class PokemonPokedexInfo_Scene
  #todo add indicator to show which one is the main sprite -
  # also maybe add an indicator in main list for when a sprite has available alts

  Y_POSITION_SMALL = 40#90
  Y_POSITION_BIG = 60
  X_POSITION_PREVIOUS = -30#20
  X_POSITION_SELECTED = 105
  X_POSITION_NEXT = 340#380

  Y_POSITION_BG_SMALL = 70
  Y_POSITION_BG_BIG = 93
  X_POSITION_BG_PREVIOUS = -1
  X_POSITION_BG_SELECTED = 145
  X_POSITION_BG_NEXT = 363

  def drawPageForms
    #@selected_index=0

    @sprites["background"].setBitmap(_INTL("Graphics/Pictures/Pokedex/bg_forms"))
    overlay = @sprites["overlay"].bitmap
    base = Color.new(88, 88, 80)
    shadow = Color.new(168, 184, 184)

    #alts_list= pbGetAvailableAlts
    @selected_index = 0
    update_displayed
  end

  def init_selected_bg
    @sprites["bgSelected_previous"] = IconSprite.new(0, 0, @viewport)
    @sprites["bgSelected_previous"].x = X_POSITION_BG_PREVIOUS
    @sprites["bgSelected_previous"].y = Y_POSITION_BG_SMALL
    @sprites["bgSelected_previous"].setBitmap(_INTL("Graphics/Pictures/Pokedex/bg_forms_selected_small"))
    @sprites["bgSelected_previous"].visible = false

    @sprites["bgSelected_center"] = IconSprite.new(0, 0, @viewport)
    @sprites["bgSelected_center"].x = X_POSITION_BG_SELECTED
    @sprites["bgSelected_center"].y = Y_POSITION_BG_BIG
    @sprites["bgSelected_center"].setBitmap(_INTL("Graphics/Pictures/Pokedex/bg_forms_selected_large"))
    @sprites["bgSelected_center"].visible = false

    @sprites["bgSelected_next"] = IconSprite.new(0, 0, @viewport)
    @sprites["bgSelected_next"].x = X_POSITION_BG_NEXT
    @sprites["bgSelected_next"].y = Y_POSITION_BG_SMALL
    @sprites["bgSelected_next"].setBitmap(_INTL("Graphics/Pictures/Pokedex/bg_forms_selected_small"))
    @sprites["bgSelected_next"].visible = false

  end

  def initializeSpritesPage(altsList)
    init_selected_bg
    @speciesData = getSpecies(@species)
    @selected_index = 0
    @sprites["selectedSprite"] = IconSprite.new(0, 0, @viewport)
    @sprites["selectedSprite"].x = X_POSITION_SELECTED
    @sprites["selectedSprite"].y = Y_POSITION_BIG
    @sprites["selectedSprite"].z = 999999
    @sprites["selectedSprite"].visible = false
    @sprites["selectedSprite"].zoom_x = 1
    @sprites["selectedSprite"].zoom_y = 1

    @sprites["previousSprite"] = IconSprite.new(0, 0, @viewport)
    @sprites["previousSprite"].x = X_POSITION_PREVIOUS
    @sprites["previousSprite"].y = Y_POSITION_SMALL
    @sprites["previousSprite"].visible = false
    @sprites["previousSprite"].zoom_x = Settings::FRONTSPRITE_SCALE#/2
    @sprites["previousSprite"].zoom_y = Settings::FRONTSPRITE_SCALE#/2

    @sprites["nextSprite"] = IconSprite.new(0, 0, @viewport)
    @sprites["nextSprite"].x = X_POSITION_NEXT
    @sprites["nextSprite"].y = Y_POSITION_SMALL
    @sprites["nextSprite"].visible = false
    @sprites["nextSprite"].zoom_x = Settings::FRONTSPRITE_SCALE#/2
    @sprites["nextSprite"].zoom_y = Settings::FRONTSPRITE_SCALE#/2

    @sprites["selectedSprite"].z = 9999999
    @sprites["previousSprite"].z = 9999999
    @sprites["nextSprite"].z = 9999999

    @sprites["selectedSprite"].setBitmap(altsList[@selected_index])

    if altsList.size >= 2
      @sprites["nextSprite"].setBitmap(altsList[@selected_index + 1])
      @sprites["nextSprite"].visible = true
    end

    if altsList.size >= 3
      @sprites["previousSprite"].setBitmap(altsList[-1])
      @sprites["previousSprite"].visible = true
    end

  end

  POSSIBLE_ALTS = %w[a b c d e f g h i j k x]

  def pbGetAvailableForms
    return pbGetAvailableAlts
  end

  def hide_all_selected_windows
    @sprites["bgSelected_previous"].visible = false if @sprites["bgSelected_previous"]
    @sprites["bgSelected_center"].visible = false if @sprites["bgSelected_center"]
    @sprites["bgSelected_next"].visible = false if @sprites["bgSelected_next"]
  end

  def update_selected
    hide_all_selected_windows
    previous_index = @selected_index == 0 ? @available.size - 1 : @selected_index - 1
    next_index = @selected_index == @available.size - 1 ? 0 : @selected_index + 1

