local lib = {}
local expect = require "cc.expect".expect
local file = fs.open("/repos.dat","r")
local repos = {}
if file then
    repos = textutils.unserialise(file.readAll() or "") or repos
end
local function saveRepos()
    local file = fs.open("/repos.dat","w")
    file.write(textutils.serialise(repos))
    file.close()
end
function lib.addRepo(id)
    expect(1,id,"number")
    repos[id] = "computer"
    saveRepos()
end
function lib.getRepos()
    return repos
end
function lib.rmRepo(id)
    expect(1,id,"number")
    repos[id] = nil
    saveRepos()
end
function lib.listPackages(type)
    local queued_requests = {}
    local recorded_packages = {}
    for k,v in pairs(repos) do
        if v == "computer" then
            network.send({proto="query",package_type=type},k)
            queued_requests[k] = "computer"
        end 
    end
    local next_timestamp = os.clock()+5
    repeat
        local event = {os.pullEvent()}
        if event[1] == "network_packet" then
            if queued_requests[event[3]] == "computer" and event[2].proto == "query_resp" and event[2].package_type == type then
                for name,data in pairs(event[2].data) do
                    if recorded_packages[name] then
                        recorded_packages[name].repos[event[3]] = event[4]
                    else
                        data.repos = {[event[3]] = event[4]}
                        recorded_packages[name] = data
                    end
                end
            end
        end
    until next(queued_requests) == nil or os.clock() >= next_timestamp
    return recorded_packages
end

_G.repo = lib