math.randomseed(os.time())
math.random(); math.random(); math.random()

function roll_for_damage(dice, lower, upper, base, is_targeted)
    dN = tonumber(dice)
    bN = tonumber(base)
    message = ""
    total_hits = 0
    print("Player's base is " .. bN)

    -- if a single shot is made check if shot is targeted
    if dN == 1 then
        if is_targeted then
            targeted_shot()
            -- otherwise just return to hit
        else
            to_hit_single = math.random(1, 10)
            if to_hit_single >= bN then
                total_hits = 1
            end
        end
        -- if more than one shot is targeted
        -- for each shot calculate to hit
    else
        for i = 1, dN, 1 do
            to_hit_msg = "Player rolls "
            to_hit = math.random(1, 10)
            to_hit_msg = to_hit_msg .. tostring(to_hit)
            if to_hit >= bN then
                total_hits = total_hits + 1
                to_hit_msg = to_hit_msg .. " and hits"
            else
                to_hit_msg = to_hit_msg .. " and misses"
            end
            print(to_hit_msg)
        end
        -- print(total_hits)

    end
    -- sum all successful hits and calculate damage
    result = ''
    result_sum = 0

    for j = 1, total_hits, 1 do
        n = math.random(lower, upper)
        result = result .. n
        result_sum = result_sum + n
        if j < dN then
            result = result .. ', '
        end
    end
    -- print(result)
    if total_hits == 0 then
        message = message .. "Player misses their shot(s)"
    else
        message = message .. "Player hits " .. total_hits .. " shot(s)"
        .. ", dealing " .. tostring(result_sum) .. " total damage"
    end
    return message
end

function targeted_shot(dice, faces)
    print("targeted shot tbd")
end

function message_output(text)
    is_targeted = false
    if string.find(text, "T") then
        is_targeted = true
    end
    message = string.gsub(text, "(%d+)d%[(%d+)%-(%d+)%]b(%d+)",
        function (dice, upper, lower, base)
            return roll_for_damage(dice, upper, lower, base, is_targeted)
        end
    )
    return message
end

print(message_output("5d[10-22]b7"))