-- Mining Turtle Program for Gravel/Andesite
-- Version 1.1.1 for CC: Tweaked 1.21.1
-- SemVer: MAJOR.MINOR.PATCH

--[[ Changelog:
v1.1.1 - Fixed fuel system to scan all slots for fuel
v1.1.0 - Added proper SemVer version tracking and display
v1.0.0 - Initial release with basic mining functionality
]]

-- Configuration
local VERSION = "1.1.1"
local START_POS = vector.new(-279, 64, -182)
local MAX_Y = 70
local MIN_FUEL = 100
local PREFERRED_FUEL_SLOT = 16 -- Preferred slot for fuel, but will search all slots

-- Block types to mine
local TARGET_BLOCKS = {
    ["minecraft:gravel"] = true,
    ["minecraft:andesite"] = true,
    ["minecraft:diorite"] = true,
    ["minecraft:granite"] = true
}

-- Turtle state
local pos = vector.new(START_POS.x, START_POS.y, START_POS.z)
local facing = "north" -- Initial facing direction
local visited = {} -- Track visited positions to prevent infinite loops

-- Direction vectors
local directions = {
    north = vector.new(0, 0, -1),
    east = vector.new(1, 0, 0),
    south = vector.new(0, 0, 1),
    west = vector.new(-1, 0, 0)
}

-- Helper functions
local function log(message)
    print(os.date("[%H:%M:%S] ") .. message)
end

local function printVersion()
    term.clear()
    term.setCursorPos(1,1)
    print("==== Mining Turtle Program ====")
    print("Version: " .. VERSION)
    print("CC: Tweaked 1.21.1")
    print("==============================")
    print()
end

local function findFuel()
    -- First try preferred slot
    turtle.select(PREFERRED_FUEL_SLOT)
    if turtle.refuel(0) then -- Test if item is fuel
        return PREFERRED_FUEL_SLOT
    end

    -- Search all slots for fuel
    for slot = 1, 16 do
        if slot ~= PREFERRED_FUEL_SLOT then -- Skip already checked preferred slot
            turtle.select(slot)
            if turtle.refuel(0) then
                return slot
            end
        end
    end

    return nil -- No fuel found
end

local function checkFuel()
    if turtle.getFuelLevel() >= MIN_FUEL then
        return true
    end

    log("Low fuel! Searching for fuel...")
    local fuelSlot = findFuel()

    if fuelSlot then
        turtle.select(fuelSlot)
        local before = turtle.getFuelLevel()
        if turtle.refuel(1) then
            local gained = turtle.getFuelLevel() - before
            log(("Refueled with slot %d (+%d fuel). Total: %d"):format(fuelSlot, gained, turtle.getFuelLevel()))
            return true
        end
    end

    log("No fuel found in any slot!")
    return false
end

-- ... [rest of the functions remain the same as in v1.1.0] ...

-- Main program
printVersion()
log("Starting mining turtle at position " .. pos.x .. " " .. pos.y .. " " .. pos.z)
log("Target blocks: gravel, andesite, diorite, granite")
log("Max Y level: " .. MAX_Y)

-- Initial fuel check
if not checkFuel() then
    log("Initial fuel level too low and no fuel found!")
    log("Please add fuel (coal, lava buckets, etc.) to any slot")
    return
end

-- Start mining
explore()

log("Mining operation complete!")
log("Final position: " .. pos.x .. " " .. pos.y .. " " .. pos.z)
log("Remaining fuel: " .. turtle.getFuelLevel())