module GemsuranceSlack

# File lib/gemsurance_slack.rb, line 10
def self.check_and_notify
  abort "Error: environment variables SLACK_WEBHOOK_URL or SLACK_CHANNEL empty." unless initialize_slack_notifier

  @gems_infos = Gemsurance::Runner.new.run.gem_infos

  vulnerables_notification
  outdated_notification
end

# File lib/gemsurance_slack.rb, line 65
def self.gems_count_string(count)
  count == 1 ? "1 gem is" : "#{count} gems are"
end

# File lib/gemsurance_slack.rb, line 21
def self.initialize_slack_notifier
  webhook_url = ENV["SLACK_WEBHOOK_URL"]
  channel = ENV["SLACK_CHANNEL"]
  return false unless webhook_url && channel

  @notifier = Slack::Notifier.new webhook_url, :channel => channel
end

# File lib/gemsurance_slack.rb, line 47
def self.outdated_notification
  outdated = @gems_infos.select(&:outdated?)
  return if outdated.empty?

  @notifier.ping "", :icon_emoji => ":warning:", :username => "Gemsurance Warning", :attachments => [{
    :fallback => "#{project_name}, #{gems_count_string(outdated.count)} out of date.",
    :pretext => "#{project_name}, #{gems_count_string(outdated.count)} out of date.",
    :color => "warning",
    :fields => [{
      :title => outdated.map(&:name).join(", ")
    }]
  }]
end

# File lib/gemsurance_slack.rb, line 61
def self.project_name
  ENV["SLACK_APP_NAME"] || ""
end

# File lib/gemsurance_slack.rb, line 29
def self.vulnerables_notification
  vulnerables = @gems_infos.select(&:vulnerable?)
  return if vulnerables.empty?

  @notifier.ping "", :icon_emoji => ":rotating_light:", :username => "Gemsurance Alert", :attachments => [{
    :fallback => "#{project_name}, #{gems_count_string(vulnerables.count)} vulnerable.",
    :pretext => "#{project_name}, #{gems_count_string(vulnerables.count)} vulnerable.",
    :color => "danger",
    :fields => vulnerables.map do |gm|
      {
        :title => gm.name,
        :value => "Update v#{gm.current_version} to v#{gm.newest_version} (#{gm.vulnerabilities.map(&:title).join(", ")})",
        :short => false
      }
    end
  }]
end