basic strip miner

bedrockDetected = false
d=0
n=0
facingNorth=true
e=0
facingEast=false
s=0
facingSouth=false
w=0
facingWest=false
stripNDone=false
stripEDone=false
stripSDone=false
stripWDone=false
chestDistanceFromHome=0
itemsDelivered = true
while bedrockDetected == false do

    --detecting bedrock
    local success, data = turtle.inspectDown()
    if data.name == "minecraft:bedrock" then
        bedrockDetected = true
    end
--
    --checking fuel level and refueling with coal in inventory
    if turtle.getFuelLevel()<=50 then
        for i = 1, 16 do -- loop through the slots
            turtle.select(i) -- change to the slot
            if turtle.refuel(0) then -- if it's valid fuel
            local halfStack = math.ceil(turtle.getItemCount(i)/2) -- work out half of the amount of fuel in the slot
            turtle.refuel(halfStack) -- consume half the stack as fuel
            end
        end
    end
    if chestDistanceFromHome > 0 and d==0 and itemsDelivered == false then
        for i = 1, chestDistanceFromHome do
            turtle.up()
        end
        for i = 1, 16 do -- loop through the slots
            if turtle.refuel(0) == false then
                turtle.select(i) -- change to the slot
                turtle.drop()
            end
        end
        itemsDelivered=true
    end
    if chestDistanceFromHome > 0 and d==0 and itemsDelivered == true then
        for i = 1, chestDistanceFromHome do
            turtle.down()
        end
        itemsDelivered=false
    end
--
    --digging down and keeping count of depth
    if turtle.detectDown() and d<2 then
        turtle.digDown()
        print("block detected, digging down")
        print("current distance to next strip =", 2-d)
    end
    --moving down and keeping count of depth
    if turtle.detectDown() == false and d<2 then
        chestDistanceFromHome=chestDistanceFromHome+1
        d=d+1
        turtle.down()
        print("block not detected, moving down")
        print("current distance to next strip =", 2-d)
    end
--
    --mining forward
    if turtle.detect() and d==2 and facingNorth ==true and stripNDone==false then
        turtle.dig()
        print("mining forward")
        print("current distance to next strip =", 50-n)
    end
    --moving forward and keeping count of depth
    if turtle.detect() == false and d==2 and facingNorth == true and stripNDone==false then
        turtle.forward()
        n=n+1
        if n==50 then
            stripNDone=true
        end
    end
--
    --going home after finishing strip
    if facingNorth==true and n>=0 and stripNDone == true then
        turtle.back()
        n=n-1
        if n==0 then
        facingNorth=false
        facingEast=true
        turtle.turnRight()
        end
    end
--
    --mining east
    if turtle.detect() and d==2 and facingEast == true and stripEDone==false then
        turtle.dig()
        print("mining east")
        print("current distance to next strip =", 50-e)
    end
    --moving east and keeping count of depth
    if turtle.detect() == false and d==2 and facingEast == true and stripEDone==false then
        turtle.forward()
        e=e+1
        if e==50 then
            stripEDone=true
        end
    end
--
    --going home after finishing strip
    if facingEast==true and e>=0 and stripEDone == true then
        turtle.back()
        e=e-1
        if e==0 then
        facingEast=false
        facingSouth=true
        turtle.turnRight()
        end
    end
--
    --mining south
    if turtle.detect() and d==2 and facingSouth == true and stripSDone==false then
        turtle.dig()
        print("mining south")
        print("current distance to next strip =", 50-s)
    end
    --moving east and keeping count of depth
    if turtle.detect() == false and d==2 and facingSouth == true and stripSDone==false then
        turtle.forward()
        s=s+1
        if s==50 then
            stripSDone=true
        end
    end
--
    --going home after finishing strip
    if facingSouth==true and e>=0 and stripSDone == true then
        turtle.back()
        s=s-1
        if s==0 then
        facingSouth=false
        facingWest=true
        turtle.turnRight()
        end
    end
--
    --mining West
    if turtle.detect() and d==2 and facingWest == true and stripWDone==false then
        turtle.dig()
        print("mining west")
        print("current distance to next strip =", 50-s)
    end
    --moving east and keeping count of depth
    if turtle.detect() == false and d==2 and facingWest == true and stripWDone==false then
        turtle.forward()
        w=w+1
        if w==50 then
            stripWDone=true
        end
    end
--
    --going home after finishing strip
    if facingWest==true and e>=0 and stripWDone == true then
        turtle.back()
        w=w-1
        if w==0 then
        facingWest=false
        facingNorth=true
        turtle.turnRight()
        d=0
        stripNDone=false
        stripEDone=false
        stripSDone=false
        stripWDone=false
        itemsDelivered=false
        end
    end
--
end