local MAT_GUIDS = { "8b081b", "bd0ff4", "383d8b", "0840d5" }

function onLoad()
  self.addContextMenuItem("Discard 10 cards", shortSupply)
end

-- called by context menu entry
function shortSupply(color)
  local cardPos = self.getPosition()
  local playerNumber = getPlayernumber(cardPos)
  local mat = getObjectFromGUID(MAT_GUIDS[playerNumber])
  if mat == nil then return end

  -- get draw deck and discard pile
  mat.call("getDrawDiscardDecks")
  local drawDeck = mat.getVar("drawDeck")
  local discardPos = mat.getTable("DISCARD_PILE_POSITION")
  if discardPos == nil then
    broadcastToAll("Couldn't retrieve discard position from playermat!", "Red")
    return
  end

  if drawDeck == nil then
    broadcastToColor("Deck not found!", color, "Yellow")
    return
  elseif drawDeck.tag ~= "Deck" then
    broadcastToColor("Deck only contains a single card!", color, "Yellow")
    return
  end

  -- discard cards
  discardPos.y = 0.5
  for i = 1, 10 do
    discardPos.y = discardPos.y + 0.05 * i
    drawDeck.takeObject({
      flip = true,
      position = discardPos
    })
  end
end

-- helper to find playernumber based on position
function getPlayernumber(cardPos)
  if cardPos.x < -42 then
    if cardPos.z > 0 then
      return 1
    else
      return 2
    end
  else
    if cardPos.z > 0 then
      return 3
    else
      return 4
    end
  end
end