def pbEachNaturalMove(pokemon)
  movelist=pokemon.getMoveList
  for i in movelist
    yield i[1],i[0]
  end
end

def pbHasRelearnableMove?(pokemon)
  return pbGetRelearnableMoves(pokemon).length>0
end

def pbGetRelearnableMoves(pokemon)
  return [] if !pokemon || pokemon.egg? || pokemon.shadowPokemon?
  moves=[]
  pbEachNaturalMove(pokemon) { |move,level|
    if level<=pokemon.level && !pokemon.hasMove?(move)
      moves.push(move) if !moves.include?(move)
    end
  }
  tmoves=[]
  if pokemon.firstmoves
    for i in pokemon.firstmoves
      tmoves.push(i) if !pokemon.hasMove?(i) && !moves.include?(i)
    end
  end
  moves=tmoves+moves
  return moves|[]   # remove duplicates
end



################################################################################
# Scene class for handling appearance of the screen
################################################################################
class MoveRelearner_Scene
  VISIBLEMOVES = 4

  def pbDisplay(msg,brief=false)
    UIHelper.pbDisplay(@sprites["msgwindow"],msg,brief) { pbUpdate }
  end

  def pbConfirm(msg)
    UIHelper.pbConfirm(@sprites["msgwindow"],msg) { pbUpdate }
  end

  def pbUpdate
    pbUpdateSpriteHash(@sprites)
  end

  def pbStartScene(pokemon,moves)
    @pokemon=pokemon
    @moves=moves
    moveCommands=[]
    moves.each { |m| moveCommands.push(GameData::Move.get(m).name) }
    # Create sprite hash
    @viewport=Viewport.new(0,0,Graphics.width,Graphics.height)
    @viewport.z=99999
    @sprites={}
    addBackgroundPlane(@sprites,"bg","reminderbg",@viewport)
    @sprites["pokeicon"]=PokemonIconSprite.new(@pokemon,@viewport)
    @sprites["pokeicon"].setOffset(PictureOrigin::Center)
    @sprites["pokeicon"].x=320
    @sprites["pokeicon"].y=84
    @sprites["background"]=IconSprite.new(0,0,@viewport)
    @sprites["background"].setBitmap("Graphics/Pictures/reminderSel")
    @sprites["background"].y=78
    @sprites["background"].src_rect=Rect.new(0,72,258,72)
    @sprites["overlay"]=BitmapSprite.new(Graphics.width,Graphics.height,@viewport)
    pbSetSystemFont(@sprites["overlay"].bitmap)
    @sprites["commands"]=Window_CommandPokemon.new(moveCommands,32)
    @sprites["commands"].height=32*(VISIBLEMOVES+1)
    @sprites["commands"].visible=false
    @sprites["msgwindow"]=Window_AdvancedTextPokemon.new("")
    @sprites["msgwindow"].visible=false
    @sprites["msgwindow"].viewport=@viewport
    @typebitmap=AnimatedBitmap.new(_INTL("Graphics/Pictures/types"))
    pbDrawMoveList
    pbDeactivateWindows(@sprites)
    # Fade in all sprites
    pbFadeInAndShow(@sprites) { pbUpdate }
  end

