local board = {
  route_length = 40,
  finish_progress = 40,
  start = {
    red = 1,
    yellow = 11,
    blue = 21,
    green = 31
  },
  homes = {
    red = {
      { x = 92, y = 132 },
      { x = 142, y = 132 }
    },
    yellow = {
      { x = 518, y = 132 },
      { x = 568, y = 132 }
    },
    blue = {
      { x = 518, y = 548 },
      { x = 568, y = 548 }
    },
    green = {
      { x = 92, y = 548 },
      { x = 142, y = 548 }
    }
  },
  finish = {
    red = {
      { x = 290, y = 330 },
      { x = 250, y = 330 }
    },
    yellow = {
      { x = 350, y = 330 },
      { x = 390, y = 330 }
    },
    blue = {
      { x = 350, y = 390 },
      { x = 390, y = 390 }
    },
    green = {
      { x = 290, y = 390 },
      { x = 250, y = 390 }
    }
  },
  route = {}
}

local function add(x, y)
  table.insert(board.route, { x = x, y = y })
end

for i = 0, 9 do add(200 + i * 32, 104) end
for i = 0, 9 do add(520, 136 + i * 32) end
for i = 0, 9 do add(488 - i * 32, 456) end
for i = 0, 9 do add(168, 424 - i * 32) end

function board.home_position(piece)
  local index = piece.id:sub(-1) == "2" and 2 or 1
  return board.homes[piece.owner][index]
end

function board.finish_position(piece)
  local index = piece.id:sub(-1) == "2" and 2 or 1
  return board.finish[piece.owner][index]
end

function board.route_index(owner, progress)
  local start = board.start[owner]
  local index = start + progress - 1
  while index > board.route_length do
    index = index - board.route_length
  end
  return index
end

function board.route_position(owner, progress)
  return board.route[board.route_index(owner, progress)]
end

function board.position(piece)
  if piece.status == "home" then
    return board.home_position(piece)
  end
  if piece.status == "finished" then
    return board.finish_position(piece)
  end
  return board.route_position(piece.owner, piece.progress)
end

return board