# frozen_string_literal: true

module Groundskeeper
  # Posts to the RADD #general channel.
  class Slack
    COMMAND = "curl"
    SLACK_WORKSPACE_KEY = "SLACK_WORKSPACE"
    SLACK_CHANNEL_KEY = "SLACK_CHANNEL"
    SLACK_TOKEN_KEY = "SLACK_TOKEN"
    URL = "https://hooks.slack.com/services/" \
          "%<workspace>s/%<channel>s/%<token>s"
    SEND_MESSAGE = "-X POST -H 'Content-type: application/json' " \
                   "--data '{\"text\":\"%<message>s\"}' #{URL}".freeze

    attr_reader :slack

    def self.build
      new Executable.new(COMMAND)
    end

    def initialize(slack)
      @slack = slack
    end

    def send_message(message)
      slack.execute(format(SEND_MESSAGE,
                           message: message,
                           workspace: ENV.fetch(SLACK_WORKSPACE_KEY, nil),
                           channel: ENV.fetch(SLACK_CHANNEL_KEY, nil),
                           token: ENV.fetch(SLACK_TOKEN_KEY, nil)))
    end

    def credentials?
      !ENV.fetch(SLACK_WORKSPACE_KEY, "").empty? &&
        !ENV.fetch(SLACK_CHANNEL_KEY, "").empty? &&
        !ENV.fetch(SLACK_TOKEN_KEY, "").empty?
    end
  end
end