Turtle Quarry

local relX = 0 --relative position from home
local relY = 0 --relative position from home
local relZ = 1 --relative position from home
local curDir = 0 --Current Direction the turtle is facing relative to home chest
local sizeX = 1 --Size of Quarry
local sizeY = 1 --Size of Quarry
local sizeZ = 1 --Size of Quarry
local atHome = true --is the turtle at home
local swap = false --is the turtle minging left to right or right to left
local digTimeout = 16
local curHits = 0
local hasStarted = false
local isGoingHome = false
local hasCompleted = false
local hitSomething = false
local tArgs = {...}
function Start() --initalize
    if #tArgs < 1 then
        print("Define Quarry Size")
        write("X: ")
        sizeX = tonumber(read())
        write("Z: ")
        sizeZ = tonumber(read())
        write("Y: ")
        sizeY = tonumber(read())
    else
        sizeX = tonumber(tArgs[1])
        sizeZ = tonumber(tArgs[2])
        sizeY = tonumber(tArgs[3])
    end
    print("Starting...")
    CheckFuel()
    Turn("right", 2)
    Move("forward", 1)
    Move("down", 2)
    turtle.digDown()
    hasStarted = true
    atHome = false
    while hasCompleted == false do
        Dig(1,1,1, sizeX, sizeY, sizeZ)
        if isGoingHome == true then
            GoHome()
        end
    end
    --print("Done!")
end
function Dig(curX, curY, curZ, curSizeX, curSizeY, curSizeZ) --digging control
    for i=tonumber(curY), curSizeY, 1 do
        for i=tonumber(curX), curSizeX, 1 do
            for i = tonumber(curZ), curSizeZ-1, 1 do
                --print("moving in Z, ".. curDir.." i: "..i)
                CheckStatus()
                Move("forward", 1)
                turtle.digDown()
                if not i == sizeZ then
                    turtle.dig()
                end
                turtle.digUp()
                if curDir == 0 then
                    relZ = relZ -1
                elseif curDir == 2 then
                    relZ = relZ +1
                end
                --os.sleep(1)
            end
            if i < sizeX then
                if swap then
                    --print("moving right")
                    if curDir == 2 then
                        Turn("right", 1)
                        Move("forward", 1)
                        Turn("right", 1)
                    elseif curDir == 0 then
                        Turn("left", 1)
                        Move("forward", 1)
                        Turn("left", 1)
                    end
                    relX = relX -1
                elseif not swap then
                    --print("moving left")
                    if curDir == 0 then
                        Turn("right", 1)
                        Move("forward", 1)
                        Turn("right", 1)
                    elseif curDir == 2 then
                        Turn("left", 1)
                        Move("forward", 1)
                        Turn("left", 1)
                    end
                    relX = relX +1
                end
                turtle.digDown()
                turtle.dig()
                turtle.digUp()
            elseif i == sizeX then
                if swap == true then
                    Turn("right",2)
                elseif swap == false then
                    Turn("left",2)
                end
            end
            --print("moving in X, ".. curDir.." i: "..i)
            --os.sleep(1)
        end
        CheckFuel()
        if i < sizeY then
            Move("down", 3)
            turtle.digDown()
            swap = not swap
            --print("swap stat: "..tostring(swap))
            --print("moving in Y, ".. curDir.." i: "..i)
            --os.sleep(1)
        end
        if hitSomething == true then
            isGoingHome = true
            hasStarted = false
            hasCompleted = true
            break
        end
        if i >= sizeY then
            isGoingHome = true
            hasStarted = false
            hasCompleted = true
            break
        end
    end
end
function CheckStatus() -- check if inventory is full
    if turtle.getItemCount(14) > 0 then
        Deposit()
    end
end
function GoHome() --sends the turtle home
    print("Going Home...")
