-- original plugin by Akamaru [https://ponywave.de]
-- I added Redis and automatic online switching back in 2015

local afk = {}

function afk:init(config)
	afk.triggers = {
	  "^/([Aa][Ff][Kk])$",
      "^/([Aa][Ff][Kk]) (.*)$"
	}
	afk.doc = [[*
]]..config.cmd_pat..[[afk* _[Text]_: Setzt Status auf AFK mit optionalem Text]]
end

afk.command = 'afk [Text]'

function afk:is_offline(hash)
  local afk = redis:hget(hash, 'afk')
  if afk == "true" then
    return true
  else
    return false
  end
end

function afk:get_afk_text(hash)
  local afk_text = redis:hget(hash, 'afk_text')
  if afk_text ~= nil and afk_text ~= "" and afk_text ~= "false" then
    return afk_text
  else
    return false
  end
end

function afk:switch_afk(user_name, user_id, chat_id, timestamp, text)
  local hash =  'afk:'..chat_id..':'..user_id
  
  if afk:is_offline(hash) then
    local afk_text = afk:get_afk_text(hash)
    if afk_text then
      return 'Du bist bereits AFK! ('..afk_text..')'
	else
	  return 'Du bist bereits AFK!'
	end
  end
  
  print('Setting redis hash afk in '..hash..' to true')
  redis:hset(hash, 'afk', true)
  print('Setting redis hash timestamp in '..hash..' to '..timestamp)
  redis:hset(hash, 'time', timestamp)
  
  if text then
    print('Setting redis hash afk_text in '..hash..' to '..text)
    redis:hset(hash, 'afk_text', text)
    return user_name..' ist AFK! ('..text..')'
  else
    return user_name..' ist AFK!'
  end
end

function afk:pre_process(msg, self)
  if msg.chat.type == "private" then
	-- Ignore
    return
  end

  local user_name = get_name(msg)
  local user_id = msg.from.id
  local chat_id = msg.chat.id
  local hash =  'afk:'..chat_id..':'..user_id
  
  
  if afk:is_offline(hash) then
    local afk_text = afk:get_afk_text(hash)
	
	-- calculate afk time
	local timestamp = redis:hget(hash, 'time')
	local current_timestamp = msg.date
	local afk_time = current_timestamp - timestamp
    local duration = makeHumanTime(afk_time)
   
	redis:hset(hash, 'afk', false)
    if afk_text then
	  redis:hset(hash, 'afk_text', false)
	  local afk_text = afk_text:gsub("%*","")
	  local afk_text = afk_text:gsub("_","")
	  utilities.send_message(self, msg.chat.id, user_name..' ist wieder da! (war: *'..afk_text..'* für '..duration..')', true, nil, true)
	else
	  utilities.send_message(self, msg.chat.id, user_name..' ist wieder da! (war '..duration..' weg)')
	end
  end
  
  return msg
end

function afk:action(msg)
  if msg.chat.type == "private" then
    utilities.send_reply(self, msg, "Mir ist's egal, ob du AFK bist.")
    return
  end
  
  local user_id = msg.from.id
  local chat_id = msg.chat.id
  local user_name = get_name(msg)
  local timestamp = msg.date
  
  utilities.send_reply(self, msg, afk:switch_afk(user_name, user_id, chat_id, timestamp, matches[2]))
end

return afk