bankserver

-- make a clients.txt, "whitelist.txt", log.txt, and "items.txt" file
myusername = "username"
mypassword = "password"

function messageWhitelistItems(whitelist, itemlist)
    rednet.open("top")
    computers = getDatabase(whitelist)
    if #computers ~= 0 then
        for _, line in pairs(computers) do
            if tonumber(line) ~= nil then
                rednet.send(tonumber(line), "itemlist please")
                rednet.send(tonumber(line), getAllItems(itemlist))
            end
        end
    end
end

function displayLog(filename, scrollPosition, maxLines)
    local instruction = "Press Backspace to Leave"
    local database = getDatabase(filename)  -- Retrieve the database using your existing function
    table.insert(database, 1, instruction)
    local startIndex = math.max(1, scrollPosition)
    local endIndex = math.min(#database, scrollPosition + maxLines - 1)

    while true do
        term.clear()
        -- Display the instruction
        print(instruction)

        -- Display the database content after the instruction
        for i = startIndex, endIndex do
            print(database[i])
        end

        local event, key = os.pullEvent("key")
        if key == keys.up then
            scrollPosition = math.max(1, scrollPosition - 1)
        elseif key == keys.down then
            scrollPosition = math.min(#database - maxLines + 1, scrollPosition + 1)
        elseif key == keys.backspace then
            break  -- Exit loop on backspace key press
        end

        startIndex = math.max(1, scrollPosition)
        endIndex = math.min(#database, scrollPosition + maxLines - 1)
    end
end


function dateTime()
    time = os.epoch("local") / 1000
    time_table = os.date("*t", time)
    return os.date("%Y-%m-%d %H:%M:%S", currentTime)
end

function log(id, line, success)
    local file = fs.open("log.txt", "a")
    file.writeLine(dateTime() .. " | Computer " .. tostring(id) .. " - " .. line .. " | Success = " .. tostring(success))
    file.close()
end

function addItem(item, value, filename, whitelist)
    local file = fs.open(filename, "a") -- Open file in append mode

    if not file then
        print("Error: Unable to open file for appending.")
        return
    end

    file.writeLine(item .. " " .. value)
    file.close()
    messageWhitelistItems(whitelist, filename)
end

function getItem(item, filename)
    -- Open the file for reading
    local file = fs.open(filename, "r")

    -- Read and process each line of the file
    local line = file.readLine()
    while line do
        if twoInputStrip(line) == item then
            return line
        end
        line = file.readLine()
    end
    file.close()
    return nil
end

function getAllItems(filename)
    -- Open the file for reading
    local file = fs.open(filename, "r")

    -- Read and process each line of the file
    local line = file.readLine()
    local itemdatabase = {}
    while line do
        table.insert(itemdatabase, line)
        line = file.readLine()
    end
    file.close()
    return itemdatabase
end

function deleteItem(item, filename, whitelist)
    ditem = getItem(item, filename)
    if ditem ~= nil then
        database = getAllItems(filename)
        local file = fs.open(filename, "w")
        for _, line in pairs(database) do
            if line ~= ditem then
                file.write(line .. "\n")
            end
        end
        file.close()
        messageWhitelistItems(whitelist, filename)
    else
        print(number, " not found in database")
    end
end

function addComputer(number, filename)
    local file = fs.open(filename, "a") -- Open file in append mode

    if not file then
        print("Error: Unable to open file for appending.")
        return
    end

    -- Write the number to the file
    file.writeLine(tostring(number))
    file.close()

    print("Computer " .. number .. " added to the whitelist.")
end


function getComputer(number, filename)
    local file = fs.open(filename, "r")
    local line = file.readLine()
    while line do
        if tonumber(number) == tonumber(line) then
            -- Print the separated components
            file.close()
            return true
        end
        line = file.readLine()
    end
    file.close()
    return false
end

function deleteComputer(number, filename)
    if getComputer(number, filename) then
        database = getDatabase(filename)
        local file = fs.open(filename, "w")
        for _, line in pairs(database) do
            if tonumber(line) ~= tonumber(number) then
                file.write(line .. "\n")
            end
        end
        file.close()
    else
        print(number, " not found in database")
    end
end

function stripLine(line)
    username, password, value, address = line:match("([^|]+)|([^|]+)|([^|]+)|([^|]+)")
    return username, password, value, address
end

function twoInputStrip(str)
    first, second = str:match("(%S+)%s+(%S+)")
    return first, second
end

