OmegaQuarry

local state = "unknown"
--[[
States:
  home      --> Can go to chests, mining, setup
  chests    --> Can go to mining, returning, home
  mining    --> Can go to returning
  returning --> Can go to chests,home
  setup     --> Can go to home
  unknown   --> Can go to returning
]]
local lastKnownCoords = {0,0,0}
local homeCoords = {0,0,0}
local data = {}
local saveLocation = "save.dat"

local function copy(a,b)
  assert(type(a) == "table","copy: first input is not a table.")
  for k,v in pairs(a) do
    if type(v) == "table" then
      b[k] = {}
      copy(a[k],b[k])
    else
      b[k] = v
    end
  end
end

local function saveData()
  data.State = state
  data.Coords = {}
  data.homeCoords = {}
  copy(homeCoords,data.homeCoords)
  copy(lastKnownCoords,data.Coords)
  local h = fs.open("savedata","w")
  if h then
    h.write(textutils.serialize(data))
    h.close()
  end
end

local function loadData()
  if not fs.exists("savedata") then
    state = "setup"
    saveData()
    return false,0
  else
    local h = fs.open(saveLocation,"r")
    if h then
      local dat = textutils.unserialize(h.readAll())
      h.close()
      if dat then

      else
        state = "setup"
        saveData()
        return false,1
      end
    else
      state = "setup"
      saveData()
      return false,2
    end
  end
end



--Determine the state by checking the immediate surroundings
--If unable to determine, return "unknown"
--How unknown is to be handled: ping reciever, get location, attempt to return home, if fail: stop, ping reciever, sleep
local function determineState()
  for i = 1,4 do
    local a,block = turtle.inspect()
    if a then
      if block.name:find("chest") then
        turtle.turnLeft()
        turtle.forward()
        turtle.turnRight()
        return "home"
      end
      if block.name == "minecraft:cobblestone" then
        return "returning"
      end
    end
    turtle.turnLeft()
  end
  local a,block = turtle.inspectUp()
  if a then
    if block.name == "minecraft:cobblestone" then
      return "returning"
    end
  end
  return "unknown"
end





if data == {} then loadData() end




local function main()
  if
  while true do
    --TODO: Handle states

  end
end


main()