index

local computerId = os.getComputerID()
local monitor = peripheral.find("monitor")
local modem = peripheral.find("modem")

if modem == nil then
    error("Aucun modem disponible.")
    return
end

local function findModem()
    local sides = { "top", "bottom", "left", "right", "back", "front" }

    for _, side in ipairs(sides) do
        if peripheral.isPresent(side) and peripheral.getType(side) == "modem" then
            return side
        end
    end

    return nil
end

local function promptQuestion(question, options)
    term.clear()
    term.setCursorPos(1, 1)
    print(question)

    local selectedOption = 1
    local numOptions = #options

    while true do
        for i, option in ipairs(options) do
            if i == selectedOption then
                print("> " .. option)
            else
                print("  " .. option)
            end
        end

        local _, key = os.pullEvent("key")

        if key == keys.up then
            selectedOption = selectedOption - 1
            if selectedOption < 1 then
                selectedOption = numOptions
            end
        elseif key == keys.down then
            selectedOption = selectedOption + 1
            if selectedOption > numOptions then
                selectedOption = 1
            end
        elseif key == keys.enter then
            break
        end

        term.clear()
        term.setCursorPos(1, 1)
        print(question)
    end

    return selectedOption
end

local function generateRandomHostname()
    local randomSuffix = ""
    local randomLength = 5
    local characters = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"

    for i = 1, randomLength do
        local randomIndex = math.random(1, #characters)
        randomSuffix = randomSuffix .. string.sub(characters, randomIndex, randomIndex)
    end

    local hostname = "NetTchat-" .. randomSuffix
    return hostname
end

local function connectToServer(protocol, hostname)
    local modemSide = findModem()
    rednet.open(modemSide)
    term.clear()
    print(string.format("Tentative de connexion à %s sur le protocol : %s...", hostname, protocol))
    local serverId = rednet.lookup(protocol)

    if serverId then
        rednet.send(serverId, "Demande de connexion", protocol) -- Envoyer une demande de connexion au serveur
        print("Connexion établie avec le serveur #" .. serverId)
        return true
    else
        print("Aucun serveur trouvé pour le protocole : " .. protocol)
        return false
    end
end

local function startOnClient()
    term.clear()
    term.setCursorPos(1, 1)

    print("=== Configuration ===")
    print("Entrez le nom du protocole :")
    term.setCursorPos(1, 4)
    write("> ")
    local selectedProtocol = read()

    print("Entrez le nom d'hôte du serveur:")
    term.setCursorPos(1, 6)
    write("> ")
    local selectedHostname = read()

    if connectToServer(selectedProtocol, selectedHostname) then
        -- Gérer la suite de votre application une fois connecté au serveur
    else
        print("Impossible de se connecter au serveur.")
    end
end

local function startOnServer()
    term.clear()
    local protocol = "chat"
    local hostname = generateRandomHostname()

    local credits = "NetTchat, created and designed by _Tsyke_ | Ver: 0.1"
    local creditsScale = 0.5
    local width, height = monitor.getSize()

    local creditsWidth = #credits * creditsScale
    local creditsX = math.floor(width - creditsWidth + 1)
    local creditsY = height - 1

    monitor.setCursorPos(creditsX, creditsY)
    monitor.setTextScale(creditsScale)
    monitor.write(credits)

    os.sleep(2)

    monitor.clear()
    monitor.setCursorPos(1, 1)
    monitor.setTextScale(1)

    local title = string.format("Serveur NetTchat démarré sur le Computer #%s :", os.getComputerID())
    local underline = string.rep("-", #title)

    monitor.write(title)
    monitor.setCursorPos(1, 2)
    monitor.write(underline)

    monitor.setCursorPos(1, 4)
    monitor.write(string.format("Hostname : %s", hostname))

    monitor.setCursorPos(1, 5)
    monitor.write(string.format("Protocol : %s", protocol))

    local modemSide = findModem()
    rednet.open(modemSide)
    rednet.host(protocol, hostname)

    print("Serveur démarré. Attente des connexions...")

    while true do
        local senderId, message, receivedProtocol = rednet.receive(protocol)

        if receivedProtocol == protocol then
            print("Message reçu de #" .. senderId .. ": " .. message)
        end
    end
end

local function start()
    local question = "Choisissez une option :"
    local options = {
        string.format("Utiliser \"Computer #%s\" comme serveur", computerId),
        string.format("Utiliser \"Computer #%s\" comme client", computerId)
    }

    term.clear()

    local selected = promptQuestion(question, options)
    if selected == 1 then
        startOnServer()
    elseif selected == 2 then
        startOnClient()
    end
end

start()