altar

function selectNext()
  if turtle.getSelectedSlot()==16 then
    turtle.select(1)
  else
    turtle.select(turtle.getSelectedSlot()+1)
    if turtle.getItemCount()==0 then
      selectNext()
    end
  end
end
function replace(n)
  for i=1,n do
    turtle.forward()
    if turtle.getItemCount()==0 then
      selectNext()
    end
    if not turtle.compareUp() then
      turtle.digUp()
      turtle.placeUp()
    end
  end
end
function forward(n)
  for i=1,n do
    turtle.forward()
  end
end
function back(n)
  for i=1,n do
    turtle.back()
  end
end
function up(n)
  for i=1,n do
    turtle.up()
  end
end
function down(n)
  for i=1,n do
    turtle.down()
  end
end

function doLayer(i)
  if i=="1" then
    if turtle.getFuelLevel()<12 then
      print("Refuel")
    else
      turtle.down()
      replace(3)
      turtle.turnRight()
      replace(2)
      turtle.turnRight()
      replace(2)
      turtle.turnRight()
      replace(1)
      turtle.forward()
      turtle.turnRight()
      turtle.back()
      turtle.up()
    end
  elseif i=="2" then
    if turtle.getFuelLevel()<30 then
      print("Refuel")
    else
      down(2)
      turtle.back()
      turtle.turnLeft()
      replace(1)
      turtle.forward()
      turtle.turnRight()
      replace(5)
      turtle.forward()
      turtle.turnRight()
      replace(5)
      turtle.forward()
      turtle.turnRight()
      replace(5)
      turtle.forward()
      turtle.turnRight()
      replace(4)
      turtle.turnRight()
      turtle.forward()
      up(2)
    end
  elseif i=="3" then
    if turtle.getFuelLevel()<52 then
      print("Refuel")
    else
      down(3)
      back(3)
      turtle.turnLeft()
      replace(2)
      forward(2)
      turtle.turnRight()
      turtle.forward()
      replace(7)
      forward(2)
      turtle.turnRight()
      turtle.forward()
      replace(7)
      forward(2)
      turtle.turnRight()
      turtle.forward()
      replace(7)
      forward(2)
      turtle.turnRight()
      turtle.forward()
      replace(5)
      turtle.turnRight()
      forward(3)
      up(3)
    end
  elseif i=="4" then
    if turtle.getFuelLevel()<84 then
      print("Refuel")
    else
      down(4)
      back(6)
      turtle.turnLeft()
      replace(5)
      forward(2)
      turtle.turnRight()
      turtle.forward()
      replace(13)
      forward(2)
      turtle.turnRight()
      turtle.forward()
      replace(13)
      forward(2)
      turtle.turnRight()
      turtle.forward()
      replace(13)
      forward(2)
      turtle.turnRight()
      turtle.forward()
      replace(8)
      turtle.turnRight()
      forward(6)
      up(4)
    end
  elseif i=="5" then
    if turtle.getFuelLevel()<116 then
      print("Refuel")
    else
      down(5)
      back(9)
      turtle.turnLeft()
      replace(8)
      forward(2)
      turtle.turnRight()
      turtle.forward()
      replace(19)
      forward(2)
      turtle.turnRight()
      turtle.forward()
      replace(19)
      forward(2)
      turtle.turnRight()
      turtle.forward()
      replace(19)
      forward(2)
      turtle.turnRight()
      turtle.forward()
      replace(11)
      turtle.turnRight()
      forward(9)
      up(5)
    end
  end
end

function getRune()
  test = turtle.getItemDetail()
  for i=1,#runes do
    if test.name..test.damage==runes[i].name..runes[i].damage then
      return runes[i].label
    end
  end
  return nil
end

function findRune(label)
  turtle.select(1)
  repeat
    turtle.select(turtle.getSelectedSlot()+1)
  until getRune()==label or turtle.getSelectedSlot==16
end

args = {...}
--load rune types
runes = {}
file = fs.open("runes","r")
i=0
while true do
  i=i+1
  temp1 = file.readLine()
  temp2 = file.readLine()
  temp3 = file.readLine()
  if temp1==nil then
    break
  else
    runes[i] = {label=temp1,name=temp2,damage=temp3}
  end
end
file.close()

homea = vector.new(505,239,645)
homeb = vector.new(527,239,645)
here = vector.new(gps.locate(5))
if args[3] then
  findRune(args[3])
end
if args[1]=="a" then
  if here==homeb then
    turtle.up()
    turtle.turnLeft()
    forward(22)
    turtle.turnRight()
    turtle.down()
    if args[2] then
      doLayer(args[2])
      turtle.up()
      turtle.turnRight()
      forward(22)
      turtle.turnLeft()
      turtle.down()
    end
  elseif here==homea then
    doLayer(args[2])
  else
    print("Out of position!")
  end
elseif args[1]=="b" then
  if here==homea then
    turtle.up()
    turtle.turnRight()
    forward(22)
    turtle.turnLeft()
    turtle.down()
    if args[2] then
      doLayer(args[2])
      turtle.up()
      turtle.turnLeft()
      forward(22)
      turtle.turnRight()
      turtle.down()
    end
  elseif here==homeb then
    doLayer(args[2])
  else
    print("Out of position!")
  end
elseif args[1]=="getrune" then
  print(getRune())
else
  print("Unrecognised command")
end