local locked = true

while locked == true do
    term.clear()
    term.setCursorPos(1, 1)
    term.setCursorBlink(true)
    textutils.slowWrite("Welcome Lucas... \nPassword: ")
    local ePass = read("*")
    term.clear()
    term.setCursorPos(1, 1)

    if ePass == "pass" then
        locked = false
        textutils.slowPrint("Correct!")

        -- Initializing --
        local rowsMined = {0}

        local totalRows = {0}

        local hallLength = {0}

        local fuelNeeded = {0}

        local fuelLevel = turtle.getFuelLevel()
        local fuelLimit = turtle.getFuelLimit()
        local startConfirmed = "No"
        local slot = turtle.getSelectedSlot()
        local itemSpace = turtle.getItemSpace()
        local torchCounter = 0

        -- Declaring Functions --
        -- Help from the user Foogles (http://www.computercraft.info/forums2/index.php?/user/46239-foogles/) -- THANK YOU FOR THIS BUG SOLUTION ;)
        function forward()
            local x = turtle.forward()
            if (x == false) then return forward() end
        end

        local function clear(column, row)
            term.clear()

            if column == nil and row == nil then
                column = 1
                row = 1
            elseif row == nil then
                row = 1
            elseif column == nil then
                column = 1
            end

            term.setCursorPos(column, row)
        end

        local function checkNumber(varToCheck)
            assert(type(varToCheck) == "number", "Program expected number. Got string or something else instead.")
        end

        local function fallingBlock()
            local success, data = turtle.inspect()

            local fBlocks = {
                sand = "minecraft:sand",
                gravel = "minecraft:gravel",
                anvil = "minecraft:anvil",
                dragon_egg = "minecraft:dragon_egg"
            }

            if data.name == fBlocks.sand or data.name == fBlocks.gravel or data.name == fBlocks.anvil or data.name == fBlocks.dragon_egg then
                return true
            else
                return false
            end
        end

        local function dig(length, back)
            for i = 1, length do
                torchCounter = torchCounter + 1

                while fallingBlock() == true do
                    turtle.dig()
                    sleep(1)
                end

                turtle.dig()
                forward()
                turtle.digDown()

                if torchCounter >= 8 then
                    turtle.select(16)

                    if turtle.getItemSpace() < 64 then
                        local data = turtle.getItemDetail()

                        if data.name == "minecraft:torch" then
                            turtle.placeDown()
                        end
                    end

                    torchCounter = 0
                    turtle.select(1)
                end
            end

            if back == true then
                turtle.turnLeft()
                turtle.turnLeft()

                for i = 2, length do
                    forward()
                end

                forward()
                turtle.turnLeft()
                turtle.turnLeft()
            end
        end

        -- Welcome Message + Input --
        clear(1, 1)
        print("Welcome to the Strip Mining Program. by twisttaan")
        sleep(1)
        print("Please enter a Hall/Strip Length (x = x block/s): ")
        hallLength[1] = io.read()
        hallLength[1] = tonumber(hallLength[1])
        checkNumber(hallLength[1])
        print("Please enter a number of rows:")
        totalRows[1] = io.read()
        totalRows[1] = tonumber(totalRows[1])
        checkNumber(totalRows[1])
        print("Calculating if turtle has enough fuel...")
        fuelNeeded[1] = (hallLength[1] * 3 * totalRows[1]) + (12 * totalRows[1])
        sleep(1.0)
        assert(fuelNeeded[1] < fuelLimit, "Your fuel Limit is too low. Try an advanced turtle.")
        assert(fuelNeeded[1] < fuelLevel, "Your turtle hasn't enought fuel.")
        print("Your turtle has enough fuel. Please place a chest behind the turtle.")
        sleep(2.0)
        clear(1, 1)
        print("Place a chest behind the turtle.")
        print("Place Torches to place in Slot 16 (Bottom right hand corner)")
        write("Press any key to start the program.")
        local skip = io.read()
        -- Post initialization --
        local rowsToMine = totalRows[1] - rowsMined[1]
        clear(1, 1)
        turtle.select(1)

        -- Main Loop --
        for i = 1, totalRows[1] do
            turtle.select(1)
            dig(3, false)
            turtle.turnLeft()
            dig(hallLength[1], true)
            rowsMined[1] = rowsMined[1] + 1
            clear(1, 1)
            print("Rows Mined: ", rowsMined[1])
            local z = 1
            turtle.select(15)

            if turtle.getItemSpace() < 64 then
                turtle.turnLeft()

                for i = 1, rowsMined[1] * 3 + 1 do
                    forward()
                end

                for i = 1, 15 do
                    turtle.select(z)
                    z = z + 1
                    turtle.drop(64)
                end

                turtle.turnRight()
                turtle.turnRight()

                for i = 1, rowsMined[1] * 3 + 1 do
                    forward()
                end

                turtle.turnLeft()
            end

            turtle.turnRight()
            rowsToMine = totalRows[1] - rowsMined[1]
        end

        -- Ending --
        do
            print("Putting Items into chest.")
            turtle.turnLeft()
            turtle.turnLeft()

            for i = 1, (rowsMined[1] * 3) + 1 do
                forward()
            end

            z = 1

            for i = 1, 16 do
                turtle.select(z)
                z = z + 1
                turtle.drop(64)
            end
        end

        turtle.select(1)
        print("Mining Complete.")
        sleep(2)
        clear(1, 1)
    end
end

return textutils.slowPrint("Go away willlly"), (1), os.shutdown(), (2) -- Most likely Willy