    @sprites["bgSelected_previous"].visible = true if is_main_sprite(previous_index) && @available.size > 2
    @sprites["bgSelected_center"].visible = true if is_main_sprite(@selected_index)
    @sprites["bgSelected_next"].visible = true if is_main_sprite(next_index) && @available.size > 1
  end

  def update_displayed
    @sprites["selectedSprite"].setBitmap(@available[@selected_index])
    nextIndex = @selected_index + 1
    previousIndex = @selected_index - 1
    if nextIndex > @available.size - 1
      nextIndex = 0
    end
    if previousIndex < 0
      previousIndex = @available.size - 1
    end
    @sprites["previousSprite"].visible = false if @available.size <= 2
    @sprites["nextSprite"].visible = false if @available.size <= 1

    @sprites["previousSprite"].setBitmap(@available[previousIndex]) if previousIndex != nextIndex
    @sprites["selectedSprite"].setBitmap(@available[@selected_index])
    @sprites["nextSprite"].setBitmap(@available[nextIndex])

    update_selected
  end

  def pbGetAvailableAlts
    ret = []
    return ret if !@species
    dexNum = getDexNumberForSpecies(@species)
    isFusion = dexNum > NB_POKEMON
    if !isFusion
      ret << Settings::BATTLERS_FOLDER + dexNum.to_s + "/" + dexNum.to_s + ".png"
      return ret
    end
    body_id = getBodyID(@species)
    head_id = getHeadID(@species, body_id)

    baseFilename = head_id.to_s + "." + body_id.to_s
    baseFilePath = Settings::CUSTOM_BATTLERS_FOLDER + baseFilename + ".png"
    if pbResolveBitmap(baseFilePath)
      ret << baseFilePath
    end
    POSSIBLE_ALTS.each { |alt_letter|
      altFilePath = Settings::CUSTOM_BATTLERS_FOLDER + baseFilename + alt_letter + ".png"
      if pbResolveBitmap(altFilePath)
        ret << altFilePath
      end
    }
    ret << Settings::BATTLERS_FOLDER + head_id.to_s + "/" + baseFilename + ".png"
    return ret
  end

  def pbChooseForm
    loop do
      @sprites["uparrow"].visible = true
      @sprites["downarrow"].visible = true
      Graphics.update
      Input.update
      pbUpdate
      if Input.trigger?(Input::RIGHT)
        pbPlayCursorSE
        @selected_index -= 1 #(index+@available.length-1)%@available.length
        if @selected_index < 0
          @selected_index = @available.size - 1
        end
        update_displayed
      elsif Input.trigger?(Input::LEFT)
        pbPlayCursorSE
        @selected_index += 1 #= (index+1)%@available.length
        if @selected_index > @available.size - 1
          @selected_index = 0
        end
        update_displayed
      elsif Input.trigger?(Input::BACK)
        pbPlayCancelSE
        break
      elsif Input.trigger?(Input::USE)
        pbPlayDecisionSE
        if select_sprite
          @endscene = true
          break
        end
      end
    end
    @sprites["uparrow"].visible = false
    @sprites["downarrow"].visible = false
  end

  def is_main_sprite(index = nil)
    return false if !@available
    if index == nil
      index = @selected_index
    end
    return true if @available.size <= 1
    if @speciesData.always_use_generated
      selected_sprite = @available[index]
      return selected_sprite.start_with?(Settings::BATTLERS_FOLDER)
    end
    return index == 0
  end

  def select_sprite
    if is_main_sprite
      pbMessage("This sprite is already the displayed sprite")
    else
      if pbConfirmMessage(_INTL('Would you like to use this sprite instead of the current sprite?'))
        swap_main_sprite()
        return true
      end
    end
    return false
  end

  def swap_main_sprite
    begin
      old_main_sprite = @available[0]
      new_main_sprite = @available[@selected_index]

      if main_sprite_is_non_custom()
        @speciesData.set_always_use_generated_sprite(false)
        return
        # new_name_without_ext = File.basename(old_main_sprite, ".png")
        # new_name_without_letter=new_name_without_ext.chop
        # File.rename(new_main_sprite, Settings::CUSTOM_BATTLERS_FOLDER+new_name_without_letter + ".png")
      end

      if new_main_sprite.start_with?(Settings::BATTLERS_FOLDER)
        @speciesData.set_always_use_generated_sprite(true)
        return
        # new_name_without_ext = File.basename(old_main_sprite, ".png")
        # File.rename(old_main_sprite, Settings::CUSTOM_BATTLERS_FOLDER+new_name_without_ext+"x" + ".png")x
        # return
      end
      File.rename(new_main_sprite, new_main_sprite + "temp")
      File.rename(old_main_sprite, new_main_sprite)
      File.rename(new_main_sprite + "temp", old_main_sprite)
    rescue
      pbMessage("There was an error while swapping the sprites. Please save and restart the game as soon as possible.")
    end
  end

  def main_sprite_is_non_custom()
    speciesData = getSpecies(@species)
    return speciesData.always_use_generated || @available.size <= 1
    #dégueu, je sais - si le 1er element de la liste finit par une lettre (le 1er element devrait etre considéré comme le main), ça veut dire que le main est non-custom
    # speciesData.set_always_use_generated_sprite(true)
    # return POSSIBLE_ALTS.include?(File.basename(old_main_sprite, ".png")[-1])
  end

end