Turtle mining lua

local numSlots = 16
local HDG = "north"
local width, depth, height = 5, 5, 2


if(#arg == 3) then
    width = tonumber(arg[1])
    depth = tonumber(arg[2])
    height = tonumber(arg[3])
else
    print("Digging 5x5x2")
end


Dropped_Items = {
    "minecraft:stone",
    "minecraft:dirt",
    "minecraft:gravel",
    "minecraft:flint",
    "minecraft:sand",
    "minecraft:cobblestone",
    "minecraft:redstone",
    "minecraft:dye",
    "thaumcraft:nugget",
    "thaumcraft:crystal_essence",
    "thaumcraft:ore_cinnabar",
    "thermalfoundation:material",
    "railcraft:ore_metal",
    "extrautils2:ingredients",
    "projectred-core:resource_item",
    "deepresonance:resonating_ore",
    "forestry:apatite"
}


-- Function for dropping unwanted items

function dropItems()
    for slot = 1, numSlots, 1 do
        local item = turtle.getItemDetail(slot)
        if(item ~= nil) then
            for droppedItemsIndex = 1, #Dropped_Items, 1 do
                if(item["name"] == Dropped_Items[droppedItemsIndex]) then
                    turtle.select(item)
                    turtle.dropDown()
                end
            end
        end
    end
end


--Function to find ender chest in the inventory

function getEnderSlot()
    for slot = 1, numSlots, 1 do
        local item = turtle.getItemDetail(slot)
        if(item ~= nil) then
            if(item["name"] == "enderstorage:ender_storage") then
                return slot
            end
        end
    end
    return nil
end


--Function to drop items after each row

function manageInventory()
    dropItems()
    enderSlot = getEnderSlot()
    if(enderSlot ~= nil) then
       turtle.select(enderSlot)
        turtle.digUp()
        turtle.placeUp()
    end
--Ender chest has been placed
    for slot = 1, numSlots, 1 do
        local item = turtle.getItemDetail(slot)
        if(item ~= nil) then
            if(item["name"] ~= "minecraft:coal_block" and item["name"] ~= "minecraft:coal" and item["name"] ~= "enderstorage:ender_storage") then
                turtle.select(slot)
                turtle.dropUp()
            end
        end
    end
--Wanted items have been stored
    turtle.digUp()
end


--Checks fuel level
function checkFuel()
    turtle.select(1)
    if(turtle.getFuelLevel() < 50) then
        print("Attempting to refuel")
        for slot = 1, numSlots, 1 do
            turtle.select(slot)
            if(turtle.refuel(1)) then
                return true
            end
        end
    return false
    else
        return true
    end
end


function detectDig()
    while(turtle.detectUp() or turtle.detectDown() or turtle.detect()) do
        turtle.dig()
        turtle.digUp()
        turtle.digDown()
    end
end


function forward()
    detectDig()
    turtle.forward()
end


function leftHalfTurn()
    turtle.turnLeft()
    detectAndDig()
    turtle.forward()
    turtle.turnLeft()
    detectAndDig()
end


function rightHalfTurn()
    turtle.turnRight()
    detectAndDig()
    turtle.forward()
    turtle.turnRight()
    detectAndDig()
end


function flipDirection()
    if(HDG == "north") then
        HDG = "south"
    elseif(HDG == "south") then
        HDG = "north"
    elseif(HDG == "west") then
        HDG = "east"
    elseif(HDG == "east") then
        HDG = "west"
    end
end


function turnAround(level)
    if(level % 2 == 1) then
        if(HDG == "north" or HDG == "west") then
            leftHalfTurn()
        elseif(HDG == "south" or HDG == "east") then
            rightHalfTurn()
        end
    else
        if(HDG == "north" or HDG == "west") then
            rightHalfTurn()
        elseif(HDG == "south" or HDG == "east") then
            leftHalfTurn()
        end
    end
    flipDirection()
end


function upLevelX3()
    turtle.turnRight()
    turtle.turnRight()
    flipDirection()
    turtle.digUp()
    turtle.up()
    turtle.digUp()
    turtle.up()
    turtle.digUp()
    turtle.up()
end


function main()
    for level = 1, height, 1 do
        for X = 1, width, 1 do
            for Y = 1, depth, 1 do
                if(not checkFuel()) then
                    print("Turtle is out of fuel.")
                    return
                end
                forward()
                print(string.format("X: %d      Y: %d", X, Y))
            end
            if(X ~= width) then
                turnAround(level)
            end
            manageInventory()
        end
        upLevelX3()
    end
end


main()