board.rb

class Board
	attr_reader :grid

	def initialize(grid = nil)
		@grid = grid || self.class.default_grid
	end

	def self.default_grid
		Array.new(10) { Array.new(10) }
	end

	def count
		@grid.inject(0) { |sum, row| sum += row.count(:s) }
	end

	def empty?(*pos)
		if pos.empty?
			@grid.flatten.all? { |el| el.nil? }
		else
			x, y = pos.flatten
			@grid[y][x].nil?
		end
	end

	def display
		col_idx = "   |"
		@grid.each_index { |i| col_idx += " #{i} |" }

		col_idx += "\n" + "-" * 44 + "\n"

		board_without_col_idx = ""
		@grid.each_with_index do |row, i|
			board_without_col_idx += " #{i} |"

			row.each { |el| board_without_col_idx += " #{el || ' '} |" }
			board_without_col_idx += "\n"

			board_without_col_idx += "-" * 44 + "\n"
		end

		puts col_idx + board_without_col_idx
	end

	def full?
		@grid.flatten.all? { |el| !el.nil? }
	end

	def place_random_ship
		raise "Board is full" if self.full?

		taken_pos = []
		x = rand(0...@grid.size)
		y = rand(0...@grid.size)

		if !taken_pos.include?([x, y])
			@grid[y][x] = :s
			taken_pos << [x, y]
		end
	end

	def won?
		empty?
	end

end