local backend = {}
local network = require("entrypointlib")
local loop = coroutine.create(network.loop)
local filter = nil

-- some black magic bs that i pulled from https://gist.github.com/MCJack123/473475f07b980d57dd2bd818026c97e8
local env = getfenv(rednet.run)
env.os = setmetatable({
    pullEventRaw = function ()
        local ev = table.pack(coroutine.yield())
        if filter == nil or filter == ev[1] then
            _,filter = coroutine.resume(loop,table.unpack(ev, 1, ev.n))
        end
        return table.unpack(ev, 1, ev.n)
    end
},{__index=env.os})

local target = nil
function backend.setTarget(id)
    target = id
end

function backend.sendMessage(msg, id)
    if not (id or target) then error("failed to imply or specify target id",2) end
    network.send(msg,id or target)
end

function backend.receiveMessage()
    local _,msg,id,hops
    repeat
        _,msg,id,hops = os.pullEvent("network_packet")
    until id == (target or id)
    return msg,id
end

return backend