module RaiseToSlack

# File lib/raise_to_slack.rb, line 54
def self.channel_name
  ENV['RAISE_TO_SLACK_CHANNEL_NAME']
end

# File lib/raise_to_slack.rb, line 58
def self.debug?
  ENV['RAISE_TO_SLACK_DEBUG']
end

# File lib/raise_to_slack.rb, line 50
def self.oauth2_token
  ENV['RAISE_TO_SLACK_OAUTH2_TOKEN']
end

# File lib/raise_to_slack.rb, line 24
def self.post(e)
  url = URI.parse('https://slack.com/api/files.upload')
  req = Net::HTTP::Post.new(url.path)
  req.set_form([
    ["content", e.backtrace.join("\n")],
    ["filename", e.class.to_s],
    ["channels", channel_name],
    ["token", oauth2_token],
  ], 'multipart/form-data')
  http = Net::HTTP.new(url.host, url.port)
  http.use_ssl = true
  res = http.start {|http| http.request(req) }
  STDERR.puts 'upload response' if debug?
  STDERR.puts res.body if debug?

  thread_ts = JSON.parse(res.body)['file']['shares'].values[0].values[0][0]['ts']
  channel_id = JSON.parse(res.body)['file']['shares'].values[0].keys[0]
  res = Net::HTTP.post_form(
    URI.parse('https://slack.com/api/chat.postMessage'),
    { 'token' => oauth2_token, 'channel' => channel_id, 'text' => e.message, 'reply_broadcast' => 'true', 'thread_ts' => thread_ts }
  )
  STDERR.puts 'post response' if debug?
  STDERR.puts res.body if debug?
  res.value
end

# File lib/raise_to_slack.rb, line 7
def self.run
  begin
    yield
  rescue => e
    if channel_name.nil? || oauth2_token.nil?
      STDERR.puts "RaiseToSlack does not work. Please set ENV['RAISE_TO_SLACK_OAUTH2_TOKEN'] and ENV['RAISE_TO_SLACK_CHANNEL_NAME']."
    else
      begin
        post(e)
      rescue => e2
        STDERR.puts "RaiseToSlack failed: #{e2.message}"
      end
    end
    raise e
  end
end