-- httpserver-static.lua
-- Part of nodemcu-httpserver, handles sending static files to client.
-- Author: Marcos Kirsch

return function (connection, req, args)
   --print("Begin sending:", args.file)
   --print("node.heap(): ", node.heap())
   if args.isGzipped and req.isCheckModifiedRequest() then
      -- todo: really check if file updated
      dofile("httpserver-header.lc")(connection, 304, args.ext, args.isGzipped)
   else
      dofile("httpserver-header.lc")(connection, 200, args.ext, args.isGzipped)
      -- Send file in little chunks
      local continue = true
      local size = file.list()[args.file]
      local bytesSent = 0
      -- Chunks larger than 1024 don't work.
      -- https://github.com/nodemcu/nodemcu-firmware/issues/1075
      local chunkSize = 1024
      while continue do
         collectgarbage()

         -- NodeMCU file API lets you open 1 file at a time.
         -- So we need to open, seek, close each time in order
         -- to support multiple simultaneous clients.
         file.open(args.file)
         file.seek("set", bytesSent)
         local chunk = file.read(chunkSize)
         file.close()

         connection:send(chunk)
         bytesSent = bytesSent + #chunk
         chunk = nil
         --print("Sent: " .. bytesSent .. " of " .. size)
         if bytesSent == size then continue = false end
      end
      --print("Finished sending: ", args.file)
   end
end