function threeInputStrip(str)
    first, second, third = str:match("(%S+)%s+(%S+)%s+(%S+)")
    return first, second, third
end

function fourInputStrip(str)
    first, second, third, fourth = str:match("(%S+)%s+(%S+)%s+(%S+)%s+(%S+)")
    return first, second, third, fourth
end

function fiveInputStrip(str)
    first, second, third, fourth, five = str:match("(%S+)%s+(%S+)%s+(%S+)%s+(%S+)%s+(%S+)")
    return first, second, third, fourth, five
end

function searchDatabase(u, filename)
    local file = fs.open(filename, "r")
    local line = file.readLine()
    while line do
        -- Split the line into string and double components
        local username, password, value = stripLine(line)
        if u == username and string.len(u) == string.len(username) then
            file.close()
            return username, password
        end

        -- Read the next line
        line = file.readLine()
    end
    file.close()
end

function getDatabase(filename)
     -- Open the file for reading
    local file = fs.open(filename, "r")

    -- Read and process each line of the file
    local line = file.readLine()
    local database = {}
    while line do
        table.insert(database, line)
        line = file.readLine()
    end
    file.close()
    return database
end


function getValue(u, filename)
    -- Open the file for reading
    local file = fs.open(filename, "r")

    -- Read and process each line of the file
    local line = file.readLine()
    while line do
        -- Split the line into string and double components
        local username, password, value = stripLine(line)

        if u == username then
            -- Print the separated components
            file.close()
            return value
        end

        -- Read the next line
        line = file.readLine()
    end
    file.close()
end

function getAddress(u, filename)
    -- Open the file for reading
    local file = fs.open(filename, "r")

    -- Read and process each line of the file
    local line = file.readLine()
    while line do
        -- Split the line into string and double components
        local username, password, value, address = stripLine(line)

        if u == username then
            -- Print the separated components
            file.close()
            return address
        end

        -- Read the next line
        line = file.readLine()
    end
    file.close()
end

function addUser(u, p, v, a, filename)
    -- Open the file for reading
    local file = fs.open(filename, "a")
    if searchDatabase(u, filename) == nil then
        file.write(u .. "|" .. p .. "|" .. v .. "|" .. a .. "\n")
        file.close()
        print("Client Added")
        return true
    else
        print("Client Already in Database")
    end
    file.close()
end

function deleteUser(u, filename)
    if searchDatabase(u, filename) ~= nil then
        database = getDatabase(filename)
        local file = fs.open(filename, "w")
        for _, line in pairs(database) do
            username, password, value = stripLine(line)
            if username ~= u then
                file.write(line .. "\n")
            end
        end
        file.close()
    else
        print(u, " not found in database")
    end
end

function changeUsername(u, nu, filename)
    if searchDatabase(u, filename) ~= nil then
        database = getDatabase(filename)
        local file = fs.open(filename, "w")
        for _, line in pairs(database) do
            username, password, value, address = stripLine(line)
            if username ~= u then
                file.write(line .. "\n")
            else
                file.write(nu .. "|" .. password .. "|" .. value .. "|" .. address .. "\n")
            end
        end
        file.close()
    else
        print(u, " not found in database")
    end
end

function changePassword(u, np, filename)
    if searchDatabase(u, filename) ~= nil then
        database = getDatabase(filename)
        local file = fs.open(filename, "w")
        for _, line in pairs(database) do
            username, password, value = stripLine(line)
            if username ~= u then
                file.write(line .. "\n")
            else
                file.write(username .. "|" .. np .. "|" .. value .. "|" .. address .. "\n")
            end
        end
        file.close()
    else
        print(u, " not found in database")
    end
end

function changeValue(u, nv, filename)
    if searchDatabase(u, filename) ~= nil then
        database = getDatabase(filename)
        local file = fs.open(filename, "w")
        for _, line in pairs(database) do
            username, password, value = stripLine(line)
            if username ~= u then
                file.write(line .. "\n")
            else
                file.write(username .. "|" .. password .. "|" .. nv .. "|" .. address .. "\n")
            end
        end
        file.close()
    end
end

function changeAddress(u, na, filename)
    if searchDatabase(u, filename) ~= nil then
        database = getDatabase(filename)
        local file = fs.open(filename, "w")
        for _, line in pairs(database) do
            username, password, value = stripLine(line)
            if username ~= u then
                file.write(line .. "\n")
            else
                file.write(username .. "|" .. password .. "|" .. value .. "|" .. na .. "\n")
            end
        end
        file.close()
    end
end

