gistfile1.txt

module Minesweeper
  class Board
    DIFFICULTIES = {easy: 25, medium: 50, hard: 75}

    attr_reader :panel

    def initialize(width:, height:, difficulty:)
      @width = width
      @height = height
      @difficulty = DIFFICULTIES[difficulty]
      populate
    end

    def to_s
      output = ""
      @panel.each do |row|
        row.each do |tile|
          output << tile.to_s
        end
        output << "\n"
      end
      output
    end

    private

    def populate
      @panel = Array.new(@height) do |y|
        Array.new(@width) do |x|
          Tile.new(x: x, y: y)
        end
      end
      mine_panel!
      calculate_neighbours!
    end

    def area
      @width * @height
    end

    def number_of_mines
      ((area.to_f / 100.0) * @difficulty).to_i
    end
    
       def mine_panel!
      count = number_of_mines
      while count != 0
        x, y = rand(@width), rand(@height)
        tile = @panel[y][x]
        unless tile.mine
          tile.mine = true
          count -= 1
        end
      end
    end

    def calculate_neighbours!
      @panel.map.with_index do |row, i|
        row.map.with_index do |tile, z|
          next if tile.mine
          tile.neighbours = calculate_neighbours(y: i, x: z)
        end
      end
    end

    def calculate_neighbours(y:, x:)
      count = 0
      [-1, 0, 1].product([-1, 0, 1]).each do |k, j|
        if @panel[y + k] && @panel[y + k][x + j]
          tile = @panel[y + k][x + j]
          count += 1 if tile.mine == true
        end
      end
      count
    end
  end
end

module Minesweeper
  class Tile
    attr_reader :x, :y
    attr_accessor :mine, :neighbours

    def initialize(x:, y:)
      @x = x
      @y = y
      @mine = false
      @neighbours = 0
    end

    def to_s
      if @mine
        "*"
      else
        @neighbours.to_s
      end
    end
  end
end