class WindowCursorRect < Rect
  def initialize(window)
    super(0, 0, 0, 0)
    @window = window
  end

  def empty
    return unless needs_update?(0, 0, 0, 0)

    set(0, 0, 0, 0)
  end

  def empty?
    return self.x == 0 && self.y == 0 && self.width == 0 && self.height == 0
  end

  def set(x, y, width, height)
    return unless needs_update?(x, y, width, height)

    super(x, y, width, height)

    @window.width = @window.width
  end

  def height=(value)
    super(value)
    @window.width = @window.width
  end

  def width=(value)
    super(value)
    @window.width = @window.width
  end

  def x=(value)
    super(value)
    @window.width = @window.width
  end

  def y=(value)
    super(value)
    @window.width = @window.width
  end

  private

  def needs_update?(x, y, width, height)
    return self.x != x || self.y != y || self.width != width || self.height != height
  end
end


class Window
  attr_reader :tone
  attr_reader :color
  attr_reader :blend_type
  attr_reader :contents_blend_type
  attr_reader :viewport
  attr_reader :contents
  attr_reader :ox
  attr_reader :oy
  attr_reader :x
  attr_reader :y
  attr_reader :z
  attr_reader :width
  attr_reader :active
  attr_reader :pause
  attr_reader :height
  attr_reader :opacity
  attr_reader :back_opacity
  attr_reader :contents_opacity
  attr_reader :visible
  attr_reader :cursor_rect
  attr_reader :openness
  attr_reader :stretch

  def windowskin
    @_windowskin
  end

  def initialize(viewport=nil)
    @sprites={}
    @spritekeys=[
       "back",
       "corner0","side0","scroll0",
       "corner1","side1","scroll1",
       "corner2","side2","scroll2",
       "corner3","side3","scroll3",
       "cursor","contents","pause"
    ]
    @sidebitmaps=[nil,nil,nil,nil]
    @cursorbitmap=nil
    @bgbitmap=nil
    @viewport=viewport
    for i in @spritekeys
      @sprites[i]=Sprite.new(@viewport)
    end
    @disposed=false
    @tone=Tone.new(0,0,0)
    @color=Color.new(0,0,0,0)
    @blankcontents=Bitmap.new(1,1) # RGSS2 requires this
    @contents=@blankcontents
    @_windowskin=nil
    @rpgvx=false # Set to true to emulate RPGVX windows
    @x=0
    @y=0
    @width=0
    @openness=255
    @height=0
    @ox=0
    @oy=0
    @z=0
    @stretch=true
    @visible=true
    @active=true
    @blend_type=0
    @contents_blend_type=0
    @opacity=255
    @back_opacity=255
    @contents_opacity=255
    @cursor_rect=WindowCursorRect.new(self)
    @cursorblink=0
    @cursoropacity=255
    @pause=false
    @pauseopacity=255
    @pauseframe=0
    privRefresh(true)
  end

  def dispose
    if !self.disposed?
      for i in @sprites
        i[1].dispose if i[1]
        @sprites[i[0]]=nil
      end
      for i in 0...@sidebitmaps.length
        @sidebitmaps[i].dispose if @sidebitmaps[i]
        @sidebitmaps[i]=nil
      end
      @blankcontents.dispose
      @cursorbitmap.dispose if @cursorbitmap
      @backbitmap.dispose if @backbitmap
      @sprites.clear
      @sidebitmaps.clear
      @_windowskin=nil
      @_contents=nil
      @disposed=true
    end
  end

  def openness=(value)
    @openness=value
    @openness=0 if @openness<0
    @openness=255 if @openness>255
    privRefresh
  end

  def stretch=(value)
    @stretch=value
    privRefresh(true)
  end

  def visible=(value)
    @visible=value
    privRefresh
  end

  def viewport=(value)
    @viewport=value
    for i in @spritekeys
      @sprites[i].dispose
      if @sprites[i].is_a?(Sprite)
        @sprites[i]=Sprite.new(@viewport)
      else
        @sprites[i]=nil
      end
    end
    privRefresh(true)
  end

