#!/usr/bin/lua
-- See https://adventofcode.com/2025/day/3

local DEBUG = false

function debug(msg)
	if DEBUG then
		print(msg)
	end
end

function MaxJolt(Battery, Size)
	-- TODO - This going to be a rework, I need to loop 12 times
	local BatteryDigits = {}
	for I = 1, tonumber(Size) do
		BatteryDigits[I] = 0
	end

	-- lastdigit = tonumber(string.sub(Battery, -1))
	-- debug("lastdigit " .. lastdigit)
	--
	-- BatteryNoLast = string.sub(Battery, 0, -2)
	-- BatteryNoLast:gsub(".", function(c)
	-- 	table.insert(b, c)
	-- 	return c
	-- end)
	--
	-- for key, value in pairs(b) do
	-- 	checkdigit = tonumber(value)
	-- 	if firstdigit < checkdigit then
	-- 		firstdigit = checkdigit
	-- 	end
	-- end
	--
	-- local passedfirst = false
	-- for key, value in pairs(b) do
	-- 	checkdigit = tonumber(value)
	-- 	if passedfirst and seconddigit < checkdigit then
	-- 		seconddigit = checkdigit
	-- 	end
	-- 	if checkdigit == firstdigit then
	-- 		passedfirst = true
	-- 	end
	-- end
	--
	-- if seconddigit < lastdigit then
	-- 	seconddigit = lastdigit
	-- end
	--
	-- debug("First " .. firstdigit)
	-- debug("Second " .. seconddigit)
	-- return tostring(firstdigit) .. tostring(seconddigit)
	local BatteryString = ""
	for I = 1, tonumber(Size) do
		BatteryString = BatteryString .. tostring(BatteryDigits[I])
	end
	return BatteryString
end

function TestMaxJolt(Battery, Test, Size)
	local MJ = MaxJolt(Battery, Size)
	if MJ == Test then
		print("WIN  - " .. Battery .. " " .. MJ .. " == " .. Test)
	else
		print("FAIL - " .. Battery .. " " .. MJ .. " != " .. Test)
	end
end

print("# Self Test")
TestMaxJolt("987654321111111", "987654321111", 12)
TestMaxJolt("811111111111119", "811111111119", 12)
TestMaxJolt("234234234234278", "434234234278", 12)
TestMaxJolt("818181911112111", "888911112111", 12)

print("# Calculate MaxJolt")
local TotalJolt = 0

for battery_line in io.lines("full_input") do
	TotalJolt = TotalJolt + MaxJolt(battery_line)
end
print("Total " .. TotalJolt)