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|
defmodule Chessh.SSH.Client.Board do
alias Chessh.SSH.Client
alias IO.ANSI
defmodule State do
defstruct cursor: %{x: 0, y: 0},
highlighted: %{},
move_from: nil
end
use Chessh.SSH.Client.Screen
@chess_board_height 8
@chess_board_width 8
@tile_width 7
@tile_height 4
@dark_piece_color ANSI.magenta()
@light_piece_color ANSI.red()
def tileIsLight(row, col) do
rem(row, 2) == rem(col, 2)
end
def piece_type(char) do
case String.capitalize(char) do
"P" -> "pawn"
"N" -> "knight"
"R" -> "rook"
"B" -> "bishop"
"K" -> "king"
"Q" -> "queen"
_ -> nil
end
end
def make_board({tile_width, tile_height}) do
rows =
Enum.map(0..(@chess_board_height - 1), fn row ->
Enum.map(0..(@chess_board_width - 1), fn col ->
if(tileIsLight(row, col), do: ' ', else: '▊')
|> List.duplicate(tile_width)
end)
|> Enum.join("")
end)
Enum.flat_map(rows, fn row -> Enum.map(1..tile_height, fn _ -> row end) end)
end
defp skip_cols_or_place_piece_reduce(char, {curr_column, data}, rowI) do
case Integer.parse(char) do
{skip, ""} ->
{curr_column + skip, data}
_ ->
case piece_type(char) do
nil ->
{curr_column, data}
type ->
shade = if(char != String.capitalize(char), do: "dark", else: "light")
{curr_column + 1,
Map.put(
data,
"#{rowI}, #{curr_column}",
{shade, type}
)}
end
end
end
defp make_coordinate_to_piece_art_map(fen) do
rows =
String.split(fen, " ")
|> List.first()
|> String.split("/")
Enum.zip(rows, 0..(length(rows) - 1))
|> Enum.map(fn {row, rowI} ->
{@chess_board_height, pieces_per_row} =
Enum.reduce(
String.split(row, ""),
{0, %{}},
&skip_cols_or_place_piece_reduce(&1, &2, rowI)
)
pieces_per_row
end)
|> Enum.reduce(%{}, fn pieces_map_for_this_row, acc ->
Map.merge(acc, pieces_map_for_this_row)
end)
end
def draw_board(
fen,
{tile_width, tile_height} = tile_dims,
highlights
) do
coordinate_to_piece = make_coordinate_to_piece_art_map(fen)
board = make_board(tile_dims)
Enum.zip_with([board, 0..(length(board) - 1)], fn [rowStr, row] ->
curr_y = div(row, tile_height)
%{row_chars: row_chars} =
Enum.reduce(
Enum.zip(String.graphemes(rowStr), 0..(String.length(rowStr) - 1)),
%{current_color: ANSI.black(), row_chars: []},
fn {char, col}, %{current_color: current_color, row_chars: row_chars} = row_state ->
curr_x = div(col, tile_width)
key = "#{curr_y}, #{curr_x}"
relative_to_tile_col = col - curr_x * tile_width
prefix =
if relative_to_tile_col == 0 do
case Map.fetch(highlights, {curr_y, curr_x}) do
{:ok, color} ->
color
_ ->
ANSI.default_background()
end
end
case Map.fetch(coordinate_to_piece, key) do
{:ok, {shade, type}} ->
piece = @ascii_chars["pieces"][shade][type]
piece_line = Enum.at(piece, row - curr_y * tile_height)
piece_line_len = String.length(piece_line)
pad_left_right = div(tile_width - piece_line_len, 2)
if relative_to_tile_col >= pad_left_right &&
relative_to_tile_col < tile_width - pad_left_right do
piece_char = String.at(piece_line, relative_to_tile_col - pad_left_right)
new_char = if piece_char == " ", do: char, else: piece_char
color =
if piece_char == " ",
do: ANSI.default_color(),
else: if(shade == "dark", do: @dark_piece_color, else: @light_piece_color)
if color != current_color do
%{
row_state
| current_color: color,
row_chars: row_chars ++ [prefix, color, new_char]
}
else
%{
row_state
| current_color: current_color,
row_chars: row_chars ++ [prefix, new_char]
}
end
else
%{
row_state
| current_color: ANSI.default_color(),
row_chars: row_chars ++ [prefix, ANSI.default_color(), char]
}
end
_ ->
if ANSI.white() != current_color do
%{
row_state
| current_color: ANSI.default_color(),
row_chars: row_chars ++ [prefix, ANSI.default_color(), char]
}
else
%{
row_state
| row_chars: row_chars ++ [prefix, char]
}
end
end
end
)
row_chars
|> Enum.join("")
end)
end
def render(%Client.State{
state_stack: [{_this_module, %State{highlighted: highlighted}} | _]
}) do
board =
draw_board(
"rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1",
{@tile_width, @tile_height},
highlighted
)
[ANSI.home()] ++
Enum.map(
Enum.zip(1..length(board), board),
fn {i, line} ->
[ANSI.cursor(i, 0), line]
end
)
end
def handle_input(
action,
%Client.State{
state_stack: [
{this_module,
%State{
move_from: move_from,
cursor: %{x: cursor_x, y: cursor_y} = cursor
} = screen_state}
| rest_stack
]
} = state
) do
new_cursor =
case action do
:left -> %{y: cursor_y, x: cursor_x - 1}
:right -> %{y: cursor_y, x: cursor_x + 1}
:down -> %{y: cursor_y + 1, x: cursor_x}
:up -> %{y: cursor_y - 1, x: cursor_x}
_ -> cursor
end
{new_move_from, _move_to} =
if action == :return do
coords = {new_cursor.y, new_cursor.x}
case move_from do
nil -> {coords, nil}
_ -> {nil, coords}
end
else
{move_from, nil}
end
%Client.State{
state
| state_stack: [
{this_module,
%State{
screen_state
| cursor: new_cursor,
move_from: new_move_from,
highlighted: %{
new_move_from => ANSI.green_background(),
{new_cursor.y, new_cursor.x} => ANSI.green_background()
}
}}
| rest_stack
]
}
end
end
|
