structure PlayerVec =
struct
  open EntityType
  open PlayerType

  val walkRightFrames =
   #[ PlayerWalkRight1.lerp
    , PlayerWalkRight2.lerp
    , PlayerWalkRight3.lerp
    , PlayerWalkRight4.lerp
    , PlayerWalkRight5.lerp
    , PlayerWalkRight6.lerp
    , PlayerWalkRight7.lerp
    , PlayerWalkRight8.lerp
    ]

  val walkLeftFrames =
   #[ PlayerWalkLeft1.lerp
    , PlayerWalkLeft2.lerp
    , PlayerWalkLeft3.lerp
    , PlayerWalkLeft4.lerp
    , PlayerWalkLeft5.lerp
    , PlayerWalkLeft6.lerp
    , PlayerWalkLeft7.lerp
    , PlayerWalkLeft8.lerp
    ]

  fun getIdle (player, rx, ry, dw, dh, ww, wh) =
    case #facing player of
      FACING_RIGHT =>
        PlayerStandingRight.lerp (rx, ry, 3.0, ww, wh)
    | FACING_LEFT =>
        PlayerStandingLeft.lerp (rx, ry, 3.0, ww, wh)

  fun getWalk (rx, ry, dw, dh, ww, wh, walkFrames, animTimer) =
    let
      val frame = (animTimer div 4) mod Vector.length walkFrames
      val func = Vector.sub (walkFrames, Int.max (frame, 0))
    in
      func (rx, ry, 3.0, ww, wh)
    end

  fun getWhenOnGround (player, rx, ry, dw, dh, ww, wh) =
    case #xAxis player of
      MOVE_RIGHT =>
        getWalk (rx, ry, dw, dh, ww, wh, walkRightFrames, #animTimer player)
    | MOVE_LEFT =>
        getWalk (rx, ry, dw, dh, ww, wh, walkLeftFrames, #animTimer player)
    | STAY_STILL => getIdle (player, rx, ry, dw, dh, ww, wh)

  fun getWhenJumpingRight (player, amt, rx, ry, dw, dh, ww, wh) =
    if amt < 3 then
      PlayerJumpRight1.lerp 
        (rx, ry, 3.0, ww, wh)
    else if amt < 6 then
      PlayerJumpRight2.lerp
        (rx, ry, 3.0, ww, wh)
    else if amt < 9 then
      PlayerJumpRight3.lerp
        (rx, ry, 3.0, ww, wh)
    else if amt < 12 then
      PlayerJumpRight4.lerp
        (rx, ry, 3.0, ww, wh)
    else
      PlayerJumpRight5.lerp
        (rx, ry, 3.0, ww, wh)

  fun getWhenJumpingLeft (player, amt, rx, ry, dw, dh, ww, wh) =
    if amt < 3 then
      PlayerJumpLeft1.lerp 
        (rx, ry, 3.0, ww, wh)
    else if amt < 6 then
      PlayerJumpLeft2.lerp
        (rx, ry, 3.0, ww, wh)
    else if amt < 9 then
      PlayerJumpLeft3.lerp
        (rx, ry, 3.0, ww, wh)
    else if amt < 12 then
      PlayerJumpLeft4.lerp
        (rx, ry, 3.0, ww, wh)
    else
      PlayerJumpLeft5.lerp
        (rx, ry, 3.0, ww, wh)

  fun getWhenJumping (player, amt, rx, ry, dw, dh, ww, wh) =
    case #facing player of
      FACING_RIGHT => getWhenJumpingRight (player, amt, rx, ry, dw, dh, ww, wh)
    | FACING_LEFT => getWhenJumpingLeft (player, amt, rx, ry, dw, dh, ww, wh)

  fun getWhenFalling (player, rx, ry, dw, dh, ww, wh) =
    case #facing player of
      FACING_RIGHT =>
        PlayerJumpRight5.lerp
          (rx, ry, 3.0, ww, wh)
    | FACING_LEFT =>
        PlayerJumpLeft5.lerp
          (rx, ry, 3.0, ww, wh)

