local pprint = require'pprint'
local enet = require'enet'
local json = require'dkjson'
local Pos = require'r.pos'
local pairs_except = require'r.pairs_except'
local class = require'r.class'

local host = enet.host_create('*:19683')

local n = 0
local function next_name() n=n+1  return 'helen'..n end

local Player = class()
function Player.make(cls, obj) return setmetatable(obj,cls) end
function Player.packet(self,packet_type) return json.encode     {
	name=self.name, x=self.pos.x, y=self.pos.y, type=packet_type } end

local size = 64
local chunk = {}
for i=1,size*size do chunk[i] = 1 == math.random(3) end
function chunk.packet(self,packet_type)
	local r = {type=packet_type,d={}}  for i,t in ipairs(self) do r.d[i]=t end
	return json.encode(r) end

local players = {}
local function find_player(arg) local k,v = next(arg)
	for pl in pairs(players) do if pl[k] == v then return pl end end end
local function other_players(player) return pairs_except(players, player) end

local function send_others(player,data)
	data.from = player.name   local packet = json.encode(data)
	for player2 in other_players(player) do player2.peer:send(packet) end end

local function greet(player)
	for player2 in other_players(player) do
		player.peer:send(player2:packet'player')
		player2.peer:send(player:packet'player') end
	player.peer:send(chunk:packet'chunk')        end

while true do  local ev = host:service(100)  if ev then
	local peer = ev.peer  local player = find_player{peer=peer}
	if ev.type=='connect' then
		print('connecting',peer)
		local player = Player{pos=Pos(0,0), peer=peer, name=next_name()}
		players[player] = true;  greet(player)
	elseif ev.type=='disconnect' then
		print('disconnecting',peer)
		send_others(player, {type='unplayer'})
		players[player] = nil 
	else local j = json.decode(ev.data)
		-- todo handle json error
		if j.type == 'move' then player.pos=Pos(j.x,j.y)  send_others(player, j)
		end
	end
end end