module Slack::Web::Api::Endpoints::Im

def im_close(options = {})
  throw ArgumentError.new('Required arguments :channel missing') if options[:channel].nil?
  options = options.merge(channel: channels_id(options)['channel']['id']) if options[:channel]
  post('im.close', options)
end

def im_history(options = {})
  throw ArgumentError.new('Required arguments :channel missing') if options[:channel].nil?
  options = options.merge(channel: channels_id(options)['channel']['id']) if options[:channel]
  post('im.history', options)
end

def im_list(options = {})
  post('im.list', options)
end

def im_mark(options = {})
  throw ArgumentError.new('Required arguments :channel missing') if options[:channel].nil?
  throw ArgumentError.new('Required arguments :ts missing') if options[:ts].nil?
  options = options.merge(channel: channels_id(options)['channel']['id']) if options[:channel]
  post('im.mark', options)
end

def im_open(options = {})
  throw ArgumentError.new('Required arguments :user missing') if options[:user].nil?
  options = options.merge(user: users_id(options)['user']['id']) if options[:user]
  post('im.open', options)
end