  def z=(value)
    @z=value
    privRefresh
  end

  def disposed?
    return @disposed
  end

  def contents=(value)
    @contents=value
    privRefresh
  end

  def windowskin=(value)
    @_windowskin=value
    if value && value.is_a?(Bitmap) && !value.disposed? && value.width==128
      @rpgvx=true
    else
      @rpgvx=false
    end
    privRefresh(true)
  end

  def ox=(value)
    @ox=value
    privRefresh
  end

  def active=(value)
    @active=value
    privRefresh(true)
  end

  def cursor_rect=(value)
    if !value
      @cursor_rect.empty
    else
      @cursor_rect.set(value.x,value.y,value.width,value.height)
    end
  end

  def oy=(value)
    @oy=value
    privRefresh
  end

  def width=(value)
    @width=value
    privRefresh(true)
  end

  def height=(value)
    @height=value
    privRefresh(true)
  end

  def pause=(value)
    @pause=value
    @pauseopacity=0 if !value
    privRefresh
  end

  def x=(value)
    @x=value
    privRefresh
  end

  def y=(value)
    @y=value
    privRefresh
  end

  def opacity=(value)
    @opacity=value
    @opacity=0 if @opacity<0
    @opacity=255 if @opacity>255
    privRefresh
  end

  def back_opacity=(value)
    @back_opacity=value
    @back_opacity=0 if @back_opacity<0
    @back_opacity=255 if @back_opacity>255
    privRefresh
  end

  def contents_opacity=(value)
    @contents_opacity=value
    @contents_opacity=0 if @contents_opacity<0
    @contents_opacity=255 if @contents_opacity>255
    privRefresh
  end

  def tone=(value)
    @tone=value
    privRefresh
  end

  def color=(value)
    @color=value
    privRefresh
  end

  def blend_type=(value)
    @blend_type=value
    privRefresh
  end

  def flash(color,duration)
    return if disposed?
    for i in @sprites
      i[1].flash(color,duration)
    end
  end

  def update
    return if disposed?
    mustchange=false
    if @active
      if @cursorblink==0
        @cursoropacity-=8
        @cursorblink=1 if @cursoropacity<=128
      else
        @cursoropacity+=8
        @cursorblink=0 if @cursoropacity>=255
      end
      mustchange=true if !@cursor_rect.empty?
    else
      mustchange=true if @cursoropacity!=128
      @cursoropacity=128
    end
    if @pause
      @pauseframe=(Graphics.frame_count / 8) % 4
      @pauseopacity=[@pauseopacity+64,255].min
      mustchange=true
    end
    privRefresh if mustchange
    for i in @sprites
      i[1].update
    end
  end

  private

  def ensureBitmap(bitmap,dwidth,dheight)
    if !bitmap||bitmap.disposed?||bitmap.width<dwidth||bitmap.height<dheight
       bitmap.dispose if bitmap
       bitmap=Bitmap.new([1,dwidth].max,[1,dheight].max)
    end
    return bitmap
  end

  def tileBitmap(dstbitmap,dstrect,srcbitmap,srcrect)
    return if !srcbitmap || srcbitmap.disposed?
    left=dstrect.x
    top=dstrect.y
    y=0;loop do break unless y<dstrect.height
      x=0;loop do break unless x<dstrect.width
        dstbitmap.blt(x+left,y+top,srcbitmap,srcrect)
        x+=srcrect.width
      end
      y+=srcrect.height
    end
  end

