class Board

# File lib/boardsy/lib/board.rb, line 6
def initialize(rows, cols = rows, value: nil)
  @grid = Array.new(cols) do |n|
    Array.new(rows) do |m|
      x = m.next; y = cols - n
      value = yield(x,y,value) if block_given?
      Square.new(value, x, y)
    end
  end
end

# File lib/boardsy/lib/board.rb, line 148
def [](idx)
  grid[idx]
end

# File lib/boardsy/lib/board.rb, line 35
def col(*coords)
  grid.transpose[format_coords(coords).first - 1].reverse
end

# File lib/boardsy/lib/board.rb, line 46
def diagonals(coords)
  coords = format_coords(coords)
  diagonals = []
  length = (1..grid.size); width = (1..grid[0].size)
  [[1,1],[-1,1]].each do |m,n|
    diagonal = []
    x = coords.first; y = coords.last
    while width.include?(x) && length.include?(y)
      x -= m; y -= n
    end
    x += m; y += n
    while width.include?(x) && length.include?(y)
      diagonal << square(x,y)
      x += m; y += n
    end
    diagonals << diagonal unless diagonal.size == 1
  end
  diagonals
end

# File lib/boardsy/lib/board.rb, line 132
def each
  if block_given?
    grid.reverse_each { |row| row.each { |square| yield(square) } }
  else
    Enumerator.new do |y|
      grid.reverse_each { |row| row.each { |square| y << square } }
    end
  end
end

# File lib/boardsy/lib/board.rb, line 114
def flip(axis = :x)
  raise ArgumentError unless [:x, :y].include?(axis.to_sym)
  flip!(axis)
  board = Board.new(grid.first.size, grid.size) { |x,y| square(x,y).value }
  flip!(axis)
  board
end

# File lib/boardsy/lib/board.rb, line 87
def flip!(axis = :x)
  raise ArgumentError unless [:x, :y].include?(axis.to_sym)
  send("flip_#{axis}!")
end

# File lib/boardsy/lib/board.rb, line 122
def flip_x
  flip(:x)
end

# File lib/boardsy/lib/board.rb, line 92
def flip_x!
  (0...grid.first.size).each do |m|
    (0...grid.size / 2).each do |n|
      sq1 = grid[n][m]
      sq2 = grid[(grid.size - 1) - n][m]
      sq1.value, sq2.value = sq2.value, sq1.value
    end
  end
  self
end

# File lib/boardsy/lib/board.rb, line 126
def flip_y
  flip(:y)
end

# File lib/boardsy/lib/board.rb, line 103
def flip_y!
  (0...grid.first.size / 2).each do |m|
    (0...grid.size).each do |n|
      sq1 = grid[n][m]
      sq2 = grid[n][(grid.first.size - 1) - m]
      sq1.value, sq2.value = sq2.value, sq1.value
    end
  end
  self
end

# File lib/boardsy/lib/board.rb, line 152
def index(coords)
  x,y = format_coords(coords)
  [grid.size - y, x - 1]
end

# File lib/boardsy/lib/board.rb, line 16
def length
  grid.first.size
end

# File lib/boardsy/lib/board.rb, line 41
def row(*coords)
  grid[grid.size - (format_coords(coords).last)]
end

# File lib/boardsy/lib/board.rb, line 71
def same_col?(*squares)
  squares.map! { |sq| format_coords(sq) }
  squares.all? { |x,_| x == squares.first[0] }
end

# File lib/boardsy/lib/board.rb, line 78
def same_diagonal?(*squares)
  squares.map! { |sq| square(sq) }
  diagonals(squares.first).any? do |diagonal|
    squares.all? { |square| diagonal.include?(square) }
  end
end

# File lib/boardsy/lib/board.rb, line 66
def same_row?(*squares)
  squares.map! { |sq| format_coords(sq) }
  squares.all? { |_,y| y == squares.first[1] }
end

# File lib/boardsy/lib/board.rb, line 29
def square(*coords)
  coords = format_coords(coords)
  each { |square| return square if square.coords == coords }
  raise ArgumentError, 'Coordinates passed are out of bounds.'
end

# File lib/boardsy/lib/board.rb, line 24
def squares
  each.to_a
end

# File lib/boardsy/lib/board.rb, line 142
def to_s
  grid.map do |row|
    row.map { |square| square.value }.join(' ')
  end.join("\n")
end

# File lib/boardsy/lib/board.rb, line 20
def width
  grid.size
end

# File lib/boardsy/lib/board.rb, line 161
def format_coords(coords)
  format_coords_into_array(coords).map do |c|
    raise ArgumentError unless c.to_s =~ /[0-9a-zA-Z]/
    ord = c.ord
    if c.is_a? Integer
      c
    else
      c =~ /[a-zA-Z]/ ? c =~ /[a-z]/ ? ord - 96 : ord - 64 : c.to_i
    end
  end
end

# File lib/boardsy/lib/board.rb, line 173
def format_coords_into_array(coords)
  coords = coords.first if coords.is_a?(Array) && coords.size == 1
  coords = coords.coords if coords.is_a?(Square)
  coords = coords.chars if coords.is_a?(String)
  unless coords.size == 2
    raise ArgumentError, "Expected an 'x' and a 'y' coordinate."
  end
  coords
end