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defmodule Board do
alias IslandsEngine.{Coordinate, Island}
def position_island(board, key, %Island{} = island) do
case overlaps_existing_island?(board, key, island) do
true -> {:error, :overlapping_island}
false -> Map.put(board, key, island)
end
end
def all_islands_positioned?(board) do
Enum.all?(Island.types, &(Map.has_key?(board, &1)))
end
def guess(board, %Coordinate{} = coordinate) do
board
|> check_all_islands(coordinate)
|> guess_response(board)
end
defp overlaps_existing_island?(board, new_key, new_island) do
Enum.any?(board, fn {key, island} ->
key != new_key and Island.overlaps?(island, new_island)
end)
end
defp check_all_islands(board, coordinate) do
Enum.find_value(board, :miss, fn {key, island} ->
case Island.guess(island, coordinate) do
{:hit, island} -> {key, island}
:miss -> false
end
end)
end
defp guess_response({key, island}, board) do
board = %{board | key => island}
{:hit, forest_check(board, key), win_check(board), board}
end
defp guess_response(:miss, board), do: {:miss, :none, :no_win, board}
defp forest_check(board, key) do
case forested?(board, key) do
true -> key
false -> :none
end
end
defp forested?(board, key) do
board
|> Map.fetch!(key)
|> Island.forested?()
end
defp win_check(board) do
case all_forested?(board) do
true -> :win
false -> :no_win
end
end
defp all_forested?(board) do
Enum.all?(board, fn {_key, island} -> Island.forested?(island) end)
end
end
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