  def privRefresh(changeBitmap=false)
    return if self.disposed?
    backopac=self.back_opacity*self.opacity/255
    contopac=self.contents_opacity
    cursoropac=@cursoropacity*contopac/255
    for i in 0...4
      @sprites["corner#{i}"].bitmap=@_windowskin
      @sprites["scroll#{i}"].bitmap=@_windowskin
    end
    @sprites["pause"].bitmap=@_windowskin
    @sprites["contents"].bitmap=@contents
    if @_windowskin && !@_windowskin.disposed?
      for i in 0...4
        @sprites["corner#{i}"].opacity=@opacity
        @sprites["corner#{i}"].tone=@tone
        @sprites["corner#{i}"].color=@color
        @sprites["corner#{i}"].blend_type=@blend_type
        @sprites["corner#{i}"].visible=@visible
        @sprites["side#{i}"].opacity=@opacity
        @sprites["side#{i}"].tone=@tone
        @sprites["side#{i}"].color=@color
        @sprites["side#{i}"].blend_type=@blend_type
        @sprites["side#{i}"].visible=@visible
        @sprites["scroll#{i}"].opacity=@opacity
        @sprites["scroll#{i}"].tone=@tone
        @sprites["scroll#{i}"].blend_type=@blend_type
        @sprites["scroll#{i}"].color=@color
        @sprites["scroll#{i}"].visible=@visible
      end
      for i in ["back","cursor","pause","contents"]
        @sprites[i].color=@color
        @sprites[i].tone=@tone
        @sprites[i].blend_type=@blend_type
      end
      @sprites["contents"].blend_type=@contents_blend_type
      @sprites["back"].opacity=backopac
      @sprites["contents"].opacity=contopac
      @sprites["cursor"].opacity=cursoropac
      @sprites["pause"].opacity=@pauseopacity
      @sprites["back"].visible=@visible
      @sprites["contents"].visible=@visible && @openness==255
      @sprites["pause"].visible=@visible && @pause
      @sprites["cursor"].visible=@visible && @openness==255
      hascontents=(@contents && !@contents.disposed?)
      @sprites["scroll0"].visible = @visible && hascontents && @oy > 0
      @sprites["scroll1"].visible = @visible && hascontents && @ox > 0
      @sprites["scroll2"].visible = @visible && hascontents &&
         (@contents.width - @ox) > @width-32
      @sprites["scroll3"].visible = @visible && hascontents &&
         (@contents.height - @oy) > @height-32
    else
      for i in 0...4
        @sprites["corner#{i}"].visible=false
        @sprites["side#{i}"].visible=false
        @sprites["scroll#{i}"].visible=false
      end
      @sprites["contents"].visible=@visible && @openness==255
      @sprites["contents"].color=@color
      @sprites["contents"].tone=@tone
      @sprites["contents"].blend_type=@contents_blend_type
      @sprites["contents"].opacity=contopac
      @sprites["back"].visible=false
      @sprites["pause"].visible=false
      @sprites["cursor"].visible=false
    end
    for i in @sprites
      i[1].z=@z
    end
    if @rpgvx
      @sprites["cursor"].z=@z # For Compatibility
      @sprites["contents"].z=@z # For Compatibility
      @sprites["pause"].z=@z # For Compatibility
    else
      @sprites["cursor"].z=@z+1 # For Compatibility
      @sprites["contents"].z=@z+2 # For Compatibility
      @sprites["pause"].z=@z+2 # For Compatibility
    end
    if @rpgvx
      trimX=64
      trimY=0
      backRect=Rect.new(0,0,64,64)
      blindsRect=Rect.new(0,64,64,64)
    else