  fun getWhenDropping (player, rx, ry, dw, dh, ww, wh) =
    let
      val animTimer = #animTimer player
    in
      getWhenJumping (player, animTimer, rx, ry, dw, dh, ww, wh)
    end

  fun getWhenNotAttacked (player, rx, ry, dw, dh, ww, wh) =
    case #yAxis player of
      ON_GROUND => getWhenOnGround (player, rx, ry, dw, dh, ww, wh)
    | JUMPING amt => getWhenJumping (player, amt, rx, ry, dw, dh, ww, wh)
    | FALLING => getWhenFalling (player, rx, ry, dw, dh, ww, wh)
    | FLOATING _ => getWhenFalling (player, rx, ry, dw, dh, ww, wh)
    | DROP_BELOW_PLATFORM => getWhenDropping (player, rx, ry, dw, dh, ww, wh)

  fun getWhenAttacked (player, amt, rx, ry, dw, dh, ww, wh) =
    case #facing player of
      FACING_RIGHT =>
        (* todo: hurt sprite/animation if amt mod 5 = 0 then *)
          PlayerStandingRight.lerp (rx, ry, 3.0, ww, wh)
    | FACING_LEFT =>
        (* todo: hurt sprite/animation if amt mod 5 = 0 then *)
        PlayerStandingLeft.lerp (rx, ry, 3.0, ww, wh)

  fun helpGet
    (player: player, rx, ry, drawWidth, drawHeight, windowWidth, windowHeight) =
    case #mainAttack player of
      MAIN_ATTACKING amt =>
      let
        val data = (rx, ry, 4.0, windowWidth, windowHeight)
      in
        if amt <= 3 then
          PlayerAttackLeft1.lerp data
        else if amt <= 7 then
          PlayerAttackLeft2.lerp data
        else if amt <= 9 then
          PlayerAttackLeft3.lerp data
        else
          let
            val playerVec = PlayerAttackLeft4.lerp data
            val rx = rx - Real32.fromInt Constants.playerWidth + 25.0
            val ry = ry + (Real32.fromInt Constants.playerHeight / 2.0) + 7.0
            val whipVec = StraightWhip.lerp (rx, ry, 4.0, windowWidth, windowHeight)
          in
            Vector.concat [playerVec, whipVec]
          end
      end
    | _ =>
      case #attacked player of
        NOT_ATTACKED =>
          getWhenNotAttacked
            (player, rx, ry, drawWidth, drawHeight, windowWidth, windowHeight)
      | ATTACKED amt =>
          getWhenAttacked
            ( player
            , amt
            , rx
            , ry
            , drawWidth
            , drawHeight
            , windowWidth
            , windowHeight
            )

  fun get (player: player, width, height) =
    let
      val {x, y, attacked, facing, ...} = player
      val wratio = width / Constants.worldWidthReal
      val hratio = height / Constants.worldHeightReal
    in
      if wratio < hratio then
        let
          val scale = Constants.worldHeightReal * wratio
          val yOffset =
            if height > scale then (height - scale) / 2.0
            else if height < scale then (scale - height) / 2.0
            else 0.0

          val x = Real32.fromInt x * wratio
          val y = Real32.fromInt y * wratio + yOffset

          val realWidth = Constants.playerWidthReal * wratio
          val realHeight = Constants.playerHeightReal * wratio
        in
          helpGet (player, x, y, realWidth, realHeight, width, height)
        end
      else
        let
          val scale = Constants.worldWidthReal * hratio
          val xOffset =
            if width > scale then (width - scale) / 2.0
            else if width < scale then (scale - width) / 2.0
            else 0.0

          val x = Real32.fromInt x * hratio + xOffset
          val y = Real32.fromInt y * hratio

          val realWidth = Constants.playerWidthReal * hratio
          val realHeight = Constants.playerHeightReal * hratio
        in
          helpGet (player, x, y, realWidth, realHeight, width, height)
        end
    end
end