config_finished = 'All done master.'
config_refuel = 'I am refueling!'
config_turn_around = 'I am turning 180!'
config_finished_mining = 'I am all done, getting back!'
config_success = 'Starting mining!'

config_block_length = 30

function checkFuel(steps)
    if turtle.getFuelLevel() <= steps - 1 then
        turtle.select(1)
        coalToConsume = turtle.getItemCount(1) - 1
        print(config_refuel)
        turtle.refuel(coalToConsume)
    end --if
end --checkFuel()

function turnAround()
    print(config_turn_around)
    turtle.turnRight()
    turtle.turnRight()
end --turnAround()

function stopMining(steps)
    turnAround()
    print(config_finished_mining)
    for index = 1, steps do
        turtle.forward()
    end --for
    print(config_finished)
end --stopMining()

function mineForward(blockLength)
    for i = 1, blockLength do
        turtle.dig()
        turtle.forward()
    end --for
end

function mineToSide()
    turtle.turnLeft()
    mineForward(15)
    stopMining(15)
    turtle.turnLeft()
end

function miningAlgo(blockLength)
    stepsTaken = 0
    for index = 1, blockLength do
        stepsTaken = stepsTaken + 1
        checkFuel(stepsTaken)
        turtle.forward()
        turtle.dig()

        if stepsTaken >= turtle.getFuelLevel() or stepsTaken + 1 == blockLength then
            stopMining(stepsTaken)
            return true
        end --if

        if index % 3 == 1 and turtle.getFuelLevel() >= 30 then
            mineToSide()
        end --if
    end --for
end

function main()
    miningAlgo(config_block_length)
    print(config_success)
    print('I will mine forward for: ' + config_block_length + ' Blocks!')
end --main

main()