      trimX=128
      trimY=0
      backRect=Rect.new(0,0,128,128)
      blindsRect=nil
    end
    @sprites["corner0"].src_rect.set(trimX,trimY+0,16,16);
    @sprites["corner1"].src_rect.set(trimX+48,trimY+0,16,16);
    @sprites["corner2"].src_rect.set(trimX,trimY+48,16,16);
    @sprites["corner3"].src_rect.set(trimX+48,trimY+48,16,16);
    @sprites["scroll0"].src_rect.set(trimX+24, trimY+16, 16, 8) # up
    @sprites["scroll3"].src_rect.set(trimX+24, trimY+40, 16, 8) # down
    @sprites["scroll1"].src_rect.set(trimX+16, trimY+24, 8, 16) # left
    @sprites["scroll2"].src_rect.set(trimX+40, trimY+24, 8, 16) # right
    cursorX=trimX
    cursorY=trimY+64
    sideRects=[
       Rect.new(trimX+16,trimY+0,32,16),
       Rect.new(trimX,trimY+16,16,32),
       Rect.new(trimX+48,trimY+16,16,32),
       Rect.new(trimX+16,trimY+48,32,16)
    ]
    if @width>32 && @height>32
      @sprites["contents"].src_rect.set(@ox,@oy,@width-32,@height-32)
    else
      @sprites["contents"].src_rect.set(0,0,0,0)
    end
    pauseRects=[
       trimX+32,trimY+64,
       trimX+48,trimY+64,
       trimX+32,trimY+80,
       trimX+48,trimY+80,
    ]
    pauseWidth=16
    pauseHeight=16
    @sprites["pause"].src_rect.set(
       pauseRects[@pauseframe*2],
       pauseRects[@pauseframe*2+1],
       pauseWidth,pauseHeight
    )
    @sprites["pause"].x=@x+(@width/2)-(pauseWidth/2)
    @sprites["pause"].y=@y+@height-16 # 16 refers to skin margin
    @sprites["contents"].x=@x+16
    @sprites["contents"].y=@y+16
    @sprites["corner0"].x=@x
    @sprites["corner0"].y=@y
    @sprites["corner1"].x=@x+@width-16
    @sprites["corner1"].y=@y
    @sprites["corner2"].x=@x
    @sprites["corner2"].y=@y+@height-16
    @sprites["corner3"].x=@x+@width-16
    @sprites["corner3"].y=@y+@height-16
    @sprites["side0"].x=@x+16
    @sprites["side0"].y=@y
    @sprites["side1"].x=@x
    @sprites["side1"].y=@y+16
    @sprites["side2"].x=@x+@width-16
    @sprites["side2"].y=@y+16
    @sprites["side3"].x=@x+16
    @sprites["side3"].y=@y+@height-16
    @sprites["scroll0"].x = @x+@width / 2 - 8
    @sprites["scroll0"].y = @y+8
    @sprites["scroll1"].x = @x+8
    @sprites["scroll1"].y = @y+@height / 2 - 8
    @sprites["scroll2"].x = @x+@width - 16
    @sprites["scroll2"].y = @y+@height / 2 - 8
    @sprites["scroll3"].x = @x+@width / 2 - 8
    @sprites["scroll3"].y = @y+@height - 16
    @sprites["back"].x=@x+2
    @sprites["back"].y=@y+2
    @sprites["cursor"].x=@x+16+@cursor_rect.x
    @sprites["cursor"].y=@y+16+@cursor_rect.y
    if changeBitmap && @_windowskin && !@_windowskin.disposed?
      width=@cursor_rect.width
      height=@cursor_rect.height
      if width > 0 && height > 0
        cursorrects=[
           # sides
           Rect.new(cursorX+2, cursorY+0, 28, 2),
           Rect.new(cursorX+0, cursorY+2, 2, 28),
           Rect.new(cursorX+30, cursorY+2, 2, 28),
           Rect.new(cursorX+2, cursorY+30, 28, 2),
           # corners
           Rect.new(cursorX+0, cursorY+0, 2, 2),
           Rect.new(cursorX+30, cursorY+0, 2, 2),
           Rect.new(cursorX+0, cursorY+30, 2, 2),
           Rect.new(cursorX+30, cursorY+30, 2, 2),
           # back
           Rect.new(cursorX+2, cursorY+2, 28, 28)
        ]
        margin=2
        fullmargin=4
