Turtle Farm 5 (Final)

local x,y = 0,0
local direction = "north"

local success, idtable = turtle.inspectDown()

if success and idtable.name == "minecraft:chest" then
    print("Success")
else
    error("Need chest below turtle to start farming!")
end

function testForAvailableFuel()
    for i = 1, 16 do
        turtle.select(i)
        if turtle.refuel(0) then
            return true
        end
    end
    return false
end

function fuel()
    local fLimit = turtle.getFuelLimit()
    local fCurr = turtle.getFuelLevel()
    local fSucc = testForAvailableFuel()
    if fCurr <= math.floor(fLimit/2) and fSucc == true then
        for i = 1, 16 do
            turtle.select(i)
            if turtle.refuel(0) then
                local halfStack = math.floor(turtle.getItemCount(i)/2)
                turtle.refuel(halfStack)
            end
        end
    end
end

function forward(dirToGo)
    if dirToGo == "north" then
        y = y + 1
        if direction == "north" then
            turtle.forward()
        elseif direction == "south" then
            turtle.turnLeft()
            turtle.turnLeft()
            turtle.forward()
        elseif direction == "west" then
            turtle.turnRight()
            turtle.forward()
        elseif direction == "east" then
            turtle.turnLeft()
            turtle.forward()
        end
        direction = "north"
    elseif dirToGo == "east" then
        x = x + 1
        if direction == "north" then
            turtle.turnRight()
            turtle.forward()
        elseif direction == "west" then
            turtle.turnLeft()
            turtle.turnLeft()
            turtle.forward()
        elseif direction == "east" then
            turtle.forward()
        elseif direction == "south" then
            turtle.turnLeft()
            turtle.forward()
        end
        direction = "east"
    elseif dirToGo == "south" then
        y = y - 1
        if direction == "south" then
            turtle.forward()
        elseif direction == "north" then
            turtle.turnLeft()
            turtle.turnLeft()
            turtle.forward()
        elseif direction == "east" then
            turtle.turnRight()
            turtle.forward()
        elseif direction == "west" then
            turtle.turnLeft()
            turtle.forward()
        end
        direction = "south"
    elseif dirToGo == "west" then
        x = x - 1
        if direction == "west" then
            turtle.forward()
        elseif direction == "east" then
            turtle.turnLeft()
            turtle.turnLeft()
            turtle.forward()
        elseif direction == "south" then
            turtle.turnRight()
            turtle.forward()
        elseif direction == "north" then
            turtle.turnLeft()
            turtle.forward()
        end
        direction = "west"
    end
    fuel()
end

function moveTo(x2, y2)
    if x2 > x then
        local x3 = x2 - x
        for f = 1, x3 do
            forward("east")
        end
    elseif x2 < x then
        local x3 = (math.abs(x2)) - x
        for f = 1, x3 do
            forward("west")
        end
    end
    if y2 > y then
        local y3 = y2 - y
        for g = 1, y3 do
            forward("north")
        end
    elseif y2 < y then
        local y3 = (math.abs(y2)) - y
        for g = 1, y3 do
            forward("south")
        end
    end
end

function dropOff()
    moveTo(0,0)
    for i = 1, 16 do
        turtle.select(i)
        turtle.dropDown()
    end
    turtle.suckDown()
end

function findSeeds()
    for i = 1, 16 do
        turtle.select(i)
        local idtable = turtle.getItemDetail()
        if idtable.name == "minecraft:wheat_seeds" then
            return i
        end
    end
end

function harvestGrownAndPlant()
    local success, idtable = turtle.inspectDown()
    if success then
        if idtable.name == "minecraft:wheat" then
            if idtable.state.age == 7 then
                local seeds = findSeeds()
                turtle.digDown()
                turtle.select(seeds)
                turtle.placeDown()
            end
        end
    end
    local seeds = findSeeds()
    turtle.select(seeds)
    turtle.placeDown()
end

function harvestAll()
    for k = 0, 27 do
        for p = 1, 28 do
            moveTo(k, p)
            harvestGrownAndPlant()
        end
    end
    moveTo(0,0)
end

while true do
    dropOff()
    harvestAll()
    sleep(600)
end