--[[===============CONFIGURATION VARIABLES=======]]--
--define void trash can for mod
trashcan = "cyclic:trash"

--define chest for storage
chest = "minecraft:chest"

--Low fuel level
lowFuel = 500

--Length of edge of square to dig (in blocks)
edgeLength = 4
--[[==============================================]]--

--[[===============MACHINE STATE==================]]--
--count the number of times the turtle has turned right (used to help turtle face forward
turnCount = 0

--count position in column
columnPostion = 0

--number of columns the turtle has dug
columnCount = 0

--count the the number layers down the turtle has dug
depthCounter = 0

--has the turtle hit bedrock?
foundBedrock = false
--[[==============================================]]--

term.clear()

function faceForward()
	for i = 1, 4 - turnCount do
		turtle.turnRight()
	end
	turnCount = 0
end

function buildJunkTable() --add all items in turtle's inventory to junk table
  junk_table = {}
  local index = 1
  local data = {}
	for i = 1, 16 do
	  turtle.select(i)
		if turtle.getItemCount(i) > 0 then
		  junk_table[index] = turtle.getItemDetail().name
		  index = index + 1
		end
	end
  turtle.select(1)

  for i,v in ipairs(junk_table) do
		print (v)
	end

end

function confirmReadiness() --look for chest and trashcan
	local chestFound = chestExsists()
	faceForward()
	local trashcanFound = trashcanExsists()
	faceForward()

	if (chestFound and not trashcanFound) then
	  print ("Chest found but not trash can, place down trashcan from cyclic mod adjacent to the turtle!")
	  return false
	else if (not chestFound and trashcanFound) then
	  print("No chest found but trashcan found! Place standard minecraft chest adjacent to turtle")
	  return false
	else  if (not chestFound and not trashcanFound) then
		print ("Place standard minecraft chest and cyclic mod trashcan adjacent to turtle")
		return false
	else
		print("Chest AND Trashcan found! Ready!")
		return true
	  end
	end
  end
end

function chestExsists() --find chest for depositing inventory

	local success, data = turtle.inspect()

	for i = 0, 3 do
		turnCount = i
		success, data = turtle.inspect()
		if (data.name == chest and i == 0) then
			print("Please do not place chest directly in front of turtle!")
			return false
		elseif data.name == chest then
			return true
		else
			turtle.turnRight()
		end
	end
	return false
end

function trashcanExsists() --find trashcan for garbage

	local success, data = turtle.inspect()
	for i = 0, 3 do
		turnCount = i
		success, data = turtle.inspect()
		if (data.name == trashcan and i == 0) then
			print("Please do not place trashcan directly in front of turtle!")
			return false
			elseif data.name == trashcan then
			return true
		else
			turtle.turnRight()
		end
	end
	return false
end

function deposit()
	if chestExsists() then
		for i = 1, 16 do
			turtle.select(i)
			turtle.drop()
		end

		turtle.select(1)
	else
		print("Chest missing!")
	end
end

function removeJunk()

	if trashcanExsists() then
	for i = 1, 16 do
	turtle.select(i)
		for index, value in pairs(junk_table) do								--This whole loop
			if turtle.getItemCount(i) > 0 then									--itterates through
				if value == turtle.getItemDetail(i).name then					--the values in the junk table
					turtle.drop()												--compares them to the item names
				end																--in the turtle's inventory and
			else																--deletes them if they match
				break
			end
		end
	end
	turtle.select(1)
	else
		print("Trashcan missing!")
	return
	end
end

function digColumn()

	for columnPostion, edgeLength - 1 do
		if not turtle.forward() then
			turtle.dig()
			turtle.forward()
		end
	end
end

function orient()
	if columnCount % 2 == 0 then
		turnCount = turnCount + 1
		turtle.turnRight()
		if turtle.detect() then
			turtle.dig()
			turtle.forward()
			turnCount = turnCount + 1
			turtle.turnRight()
		else
			turtle.forward()
			turnCount = turnCount + 1
			turtle.turnRight()
		end
	else
		turnCount = turnCount - 1
		turtle.turnLeft()
		if turtle.detect() then
			turtle.dig()
			turtle.forward()
			turnCount = turnCount - 1
			turtle.turnLeft()
		else
			turtle.forward()
			turnCount = turnCount - 1
			turtle.turnLeft()
		end
	end
	--columnCount = columnCount + 1
end

function isInvetoryFull()

  for i = 1,16 do
	if turtle.getItemCount(i) == 0 then
		return false
		end
	end
  return true

end

function digLayer()

	for columnCount, (edgeLength - 1) do
		digColumn()
		orient()
	end
	digColumn()

	turtle.turnRight()

	for i = 1, edgeLength do
		turtle.forward()
	end
	turtle.turnRight()
	turnCount = 0
	columnCount = 0
	columnPostion = 0
	print ("Depth cout:" .. depthCounter)

end

function goHome()
	local oldTurnCount = turnCount

	for i = 1,depthCounter do
		turtle.up()
	end

	faceForward()
	turtle.turnLeft()
	turnCount = turnCount + 3

	for i=1,columnCount do
		turle.forward()
	end

	turtle.turnLeft()
	turnCount = turnCount - 1

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

	turnCount = oldTurnCount
end


print("Current fuel level: "..turtle.getFuelLevel().."/"..turtle.getFuelLimit())
if turtle.getFuelLevel() <= lowFuel then
  print("Please add more fuel")
end


if confirmReadiness() then
	buildJunkTable()
	deposit()
	faceForward()
else
	return
end

repeat
	digLayer()
	if not turtle.down() then
		turtle.digDown()
		turtle.down()
	end
	depthCounter = depthCounter + 1
until isInvetoryFull() == true
goHome()