--[[
  Get counts per child states

    Input:
      KEYS[1]    processed key
      KEYS[2]    unprocessed key
      KEYS[3]    ignored key
      KEYS[4]    failed key

      ARGV[1...] types
]]
local rcall = redis.call;
local processedKey = KEYS[1]
local unprocessedKey = KEYS[2]
local ignoredKey = KEYS[3]
local failedKey = KEYS[4]
local results = {}

for i = 1, #ARGV do
  if ARGV[i] == "processed" then
    results[#results+1] = rcall("HLEN", processedKey)
  elseif ARGV[i] == "unprocessed" then
    results[#results+1] = rcall("SCARD", unprocessedKey)
  elseif ARGV[i] == "ignored" then
    results[#results+1] = rcall("HLEN", ignoredKey)
  else
    results[#results+1] = rcall("ZCARD", failedKey)
  end
end

return results