Wheat/Barley Farm

--[[
9 x 9 Farm Program for ComputerCraft Turtles.
by GooGoo on Pastebin.
Wade Catrett @ Youtube.
ThaWade every where else.

Caution: Be sure your wheat is fully grown before you start the program.
It has no way to check if the wheat is fully grown or not.
After the first harvest it waits 1 hour before harvesting again.
Gives status updates of 30, 10, 5, and 1 minutes and final of 30 seconds.
status updates = time until next harvest. Found at the very end of the code.

Put a minium of 3 seeds in slot 1 and 2
Put a minium of 2 coal in slot 16.

Note: this is for a 9x9 farm
D's are dirt/farmland.
W is water.
T = Turtle start position.
C = Chest
  D D D D D D D D D
  D D D D D D D D D
  D D D D D D D D D
  D D D D D D D D D
  D D D D W D D D D
  D D D D D D D D D
  D D D D D D D D D
  D D D D D D D D D
  D D D D D D D D D
  C C
  ^
 Turtle goes on top of the left chest               T C
 Right chest goes on the right side of the turtle.      C <-GROWN_WHEAT->
 After you place him on the left most chest         D D D D D D D D D
]]
--HARVEST ROW START--
local spot1 = turtle.getItemCount(1)
local spot2 = turtle.getItemCount(2)

function cropRow()
    turtle.select(1)
    turtle.forward()
    turtle.digDown()

    if spot1 > 1 then
        turtle.select(1)
        turtle.placeDown()
    elseif spot1 < 2 and spot2 > 1 then
        turtle.select(2)
        turtle.placeDown()
    elseif spot2 < 2 and spot1 > 1 then
        turtle.select(1)
        turtle.placeDown()
    else print("Not enough seeds to continue! Add atleast 3 seeds to slot 1 and 2.")
    end
end
--HARVEST ROW END--

--TURN RIGHT START--
function rightTurn()
    turtle.turnRight()
    turtle.select(2)
    turtle.forward()
    turtle.digDown()
    turtle.select(1)
    turtle.placeDown()
    turtle.turnRight()
end
--TURN RIGHT END--

--TURN LEFT START--
function leftTurn()
    turtle.turnLeft()
    turtle.select(2)
    turtle.forward()
    turtle.digDown()
    turtle.select(1)
    turtle.placeDown()
    turtle.turnLeft()
end
--TURN LEFT END--

--RETURN HOME START--
function returnHome()
    turtle.turnLeft()

    for i = 1, 8 do
        turtle.forward()
    end
    turtle.turnLeft()

    for i = 1, 9 do
    turtle.forward()
    end

    turtle.turnRight()
    turtle.turnRight()
end
--RETURN HOME END--

--REFUEL START--
function refuel()

        turtle.select(16)
        print("Selecting slot 16 for fuel check.")
        sleep(3)

    if turtle.getFuelLevel() < 100 and turtle.refuel(0) == true then
        print("Fuel level is " ..turtle.getFuelLevel().. " Need atleast 100 for a full harvest.")
        sleep(3)
        print("Refueling")
        sleep(3)
        turtle.refuel(2)
        print("Refueled")
    end

    if turtle.getFuelLevel() < 100 and turtle.refuel(0) == false then
        print("Fuel level is " ..turtle.getFuelLevel().. " Need atleast 100 for a full run.")
        sleep(3)
        print("Please add fuel to slot 16.")
        sleep(2)
        print("Waiting 10 seconds for fuel.")
        sleep(10)
        turtle.refuel(2)
    end

    if turtle.getFuelLevel() < 100 and turtle.refuel(2) == false then
        print("TIMES UP! Come back when you have fuel! Exiting Program!")
        sleep(2)
        exit()
        else print("Fuel level is " ..turtle.getFuelLevel().. " Starting Work!")
    end
end

