module Codebreaker
  include Validation

  class Game
    PLUS = '+'.freeze
    MINUS = '-'.freeze

    attr_reader :name, :difficult, :secret, :attempts, :hints, :hints_used, :attempts_used

    def initialize(name, difficult)
      @name = name
      @difficult = difficult
      @attempts = get_attempts(difficult)
      @hints = get_hints(difficult)
      @attempts_used = 0
      @hints_used = 0

      generate_secret
      @secret_chars = @secret.chars.shuffle
    end

    def decrement_attempts
      return false if @attempts.zero?

      @attempts_used += 1
      @attempts -= 1
    end

    def use_hint
      return false if @hints.zero?

      @hints_used += 1
      @hints -= 1
      @secret_chars.pop
    end

    def win?(matches)
      matches == '++++'
    end

    def check_number(guess, secret_code = @secret)
      secret = secret_code.chars
      input = guess.chars

      grouped = secret.zip(input).group_by { |values| values.first == values.last }
      grouped.default = []

      plus = grouped[true].size
      return PLUS * plus if plus == 4

      secret, input = grouped[false].transpose
      minus = (secret & input).inject(0) { |count, number| count + [secret.count(number), input.count(number)].min }
      PLUS * plus << MINUS * minus
    end

    private

    def generate_secret
      @secret = (1..4).map { rand(1..6) }.join
    end

    def get_attempts(difficult)
      case difficult
      when 'easy' then 15
      when 'medium' then 10
      when 'hell' then 5
      end
    end

    def get_hints(difficult)
      case difficult
      when 'easy' then 2
      else 1
      end
    end
  end
end