local shell = {}

function shell:init(config)
	shell.triggers = {
	  "^/[Cc][Mm][Dd] (.+)$",
	  "^/[Uu][Pp][Tt][Ii][Mm][Ee]$",
	  "^/[Ss][Cc][Rr][Ee][Ee][Nn]$",
	  "^/[Cc][Hh][Ee][Cc][Kk]$",
	  "^/[Ww][Ee][Bb][Cc][Aa][Mm]$",
	  "^/[Tt][Rr][Aa][Ff][Ff][Ii][Cc]$"
	}
end

function shell:transeng(ger)
  local ger = string.gsub(ger, "Monday", "Montag")
  local ger = string.gsub(ger, "Tuesday", "Dienstag")
  local ger = string.gsub(ger, "Wednesday", "Mittwoch")
  local ger = string.gsub(ger, "Thursday", "Donnerstag")
  local ger = string.gsub(ger, "Friday", "Freitag")
  local ger = string.gsub(ger, "Saturday", "Samstag")
  local ger = string.gsub(ger, "Sunday", "Sonntag")
  
  local ger = string.gsub(ger, 'week,', 'Woche,')
  local ger = string.gsub(ger, 'weeks,', 'Wochen,')
  local ger = string.gsub(ger, 'day,', 'Tag,')
  local ger = string.gsub(ger, 'days,', 'Tage,')
  local ger = string.gsub(ger, 'hour,', 'Stunde und')
  local ger = string.gsub(ger, 'hours,', 'Stunden und')
  local ger = string.gsub(ger, 'minute$', 'Minute.')
  local ger = string.gsub(ger, 'minutes', 'Minuten.')
  return ger
end

local makeOurDate = function(dateString)
  local pattern = "(%d+)%-(%d+)%-(%d+)"
  local year, month, day = dateString:match(pattern)
  return day..'.'..month..'.'..year
end

function shell:action(msg, config, matches)
  if not is_sudo(msg, config) then
	utilities.send_reply(msg, config.errors.sudo, true)
	return
  end

  local input = matches[1]
  
  if msg.text:match('^/[Uu][Pp][Tt][Ii][Mm][Ee]$') then
    local cmd = run_command('uptime -s && uptime -p')
	local text1 = 'Der PC ist seit dem <b>'..makeOurDate(string.match(cmd, '(%d+-%d+-%d+)'))..'</b> an.'
	local text2 = shell:transeng('Das sind <b>'..string.match(cmd, 'up (.*)')..'</b>')
	utilities.send_reply(msg, text1..'\n'..text2, 'HTML')
    return
  end
  
  -- Requires scrot (sudo apt-get install scrot)
  if msg.text:match('^/[Ss][Cc][Rr][Ee][Ee][Nn]$') then
    local taken_time = os.date("%A, %d. %B %Y um %H:%M:%S Uhr")
    run_command("scrot 'scrot.png' -e 'mv $f /tmp/'")
	local text = '#Screenshot vom '..shell:transeng(taken_time)
	utilities.send_photo(msg.chat.id, '/tmp/scrot.png', text, msg.message_id)
	return
  end
  
  -- Requires fswebcam (sudo apt-get install fswebcam)
  if msg.text:match('^/[Ww][Ee][Bb][Cc][Aa][Mm]$') then
    run_command("fswebcam -r 640x480 --png 9 -D 1 /tmp/webcam.png")
	utilities.send_photo(msg.chat.id, '/tmp/webcam.png', nil, msg.message_id)
	return
  end
  
  if msg.text:match('^/[Cc][Hh][Ee][Cc][Kk]$') then
    local cmd = run_command("apt --just-print upgrade")
    local text = 'Es gibt <b>'..string.match(cmd, '(%d+) aktualisiert')..'</b> Updates'
	utilities.send_reply(msg, text, 'HTML')
    return
  end
  
  -- Requires vnstat & vnstati (sudo apt-get install vnstat vnstati)
  if msg.text:match('^/[Tt][Rr][Aa][Ff][Ff][Ii][Cc]$') then
    run_command("vnstati -m -vs -i enp2s0 -o /tmp/vnstat.png")
	utilities.send_photo(msg.chat.id, '/tmp/vnstat.png', nil, msg.message_id)
	return
  end
  
  input = input:gsub('—', '--')

  local output = run_command(input)
  if output:len() == 0 then
	output = 'Ausgeführt.'
  else
	output = '<pre>\n' .. output .. '\n</pre>'
  end
  output = output:gsub('<pre>%\n', '<pre>')
  output = output:gsub('%\n%\n</pre>', '</pre>')
  utilities.send_message(msg.chat.id, output, true, msg.message_id, 'HTML')
end

return shell