package binnie.craftgui.controls.scroll;

import binnie.craftgui.controls.core.Control;
import binnie.craftgui.core.Attribute;
import binnie.craftgui.core.CraftGUI;
import binnie.craftgui.core.IWidget;
import binnie.craftgui.core.geometry.IArea;
import binnie.craftgui.core.geometry.IPoint;
import binnie.craftgui.core.renderer.Renderer;
import binnie.craftgui.events.EventMouse.Down;
import binnie.craftgui.events.EventMouse.Down.Handler;
import binnie.craftgui.events.EventMouse.Drag;
import binnie.craftgui.events.EventMouse.Drag.Handler;
import binnie.craftgui.resource.minecraft.CraftGUITexture;

public class ControlScrollBar
  extends Control
{
  protected final IControlScrollable scrollable;
  
  public ControlScrollBar(ControlScroll parent)
  {
    this(parent, 0.0F, 0.0F, parent.getSize().x(), parent.getSize().y(), parent.getScrollableWidget());
  }
  
  public ControlScrollBar(IWidget parent, float x, float y, float w, float h, IControlScrollable scrollable2)
  {
    super(parent, x, y, w, h);
    this.scrollable = scrollable2;
    addAttribute(Attribute.MouseOver);
    
    addSelfEventHandler(new EventMouse.Drag.Handler()
    {
      public void onEvent(EventMouse.Drag event)
      {
        ControlScrollBar.this.scrollable.movePercentage(event.getDy() / (ControlScrollBar.this.h() - ControlScrollBar.this.getBarHeight()));
      }
    });
    addSelfEventHandler(new EventMouse.Down.Handler()
    {
      public void onEvent(EventMouse.Down event)
      {
        float shownPercentage = ControlScrollBar.this.scrollable.getPercentageShown();
        float percentageIndex = ControlScrollBar.this.scrollable.getPercentageIndex();
        float minPercent = (1.0F - shownPercentage) * percentageIndex;
        float maxPercent = minPercent + shownPercentage;
        float clickedPercentage = ControlScrollBar.this.getRelativeMousePosition().y() / (ControlScrollBar.this.h() - 2.0F);
        clickedPercentage = Math.max(Math.min(clickedPercentage, 1.0F), 0.0F);
        if (clickedPercentage > maxPercent) {
          ControlScrollBar.this.scrollable.setPercentageIndex((clickedPercentage - shownPercentage) / (1.0F - shownPercentage));
        }
        if (clickedPercentage < minPercent) {
          ControlScrollBar.this.scrollable.setPercentageIndex(clickedPercentage / (1.0F - shownPercentage));
        }
      }
    });
  }
  
  public void onUpdateClient() {}
  
  public boolean isEnabled()
  {
    return this.scrollable.getPercentageShown() < 0.99F;
  }
  
  public float getBarHeight()
  {
    return h() * this.scrollable.getPercentageShown();
  }
  
  protected IArea getRenderArea()
  {
    float height = getBarHeight();
    if (height < 6.0F) {
      height = 6.0F;
    }
    float yOffset = ((int)h() - (int)getBarHeight()) * this.scrollable.getPercentageIndex();
    
    return new IArea(0.0F, yOffset, getSize().x(), height);
  }
  
  public void onRenderBackground()
  {
    IArea renderArea = getRenderArea();
    
    Object texture = CraftGUITexture.ScrollDisabled;
    if (isMouseOver()) {
      texture = CraftGUITexture.ScrollHighlighted;
    } else if (isEnabled()) {
      texture = CraftGUITexture.Scroll;
    }
    CraftGUI.Render.texture(texture, renderArea);
  }
}