-- This is released into the public domain.
-- No warranty is provided, implied or otherwise.

local event = require("event")(neo)
local neoux = require("neoux")(event, neo)

local primaryINet = neo.requireAccess("c.internet", "internet access").list()()

-- Enter URL dialog
local running = true
local sRunning = true
-- useful to perform a system update
local url = "http://20kdc.duckdns.org/neo/inst.lua"
local function doWorking()
 return 50, 1, nil, neoux.tcwindow(50, 1, {
  neoux.tcrawview(1, 1, {"Downloading now..."}),
 }, function (w)
  sRunning = false
 end, 0xFFFFFF, 0)
end
local function doMainWin()
 return 50, 3, nil, neoux.tcwindow(50, 3, {
  neoux.tcrawview(1, 1, {"URL to download?"}),
  neoux.tcfield(1, 2, 50, function (t)
   url = t or url
   return url
  end),
  neoux.tcbutton(41, 3, "Download", function (w)
   sRunning = true
   w.reset(doWorking())
   local nurl = url
   local fd = neoux.fileDialog(true)
   if not fd then
    w.reset(doMainWin())
    return
   end
   -- download!
   local req, err = primaryINet.request(nurl)
   if not req then
    fd.close()
    neoux.startDialog("failed request:\n" .. tostring(err))
    w.reset(doMainWin())
    return
   end
   -- OpenComputers#535
   req.finishConnect()
   while sRunning do
    local n, n2 = req.read(neo.readBufSize)
    if not n then
     if n2 then
      neoux.startDialog("failed download:\n" .. tostring(n2))
      break
     else
      break
     end
    else
     if n == "" then
      event.sleepTo(os.uptime() + 0.05)
     else
      local o, r = fd.write(n)
      if not o then
       neoux.startDialog("failed write:\n" .. tostring(r))
       break
      end
     end
    end
   end
   pcall(req.close)
   pcall(fd.close)
   w.reset(doMainWin())
  end)
 }, function (w)
  w.close()
  running = false
 end, 0xFFFFFF, 0)
end
local w = neoux.create(doMainWin())

while running do
 event.pull()
end