aph

local target = -1
if(arg[4] == nil) then
    print("not enough arg")
    return
end


local length = tonumber(arg[1])
local weight = tonumber(arg[2])
local pMode = nil
local orient = "RIGHT"


local turntFlag = false
if(arg[4] == "l") then
    orient = "LEFT"
    turntFlag = true
elseif (arg[4] == "r") then
    orient = "RIGHT"
else
    print("not valid orient!")
    return
end

if(arg[3] == "ver") then
    pMode = "VER"
    turntFlag = false
elseif (arg[3] == "hor") then
    pMode = "HOR"
else
    print("not valid mode!")
    return
end

print("input confirm to start work");
if(io.read() ~= "confirm" ) then
    print("u not confirm!")
    return
end

print("start work!")
local emptyFlag =false
local bkslot = 2

local function turtleSelfCheck()
    -- check fuel
    if(turtle.getFuelLevel() < 100) then
        turtle.select(1)
        turtle.refuel(1)
    end
    -- check space
    turtle.select(bkslot)
    if(emptyFlag == false) then
        while (turtle.getItemCount() == 0) do
            bkslot = bkslot + 1
            if(turtle.getItemCount(2) ~= 0) then
                bkslot = 2
                break
            end
            if(bkslot > 16) then
                os.shutdown()
            end
            turtle.select(bkslot)
        end
    end

end


local function turtleMove(edgeFlag)
    if(pMode == "HOR") then
        if(edgeFlag) then
            if(turntFlag == false) then
                turtle.turnRight()
                turtle.forward()
                turtle.turnRight()
            else
                turtle.turnLeft()
                turtle.forward()
                turtle.turnLeft()
            end
            turntFlag = not turntFlag
        else
            turtle.forward()
        end
    elseif (pMode == "VER") then
        if(turntFlag == false) then
            if(edgeFlag) then
                if(orient == "RIGHT") then
                    turtle.turnRight()
                    turtle.forward()
                    turtle.turnLeft()
                    turntFlag = not turntFlag
                else
                    turtle.turnLeft()
                    turtle.forward()
                    turtle.turnRight()
                    turntFlag = not turntFlag
                end
            else
                turtle.up()
            end
        else
            if(edgeFlag) then
                if(orient == "RIGHT") then
                    turtle.turnRight()
                    turtle.forward()
                    turtle.turnLeft()
                    turntFlag = not turntFlag
                else
                    turtle.turnLeft()
                    turtle.forward()
                    turtle.turnRight()
                    turntFlag = not turntFlag
                end
            else
                turtle.down()
            end
        end
    end
end

local function turnCheck()
    if(orient == "RIGHT") then
        turtle.turnRight()
        turtle.forward()
        turtle.turnLeft()
    else
        turtle.turnLeft()
        turtle.forward()
        turtle.turnRight()
    end
end

local eFlag = false
while (length>0) do
local count = 0
    while true do
        -- self check
        turtleSelfCheck()
        -- place
        if(pMode == "HOR") then
            turtle.placeDown()
        elseif(pMode == "VER") then
            turtle.place()
        end
        turtle.forward()
            -- move
        if(turtle.detectDown()) then
            turnCheck()
            turntFlag = not turntFlag
            break
        else
        end

        count = count + 1
        --
    end
    while (count > target) do
        turtleSelfCheck()

        turtle.back()
        turtle.placeDown()
        count = count -1
    end
    turnCheck()
    turntFlag = not turntFlag
    length = length - 1
end