local cqueues = require 'cqueues'
local socket = require 'cqueues.socket'
local class = require 'r.class'

local BasePylon = require 'pylon'
local Channel = require 'channel'

local Nanochat = class.extend(BasePylon)

function Nanochat:init()
	self:_check_fields "server port poll"
end

function Nanochat:_connect()
	self.sock = socket.connect(self.server, tonumber(self.port))
	self.sock:write("LAST 0\n")
	self.sock:read("*l") -- discard count
	self.lastid = tonumber(assert(self.sock:read("*l")))
	self.usids = {}
end

function Nanochat:recving()
	while true do
		self.sock:write("SKIP "..self.lastid.."\n")
		local deliverables = {} -- holey
		local n = tonumber(assert(self.sock:read("*l")))
		for i=1,n do
			local msg = assert(self.sock:read("*l"))
			local chan, msgi = msg:match("^([^ ]+) ()")
			if chan then
				local sender, body = msg:match("^([^:]+): (.+)$", msgi)
				if sender then
					deliverables[i] = { source_channel=Channel(self, chan), sender=sender, body=body }
				else
					deliverables[i] = { source_channel=Channel(self, chan), sender="", body=msg:sub(msgi,-1) }
				end
			else
				-- ignore messages without a channel, they stay nanochat-local
			end
		end
		local s = self.sock:read("*l")
		self.lastid = tonumber(assert(s))

		for i=1,n do
			local msg = deliverables[i] ; if msg then
				local id = i - n + self.lastid
				if self.usids[id] then
					self.usids[id] = nil
				else
					self.log:proto('<', msg.source_channel.descriptor, msg.sender, msg.body)
					self.wilson:deliver(msg)
				end
			end
		end

		cqueues.sleep(tonumber(self.poll))
	end
end

function Nanochat:sending()
	for dest_channel, message in self.inbox:iter() do
		self.log:proto('>',dest_channel,message.sender,message.body)
		assert(self.sock:write("SEND "..dest_channel.descriptor.." ["..message.source_channel.pylon.shortname.."] "..message.sender..": "..message.body.."\n"))
		local id = tonumber(assert(self.sock:read("*l")))
		self.usids[id] = true
	end
end


return Nanochat