local function displayClientMenu()
    print("User Menu")
    print("1. Add user")
    print("2. Delete user")
    print("3. Change username")
    print("4. Change password")
    print("5. Change balance")
    print("6. Change address")
    print("7. Display database")
    print("8. Display user")
    print("0. Exit")
end

local function displayWhitelistMenu()
    print("1. Add a Computer")
    print("2. Display Whitelist")
    print("3. Delete Computer")
    print("4. Display Log")
    print("0. Exit")
end

local function itemMenu()
    print("1. Add an Item")
    print("2. Display Items")
    print("3. Remove an Item")
    print("0. Exit")
end

-- Function to display the menu
local function displayMenu()
    print("User Menu")
    print("1. clientMenu")
    print("2. whitelistMenu")
    print("3. itemMenu")
    print("4. Turn Off Server")
    print("0. Exit")
end

-- Main function to handle user input
local function main(filename, whitelist, itemlist)
    while true do
        shell.run("clear")
        displayMenu()
        io.write("Enter your choice: ")
        local gchoice = tonumber(io.read())
        if gchoice == 1 then
            shell.run("clear")
            while true do
                displayClientMenu()
                io.write("Enter your choice: ")
                local choice = tonumber(io.read())
                if choice == 1 then
                    print("Adding a new user")
                    print("Enter username:")
                    local username = io.read()
                    print("Enter password:")
                    local password = io.read()
                    print("Enter value:")
                    local value = tonumber(io.read())
                    print("Enter address (format: x,y,z):")
                    local address = io.read()
                    -- Add user to the database
                    addUser(username, password, value, address, filename)
                    io.write("Press Anything to Continue: ")
                    io.read()
                    shell.run("clear")
                elseif choice == 2 then
                    print("Deleting a user")
                    print("Enter username to delete:")
                    local username = io.read()
                    -- Delete user from the database
                    deleteUser(username, filename)
                    io.write("Press Anything to Continue: ")
                    io.read()
                    shell.run("clear")
                elseif choice == 3 then
                    print("Changing username")
                    print("Enter username to change:")
                    local oldUsername = io.read()
                    print("Enter new username:")
                    local newUsername = io.read()
                    -- Change username in the database
                    changeUsername(oldUsername, newUsername, filename)
                    io.write("Press Anything to Continue: ")
                    io.read()
                    shell.run("clear")
                elseif choice == 4 then
                    print("Changing password")
                    print("Enter username:")
                    local username = io.read()
                    print("Enter new password:")
                    local newPassword = io.read()
                    -- Change password in the database
                    changePassword(username, newPassword, filename)
                    io.write("Press Anything to Continue: ")
                    io.read()
                    shell.run("clear")
                elseif choice == 5 then
                    print("Changing balance")
                    print("Enter username:")
                    local username = io.read()
                    print("Enter new value:")
                    local newValue = tonumber(io.read())
                    -- Change value in the database
                    changeValue(username, newValue, filename)
                    io.write("Press Anything to Continue: ")
                    io.read()
                    shell.run("clear")
                elseif choice == 6 then
                    print("Changing address")
                    print("Enter username:")
                    local username = io.read()
                    print("Enter new address:")
                    local newAddress = io.read()
                    changeAddress(username, newAddress, filename)
                    io.write("Press Anything to Continue: ")
                    io.read()
                    shell.run("clear")
                elseif choice == 7 then
                    print("Displaying database")
                    -- Display the database
                    database = getDatabase(filename)
                    print("\n")
                    for _, line in pairs(database) do
                        username, password, value, address = stripLine(line)
