cc main

main.lua

-- Central Bank Server Script for Computercraft

-- Table to store account information
local accounts = {}

-- Load existing accounts from disk (if any)
local function loadAccounts()
    if fs.exists("accounts") then
        local file = fs.open("accounts", "r")
        accounts = textutils.unserialize(file.readAll())
        file.close()
    end
end

-- Save accounts to disk
local function saveAccounts()
    local file = fs.open("accounts", "w")
    file.write(textutils.serialize(accounts))
    file.close()
end

-- Handle a request from an ATM
local function handleRequest(senderID, request)
    local accountID = request.accountID
    local action = request.action
    local amount = request.amount

    -- Check if the account exists
    if accounts[accountID] == nil then
        return "Account not found"
    end

    if action == "balance" then
        -- Return the account balance
        return accounts[accountID].balance

    elseif action == "deposit" then
        -- Process deposit
        accounts[accountID].balance = accounts[accountID].balance + amount
        saveAccounts()
        return "Deposit successful"

    elseif action == "withdraw" then
        -- Process withdrawal
        if accounts[accountID].balance >= amount then
            accounts[accountID].balance = accounts[accountID].balance - amount
            saveAccounts()
            return "Withdrawal successful"
        else
            return "Insufficient funds"
        end
    else
        return "Invalid action"
    end
end

-- Main function
local function main()
    loadAccounts()

    -- Open modem
    local modem = peripheral.find("modem")
    if not modem then
        print("No modem attached")
        return
    end
    modem.open(1) -- Open on channel 1, for example

    -- Main loop
    while true do
        local event, side, senderChannel, replyChannel, message, senderDistance = os.pullEvent("modem_message")

        -- Check if the message is for the bank
        if senderChannel == 1 then
            local response = handleRequest(senderID, message)
            modem.transmit(replyChannel, 1, response)
        end
    end
end

-- Run the main function
main()