height = 16
width = 14
pos = {}
pos.x = 1
pos.y = 0

endp = {}
endp.x = width
move = "+"

if (width % 2 == 0) then
    endp.y = 1
    direction = "toward"
else
    endp.y = height
    direction = "away"
end

function restock (turtle)
    turtle.turnRight()
    local i = 2

    while (i <= 16) do
        turtle.select(i)
        turtle.drop()
    end

    turtle.turnRight()
    -- ADD Refuel from bottom if needed
end

function forwardCheck (turtle, pos)
    turtle.forward()

    if (move == "+") then
        pos.y = pos.y + 1
    else
        pos.y = pos.y - 1
    end

    local suc, crop = turtle.inspectDown()
    if (crop.name == 'minecraft:wheat' and crop.metadata == 7) then
        turtle.digDown()
        turtle.select(1)
        turtle.placeDown()
    end
end

function leftTurnCheck (turtle, pos)
    turtle.turnLeft()
    turtle.forward()
    pos.x = pos.x + 1
    turtle.turnLeft()
    move = "-"

    local suc, crop = turtle.inspectDown()
    if (crop.name == 'minecraft:wheat' and crop.metadata == 7) then
        turtle.digDown()
        turtle.select(1)
        turtle.placeDown()
    end
end

function rightTurnCheck (turtle, pos)
    turtle.turnRight()
    turtle.forward()
    pos.x = pos.x + 1
    turtle.turnRight()
    move = "+"

    local suc, crop = turtle.inspectDown()
    if (crop.name == 'minecraft:wheat' and crop.metadata == 7) then
        turtle.digDown()
        turtle.select(1)
        turtle.placeDown()
    end
end

while true do
    print('end-x: ', endp.x, ' end-y: ', endp.y)
    print('x: ', pos.x, ' y: ', pos.y)
    if (pos.x == endp.x and pos.y == endp.y) then
        if (direction == "away") then
            turtle.turnLeft()
            turtle.turnLeft()
        end

        while (pos.y > 1) do
            turtle.forward()
            pos.y = pos.y - 1
        end

        turtle.turnLeft()

        while (pos.x > 1) do
            turtle.forward()
            pos.x = pos.x - 1
        end

        turtle.turnRight()
        turtle.forward()
        pos.y = pos.y - 1
        turtle.turnLeft()
        turtle.turnLeft()

        restock(turtle)
        print('x: ', pos.x, ' y: ', pos.y)

        sleep(5)
    else
        if (pos.x == 1 and pos.y == 0) then
            forwardCheck(turtle, pos)
            forwardCheck(turtle, pos)
            forwardCheck(turtle, pos)
        elseif (pos.y == 1) then
            rightTurnCheck(turtle, pos)
            forwardCheck(turtle, pos)
        elseif (pos.y == height) then
            leftTurnCheck(turtle, pos)
            forwardCheck(turtle, pos)
        else
            forwardCheck(turtle, pos)
        end
    end
end