Minecraft Mining Turtle Strip Mine Program [1.12.2]

local tArgs = { ... }

local size = tonumber( tArgs[1] )

local offset = 0
if tArgs[2] then
    offset = tonumber( tArgs[2])
end

local side = 0
if tArgs[3] then
    local pari3 = tonumber( tArgs[3])
    if pari3 == 1 then
        side = 1
    elseif pari3 == 2 then
        side = 2
    else
        side = 0
    end
end

if size < 1 then
    print( "Range of the Tunnel must be positive!" )
    return
end

local function slotsLeft()
    local slotsleft=16
    for slot = 1, 16, 1 do
        if turtle.getItemCount(slot) > 0 then
            slotsleft = slotsleft-1
        end
    end
    return slotsleft
end

local function dropItems()
    for slot = 1, 16, 1 do
        turtle.select(slot)
        turtle.dropDown()
    end
end

local function searchForCoal()
    for slot = 1, 16, 1 do
        local data = turtle.getItemDetail(slot)
        if data then
            if data.name == 'minecraft:coal' then
                return slot
            end
        end
    end
end

if searchForCoal() then
    print(searchForCoal())
end


local blocksMoved=0
local gotbackbcofInv = false
local gotbackbcofFuel= false
local gotbackbcofSize= false

turtle.refuel()
print("Refueled!")
local fuelLevel=turtle.getFuelLevel()
print("FuelLevel: "..fuelLevel)

if turtle.getFuelLevel() < size+offset then
    print("Insufficient FuelLevel!")
    return
end

local ofs = offset + 20

while true do
    while true do
        if offset > 0 then
            for forwardset = 1, offset, 1 do
                if turtle.getFuelLevel() < blocksMoved+ofs then
                    if searchForCoal() then
                        turtle.select(searchForCoal())
                        turtle.refuel()
                    else
                        gotbackbcofFuel = true
                        print("fuel3!!!")
                        break
                    end
                end
                turtle.forward()
            end
            -- If Side = 1 ... right side
            if side==1 then
                turtle.turnRight()
            -- If Side = 2 ... left side (default)
            else
                turtle.turnLeft()
            end
        end
        while true do
            if slotsLeft() < 1 then
                print(slotsLeft())
                gotbackbcofInv = true
                break
            end
            if turtle.detectUp() then
                turtle.digUp()
            elseif turtle.detect() then
                turtle.dig()
                turtle.forward()
                turtle.digUp()
                blocksMoved=blocksMoved+1
                if blocksMoved > size then
                    gotbackbcofSize = true
                    break
                end
                if turtle.getFuelLevel() < blocksMoved+ofs then
                    if searchForCoal() then
                        turtle.select(searchForCoal())
                        turtle.refuel()
                    else
                        gotbackbcofFuel = true
                        print("fuel3!!!")
                        break
                    end
                end
            else
                turtle.forward()
                blocksMoved=blocksMoved+1
                if blocksMoved > size then
                    gotbackbcofSize = true
                    break
                end
                if turtle.getFuelLevel() < blocksMoved+ofs then
                    if searchForCoal() then
                        turtle.select(searchForCoal())
                        turtle.refuel()
                    else
                        gotbackbcofFuel = true
                        print("fuel3!!!")
                        break
                    end
                end
            end
            print(turtle.getFuelLevel())
        end

        -- Initiating the going back
        turtle.turnLeft()
        turtle.turnLeft()

        for moves = 1, blocksMoved, 1 do
            turtle.forward()
        end
        if offset > 0 then
            if side==1 then
                turtle.turnLeft()
            else
                turtle.turnRight()
            end
        end
        for forwardset = 1, offset, 1 do
            turtle.forward()
        end
        dropItems()
        if gotbackbcofSize then
            break
        end
        if gotbackbcofInv then
            break
        end
        if gotbackbcofFuel then
            break
        end
    end
    if gotbackbcofSize then
        break
    end
    if gotbackbcofFuel then
        break
    else
        turtle.turnLeft()
        turtle.turnLeft()
        blocksMoved = 0
    end
end

turtle.turnLeft()
turtle.turnLeft()
turtle.select(1)
print("Mining finished!")