        @cursorbitmap = ensureBitmap(@cursorbitmap, width, height)
        @cursorbitmap.clear
        @sprites["cursor"].bitmap=@cursorbitmap
        @sprites["cursor"].src_rect.set(0,0,width,height)
        rect = Rect.new(margin,margin,
           width - fullmargin, height - fullmargin)
        @cursorbitmap.stretch_blt(rect, @_windowskin, cursorrects[8])
        @cursorbitmap.blt(0, 0, @_windowskin, cursorrects[4])# top left
        @cursorbitmap.blt(width-margin, 0, @_windowskin, cursorrects[5]) # top right
        @cursorbitmap.blt(0, height-margin, @_windowskin, cursorrects[6]) # bottom right
        @cursorbitmap.blt(width-margin, height-margin, @_windowskin, cursorrects[7]) # bottom left
        rect = Rect.new(margin, 0,
           width - fullmargin, margin)
        @cursorbitmap.stretch_blt(rect, @_windowskin, cursorrects[0])
        rect = Rect.new(0, margin,
           margin, height - fullmargin)
        @cursorbitmap.stretch_blt(rect, @_windowskin, cursorrects[1])
        rect = Rect.new(width - margin, margin,
           margin, height - fullmargin)
        @cursorbitmap.stretch_blt(rect, @_windowskin, cursorrects[2])
        rect = Rect.new(margin, height-margin,
           width - fullmargin, margin)
        @cursorbitmap.stretch_blt(rect, @_windowskin, cursorrects[3])
      else
        @sprites["cursor"].visible=false
        @sprites["cursor"].src_rect.set(0,0,0,0)
      end
      for i in 0...4
        dwidth  = (i==0 || i==3) ? @width-32 : 16
        dheight = (i==0 || i==3) ? 16 : @height-32
        @sidebitmaps[i]=ensureBitmap(@sidebitmaps[i],dwidth,dheight)
        @sprites["side#{i}"].bitmap=@sidebitmaps[i]
        @sprites["side#{i}"].src_rect.set(0,0,dwidth,dheight)
        @sidebitmaps[i].clear
        if sideRects[i].width>0 && sideRects[i].height>0
          @sidebitmaps[i].stretch_blt(@sprites["side#{i}"].src_rect,
             @_windowskin,sideRects[i])
        end
      end
      backwidth=@width-4
      backheight=@height-4
      if backwidth>0 && backheight>0
        @backbitmap=ensureBitmap(@backbitmap,backwidth,backheight)
        @sprites["back"].bitmap=@backbitmap
        @sprites["back"].src_rect.set(0,0,backwidth,backheight)
        @backbitmap.clear
        if @stretch
          @backbitmap.stretch_blt(@sprites["back"].src_rect,@_windowskin,backRect)
        else
          tileBitmap(@backbitmap,@sprites["back"].src_rect,@_windowskin,backRect)
        end
        if blindsRect
          tileBitmap(@backbitmap,@sprites["back"].src_rect,@_windowskin,blindsRect)
        end
      else
        @sprites["back"].visible=false
        @sprites["back"].src_rect.set(0,0,0,0)
      end
    end
    if @openness!=255
      opn=@openness/255.0
      for k in @spritekeys
        sprite=@sprites[k]
        ratio=(@height<=0) ? 0 : (sprite.y-@y)*1.0/@height
        sprite.zoom_y=opn
        sprite.oy=0
        sprite.y=(@y+(@height/2.0)+(@height*ratio*opn)-(@height/2*opn)).floor
      end
    else
      for k in @spritekeys
        sprite=@sprites[k]
        sprite.zoom_y=1.0
      end
    end
    i=0
    # Ensure Z order
    for k in @spritekeys
      sprite=@sprites[k]
      y=sprite.y
      sprite.y=i
      sprite.oy=(sprite.zoom_y<=0) ? 0 : (i-y)/sprite.zoom_y
    end
  end
end