }.schedule(250);;
      }
    });
  }

  public void testSetContentWidget() {
    HeaderPanel panel = createPanel();
    Label widget = new Label("hello world");
    panel.setContentWidget(widget);
    assertEquals(widget, panel.getContentWidget());

    panel.remove(widget);
    assertNull(panel.getContentWidget());
  }

  public void testSetFooterWidget() {
    HeaderPanel panel = createPanel();
    Label widget = new Label("hello world");
    panel.setHeaderWidget(widget);
    assertEquals(widget, panel.getHeaderWidget());

    panel.remove(widget);
    assertNull(panel.getHeaderWidget());
  }

  public void testSetHeaderWidget() {
    HeaderPanel panel = createPanel();
    Label widget = new Label("hello world");
    panel.setFooterWidget(widget);
    assertEquals(widget, panel.getFooterWidget());

    panel.remove(widget);
    assertNull(panel.getFooterWidget());
  }

  @Override
  protected HeaderPanel createPanel() {
    return new HeaderPanel();
  }

  @Override
  protected boolean supportsMultipleWidgets() {
    // HeaderPanel supports up to 3 widgets, but not an unbounded number.
    return false;
  }
}