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local liste_client = {} -- ici, chaque élément sera un couple d'infos : ID client et pseudo

local idChannelLogin = 130
local idChannelAdmin = 131
local idChannelAdminRep = 13101
local idChannelMsgRec = 132
local idChannelMsgEnv = 133

local keygen = "azerty"

function attente_client()
        -- attente de connexion/déconnexion des clients
        print("lancement attente_client OK.")
        while true do
                modem.open(idChannelLogin)
                local event, modemSide, senderChannel, replyChannel, text, senderDistance = os.pullEvent("modem_message")
                if senderChannel == idChannelLogin then
                        local msg = textutils.unserialize(text)
                        if msg.key == keygen then
                                if msg.action == "login" then
                                        liste_client[msg.id] = msg.nickname
                                        print("Nouveau client : "..msg.id.." "..liste_client[msg.id])
                                elseif msg.action == "logout" then
                                        table.remove(liste_client, msg.id)
                                        print("logout du client : "..msg.id)
                                end
                        end
                end
                modem.close(idChannelLogin)
        end
end

function administration()
        -- envoi régulier d'infos aux clients
        print("lancement admin OK.")
        modem.open(idChannelAdmin)
        while true do

                local event, modemSide, senderChannel, replyChannel, text, senderDistance = os.pullEvent("modem_message")
                if text == "majliste" then
                        local msg = textutils.serialize(liste_client)
                        modem.transmit(idChannelAdminRep,idChannelAdmin,msg)
                        print("maj liste envoyee")
                end

        end
        modem.close(idChannelAdmin)
end

function echange_msg()
        -- reçoit et distribue les messages
        print("lancement echange_msg OK.")
        modem.open(idChannelMsgEnv)
        while true do
                --sleep(5)
                local event, modemSide, senderChannel, replyChannel, text, senderDistance = os.pullEvent("modem_message")
                if senderChannel == idChannelMsgEnv then
                        modem.transmit(idChannelMsgRec, idChannelMsgRec, text)
                end
        end
        modem.close(idChannelMsgEnv)
end

modem = peripheral.wrap("back")

term.clear()
term.setCursorPos(1,1)
print("ID du serveur : "..os.getComputerID())

parallel.waitForAny(attente_client, administration, echange_msg)

print("Fin du programme")