                        print(username, " ", password, " ", value, " ",  address, "\n")
                    end
                    io.write("Press Anything to Continue: ")
                    io.read()
                    shell.run("clear")
                elseif choice == 8 then
                    print("Enter username:")
                    local username = io.read()
                    username, password = searchDatabase(username, filename)
                    if username == nil then
                        print("User not Found")
                    else
                        print(username, " ", password, " ", getValue(username, filename), "\n")
                    end
                    io.write("Press Anything to Continue: ")
                    io.read()
                    shell.run("clear")
                elseif choice == 0 then
                    print("Exiting...")
                    shell.run("clear")
                    break
                else
                    print("Invalid choice. Please try again.")
                end
            end
        elseif gchoice == 2 then
            shell.run("clear")
            while true do
                displayWhitelistMenu()
                io.write("Enter your choice: ")
                local choice = tonumber(io.read())
                if choice == 1 then
                    print("Enter the Computers ID:")
                    local id = io.read()
                    addComputer(id, whitelist)
                    io.write("Press Anything to Continue: ")
                    io.read()
                    shell.run("clear")
                elseif choice == 2 then
                    print("Displaying database")
                    -- Display the database
                    computers = getDatabase(whitelist)
                    print("\n")
                    for _, line in pairs(computers) do
                        print(line, "\n")
                    end
                    io.write("Press Anything to Continue: ")
                    io.read()
                    shell.run("clear")
                elseif choice == 3 then
                    print("Enter the Computers ID:")
                    local id = io.read()
                    deleteComputer(id, whitelist)
                    io.write("Press Anything to Continue: ")
                    io.read()
                    shell.run("clear")
                elseif choice == 4 then
                    shell.run("clear")
                    displayLog("log.txt", 1, 10)
                    shell.run("clear")
                elseif choice == 0 then
                    print("Exiting...")
                    shell.run("clear")
                    break
                else
                    print("Invalid choice. Please try again.")
                end
            end
        elseif gchoice == 3 then
            while true do
                itemMenu()
                io.write("Enter your choice: ")
                local choice = tonumber(io.read())
                if choice == 1 then
                    print("Adding a new item")
                    print("Enter item minecraft name:")
                    local iname = io.read()
                    print("Enter item value:")
                    local ivalue = io.read()
                    -- Add user to the database
                    addItem(iname, ivalue, itemlist, whitelist)
                    io.write("Press Anything to Continue: ")
                    io.read()
                    shell.run("clear")
                elseif choice == 2 then
                    print("Displaying items")
                    -- Display the database
                    database = getAllItems(itemlist)
                    print("\n")
                    for _, line in pairs(database) do
                        print(line, "\n")
                    end
                    io.write("Press Anything to Continue: ")
                    io.read()
                    shell.run("clear")
                elseif choice == 3 then
                    print("Deleting an item")
                    print("Enter item minecraft name:")
                    local iname = io.read()
                    deleteItem(iname, itemlist, whitelist)
                    io.write("Press Anything to Continue: ")
                    io.read()
                    shell.run("clear")
                elseif choice == 0 then
                    print("Exiting...")
                    shell.run("clear")
                        break
                else
                    print("Invalid choice. Please try again.")
                end
            end
        elseif gchoice == 4 then
            return true
        elseif gchoice == 0 then
            print("Exiting...")
            shell.run("clear")
            break
        else
            print("Invalid choice. Please try again.")
        end
    end
end

