--Variables
monitorSide = "right"
redstoneSide = "left"
mon = peripheral.wrap(monitorSide)

tButtons = {
        { text = "Redstone ON", x = 1, y = 1, col = colours.lime },
        { text = "Redstone OFF", x = 1, y = 1, col = colours.red }
}

local function isValidClick( tab, mx, my )
        for _, v in pairs( tab ) do
                if mx >= v.x and mx <= v.x + #v.text - 1 -- verifies the X position
                and my == v.y then -- Y position
                        return true, v.text -- valid click so it returns true and what text was clicked
                end
        end
        return false, nil -- If the button is invalid, return false and nil
end

local function printTable( tab ) -- Function to print any table
        print("Printing the options for table onto the monitor...")
        for _, v in pairs( tab ) do
                term.setCursorPos( v.x, v.y )
                term.setBackgroundColour( v.col )
                mon.write( v.text )
        end
end

printTable( tButtons )

while true do
        local event, but, X, Y = os.pullEvent()
        if event == "monitor_touch" then
                bValidClick, sText = isValidClick( tButtons, X, Y ) -- calls the function to check if it's a valid click
                if bValidClick then -- if it's a valid click
                        if sText == "Redstone ON" then -- if the text returned is 'Redstone ON'
                                redstone.setOutput( "back", true )
                                print( "Redstone signal has been turned ON" )
                        elseif sText == "Redstone OFF" -- if the text returned is 'Redstone OFF'
                                redstone.setOutput( "back", false )
                                print( "Redstone signal has been turned OFF" )
                        end
                end
        end
end