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----------------------
-- Efficient Quarry --
--  Made By Vilsol  -- 
--     1/20/2012    --
----------------------

term.clear()
term.setCursorPos(1, 1)

tArgs = { ... }
depth = 0
left = false

if(tArgs[1] == "update")then
	shell.run("rm", "eQuarry")
	shell.run("pastebin", "get", "PMfpn37Z", "eQuarry")
	print "Update successfull!"
	error()
end

function bringHome()
	turtle.digUp()
	turtle.select(13)
	turtle.placeUp()
	for slots = 1, 12 do
		turtle.select(slots)
		if(turtle.getItemCount(slots) > 0)then
			turtle.dropUp()
		end
    end
	turtle.select(13)
	turtle.digUp()
	turtle.select(1)
end

function isFull()
	slot = turtle.getItemCount(12)
	if(slot >= 1)then
		bringHome()
	end
end

function checkSlots()
	enderchest = turtle.getItemCount(13)
	dirt = turtle.getItemCount(14)
	stone = turtle.getItemCount(15)
	fuel = turtle.getItemCount(16)
	if(enderchest == 1 and dirt == 1 and stone == 1 and fuel >= 1)then
		return true
	else
		return false
	end
end

function checkFuel()
	if(turtle.getFuelLevel() < 100)then
		turtle.select(16)
		if (turtle.refuel())then
			print "Refueled successfully"
			return true
		else
			print "Out of fuel!"
			error()
		end
		turtle.select(1)
	else
		return true
	end
end

function safeDig()
	isFull()
	if(not turtle.dig())then
		if(not turtle.detect())then
			return true
		else
			if(turtle.attack())then
				for attack = 1, 50 do
					turtle.attack()
					if(turtle.dig())then
						dig = 1
						break
					end
					sleep(0.1)
				end
				if dig then
					dig = 0
					return true
				else
					print "Unknown problem!"
					error()
				end
			else
				print "Unknown problem!"
				error()
			end
		end
	else
		return true
	end
end

function safeForward()
	isFull()
	if(not turtle.forward())then
		sleep(1)
		if(turtle.attack())then
			for attack = 1, 50 do
				turtle.attack()
				if(turtle.forward())then
					forward = 1
					break
				end
				sleep(0.1)
			end
			if forward then
				forward = 0
				return true
			else
				print "Unknown problem!"
				error()
			end
		else
			if(turtle.dig())then
				sleep(1)
				for graveler = 1, 8 do
					if(not turtle.dig())then
						break
					end
					sleep(1)
				end
				if(turtle.forward())then
					return true
				else	
					print "Unknown problem!"
					error()
				end
			else
				print "Unknown problem!"
				error()
			end
		end
	else
		return true
	end
end

function compareOre()
	digup = 0
	digdown = 0
	turtle.select(14)
	if not turtle.compareUp() then
		digup = 1
	end
	if not turtle.compareDown() then
		digdown = 1
	end
	turtle.select(15)
	if not turtle.compareUp() then
		digup = digup + 1
	end
	if not turtle.compareDown() then
		digdown = digdown + 1
	end
	turtle.select(1)
	if(digup == 2)then turtle.digUp() end
	if(digdown == 2)then turtle.digDown() end
end

function turn()
	if left then
		left = false
		turtle.turnLeft()
		safeDig()
		safeForward()
		turtle.turnLeft()
	else
		left = true
		turtle.turnRight()
		safeDig()
		safeForward()
		turtle.turnRight()
	end
end

function checkLayer(x, z)
	for widthz = 1, z do
		for heightx = 1, x do
			compareOre()
			safeDig()
			safeForward()
		end
		compareOre()
		if tonumber(widthz) < tonumber(z) then
			turn()
		end
	end
	if left then
		turtle.turnRight()
		for back = 1, z-1 do
			safeForward()
		end
		turtle.turnRight()
	else
		turtle.turnLeft()
		for back = 1, z-1 do
			safeForward()
		end
		turtle.turnLeft()
		for back = 1, x do
			safeForward()
		end
		turtle.turnLeft()
		turtle.turnLeft()
	end
	left = false
end

function backUp()
	for up = 1, y do
		turtle.up()
	end
end

function digQuarry(x, z, y)
	while true do
		checkLayer(x, z)
		for down = 1, 3 do
			depth = depth + 1
			turtle.digDown()
			turtle.down()
		end
		if(depth >= y)then
			backUp()
			print "Done!"
			break
		end
	end
end

if(#tArgs < 3)then
	print "Usage: eQuarry x z y"
	error()
else
	x = tonumber(tArgs[1]) - 1
	z = tonumber(tArgs[2])
	y = tonumber(tArgs[3])
	if(tonumber(x) and tonumber(z) and tonumber(y))then
		if(true)then
			if(checkFuel())then
				print ("Digging a " .. x+1 .. "x" .. z .. "x" .. y .. " quarry!")
				digQuarry(x, z, y)
			else
				print "Something went very wrong!"
				error()
			end
		else
			print "Please fill in the slot as follows:"
			print "Slot 13: Enderchest for dumping items."
			print "Slot 14: Dirt"
			print "Slot 15: Stone"
			print "Slot 16: Fuel"
			error()
		end
	else
		print "Please use only numbers!"
		error()
	end
end