/*
 * Copyright 2008 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.event.dom.client;

import com.google.gwt.dom.client.Document;
import com.google.gwt.dom.client.NativeEvent;
import com.google.gwt.event.shared.EventHandler;
import com.google.gwt.event.shared.HandlerManager;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.event.shared.HandlerTestBase;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.RootPanel;

/**
 * Events test.
 */
public class DomEventTest extends HandlerTestBase {
  private HandlerManager manager;
  static class Flag {
    public boolean flag = false;
  }

  interface CustomClickHandler extends EventHandler {
    void onClick(CustomClickEvent evt);
  }

  static class CustomClickEvent extends MouseEvent<CustomClickHandler> {

    public static final Type<CustomClickHandler> TYPE =
        new Type<CustomClickHandler>("click", new CustomClickEvent());

    public static Type<CustomClickHandler> getType() {
      return TYPE;
    }

    @Override
    public Type<CustomClickHandler> getAssociatedType() {
      return TYPE;
    }

    @Override
    protected void dispatch(CustomClickHandler handler) {
      handler.onClick(this);
    }
  }

  public void testKeyEvents() {

    final Flag flag = new Flag();
    manager = new HandlerManager(flag);
    HandlerRegistration downRegistration = manager.addHandler(
        KeyDownEvent.getType(), new KeyDownHandler() {
          @Override
          public void onKeyDown(KeyDownEvent event) {
            flag.flag = true;
          }
        });
    HandlerRegistration upRegistration = manager.addHandler(
        KeyUpEvent.getType(), new KeyUpHandler() {
          @Override
          public void onKeyUp(KeyUpEvent event) {
            flag.flag = true;
          }
        });

    HandlerRegistration pressRegistration = manager.addHandler(
        KeyPressEvent.getType(), new KeyPressHandler() {
          @Override
          public void onKeyPress(KeyPressEvent event) {
            flag.flag = true;
          }
        });

    checkFire(new KeyDownEvent(), downRegistration, flag, "onKeyDown");
    checkFire(new KeyUpEvent(), upRegistration, flag, "onKeyUp");
    checkFire(new KeyPressEvent(), pressRegistration, flag, "onKeyPressed");
  }

  public void testMouseEvents() {
    final Flag flag = new Flag();
    manager = new HandlerManager(flag);

    HandlerRegistration downRegistration = manager.addHandler(
        MouseDownEvent.getType(), new MouseDownHandler() {
          @Override
          public void onMouseDown(MouseDownEvent event) {
            flag.flag = true;
          }
        });
    HandlerRegistration upRegistration = manager.addHandler(
        MouseUpEvent.getType(), new MouseUpHandler() {
          @Override
          public void onMouseUp(MouseUpEvent event) {
            flag.flag = true;
          }
        });

    HandlerRegistration clickRegistration = manager.addHandler(
        ClickEvent.getType(), new ClickHandler() {
          @Override
          public void onClick(ClickEvent event) {
            flag.flag = true;
          }
        });

    HandlerRegistration dblclickRegistration = manager.addHandler(
        DoubleClickEvent.getType(), new DoubleClickHandler() {
          @Override
          public void onDoubleClick(DoubleClickEvent event) {
            flag.flag = true;
          }
        });

    HandlerRegistration outRegistration = manager.addHandler(
        MouseOutEvent.getType(), new MouseOutHandler() {
          @Override
          public void onMouseOut(MouseOutEvent event) {
            flag.flag = true;
          }
        });
    HandlerRegistration overRegistration = manager.addHandler(
        MouseOverEvent.getType(), new MouseOverHandler() {
          @Override
          public void onMouseOver(MouseOverEvent event) {
            flag.flag = true;
          }
        });

    HandlerRegistration moveRegistration = manager.addHandler(
        MouseMoveEvent.getType(), new MouseMoveHandler() {
          @Override
          public void onMouseMove(MouseMoveEvent event) {
            flag.flag = true;
          }
        });

    HandlerRegistration wheelRegistration = manager.addHandler(
        MouseWheelEvent.getType(), new MouseWheelHandler() {
          @Override
          public void onMouseWheel(MouseWheelEvent event) {
            flag.flag = true;
          }
        });

    checkFire(new MouseDownEvent(), downRegistration, flag, "onMouseDown");
    checkFire(new MouseUpEvent(), upRegistration, flag, "onMouseUp");
    checkFire(new MouseOutEvent(), outRegistration, flag, "onMouseOut");
    checkFire(new MouseOverEvent(), overRegistration, flag, "onMouseOver");
    checkFire(new MouseMoveEvent(), moveRegistration, flag, "onMouseMove");
    checkFire(new MouseWheelEvent(), wheelRegistration, flag, "onMouseWheel");
    checkFire(new ClickEvent(), clickRegistration, flag, "onClick");
    checkFire(new DoubleClickEvent(), dblclickRegistration, flag,
        "onDoubleClick");
  }

  public void testMouseEventCoordinates() {
    Button b = new Button();
    RootPanel.get().add(b);

    final Flag flag = new Flag();
    b.addMouseDownHandler(new MouseDownHandler() {
      @Override
      public void onMouseDown(MouseDownEvent event) {
        assertEquals("", 16, event.getX());
        assertEquals("", 8, event.getY());
        flag.flag = true;
      }
    });

    int x = b.getAbsoluteLeft() + 16;
    int y = b.getAbsoluteTop() + 8;
    NativeEvent event = Document.get().createMouseDownEvent(0, x, y, x, y,
        false, false, false, false, 1);
    b.getElement().dispatchEvent(event);

    assertTrue("Never received expected mouse-down event", flag.flag);
  }

  public void testMultipleDomEventTypesPerEventName() {
    Button b = new Button();
    RootPanel.get().add(b);

    final Flag first = new Flag();
    b.addClickHandler(new ClickHandler() {
      @Override
      public void onClick(ClickEvent event) {
        first.flag = true;
      }
    });

    final Flag second = new Flag();
    b.addDomHandler(new CustomClickHandler() {
      @Override
      public void onClick(CustomClickEvent event) {
        second.flag = true;
      }
    }, CustomClickEvent.getType());

    NativeEvent event = Document.get().createClickEvent(0, 0, 0, 0, 0, false, false, false, false);
    b.getElement().dispatchEvent(event);

    assertTrue("Never received expected click event", first.flag);
    assertTrue("Never received expected click event", second.flag);
  }

  private void checkFire(DomEvent<?> event, HandlerRegistration registration,
      Flag flag, String eventName) {

    flag.flag = false;
    manager.fireEvent(event);
    assertTrue(eventName + " didn't fire.", flag.flag);

    flag.flag = false;
    registration.removeHandler();
    // event.reset(null);
    manager.fireEvent(event);
    assertTrue(eventName + " fired when it shouldn't have.", !flag.flag);
  }
}