/*
 * Copyright 2000-2016 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;

import com.intellij.openapi.application.ApplicationManager;
import com.intellij.util.SystemProperties;
import org.jetbrains.annotations.Nullable;

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

/**
 * IDE-agnostic component settings.
 */
public class ComponentSettings {
  private boolean mySmoothScrollingEnabled = true;
  private boolean myRemoteDesktopConnected;
  private boolean myPowerSaveModeEnabled;

  private static final ComponentSettings ourInstance = new ComponentSettings();

  public static ComponentSettings getInstance() {
    return ourInstance;
  }

  public boolean isSmoothScrollingEligibleFor(Component component) {
    return SystemProperties.isTrueSmoothScrollingEnabled() &&
           !ApplicationManager.getApplication().isUnitTestMode() &&
           mySmoothScrollingEnabled &&
           !myRemoteDesktopConnected &&
           !myPowerSaveModeEnabled &&
           component != null &&
           component.isShowing();
  }

  /* A heuristics that disables scrolling interpolation in diff / merge windows.
     We need to to make scrolling synchronization compatible with the interpolation first.

     NOTE: The implementation is a temporary, ad-hoc heuristics that is needed solely to
           facilitate testing of the experimental "true smooth scrolling" feature. */
  public boolean isInterpolationEligibleFor(JScrollBar scrollbar) {
    Component[] components = getComponents((Window)scrollbar.getTopLevelAncestor());
    if (components.length == 1 && components[0].getClass().getName().contains("DiffWindow")) {
      return false;
    }
    if (components.length == 2 && components[0] instanceof Container) {
      Component[] subComponents = ((Container)components[0]).getComponents();
      if (subComponents.length == 1 && subComponents[0].getClass().getName().contains("MergeWindow")) {
        return false;
      }
    }
    return true;
  }

  private static Component[] getComponents(@Nullable Window window) {
    if (window instanceof JFrame) {
      return ((JFrame)window).getContentPane().getComponents();
    }
    if (window instanceof JDialog) {
      return ((JDialog)window).getContentPane().getComponents();
    }
    return new Component[0];
  }

  public void setSmoothScrollingEnabled(boolean enabled) {
    mySmoothScrollingEnabled = enabled;
  }

  public void setRemoteDesktopConnected(boolean connected) {
    myRemoteDesktopConnected = connected;
  }

  public void setPowerSaveModeEnabled(boolean enabled) {
    myPowerSaveModeEnabled = enabled;
  }
}