assignment_three.rb

# Input service to return array of array [ ["Team A", "Team B", "win"] ]
class DummyData
  def initialize
    @data = <<~INPUT
    Team B;Team C;win
    Team A;Team D;draw
    Team A;Team B;win
    Team D;Team C;loss
    Team C;Team A;loss
    Team B;Team D;win
    INPUT
  end

  def call
    @data.split("\n").map { |line| line.split(";") }
  end
end


class Team
  POINTS_TABLE = { win: 3, draw: 1, loss: 0 }

  attr_accessor :name, :points, :win_count, :draw_count, :loss_count, :match_played

  def initialize(name)
    @name         = name
    @points       = 0
    @win_count    = 0
    @loss_count   = 0
    @draw_count   = 0
    @match_played = 0
  end

  def win!
    @win_count    += 1
    @match_played += 1
    @points += POINTS_TABLE[:win]
  end

  def loss!
    @loss_count   += 1
    @match_played += 1
    @points += POINTS_TABLE[:loss]
  end

  def draw!
    @draw_count   += 1
    @match_played += 1
    @points += POINTS_TABLE[:draw]
  end
end


class Match
  attr_accessor :home_team, :visiting_team, :outcome

  OUTCOME = { win: 'win', loss: 'loss', draw: 'draw' }.freeze

  def initialize(home_team, visiting_team, outcome)
    @outcome       = outcome
    @home_team     = home_team
    @visiting_team = visiting_team
  end

  def call
    case outcome
    when OUTCOME[:win]
      @home_team.win!
      @visiting_team.loss!
    when OUTCOME[:loss]
      @home_team.loss!
      @visiting_team.win!
    when OUTCOME[:draw]
      @home_team.draw!
      @visiting_team.draw!
    end
  end
end


class ScoreCard
  TEAM_NAMES = ['Team A', 'Team B', 'Team C', 'Team D']

  attr_accessor :matches, :input, :teams_map, :teams

  def initialize(input_service = DummyData.new)
    @matches = []
    @input   = input_service.call
    @teams_map = TEAM_NAMES.inject({}) do |acc, team_name|
      acc[team_name] = Team.new(team_name)
      acc
    end
    @teams = @teams_map.values
  end

  def calculate
    self.matches = input.map do |match|
      home_team, visiting_team, outcome = match
      Match.new(teams_map[home_team], teams_map[visiting_team], outcome)
    end

    matches.each(&:call)
    teams.sort_by! { |team| [team.points * -1, team.name] }
  end

  def print_score_card
    puts "Score Board"
    puts "-----------------------------------"
    puts "Team name | MP | W | D | L | Points"
    puts "-----------------------------------"
    @teams.each do |team|
      puts "#{team.name} | #{team.match_played} | #{team.win_count} | #{team.draw_count} | #{team.loss_count} | #{team.points}"
    end
    puts "-----------------------------------"
  end

  def call
    calculate && print_score_card
  end

end





ScoreCard.new.call


# Score Board
# -----------------------------------
# Team name | MP | W | D | L | Points
# -----------------------------------
# Team A | 3 | 2 | 1 | 0 | 7
# Team B | 3 | 2 | 0 | 1 | 6
# Team C | 3 | 1 | 0 | 2 | 3
# Team D | 3 | 0 | 1 | 2 | 1
# -----------------------------------