/*
 * Copyright 2000-2011 JetBrains s.r.o.
 *
 * 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.intellij.ui.components;

import com.intellij.openapi.Disposable;
import com.intellij.openapi.ui.LoadingDecorator;
import com.intellij.ui.ColorUtil;
import com.intellij.ui.components.panels.NonOpaquePanel;
import com.intellij.util.NotNullFunction;
import com.intellij.util.containers.ContainerUtil;
import com.intellij.util.ui.AsyncProcessIcon;
import com.intellij.util.ui.UIUtil;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import javax.swing.*;
import java.awt.*;
import java.util.Collection;

/**
 * @author Konstantin Bulenkov
 */
public class JBLoadingPanel extends JPanel {
  private final JPanel myPanel;
  final LoadingDecorator myDecorator;
  private final Collection<JBLoadingPanelListener> myListeners = ContainerUtil.createLockFreeCopyOnWriteList();

  public JBLoadingPanel(@Nullable LayoutManager manager, @NotNull Disposable parent) {
    this(manager, parent, -1);
  }

  public JBLoadingPanel(@Nullable LayoutManager manager, @NotNull Disposable parent, int startDelayMs) {
    this(manager, panel -> new LoadingDecorator(panel, parent, startDelayMs) {
      @Override
      protected NonOpaquePanel customizeLoadingLayer(JPanel parent, JLabel text, AsyncProcessIcon icon) {
        final NonOpaquePanel panel = super.customizeLoadingLayer(parent, text, icon);
        customizeStatusText(text);
        return panel;
      }
    });
  }

  public JBLoadingPanel(@Nullable LayoutManager manager, @NotNull NotNullFunction<JPanel, LoadingDecorator> createLoadingDecorator) {
    super(new BorderLayout());
    myPanel = manager == null ? new JPanel() : new JPanel(manager);
    myPanel.setOpaque(false);
    myDecorator = createLoadingDecorator.fun(myPanel);
    super.add(myDecorator.getComponent(), BorderLayout.CENTER);
  }

  public static void customizeStatusText(JLabel text) {
    Font font = text.getFont();
    text.setFont(font.deriveFont(font.getStyle(), font.getSize() + 6));
    text.setForeground(ColorUtil.toAlpha(UIUtil.getLabelForeground(), 150));
  }

  public void setLoadingText(String text) {
    myDecorator.setLoadingText(text);
  }

  public void stopLoading() {
    myDecorator.stopLoading();
    for (JBLoadingPanelListener listener : myListeners) {
      listener.onLoadingFinish();
    }
  }

  public boolean isLoading() {
    return myDecorator.isLoading();
  }

  public void startLoading() {
    myDecorator.startLoading(false);
    for (JBLoadingPanelListener listener : myListeners) {
      listener.onLoadingStart();
    }
  }

  public void addListener(@NotNull JBLoadingPanelListener listener) {
    myListeners.add(listener);
  }

  public boolean removeListener(@NotNull JBLoadingPanelListener listener) {
    return myListeners.remove(listener);
  }

  public JPanel getContentPanel() {
    return myPanel;
  }

  @Override
  public Component add(Component comp) {
    return myPanel.add(comp);
  }

  @Override
  public Component add(Component comp, int index) {
    return myPanel.add(comp, index);
  }

  @Override
  public void add(Component comp, Object constraints) {
    myPanel.add(comp, constraints);
  }

  @Override
  public Dimension getPreferredSize() {
    return getContentPanel().getPreferredSize();
  }
}