local function serverCoroutine(filename, whitelist, itemlist)
    orders = {}
    while true do
        gsuccess = false
        -- Listen for incoming messages
        local senderId, message = rednet.receive()
        if getComputer(senderId, whitelist) then
            success, command, line = pcall(twoInputStrip, message)
            if success and line ~= nil then
                if command == "balance" then
                    success, command, nusername, npassword, balancechange = pcall(fourInputStrip, message)
                    if success and nusername ~= nil and npassword ~= nil and balancechange ~= nil then
                        dusername, dpassword = searchDatabase(nusername, filename)
                        if tostring(dusername) ~= nil and tostring(dpassword) ~= nil then
                            if npassword == dpassword then
                                nv = tonumber(getValue(nusername, filename)) + tonumber(balancechange)
                                changeValue(nusername, nv, filename)
                                rednet.send(senderId, getValue(nusername, filename))
                                gsuccess = true
                            end
                        end
                    end
                elseif command == "address" then
                    success, command, nusername, npassword, balancechange = pcall(fourInputStrip, message)
                    if success and nusername ~= nil then
                        dusername, dpassword = searchDatabase(nusername, filename)
                        daddress = getAddress(dusername, filename)
                        if tostring(dusername) ~= nil and daddress ~= nil then
                            rednet.send(senderId, daddress)
                            gsuccess = true
                        end
                    end
                end
            end
        end
        success, command, line = pcall(twoInputStrip, message)
        if success and line ~= nil then
            if command == "buy" then
                success, command, nusername, npassword, balancechange = pcall(fourInputStrip, message)
                if success and nusername ~= nil and npassword ~= nil and balancechange ~= nil then
                    dusername, dpassword = searchDatabase(nusername, filename)
                    if tostring(dusername) ~= nil and tostring(dpassword) ~= nil then
                        if npassword == dpassword then
                            if tonumber(balancechange) >= 0 and tonumber(getValue(nusername, filename)) >= tonumber(balancechange) then
                                nv = tonumber(getValue(nusername, filename)) - tonumber(balancechange)
                                changeValue(nusername, nv, filename)
                                rednet.send(senderId, getValue(nusername, filename))
                                gsuccess = true
                                if orders ~= nil then
                                    for i, order in ipairs(orders) do
                                        print(order)
                                        print(tonumber(order[2]) == tonumber(balancechange))
                                        print(tonumber(order[3]) == tonumber(id))
                                        print(tonumber(order[3]))
                                        print(tonumber(senderId))
                                        if tonumber(order[2]) == tonumber(balancechange) and tonumber(order[3]) == tonumber(senderId) then
                                            cashierId = tonumber(order[1])
                                            print(cashierId)
                                            rednet.send(cashierId, "true")
                                            table.remove(orders, i)
                                            break
                                        end
                                    end
                                end
                            end
                        end
                    end
                end
            elseif command == "search" then
                success, command, nusername, npassword = pcall(threeInputStrip, message)
                if success and nusername ~= nil and npassword ~= nil then
                    dusername, dpassword = searchDatabase(nusername, filename)
                    if tostring(dusername) ~= nil and tostring(dpassword) ~= nil then
                        if npassword == dpassword then
                            rednet.send(senderId, getValue(nusername, filename))
                            gsuccess = true
                        end
                    end
                end
            elseif command == "transfer" then
                success, command, nusername, npassword, balancechange, nusername2 = pcall(fiveInputStrip, message)
                if success and nusername ~= nil and npassword ~= nil and balancechange ~= nil and nusername2 ~= nil and nusername ~= nusername2 then
                    dusername, dpassword = searchDatabase(nusername, filename)
                    nusername2 = searchDatabase(nusername2, filename)
                    if tostring(dusername) ~= nil and tostring(dpassword) ~= nil then
                        if npassword == dpassword then
                            if nusername2 ~= nil then
                                if tonumber(balancechange) > 0 and tonumber(balancechange) <= tonumber(getValue(nusername, filename)) then
                                    nv = tonumber(getValue(nusername, filename) - tonumber(balancechange))
                                    nv2 = tonumber(getValue(nusername2, filename) + tonumber(balancechange))
                                    changeValue(nusername, nv, filename)
                                    changeValue(nusername2, nv2, filename)
                                    rednet.send(senderId, tonumber(getValue(nusername, filename)))
                                    gsuccess = true
                                end
                            end
                        end
                    end
                end
            elseif command == "items" then
                rednet.send(senderId, getAllItems(itemlist))
                gsuccess = true
            elseif command == "serverbuyrequest" then
                command, balance, phoneID = threeInputStrip(message)
                if balance ~= nil and phoneID ~= nil then
                    table.insert(orders, {senderId, balance, phoneID})
                    gsuccess = true
                end
            elseif command == "removebuyrequest" then
                command, balance, phoneID = threeInputStrip(message)
                if orders ~= nil then
                    for i, order in ipairs(orders) do
                        if tonumber(id) == tonumber(order[1]) and tonumber(balance) == tonumber(order[2]) and tonumber(phoneID) == tonumber(order[3]) then
                            table.remove(orders, i)
                            gsuccess = true
                        end
                    end
                end
            end
        log(senderId, message, gsuccess)
        if gsuccess == false then
            rednet.send(senderId, "false")
        end
        end
    end
end

-- Main coroutine for the login screen
local function loginCoroutine(filename, whitelist, itemlist)
    while true do
        -- Display login screen
        print("Login Screen")
        print("Enter username:")
        local username = read()
        print("Enter password:")
        local password = read("*")

        -- If login is successful, unlock the screen
        if username == myusername and password == mypassword then
            print("Login successful")
            if main(filename, whitelist, itemlist) then
                break
            end
            shell.run("clear")
        else
            print("Login failed")
        end
    end
end

os.pullEvent = os.pullEventRaw
whitelist = "whitelist.txt"
filename = "clients.txt"
itemlist = "items.txt"
if fs.exists(filename) then
    rednet.open("top")
    parallel.waitForAny(
        function() loginCoroutine(filename, whitelist, itemlist) end,
        function() serverCoroutine(filename, whitelist, itemlist) end
    )
else
    print("No File to Protect")
end