    print(relX .. ","..relY..","..relZ .."Dir: "..curDir)
    Move("up", math.abs(relY))
    if curDir == 2 then
        Turn("left",2)
    end
    if relX < 0 then
        Turn("right", 1)
    end
    if relX > 0 then
        Turn("left", 1)
    end
    Move("forward", math.abs(relX))
    if curDir == 1 then
        Turn("left",1)
    end
    if curDir == 2 then
        Turn("left",2)
    end
    if curDir == 3 then
        Turn("right",1)
    end
    Move("forward", math.abs(relZ))
    print("Got Home")
    atHome = true
    CheckFuel()
    Deposit()
end
function CheckFuel() -- checks the fuel level, refuels and gets more is the turtle is at home
    print("Refueling...")
    turtle.select(16)
    if atHome == true then
        if turtle.getItemCount(16) <= 1 then
            GetFuel()
        end
    end
    turtle.select(16)

    while turtle.getFuelLevel() <= 1000 do
        turtle.refuel(2)
        if turtle.getItemCount(16) <= 1 then
            print("Out of Fuel")
            break
        end
    end
    turtle.select(1)
    print("Fuel Level: ".. turtle.getFuelLevel());
end
function GetFuel() -- gets more fuel
    print("Getting More Fuel...")
    while turtle.getItemCount(16) < 64 do
        turtle.suck(1)
    end
    --Deposit()
end
function Deposit() -- deposits items
    print("Depositing Items...");
    turtle.digUp()
    turtle.select(15)
    turtle.placeUp() --places Enderchest
    for i=1, 14, 1 do
        turtle.select(i)
        turtle.dropUp()
    end
    turtle.select(15)
    turtle.digUp()
    turtle.select(1)
end
function Turn(dir, count) --turn controller to keep track of direction
    if dir == "left" then
        for i=1, count, 1 do
            --print("turing Left, cur Dir: "..curDir )
            turtle.turnLeft()
            curDir = curDir - 1
            if curDir < 0 then
                curDir = 3
            end
            --print("turned Left, new Dir: "..curDir )
            --print("left, current Dir: "..curDir)
        end
    end
    if dir == "right" then
        for i=1, count, 1 do
            --print("turning Right, cur Dir: "..curDir )
            turtle.turnRight()
            curDir = curDir + 1
            if curDir > 3 then
                curDir = 0
            end
            --print("turned right, new Dir: "..curDir )
            --print("right, current Dir: "..curDir)
        end
    end
end
function Move(dir, dist) --move controller to insure propper movement and keep track of relative position
    print("Moving".. dir..":".. dist)
    if dir == "forward" then
        for i=1, dist, 1 do
            while not turtle.forward() do
                CheckFuel()
                if turtle.detect() then
                    turtle.dig()
                else
                    turtle.attack()
                    print("Attacking Front");
                end
                --turtle.forward()
                --break
            end
            --if curDir == 0 then
                --relZ = relZ - 1
            --end
            --if curDir == 2 then
                --relZ = relZ + 1
            --end
            --if curDir == 1 then
                --relZ = relX + 1
            --end
            --if curDir == 3 then
                --relZ = relX - 1
            --end
        end
    end
    if dir == "up" then
        for i=1, dist, 1 do
            --print("Moving up...")
            while turtle.up() == false do
                CheckFuel()
                if turtle.detectUp() then
                    turtle.digUp()
                else
                    turtle.attackUp()
                    print("Attacking Top")
                end
                --turtle.up()
                --break
            end
            relY = relY + 1
        end
    end
    if dir == "down" then
        for i=1, dist, 1 do
            while not turtle.down() do
                CheckFuel()
                if turtle.detectDown() then
                    turtle.digDown()
                else
                    turtle.attackDown()
                end
                --turtle.down()
                --break
                curHits = curHits + 1
                if curHits >= digTimeout then
                    hitSomething = true
                    print("unable to proceed...")
                    break
                end
            end
            if hitSomething == false then
                relY = relY - 1
                curHits = 0
            end
        end
    end
end
Start() --Calls Start
if hitSomething == true then
    print("Hit Something I can't break!")
end
print("Done!")