function OpenAll()
        for _,side in ipairs(rs.getSides()) do
                rednet.open(side)
        end
end

function split(str, pat)
	local t = { }
	local fpat = "(.-)"..pat
	local last_end = 1
	local s, e, cap = str:find(fpat, 1)
		while s do
			if s ~= 1 or cap ~= "" then
				table.insert(t,cap)
			end
			last_end = e+1
			s, e, cap = str:find(fpat, last_end)
		end
		if last_end <= #str then
			cap = str:sub(last_end)
			table.insert(t, cap)
	end
	return t
end

function runApp()
	OpenAll()
	id, msg, d = rednet.receive()
	if msg ~= nil then
		t = split(msg, "!SP!")
		usr = t[1]
		cmd = t[2]
		if cmd == nil then
			runApp()
		end
		print("--------------------------------------------------")
		print("USER: "..usr)
		print("COMMAND: "..cmd)
		if cmd == "search" then
			usr2 = t[3]
			print("USER 2: "..usr2)
			print("--------------------------------------------------")
		elseif cmd == "status update" then
			status = t[3]
			print("STATUS: "..status)
			print("--------------------------------------------------")
		elseif cmd == "makeUser" then
			password = t[3]
			print("PASSWORD: "..password)
			print("--------------------------------------------------")
		elseif cmd == "logIn" then
			password = t[3]
			print("PASSWORD: "..password)
			print("--------------------------------------------------")
		elseif cmd == "sndfrq" then
			usr2 = t[3]
			print("USER 2: "..usr2)
			print("--------------------------------------------------")
		elseif cmd == "add friend" then
			usr2 = t[3]
			print("USER 2: "..usr2)
			print("--------------------------------------------------")
		elseif cmd == "list" then
			print("--------------------------------------------------")
		elseif cmd == "deleteUser" then
			usr2 = t[3]
			print("--------------------------------------------------")
		elseif cmd == "listUsers" then
			print("--------------------------------------------------")
		end
		if cmd == "search" then
			if fs.isDir("RedBook/"..usr2) == false then
				rednet.send(id, "USER DOES NOT EXIST")
			else
				if fs.exists("RedBook/"..usr2.."/status") == true then
					usrstatus1 = fs.open("RedBook/"..usr2.."/status", "r")
					usrstatus = usrstatus1.readAll()
					usrstatus1.close()
				end
				x = usr2.."!SP!"..usrstatus.."!SP!"
				rednet.send(id, x)
			end
			runApp()
		elseif cmd == "status update" then
			f = fs.open("RedBook/"..usr.."/status", "w")
			f.write(status)
			f.close()
			runApp()
		elseif cmd == "list" then
			h = fs.open("RedBook/"..usr.."/friendlist", "a")
			h.close()
			friends = fs.open("RedBook/"..usr.."/friendlist", "r")
			xyz = friends.readAll()
			print(xyz)
			rednet.send(id, xyz)
			runApp()
		elseif cmd == "sndfrq" then
			check = fs.open("RedBook/"..usr2.."/friendlist", "r")
			chck2 = check.readAll()
			chck3 = split(chck2, "!SP!")
			check.close()
			a = fs.open("RedBook/"..usr2.."/friendreq", "a")
			a.write("RedBook/"..usr.."!SP!")
			a.close()
			runApp()
		elseif cmd == "chck frnd req" then
			if fs.exists("RedBook/"..usr.."/friendreq") == false then
				go = fs.open(usr.."/friendreq", "a")
				go.close()
			end
			chck = fs.open("RedBook/"..usr.."/friendreq", "r")
			cv = chck.readAll()
			chck.close()
			clear = fs.open("RedBook/"..usr.."/friendreq", "w")
			clear.close()
			print(cv)
			rednet.send(id, cv)
			print("SENT")
			print("--------------------------------------------------")
			chck.close()
			runApp()
		elseif cmd == "add friend" then
			print(usr2)
			nFriend = usr2.."!SP!"
			nFriend2 = usr.."!SP!"
			print(nFriend)
			gol = fs.open("RedBook/"..usr.."/friendlist", "a")
			gol.write(nFriend)
			gol.close()
			gold = fs.open("RedBook/"..usr2.."/friendlist", "a")
			gold.write(nFriend2)
			gold.close()
			runApp()
		elseif cmd == "logIn" then
			if fs.isDir("RedBook/"..usr) == true then
				w = fs.open("RedBook/"..usr.."/password", "r")
				y = w.readAll()
				if y == password then
					rednet.send(id, "YOU HAVE BEEN LOGGED IN")
				else
					rednet.send(id, "ERROR: WRONG PASSWORD")
				end
			else
				rednet.send(id, "ERROR: WRONG USERNAME")
			end
			runApp()
		elseif cmd == "makeUser" then
			fs.makeDir("RedBook/"..usr)
			make1 = fs.open("RedBook/"..usr.."/friendreq", "a")
			make1.close()
			make2 = fs.open("RedBook/"..usr.."/status", "a")
			make2.close()
			make3 = fs.open("RedBook/"..usr.."/friendlist", "a")
			make3.close()
			make4 = fs.open("RedBook/"..usr.."/password", "w")
			make4.write(password)
			make4.close()
			rednet.send(id, "USER HAS BEEN CREATED")
			runApp()
		elseif cmd == "listUsers" then
			list = fs.list("RedBook/")
			list2 = textutils.serialize(list)
			rednet.send(id, list2)
			runApp()
		elseif cmd == "deleteUser" then
			if fs.exists("RedBook/"..usr2) then
				fs.delete("RedBook/"..usr2)
				rednet.send(id, "USER IS GONE >:^D")
			else
				rednet.send(id, "USER DOES NOT EXIST")
			end
			runApp()
		end
	end
end

runApp()