require "config"
require "math"
require "string"

local nargtypes = string.len(argtypes)
local nrettypes = string.len(rettypes)
local argrange  = maxargs - minargs
math.randomseed(seed)

function randomSignatures(nsigs)
  local i 
  for i = 1, nsigs do
    local nargs = minargs + math.random(argrange+1) - 1 
    local signature = ""
    for j = 1, nargs do
      local typeindex = math.random(nargtypes)
      signature = signature .. string.sub(argtypes, typeindex, typeindex)
    end
    local rtypeindex = math.random(nrettypes)
    signature = signature .. ")" .. string.sub(rettypes, rtypeindex, rtypeindex)
    io.write(signature .. "\n")
  end
end

function orderedSignature(x)
  local signature = ""
  local typeindex
  while true do
    if x < nargtypes then break end
    typeindex = 1 + math.mod(x, nargtypes)
    signature = signature .. string.sub(argtypes, typeindex, typeindex)
    x = math.floor( x / nargtypes )
  end
  typeindex = 1 + x
  signature = signature .. ")" .. string.sub(argtypes, typeindex, typeindex)
  return signature
end

function orderedSignatures(nsigs)
  local i 
  for i = 1, nsigs do
    io.write( orderedSignature(offset+i*step) .. "\n" )
  end
end

function designedSignatures()
 for line in io.lines(designfile) do
   io.write( line )
   io.write( "\n" )
 end
end

if mode == "random" then
  randomSignatures(nsigs)
elseif mode == "ordered" then
  orderedSignatures(nsigs)
elseif mode == "designed" then
  designedSignatures()
else
  error("'mode' must be 'random' or 'ordered'")
end

io.flush()