class Reviewlette

# File lib/reviewlette.rb, line 6
def initialize(members:, github_config: nil, trello_config: nil)
  @trello  = TrelloConnection.new(trello_config)
  @github  = github_config || YAML.load_file("#{File.dirname(__FILE__)}/../config/github.yml")
  @members = members
end

# File lib/reviewlette.rb, line 19
def check_repo(repo_name, token)
  repo = GithubConnection.new(repo_name, token)

  unless repo.repo_exists?
    puts "Repository #{repo_name} does not exist. Check your configuration"
    return
  end

  repo.pull_requests.each do |issue|
    issue_id = issue[:number]
    issue_title = issue[:title]
    issue_labels = repo.labels(issue_id)

    puts "*** Checking GitHub pull request: #{issue_title}"
    matched = issue_title.match(/\d+[_'"]?$/)

    unless matched
      puts 'Pull request not assigned to a trello card'
      next
    end

    card_id = matched[0].to_i
    card    = @trello.find_card_by_id(card_id)

    unless card
      puts "No matching card found (id #{card_id})"
      next
    end

    puts "Found matching trello card: #{card.name}"

    assignees = issue[:assignees].map(&:login)
    already_assigned_members = @members.select { |m| assignees.include? m.github_handle }
    wanted_number = how_many_should_review(issue_labels)

    if assignees.size < wanted_number
      reviewers = select_reviewers(card, wanted_number, already_assigned_members)
      if reviewers.empty?
        puts "Could not find a reviewer for card: #{card.name}"
        next
      end
      repo.add_assignees(issue_id, reviewers.map { |r| r.github_handle } )
      repo.comment_reviewers(issue_id, reviewers, card)
      @trello.comment_reviewers(card, repo_name, issue_id, reviewers)
      @trello.move_card_to_list(card, 'In review')
      already_assigned_members
    end


  end
end

# File lib/reviewlette.rb, line 79
def how_many_should_review(labels)
  return 2 if labels.include? '2 reviewers'
  1
end

# File lib/reviewlette.rb, line 12
def run
  @github['repos'].each do |repo|
    puts "Checking repository #{repo}..."
    check_repo(repo, @github['token'])
  end
end

# File lib/reviewlette.rb, line 71
def select_reviewers(card, number = 1, already_assigned = [])
  reviewers = @members
  reviewers.reject! { |r| card.members.map(&:username).include? r.trello_handle }
  reviewers -= already_assigned

  reviewers.sample(number - already_assigned.size) + already_assigned
end