class Board

# File lib/command_four/board.rb, line 50
def self.from_a(arr, connect_n = 4)
  board = Board.new(arr.length, arr[0].length, connect_n)
  for i in 0...arr[0].length
    for j in 0...arr.length
      if arr[j][i] != :empty
        board.drop_piece(j, arr[j][i])
      end
    end
  end
  board
end

# File lib/command_four/board.rb, line 4
def initialize(width = 7, height = 6, connect_n = 4)
  @width = width
  @height = height
  @connect_n = connect_n
  @state = GameState.new(false, [])
  @board = Array.new(@width) {Array.new(@height, :empty)}
  @completed_moves = 0
  @max_moves = width * height
end

# File lib/command_four/board.rb, line 14
def drop_piece(column, color)
  if game_over?()
    raise PieceDropError.new("Game is already over")
  elsif invalid_index?(column)
    raise PieceDropError.new("Invalid column index: #{column}")
  elsif full?(column)
    raise PieceDropError.new("Column #{column} is already full")
  else
    first_empty_cell_index = @board[column].index {|cell| cell == :empty}
    @board[column][first_empty_cell_index] = color
    @completed_moves += 1
    @state = ConnectNChecker.new(@board, @connect_n, column, first_empty_cell_index).check
    if @completed_moves >= @max_moves && !game_over?()
      @state = GameState.new(true, [])
    end
  end
end

# File lib/command_four/board.rb, line 32
def game_over?
  @state.game_over?
end

# File lib/command_four/board.rb, line 62
def to_a
  @board
end

# File lib/command_four/board.rb, line 36
def winning_cells
  @state.winning_cells
end

# File lib/command_four/board.rb, line 40
def winning_color
  if @state.winning_cells.length > 0
    col_idx = @state.winning_cells[0][0]
    row_idx = @state.winning_cells[0][1]
    @board[col_idx][row_idx]
  else
    nil
  end
end

# File lib/command_four/board.rb, line 75
def full?(column)
  @board[column][-1] != :empty
end

# File lib/command_four/board.rb, line 71
def invalid_index?(column)
  column < 0 || column >= @width
end