-- fct to split a string by a delimeter
local function split(s, delimiter)
  local result = {}
  for match in (s..delimiter):gmatch("(.-)"..delimiter) do
    table.insert(result, match)
  end
  return result
end

-- convert hex to char
local hex_to_char = function(x)
  return string.char(tonumber(x, 16))
end

-- unespace special chars in URL
local unescape = function(url)
  return url:gsub("%%(%x%x)", hex_to_char)
end

return function(request, next_middleware)
  local response = next_middleware()
  local hookURL = "meurl"

  if(request.uri == '/hook') then
    local params = split(request.body,'&')
    local decoded_params = {}

    -- turn urlencoded string into an object
    for i=1,#params do
      local p = split(params[i],'=')
      decoded_params[p[1]] = p[2]
    end
    msg = 'Hey '..decoded_params.user_name..' I heard you like cats '..'\xF0\x9F\x98\xB8'
    local r = http.json.post(hookURL,'{"text": "'..msg..'","channel":"#'.. decoded_params.channel_name..'","icon_emoji":":cat:"}')
    console.log(r.status, r.body)
  end
  return response
end