local depth=30
local bdepth=30
local currentDepth=0
local currentSide="blank"

function forward(num1)
	for i=1, num1 do
		turtle.forward()
	end
end

function toChest()
	local steps = 0
	turtle.turnLeft()
	turtle.turnLeft()
	forward(currentDepth+2)
	if currentSide == "Right" then
		turtle.turnLeft()
		while turtle.detect() == == true do
			turtle.forward()
			steps = steps + 1
		end
		for i=1, 15 do
			turtle.select(i)
			turtle.drop()
		end
		turtle.turnLeft()
		turtle.turnLeft()
		forward(steps)
		turtle.turnRight()
		while turtle.detect() == false do
			turtle.forward()
		end
	else
		turtle.turnRight()
		while turtle.detect() == == true do
			turtle.forward()
			steps = steps + 1
		end
		for i=1, 15 do
			turtle.select(i)
			turtle.drop()
		end
		turtle.turnLeft()
		turtle.turnLeft()
		forward(steps)
		turtle.turnLeft()
		while turtle.detect() == false do
			turtle.forward()
		end
	end
end

function getInv()
	local InvCount=0
	for i=1, 15	do
		InvCount= InvCount + turtle.getItemCount(i)
	end
	return InvCount
end

function checkFullInv(char1)
	if char1 == "dig" then
		Num1=getInv()
		turtle.dig()
		num2=getInv()
		if num1 == num2 then
			toChest()
		end
	else if char1 == "digup" then
		Num1=getInv()
		turtle.digUp()
		num2=getInv()
		if num1 == num2 then
			toChest()
		end
	else if char1 == "digdown" then
		Num1=getInv()
		turtle.digDown()
		num2=getInv()
		if num1 == num2 then
			toChest()
		end
	else
		print("invalid pass")
	end
end

---Turtle will clear one column of blocks
function column()
	while turtle.detect() == true do
		checkFullInv(dig)
		os.sleep(0.15)
	end b
	turtle.forward()
	while turtle.detectUp() == true do
		checkFullInv(digup)
		os.sleep(0.15)
	end
	checkFullInv(digdown)
end

function line(num1)
	for i=1, num1 do
		column()
		currentDepth= currentDepth + 1
	end
	currentDepth=0
end

---Turtle needs to create the primary shaft of the mine
---depth is defined by the user "Depth"
function shaft() ---Shaft is 3x3
	turtle.turnRight()
	turtle.forward()
	turtle.turnLeft()
	line(depth)
	turtle.turnLeft()
	column()
	turtle.turnLeft()
	line(depth-1)
	turtle.turnRight()
	column()
	turtle.turnRight()
	line(depth-1)
end

---function to return back to start location
---start location will be center of 3x3 on beginning face
function backtoShaftStart()
	turtle.turnRight()
	turtle.forward()
	turtle.turnRight()
	forward(depth-1)
	turtle.turnRight()
	turtle.turnRight()
end

---start branch mine, there will be shaft on each side of the path
---the branch itself will be 2 blocks on center (BXXB)
---depth of the branch will be defined by bdepth
function branch()
	---turtle needs to determine howmany branches to make
	branchcount= math.floor(depth / 3)
	---turtle to start on right side
	turtle.forward()
	turtle.turnRight()
	turtle.forward()
	currentSide="Right"
	for x=1, 2 do
		for i=1, branchcount do
			line(bdepth)
			turtle.turnLeft()
			turtle.turnLeft()
			forward(bdepth+1)
			if i < branchcount
				turtle.turnRight()
				forward(3)
				turtle.turnRight()
			end
		end
		turtle.turnLeft()
		turtle.turnLeft()
		currentSide="Left"
	end
	turtle.forward()
	turtle.turnLeft()
	turtle.back()
end
---initialize the program
---user input required for bdepth and depth

function Main()
	---Start with shaft
	shaft()
	backtoShaftStart()
	branch()
end

Main()