--Initialize variables
local xParkLocation = -1
local xCoord = xParkLocation
local yParkLocation = 0
local yCoord = yParkLocation
local xMinCoord = 0
local xMaxCoord = 5
local yMinCoord = 0
local yMaxCoord = 28
local xStart = xMinCoord --Set the starting X location equal to the min X coordinate
local xLimit = xMaxCoord --Sets the ending X location equal to the max X coordinate
local xDirection = 1 --1 goes forward and -1 goes backward
local stuckTimer = 3 --Number of seconds to delay before retrying move


--Create harvest function
local function harvest()

  --Loop through all Y coordinates
  for y = yMinCoord, yMaxCoord, 1 do

    --Loop through all X coordinates at the current Y coordinate
    for x = xStart, xLimit, xDirection do

      --Till Dirt and Plant Seeds
      turtle.digDown()
      turtle.placeDown()

      --Determine where the turtle should go based on its direction
      if xDirection == 1 then

        --Make sure the turtle doesn't go past the max X coordinate
        if x < xMaxCoord then

          --Move the turtle forward 1 block

          while turtle.forward() == false do

            print("Get out of my way!")
            sleep(stuckTimer)

          end

          --Update the X coordinate variable
          xCoord = xCoord + xDirection

        else

          --Make sure the turtle doesn't go past the max Y coordinate
          if yCoord < yMaxCoord then

            --Move to the next row
            turtle.turnLeft()
            while turtle.forward() == false do

              print("Get out of my way!")
              sleep(stuckTimer)

            end
            turtle.turnLeft()

            -- Set "for" loop variables
              --for next row
              xStart = xMaxCoord
              xLimit = xMinCoord
              xDirection = -1

            end

        end

      else

        --Make sure the turtle doesn't go past the min X coordinate
        if x > xMinCoord then

          --Move the turtle forward 1 block
          while turtle.forward() == false do

            print("Get out of my way!")
            sleep(stuckTimer)

          end

          xCoord = xCoord + xDirection

        else

          --Make sure the turtle doesn't go past the max Y coordinate
            if yCoord < yMaxCoord then

            --Move to next row
            turtle.turnRight()
            while turtle.forward() == false do

              print("Get out of my way!")
              sleep(stuckTimer)

            end

            turtle.turnRight()

            -- Set "for" loop variables
                --for next row
              xStart = xMinCoord
              xLimit = xMaxCoord
              xDirection = 1

            end

        end

      end

    end

    --Update the X coordinate variable
    if y < yMaxCoord then

        yCoord = yCoord + 1

    end

  end

end



--Create return to storage function
local function returnToStorage()

  --Turn the turtle to face toward Y 0
  turtle.turnRight()

  --Move the turtle to Y 0
  for y = yCoord, yParkLocation, -1 do

    --Make sure the turtle doesn't go past the min Y coordinate
    if y > yMinCoord then

      --Move the turtle forward 1 block
      while turtle.forward() == false do

        print("Get out of my way!")
        sleep(stuckTimer)

      end

    end

  end

  --Turn the turtle to face toward X 0
  turtle.turnLeft()

  --Move the turtle to X -1
  for x = xCoord, xParkLocation, -1 do

     --Make sure the turtle doesn't go past the X park coordinate
    if x >= xParkLocation then

      --Move the turtle back 1 block
      while turtle.back() == false do

        print("Get out of my way!")
        sleep(stuckTimer)

      end


    end

  end

end


--Exit storage
while turtle.forward() == false do

  print("Get out of my way!")
  sleep(stuckTimer)

end

--Select seed slot
turtle.select(5)

--Harvest
harvest()

--Return to storage
returnToStorage()

--Write to the console window
print( "Harvest Complete" )