module Metafrazo

# File lib/metafrazo.rb, line 35
def self.config
  @config ||= Config.new
end

# File lib/metafrazo.rb, line 39
def self.configure
  yield(config)
end

# File lib/metafrazo.rb, line 14
def self.run(payload)
  token = config.token
  repo = subject_repo(payload)

  git = Git.new(token, payload, repo)
  diff = GitDiffGenerator.new(git).generate
  changes = local_changes(diff, diff_paths(repo))

  unless changes.empty?
    if slack_enabled?
      m = message(changes, git.pull_request_url, git.issue_id)
      Slack.send_message(m, config.slack_webhook_url)
    else
      git.comment(message(changes))
    end
    # git.add_label("bug")
  end

  !changes.empty?
end

# File lib/metafrazo.rb, line 58
def self.diff_paths(repo)
  paths = config.paths || []
  paths = [config.path] if config.path
  paths = [repo[:path]] if repo && repo[:path]
  paths = repo[:paths] if repo && repo[:paths]
  paths
end

# File lib/metafrazo.rb, line 45
def self.local_changes(diffs, paths)
  changes = []
  paths.each do |path|
    diffs.each do |diff|
      if diff.match(/^#{path}/)
        changes << diff
      end
    end
  end

  return changes
end

# File lib/metafrazo.rb, line 80
def self.message(changes, url = nil, number = nil)
  messages = [
    "ci sono nuove stringhe que sono in disperato bisogno di traduzione",
    "hay nuevas cadenas que están en desesperada necesidad de una traducción",
    "Que há novas cordas estão em necessidade desesperada de tradução",
    "il y a des nouvelles chaînes Que sont dans le besoin désespéré de la traduction",
    "gibt es neue Saiten que sind in einer verzweifelten Notwendigkeit Übersetzung"
  ]

  message = "#{config.usernames.join(' ')}: #{messages.sample} – "
  message += changes.map { |change| "`#{change}`" }.join(' ')
  message += " \n\n<#{url}| ##{number} - 👉> \n" if url&& number
end

# File lib/metafrazo.rb, line 96
def self.slack_enabled?
  config.slack_webhook_url.present?
end

# File lib/metafrazo.rb, line 66
def self.subject_repo(payload)
  return nil unless config.repos

  name = payload["pull_request"]["head"]["repo"]["full_name"].downcase
  parts = name.split('/')

  names = config.repos.keys.select do |key|
    key = key.downcase
    key == name || (parts.count > 1 && parts[1] == key)
  end

  config.repos[names.first]
end