--REFUEL END--

--COMPARE1&2 START--
function compareOneToTwo()

    if turtle.select(1) == false then
        turtle.select(1)
        print("selecting slot 1")
    end

    if turtle.compareTo(2) == true then
        print("Items match!")

        elseif turtle.compareTo(2) == false then
            turtle.select(1)
            turtle.dropDown()
            print("Getting rid of mismatch items")

        else
            print("ERROR")
    end
end
    --COMPARE1&2 END--


local seeds1 = turtle.getItemCount(1)
local seeds2 = turtle.getItemCount(2)
local firstSlot,lastSlot = 3,15
local firstSeed,lastSeed = 1,2
local excess1, excess2  = 3,4

--FILL SEEDS START--
function grabSeeds()

    for i=firstSeed,lastSeed do
        if seeds1 < 64 then
            turtle.select(firstSeed)
            turtle.suck()
            print("Filling slot 1 with seeds!")
        elseif seeds2 < 64 then
            turtle.select(lastSeed)
            turtle.suck()
            print("Filling slot 2 with seeds!")
        else
            print("I have plenty of seeds!")
        end
    end
end
--FILL SEEDS END--

--EMPTY INVENTORY START--
function emptyInventory()
    for i=firstSlot,lastSlot do
        if turtle.select(i) and turtle.compareTo(lastSeed) == true then
            turtle.drop()
            print("Emptying inventory 'seeds'!")
            elseif turtle.select(i) and turtle.compareTo(2) == false then
                turtle.dropDown()
                print("Getting rid of everything but seeds!")
        end
    end
end
--EMPTY INVENTORY END--

--EMPTY SEED OVERFLOW START--
function emptyExcessSeeds()
  print("Getting rid of seed overflow!")
    for i = excess1,excess2 do
        if turtle.select(i) and turtle.compareTo(firstSeed,lastSeed) == true then
        turtle.drop()
        end
    end
end
--EMPTY SEED OVERFLOW END--
--INVENTORY CLEANUP END--

while true do
    refuel()

    print("Harvesting row 1.")
    for i = 1, 9 do
        cropRow()
    end

    for i = 1, 1 do
        rightTurn()
    end

    print("Harvesting row 2.")
    for i = 1, 8 do
        cropRow()
    end

    for i = 1, 1 do
        leftTurn()
    end

    print("Harvesting row 3.")
    for i = 1, 8 do
        cropRow()
    end

    for i = 1, 1 do
        rightTurn()
    end

    print("Harvesting row 4.")
    for i = 1, 8 do
        cropRow()
    end

    for i = 1, 1 do
        leftTurn()
    end

    print("Harvesting row 5.")
    for i = 1, 8 do
        cropRow()
    end

    for i = 1, 1 do
        rightTurn()
    end

    print("Harvesting row 6.")
    for i = 1, 8 do
        cropRow()
    end

    for i = 1, 1 do
        leftTurn()
    end

    print("Harvesting row 7.")
    for i = 1, 8 do
        cropRow()
    end

    for i = 1, 1 do
        rightTurn()
    end

    print("Harvesting row 8.")
    for i = 1, 8 do
        cropRow()
    end

    for i = 1, 1 do
        leftTurn()
    end

    print("Harvesting row 9.")
    for i = 1, 8 do
        cropRow()
    end

    print("Returning Home")
    for i = 1, 1 do
        returnHome()
    end

    turtle.turnRight()

    while compareOneToTwo() do
    end

    while emptyInventory() do
        return true
    end

    while grabSeeds() do
        return true
    end

    while emptyExcessSeeds() do
        return true
    end

    turtle.turnLeft()
    --status message Start
    print("Next harvest in 1 hour!")
    print("Resting!")
    os.sleep(1800)

    print("30 minutes remaining!")
    os.sleep(1200)

    print("10 minutes remaining!")
    os.sleep(300)

    print("5 minutes remaining!")
    os.sleep(240)

    print("1 minute remaining!")
    os.sleep(30)

    print("harvesting in 30 seconds.")
    sleep(30)
    --Status message End
end