miner

local distance = 0
local direction = 0
local times = 0
local torches = 0
local chest = 0
local itemFuel = 0

local td = 0 -- temp distance for
local gap = 3

local err = 0

local function ioread()
    input = io.read();
    return input
end

local function fuelup()
    need = 0
    repeat
        if turtle.getFuelLevel() == "unlimited" then
            print( "NO NEED FOR FUEL" )
            need = 0
        elseif turtle.getFuelLevel() < 100 then
            turtle.select( 3 )
            turtle.refuel( 1 )
            need = 1
            itemFuel = itemFuel - 1
        elseif need == 1 then
            need = 0
        end
    until need == 0
end

local function precheck()
    if torch == 0 then
        print( "no torches" )
    end

    if chest == 0 then
        print( "no chests" )
        err = 1
    end

    if itemFuel == 0 then
        print( "no fuel" )
        err = 1
    end

    fuelup()
end

local function forward()
    light = 0
    repeat
        if turtle.detect() then
            turtle.dig()
        end

        if turtle.forward() then
            td = td - 1
            light = light + 1
        end

        if turtle.detectUp() then
            turtle.digUp()
        end
        if turtle.detectDown() then
            turtle.digDown()
        end

        --torch placer
        if light == 8 and torches > 0 then
            turtle.select(1)
            turtle.placeDown()
            torches = torches - 1
            light = light - 8
        end

        --chest placer
        if turtle.getItemCount(16) > 0 then
        --todo what if runs out of chest dont just die
            if chest > 0 then
                turtle.select( 2 )
                if turtle.detectDown() then
                    turtle.digDown()
                end
                turtle.placeDown()
                chest = chest - 1
                for slot = 4, 16 do
                    turtle.select( slot )
                    turtle.dropDown()
                    sleep( 1.5 )
                end
                turtle.select( 4 )
            else
                print( "no chests refuel into slot 2" )
                os.shutdown()
            end
        end
        fuelup()
    until td == 0
end

local function back()
    turtle.turnLeft()
    turtle.turnLeft()
    d = distance
    repeat
        if turtle.forward() then
            d = d - 1
        end
        if turtle.detect() then
            if d ~= 0 then
                turtle.dig()
            end
        end
    until d == 0
    if direction == 1 then
        turtle.turnLeft()
    else
        turtle.turnRight()
    end
end

local function prepare()
    x = gap
    repeat
        if turtle.detect() then
            turtle.dig()
        end

        if turtle.forward() then
            x = x - 1
        end

        if turtle.detectUp() then
            turtle.digUp()
        end
        if turtle.detectDown() then
            turtle.digDown()
        end
    until x == 0
    if direction == 1 then
        turtle.turnLeft()
    else
        turtle.turnRight()
    end
    if times == 0 then
        print( "turtle is done" )
    else
        times = times - 1
    end
end


local function mine()
    td = distance
    repeat
        forward()

        back()

        prepare()
        td = distance
    until times == 0
end


--start the program
torches = turtle.getItemCount( 1 )
chest = turtle.getItemCount( 2 )
itemFuel = turtle.getItemCount( 3 )
print( "strip miner")
print( "enter distance" )
distance = tonumber( ioread() )

print( "what direction left=0 or right=1" )
direction = tonumber( ioread() )

print( "how many times" );
times = tonumber( ioread() );

precheck()
if Error == 1 then
    print( "failed to start" )
else
    mine()
end