GauLogger V0.9

--      T   T   T
--
--      T   T   T
--  S>
--   W
--
-- > = turtle initial position
-- W = chest for placing wood
-- S = chest with saplings
-- T = tree spots

local sapling, wood = 1, 2
local left, right = 1, 2
local depth = 4 -- number of trees
local width = 4 -- number of trees, must be divisable by 2
local space = 3 -- distance between trees

function CheckFuel()
  print( "Current fuel level: " .. turtle.getFuelLevel() )

  if ( turtle.getFuelLevel() < 200 ) then
    print( "Need more fuel! ahhh~")
    local attempts = 0
    shell.run("refuel")
    while ( attempts < 10 and turtle.getFuelLevel() < 200 ) do
      attempts = attempts + 1
          os.sleep(10)
      if ( turtle.getFuelLevel() >= 200 ) then
        print( "Delicious~, fuel now at " .. turtle.getFuelLevel() )
        return
      end
    end
  end
end


function UnloadInventory()
  woodAmount = turtle.getItemCount(wood)
  if ( woodAmount < 1 ) then
    print( "No logs loaded, dofus! Saplings in slot 1, wood in slot 2!" )
    local attempts = 0
    while ( attempts < 10 and woodAmount < 1 ) do
      os.sleep(10)
      woodAmount = turtle.getItemCount(wood)
      attempts = attempts + 1
    end
    if ( woodAmount < 1 ) then
      print "Ah, I give up."
      os.exit()
      return
    end
  end
  if ( woodAmount == 1 ) then
    return
  end
  turtle.select(wood)
  turtle.drop( woodAmount - 1 )
  local slotNumber = wood + 1
  while ( slotNumber <= 16 and turtle.getItemCount(slotNumber) > 0 ) do
    turtle.select(slotNumber)
    turtle.drop()
    slotNumber = slotNumber + 1
  end

end

function LoadSaplings()
  if ( turtle.getItemCount(sapling) > 0 ) then
    return
  end
  turtle.select(sapling)
  turtle.suck()
end

function moveForward(spaces)
  local count = 0
  while ( count < space ) do
    if ( turtle.forward() == false ) then
      local tries = 0
      os.sleep(3)
      while ( tries < 10  and turtle.forward() == false ) do
        tries = tries + 1
        os.sleep(3)
      end
      if ( tries >= 10 ) then
        print("I've been blocked!")
        os.exit()
        return
      end
    end
    count = count + 1
  end
end

function Turn(direction)
  if ( direction == left ) then
    turtle.turnLeft()
  else
    turtle.turnRight()
  end
end

function AntiTurn(direction)
  if ( direction == right ) then
    turtle.turnLeft()
  else
    turtle.turnRight()
  end
end

function CutDownTree()
  turtle.dig()
  if ( turtle.forward() == false ) then
    print( "Failed to cut down tree" )
    os.exit()
    return
  end

  local height = 0
  while ( turtle.detectUp() ) do
    turtle.digUp()
    if ( turtle.up() == false ) then
      print ( "Failed to cut up tree" )
      os.exit()
      return
    end
    height = height + 1
  end

  while ( height > 0 ) do
   if ( turtle.down() == false ) then
     print ( "Failed to succumb to gravity's embrace" )
     os.exit()
     return
   end
   height = height - 1
  end

  if ( turtle.back() == false ) then
    print ( "BEEP BEEP BEEP!" )
    os.exit()
    return
  end
end

function CutRow(direction)
  moveForward(space)
  local count = 0
  while ( count < depth ) do
    Turn(direction)

    turtle.select(wood)
    if ( turtle.compare() == true ) then
      CutDownTree()
    end

    turtle.select(sapling)
    turtle.place()

    AntiTurn(direction)
    moveForward(space)

    count = count + 1
  end

end

function ChopAllTrees()
  local loops = width / 2
  local loopCount = 1
  while ( loopCount <= loops ) do
    CutRow(left)

    turtle.turnLeft()
    moveForward(space)
    turtle.turnLeft()

    CutRow(right)



    turtle.turnRight()
    moveForward(space)
    turtle.turnRight()

    loopCount = loopCount + 1
  end
end



function ReturnHome()
  turtle.turnRight()
--  local distanceToHome = ( space * ( width + 1 ) )
--  moveForward(distanceToHome)
  while ( turtle.detect() == false ) do
    turtle.forward()
  end
end


-- main loop

print("Running GauLogger!")

if ( turtle.detect() == false ) then
  turtle.turnRight()
end
UnloadInventory()
while true do
  CheckFuel()
  turtle.turnRight()
  LoadSaplings()
  turtle.turnLeft()
  turtle.turnLeft()
  ChopAllTrees()
  ReturnHome()
  UnloadInventory()
  os.sleep(600)
end