class Minesweeper::Playfield

# File lib/minesweeper/playfield.rb, line 7
def initialize(options = {})
  @display_set = options[:display_set]
  @mine_number = options[:mine_number]
  @rows = options[:rows]
  @cols = options[:cols]

  @revealed_squares = Set.new
  @mines = Set.new
  @playfield = Array.new(@rows) { Array.new(@cols) }

  until options[:mine_number].zero?
    mine_position = [rand(@rows), rand(@cols)]
    unless @mines.include?(mine_position)
      @mines << mine_position
      options[:mine_number] -= 1
    end
  end
end

# File lib/minesweeper/playfield.rb, line 67
def all_squares_revealed?
  @playfield.flatten.select(&:nil?).size == @mine_number
end

# File lib/minesweeper/playfield.rb, line 26
def display
  @playfield.each do |row|
    puts row.map { |content| Square.new(@display_set).display(content) }.join
  end
end

# File lib/minesweeper/playfield.rb, line 32
def display_with_mines
  @mines.each do |mine|
    y, x = mine
    @playfield[y][x] = true
  end
  display
end

# File lib/minesweeper/playfield.rb, line 44
def has_mine?(y, x)
  @mines.include?([y, x])
end

# File lib/minesweeper/playfield.rb, line 48
def mines_around(y, x)
  count = 0
  (-1).upto(1).each do |dx|
    (-1).upto(1).each do |dy|
      next if dx.zero? && dy.zero?
      next if x + dx < 0
      next if y + dy < 0
      next if x + dx >= @cols
      next if y + dy >= @rows

      if has_mine?(y + dy, x + dx)
        count += 1
      end
    end
  end

  count
end

# File lib/minesweeper/playfield.rb, line 71
def reveal_adjacent(y, x)
  (-1).upto(1).each do |dx|
    (-1).upto(1).each do |dy|
      next if dx.zero? && dy.zero?
      next if x + dx < 0
      next if y + dy < 0
      next if x + dx >= @cols
      next if y + dy >= @rows

      reveal_square(y + dy, x + dx)
    end
  end
end

# File lib/minesweeper/playfield.rb, line 85
def reveal_square(y, x)
  number_mines_around = mines_around(y, x)
  @playfield[y][x] = number_mines_around
  if number_mines_around.zero? && !@revealed_squares.include?([y, x])
    @revealed_squares << [y, x]
    reveal_adjacent(y, x)
  end
end

# File lib/minesweeper/playfield.rb, line 40
def within_boundaries?(y, x)
  y >= 0 && y < @rows && x >= 0 && x < @cols
end