  def pbDrawMoveList
    overlay=@sprites["overlay"].bitmap
    overlay.clear
    type1_number = GameData::Type.get(@pokemon.type1).id_number
    type2_number = GameData::Type.get(@pokemon.type2).id_number
    type1rect=Rect.new(0, type1_number * 28, 64, 28)
    type2rect=Rect.new(0, type2_number * 28, 64, 28)
    if @pokemon.type1==@pokemon.type2
      overlay.blt(400,70,@typebitmap.bitmap,type1rect)
    else
      overlay.blt(366,70,@typebitmap.bitmap,type1rect)
      overlay.blt(436,70,@typebitmap.bitmap,type2rect)
    end
    textpos=[
       [_INTL("Teach which move?"),16,8,0,Color.new(88,88,80),Color.new(168,184,184)]
    ]
    imagepos=[]
    yPos=82
    for i in 0...VISIBLEMOVES
      moveobject=@moves[@sprites["commands"].top_item+i]
      if moveobject
        moveData=GameData::Move.get(moveobject)
        type_number = GameData::Type.get(moveData.type).id_number
        imagepos.push(["Graphics/Pictures/types", 12, yPos + 2, 0, type_number * 28, 64, 28])
        textpos.push([moveData.name,80,yPos,0,Color.new(248,248,248),Color.new(0,0,0)])
        if moveData.total_pp>0
          textpos.push([_INTL("PP"),112,yPos+32,0,Color.new(64,64,64),Color.new(176,176,176)])
          textpos.push([_INTL("{1}/{1}",moveData.total_pp),230,yPos+32,1,
             Color.new(64,64,64),Color.new(176,176,176)])
        else
          textpos.push(["-",80,yPos,0,Color.new(64,64,64),Color.new(176,176,176)])
          textpos.push(["--",228,yPos+32,1,Color.new(64,64,64),Color.new(176,176,176)])
        end
      end
      yPos+=64
    end
    imagepos.push(["Graphics/Pictures/reminderSel",
       0,78+(@sprites["commands"].index-@sprites["commands"].top_item)*64,
       0,0,258,72])
    selMoveData=GameData::Move.get(@moves[@sprites["commands"].index])
    basedamage=selMoveData.base_damage
    category=selMoveData.category
    accuracy=selMoveData.accuracy
    textpos.push([_INTL("CATEGORY"),272,114,0,Color.new(248,248,248),Color.new(0,0,0)])
    textpos.push([_INTL("POWER"),272,146,0,Color.new(248,248,248),Color.new(0,0,0)])
    textpos.push([basedamage<=1 ? basedamage==1 ? "???" : "---" : sprintf("%d",basedamage),
          468,146,2,Color.new(64,64,64),Color.new(176,176,176)])
    textpos.push([_INTL("ACCURACY"),272,178,0,Color.new(248,248,248),Color.new(0,0,0)])
    textpos.push([accuracy==0 ? "---" : sprintf("%d%",accuracy),
          468,178,2,Color.new(64,64,64),Color.new(176,176,176)])
    pbDrawTextPositions(overlay,textpos)
    imagepos.push(["Graphics/Pictures/category",436,116,0,category*28,64,28])
    if @sprites["commands"].index<@moves.length-1
      imagepos.push(["Graphics/Pictures/reminderButtons",48,350,0,0,76,32])
    end
    if @sprites["commands"].index>0
      imagepos.push(["Graphics/Pictures/reminderButtons",134,350,76,0,76,32])
    end
    pbDrawImagePositions(overlay,imagepos)
    drawTextEx(overlay,272,210,230,5,selMoveData.description,
       Color.new(64,64,64),Color.new(176,176,176))
  end

  # Processes the scene
  def pbChooseMove
    oldcmd=-1
    pbActivateWindow(@sprites,"commands") {
      loop do
        oldcmd=@sprites["commands"].index
        Graphics.update
        Input.update
        pbUpdate
        if @sprites["commands"].index!=oldcmd
          @sprites["background"].x=0
          @sprites["background"].y=78+(@sprites["commands"].index-@sprites["commands"].top_item)*64
          pbDrawMoveList
        end
        if Input.trigger?(Input::B)
          return 0
        elsif Input.trigger?(Input::C)
          return @moves[@sprites["commands"].index]
        end
      end
    }
  end

  # End the scene here
  def pbEndScene
    pbFadeOutAndHide(@sprites) { pbUpdate }
    pbDisposeSpriteHash(@sprites)
    @typebitmap.dispose
    @viewport.dispose
  end
end



# Screen class for handling game logic
class MoveRelearnerScreen
  def initialize(scene)
    @scene = scene
  end

  def pbStartScreen(pokemon)
    moves=pbGetRelearnableMoves(pokemon)
    @scene.pbStartScene(pokemon,moves)
    loop do
      move=@scene.pbChooseMove
      if move
        if @scene.pbConfirm(_INTL("Teach {1}?",GameData::Move.get(move).name))
          if pbLearnMove(pokemon,move)
            @scene.pbEndScene
            return true
          end
        end
      elsif @scene.pbConfirm(_INTL("Give up trying to teach a new move to {1}?",pokemon.name))
        @scene.pbEndScene
        return false
      end
    end
  end
end



def pbRelearnMoveScreen(pokemon)
  retval = true
  pbFadeOutIn {
    scene = MoveRelearner_Scene.new
    screen = MoveRelearnerScreen.new(scene)
    retval = screen.pbStartScreen(pokemon)
  }
  return retval
end